Labor & Engenho v.9, n.4, p.76-89, out./dez. 2015.
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Historicalanalysesofdebris1lowdisasteroccurrencesandoftheirscienti1icinvestigationinBrazil
DOSSIERDASÁGUAS:GESTÃODOPATRIMÔNIOHÍDRICO
MasatoKobiyamaProfessor.InstituteofHydraulicResearch,FederalUniversityofRioGrandedoSul.PortoAlegre[RS]Brazil.<[email protected]>.GeanPauloMichelSanitaryandenvironmentalengineer.PhDstudentofWaterResourcesandEnvironmentalSanitation.InstituteofHydraulicResearch,FederalUniversityofRioGrandedoSul.PortoAlegre[RS]Brazil.<[email protected]>.ElisieleCardozoEngsterUndergraduatestudentofGeography.InstituteofHydraulicResearch,FederalUniversityofRioGrandedoSul.PortoAlegre[RS]Brazil.<[email protected]>.MaurícioAndradesPaixãoUndergraduatestudentofEnvironmentalEngineering.InstituteofHydraulicResearch,FederalUniversityofRioGrandedoSul.PortoAlegre[RS]Brazil.<[email protected]>.
AbstractConsideringthedebrisflowashighly-destructiveflowofwaterandsedimentmixtureinawaywhereitisagravity-governedcontinuousflow,thepresentpaperconductedaWebsurveyoftechnical-scientificstudiesthattreatedthesephenomenawhichoccurredinBrazilduringtheperiod1900-2014.Althoughtheincreaseof occurrence from the 1990s caused the increase in the number of publication, there are still a smallnumber of publications, especially in scientific journals. A historical analysis about Brazilian studiesdemonstratesanactualsituationinBrazilandconfirmsvariousnecessaryandurgentactions.Amongthem,themoreimportantactionsare:(1)establishmentofterminologyandconceptaboutdebrisflowinBrazil;(2) systematization of hydrometeorological monitoring and topographic survey; (3) registration ofoccurrencesanddata-baseconstruction;and(4)developmentofwoodydebrisflowresearches.
KeywordsDebrisclow,scienticicresearches,history.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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1.Introduction
Debris flows have been increasingly causing serious damages to the human society and theenvironment in theworld includingBrazil. This fact indicates the importance of developingmorescientific researches to understand the mechanisms of such natural phenomena and thecountermeasures required to reduce related disasters. In these circumstances, the InternationalConferenceonDebris-FlowHazardsMitigation:Mechanics,PredictionandAssessmentwasheldinSanFrancisco(USA)in1997,Taipei(Taiwan)in2000,Davos(Switzerland)in2003,Chengdu(China)in2007,Padova(Italy) in2011,andTsukuba(Japan) in2015.Asimilareventcalled InternationalConferenceonMonitoring,Simulation,PreventionandRemediationofDenseandDebrisFlowwasconductedfourtimes:inRhodes(Greece)in2006,NewForest(England)in2008,Milano(Italy)in2010andDubrovnik(Croatia)in2012.
Previously,scientistswhodevotedthemselvestothestudyofdebrisclowshadnoopportunitytoseethisaliveandrealphenomenondirectly.Thustheinformationwasdrawnthroughtestimonyfromafewwitnessesandobservationsofthedepositionareaofthedebrisclowafteritoccurs.Itmeans that, in fact, scientists could just imaginehow the clowdeveloped.Okuda et al. (1977)showed for the cirst time theworld a cilm of a debris clow,which signicicantly facilitated theunderstandingofitsmechanisms.Inthissense,thecontributionofOkuda'sworkandhisgroupwasdeextremeimportance.
Theworkentitled"Debrisflows"ofTakahashi(1991),publishedintheseriesofmonographsoftheInternationalAssociationofHydraulicEngineeringandResearch–IAHR,wasthefirstbookwrittenintheworldthatexclusivelyaddressedthisphenomenonsystematicallyandwasamajorstimulusto scientific community. Today there aremany books dealing only with this phenomenon (e.g.,MICHIUE&ARMANINI,1997;JACOB&HUNGR,2005;TAKAHASHI,2007),aswellasreviewarticles(INNES, 1983; DAVIES et al., 1992; HUTTER et al., 1996; COUSSOT&MEUNIER, 1996; IVERSON,1997;IVERSONetal.,1997;HUNGRetal.,2001;VANDINE&BOVIS,2002;TAKAHASHI,2009).
Analyzingdisastersrelatedtolandslides,Petley(2012)andSepúlveda&Petley(2015)showedatrendwhere countrieswith a large number of scienticic papers treating landslides suffer lessfrom thesedisasters. It implies thatBrazilian society alsoneeds to go further in their studiesaboutdebrisclowsinordertoreducethedisasterscausedbythem.
Therefore,theobjectiveofthepresentstudywastoinvestigatetheconceptofdebrisflowandtoperformahistoricalandquantitativeresearchontechnicalandscientificpapersdealingwiththisphenomenoninBrazil.AccordingtoAlexander(1989),thedebrisflowisthemostdestructivetypeamongallthetypesofmassmovements,andisresponsibleformoredeathsintheurbanarea.ThiscommentisprobablystilltrueinBrazilandintheworld.
2.Terminologyandconcepts
Takahashi(2007)definedthedebrisflowas“aflowofsedimentandwatermixtureinamannerasifitwasa flowof continuous fluiddrivenbygravity”, andcommented that suchaphenomenonhasgreat mobility. According Iverson (2004), the debris flow is a transitional phenomenon of massmovementwhosecharacteristicswerealternatedbetweenslippingandflooding.Coussot&Meunier(1996)consideredthat thedebris flowisan intermediatephenomenonamonghyperconcentratedflow and landslide. Precisely because of its transitional or intermediate characteristics, there arevariousdefinitionsandconsequentlyinaccuracies.
Owingtotheflowandtransitionnature,severalstudieshavesoughttodifferentiatebetweendebrisflows and other similar ones. For example, Costa (1988) attempted to differentiate debris flows,hyper-concentratedflowsandfloods.Imaizumietal.(2008)differentiatedlandslideanddebrisflow.Ofany form, thereareseveralattempts toestablishconceptsrelated to thisphenomenon.Table1showssomeexamples.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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Table1.Differentconceptstodecinethedebrisclows.
Thedebrisflowisverycommoninmountains.Consequentlythereareseveralwordstocallit.InJapan,peoplecallitja-nukewhichisanimageoflargesnakedestructingvalley,doseki-ryumeaningsoil-rock flow, yama-tsunami meaning mountainous tsunami, and so on. In Brazil, the termscorrespondingtodebrisflowarediverse,consistingofacombinationoftermswhichreplacetheword flow (fluxo/corrida/movimento/torrente) and theword debris (detritos/escombros/massa),i.e.,fluxodedetrito,fluxodeescombros,corridademassa,amongothers.Thuseveninonecountrytherearediverseterminologies.
Indeed, it is necessary todiscuss the characteristics of the flowingmaterial, i.e., debris.Hungr et al.(2001)defineddebrisaslooseandnon-uniformmaterialwithlowplasticity.Texturally,thedebrisisamixtureofsand,pebbles,bouldersandsilt.Frequently,thedebriscancontainorganicmaterialssuchastrunks,branches,amongothers.AccordingtoCruden&Varnes(1996),therearetwotypesofmaterialsthatconstituteflows:debrisandland.Thedebrisissoilcontainingstonesandothercoarseparticlesizesinahigherproportionthan20%,whilethelandswouldconsistofthisproportionlessthan20%.
Asdebris flowisaphenomenoncausingdisasters, itcanbehandledfromthepointofviewofnaturaldisastersandprotection/civildefense.In2008,theEmergencyDisasterDataBase(EM-DAT)oftheCentreforResearchontheEpidemiologyofDisasters(CRED)whichisthepartneragencyoftheWorldHealthOrganizationreclassifiedthedisasterstypesintotwomajorgroups:naturalandtechnological(SCHEURENet al., 2008).Naturaldisastersweredivided into six sub-groups: biological, geophysical, climatological,hydrological,meteorological and extraterrestrial (meteorites), and these, in turn, into twelve subtypes.Thisnewclassificationwastheresultofaninitiativebetweenthetwomaindisasterdatabases,theCREDandtheMunichReinsuranceCompany(MunichRe),whichdecidedtoadoptacommonclassificationfortheirrespectivedatabases(BELOWetal.,2009).
Themainchangewastheseparationofthemassmovementsintotwotypes:dryandwet.Thefirstisassociatedonly togeophysicalevents (earthquakesanderuptions)and thesecond tohydrological
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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Authors Concepts
Varnes(1978) Flowistherapidmovementofviscousmaterial.Therearedebrisclow,mudclowandrocksavalanche,dependinguponthenatureofthematerialinvolvedinthemovement.
Costa(1988)Thedebrisflowisavisco-plastic,non-Newtonianfluidordilatantfluidinlaminarmanner,withuniformprofileofsedimentconcentration.Thesedimentconcentrationvariesfrom70to90%byweight(47to77%byvolume).Theshearstressisgreaterthan400dyn/cm2.
Jan&Shen(1997)Debrisclowsisagravityclowofmaterialcomposingamixtureofsoil,rock,waterand/orair,comingfromlandslidewithlargeamountofrunoff.Theirpropertiesvaryaccordingtotheamountofwaterandclay,thesedimentsizeanditsdistribution.
USGS(1997)Debrisclowsarefast-movinglandslideswhichoccurinvariouspartsoftheworld.Theyareparticularlydangeroustolifeandproperty,becausetheyabruptlymoveanddestroyobjectsontheirpath,andoftenoccurwithoutwarning.
Vandine&Bovis(2002)Thedebrisclowisatypeofmassmovement,whichinvolvestherapidmovementoforganicandinorganicmaterials(predominantlycoarsematerial),saturatedwithwaterandalongconcinedandslopingchannel.
Imaizumietal.(2008) Massmovementsaredividedintotwotypes:slopesandchannels.Themovementsofslopesandchannelsareconsideredlandslidesanddebrisclows,respectively.
IRDR(2014) Thedebrisclowisatypeofslipthatoccurswhenheavyraincausesthedescentofalargeamountofdebris(woods,rocks,mud,etc.)onslopesbytheactionofgravitationalforce.
Hungretal.(2014)
Thedebrisclowisaverydangerousphenomenoninmountainousregions.Thisphenomenonisdifferentfromtheothertypesoflandslidesbecauseofthefactofperiodicoccurrencesthoughtheestablishedtrajectorieswhicharenormallygullyandcirstorsecond-orderbasins.
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conditions (rainfall and water-table). Regardless of origin, such mass movements are commonlycalled landslides.TheUN-InternationalStrategy forDisasterReduction(UNISDR)alsoadoptedthenew classification, since the EM-DAT is the primary database used by the UN, as noted in UNDP(2004).Moreover,asubsequentupdatingoftheclassificationusedbyCREDwasperformed,whichuse no longer the disaster extraterrestrial (GUHA-SAPIR et al., 2012). Thus, Table 2 shows thesummaryofformerandcurrentnaturaldisasters´classificationsestablishedbytheCREDandtheUN.Inthisclassification,thedebrisflowisapartofthe(wet)massmovements,whichindicatesthatthedebrisflowisconsideredonetypeofhydrologicaldisastersbyUN.
Table2.FormerandcurrentratingsofnaturaldisastersinCRED—UN.
Recently,Brazil(2012)launchedtheLaw12608/12establishingtheNationalPolicyofProtectionandCivilDefense(PNPDEC).AsaresultofBrazilianhistory,duetoalotoflossesassociatedwithnaturaldisasters,the PNPDEC shows several aspects, quotes, and intentions that relate to water resources and theirmanagement.AsVenderuscolo&Kobiyama(2007)pointedout,theinterfacesbetweenthePNPDECandtheNationalPolicyofWaterResources (PNRH)whichwasestablishedbyLawNo.9433/97 (BRAZIL,1997)shouldbeanalyzedinmoredetail.
ForabetterexplanationofsomeaspectsofPNPDEC,MinistryofNationalIntegration(2012)publishedtheNormativeInstructionNo.01.InthisInstruction,thereareseveralfragmentsofthetextwherethefederalgovernmentexpressesthewaytoconducttheBrazilianclassificationofnaturaldisasters:
“Art.7ºTheProtectionandCivilDefenseSecretarywilladopttheEM-DAT/CREDclassificationofdisastersandcorrespondentsymbology”.“Art.8ºForattendingtheclassificationofEM-DATtheProtectionandCivilDefenseSecretarystartstoadopttheBrazilianClassificationandCodingofDisasters–COBRADE,asshownonAttachmentIofthisNormativeInstruction.“ATTACHMENTI–BRAZILIANCLASSIFICATIONANDCODINGOFDISASTERS(COBRADE)[…] To suit the Brazilian classification to the classification used by the United Nationsrepresents the follow up of international developments in classification of disasters andrepresentsthelevelingofBraziltotheotherdisastermanagementagenciesallaroundtheworld.FurthermoretheclassificationadoptedbytheUnitedNationsissimplerthanDisastersCoding(CODAR)currentlyusedbySINDEC”.
Fromthethreeexpressionsmentionedabove, it isclearthatthefederalgovernmentintendedtomake the Brazilian classification and coding (COBRADE) very similar to the internationalclassificationusedbytheUN,althoughtheBrazilianclassificationismoredetailed.However,itcanbeclearlyobservedthattheCOBRADEdoesnotfollowthechangeofclassificationperformedbyCRED,andalmostmaintainstheoldstyleclassification(Table3).
As mentioned above, in the international classification, the debris flow corresponds to a type oflandslidesthatfallsintothecategoryofwetmassmovements,whichinturnbelongstothehydrologicaldisasterclass.Ontheotherhand,intheBrazilianClassificationandCodingofDisaster(COBRADE),itbelongs to the category of geological disasters that includes the mass movements that, in turn,encompasslandslides,debrisflows,andsoon.Thesedebrisflowsaredividedintotwotypes:soil/mud
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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Formerclassi1ication Currentclassi1ication Maintypes
Geological Geophysical Earthquakes,volcanoes,massmovements(dry)
Meteorological Storms
Hydrometeorological Hydrological Floods,massmovements(wet)
Climatological Extremetemperatures,droughts,cires
Biological Biological Epidemics,pests,insectinfestations
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androck/debriswhosecodesare1.1.3.3.1and1.1.3.3.2inCOBRADE,respectively.Thus,itcanbesaidthattheBrazilianclassificationdoesnotmatchtheinternationalclassificationinrelationtodebrisflows.Sincethisphenomenonisakindofwetmassmovement,debrisflowsshouldbeclassifiedashydrologicaldisastersbyrespectingtheArt.7ofPNPDEC.HereitisworthrememberingthatKobiyamaetal.(2010a)showedthatamongalltypesofnaturaldisasters,hydrologicaldisasters(floods+ landslides)arethoseleadtothemajorproblemsinBrazilandintheworld.
Table3.ComparisonbetweenBrazilianandinternationalclassificationsofnaturaldisasters.
Regardingtothephenomenonitself,tothetypeofflowingmaterial,tothedisastercategoryassociatedwiththisphenomenon,amongothers,thereisawidevarietyoftermsandconcepts.Brunsden(1979)commentedthattheterminologyandclassificationofdebrisflowsarenotsatisfactory.Aliteraturereviewconductedbythepresentstudyshowsthatthisproblemstillremainsinthescientificcommunity.Addingtothecomplexityanddifficultyinidentifyingthephenomena,theabsenceofadministrativeagreementmakestheinvestigationsurveyinaliteraturemorecostlyandcomplicated.
Basedonalltheaboveexamples,thepresentstudyusesthetechnicalterm"debrisflow"anddefinesit as a flowing phenomenon that occurs from the landslide initiation. Due to the fluidity of themixture,itsrunoutisoftenverylong.However,thepresentstudydoesnotdiscussindetailthisvalue.
3.Materialsandmethods
ConsideringthediversityofPortugueseterms(Zluxodedetritos,Zluxosdeescombros,corridasdemassa,escorregamentos,deslizamento,etc.), thepresentstudysearchedthedatabasesavailableon the Internet and in libraries, undergraduate´s monographs, master´s theses, and doctor´sdissertationsproducedinBrazilianuniversities.Bytryingtocollectthelargestpossiblenumberof papers dealingwith debris clows in Portuguese and English, papers published in scienticicmeetingsandjournalsaswellasinternationalandnationalbooksinthecieldofgeosciencesandengineeringweresought.
Theinformationcontainedineachpaper(forexample,thephenomenondescriptionandphotos)wasalsousedtojudgewhethertheworkingtopicwasreallyrelatedtodebrisclow.Forexample,
BrazilianClassi1ication(COBRADE) InternationalClassi1ication
Class Example Class Example
Geological
• Earthquakes• Volcanism• MassMovements• Erosion
Geophysical• Earthquake• Volcanism• MassMovements(dry)
Meteorological • Large-scalesystems• Storms• Extremetemperatures
Meteorological • Storms
Hydrological • Floods• Flashcloods• Waterloggings
Hydrological • Floods• Massmovements(wet)
Climatological• Drought Climatological
• Extremetemperatures• Dry/drought• Fires
Biologic • Epidemics• Infestations/pests Biologic
• Epidemics• Insectinfestations• Stampedesofanimals
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if one paper addressed only translational landslides, it was not considered as a publicationrelatedtodebrisclows,andwasexcludedfromthecinalanalysisinthepresentstudy.
4.Resultsanddiscussion
4.1.Oldrecord
Schlumberger(1882,citedTAKAHASHI,1983)wroteoneofthefirstreportsaboutdebrisflowsintheworldliterature.SeekingfortheoldBrazilianliterature,anaccountofthepriestAnchietadescribinghisexperienceinPiratininga,SãoPaulostate,in1560wasfound(CORRÊAFILHO,1954):
[…] It fell so violently that seemed to threaten us with the Lord destruction; shook thehouse,snatchedtheroofsandoverthrewthewoods;thecolossaltalltreesrippedupbytheroots,brokeintoothersmallerpieces,smashedother,sothattheroadswereblocked,andtherewasnopassagethroughthewoods, itwastowonderhowmanydamagetreesandhousesproducedinhalfanhour.[…](CORRÊAFILHO,1954).
It isnotedthatthisreportprobablydescribestheoccurrenceofanextremely-intensiverainfalleventanda seriesofdebris clows (ormud clow).Therefore, this canbe considered theoldestrecordrelatedtothisphenomenoninBrazil.Afterhim,severalpeoplerecordeddebrisclowsinmoreorlessscienticicways.
4.2.Historicalanalysis
InthesurveyconductedbysearchingtheInternetandinlibraries,162workspublishedduringtheperiod1949-2014weretotallyfound.ThedetaildescriptionofallthepublicationsisinKobiyama&Michel(2015).Althoughtheresearchedperiodextendsfromthebeginningofthetwentiethcentury,no technical-scientific report was elaborated by 1949. It was noted that many Brazilian works,directlyorindirectly,adoptedaclassificationofVarnes(1978).Figure1showsthenumberofworksdivided into four categories: books; papers in journals; papers in proceedings; and monographs(theses,dissertationsandtechnicalreports).Mostofpublicationsarepapersinproceedings,whichimplies a limited quality of scientific production related to this phenomenon in Brazil. The smallnumberofscientificbookshascausedthedifficultyinherenttothestudyofthisphenomenon.
Figure 2 shows the historical trend of scientific studies during the period from 1900 to 2014.Althoughvariouspublicationshavebeenmadeintheperiod1966-1975,inthe1990sasignificantincreaseinpublicationsbegan.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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26
98
29
9
Book & Book chapterPapers in JournalsPapers in ProceedingsMonographs
Figure1.istributionofpublicationsofscienticicpapersondebrisclowinBrazilduringthe1900-2014period.
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Figure2.ThescienticicworkhistoryondebrisclowsinBrazilinthe1900-2014period.
AnalyzingMarcelinoetal.(2006)andTominagaetal.(2009),amongothers,thepresentstudysoughtinformationonoccurrencesofdebrisflowsinBrazilduringtheperiod1900-2014.ItcanbesaidthattheoldestdisastercausedbydebrisflowinBrazil,technicallyregistered,tookplaceinSantosin1928,causing 80 deaths and partial destruction of the Santa Casa hospital. Nevertheless, the scientificcommunity did not investigate this disaster. Table 4 shows that during the period 1966-1975disastersrelatedtolargedebrisflowoccurred.Inaddition,fromthe1990s,debrisflowsthatcausedlargenumbersoffatalitiesoccurredmoreoften.AcomparisonofFigure2withTable4confirmsthatthenumberofpublicationshasbeenelevatedwiththeincreaseoftheoccurrenceofdebrisflows.
Table4.DisasterwithdebrisclowsinBrazil(1900-2014).
Year Location Numberofdeaths(approximate)
1928 Santos(SP) 80
1948 ValedoParaíba(SP/RJ) 250
1956 Santos(SP) 64
1966 RiodeJaneiro(RJ) 100
1967 SerradasAraras(RJ) 1700
1967 Caraguatatuba(SP) 120
1971 Salvador(BA) 104
1972 CamposdoJordão(SP) 10
1974 Tubarão(SC) 40
1986 Lavrinhas(SP) 11
1988 Cubatão(SP) 10
1988 Petrópolis(RJ) 171
1988 RiodeJaneiro(RJ) 30
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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Nu
mb
er o
f P
ub
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ion
s
0
5
9
14
18
Year
1900
1905
1910
1915
1920
1925
1930
1935
1940
1945
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005
2010
2015
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ModicicationfromMarcelino(2003)andRosaFilho&Cortez(2008).
4.3.SuggestionsfornecessaryactionsinBrazil
ThehistoricalanalysisofstudiesondebrisflowsinBrazildemonstratesthecurrentsituationandbrings several actions that should be urgently implemented. Based on the fact that studies ondebris flows may be relevant in understanding the mechanism of sediment production andmanagement of debris-flow disasters, the present study suggests (1) establishment of standardconceptandterminology;(2)systematizationofhydro-meteorologicalmonitoringandtopographysurveying;(3)registrationoftheoccurrencesanddatabaseconstruction;and(4)developmentofresearchonwoodydebrisflows.
4.3.1.Establishmentofstandardconceptandterminology
Asabovementioned,peopleinBrazilusethevarioustermsfordebrisflows,forexamples,fluxodedetrito,fluxodeescombros,corridademassa,andsoon.ThoughtheProtectionandCivilDefenseinBraziluses the termcorridademassa in theCOBRADE, this termdoesnot seempopular in thescientific community. Furthermore, in terms of disaster, this phenomenon is classified ashydrologicalbyCRED(international)andasgeologicalbyCOBRADE(nationallevel).Thus,existsadivergenceinterminologyandconceptrelatedtothisphenomenon.
Sincedebrisflowshaveatransitionalandfluiditycharacteristics,subjectivityliesonitsdefinition,identificationanddescriptioneven in thescientific community.Toreduce thesubjectivity in theidentification of these phenomena, some criterions could be used. For example, Wilford et al.(2004) considered the debris flow, debris flood and flood as hydrogeomorphic processes andproposedaquantitativemethodtodifferentiatethembymorphometry.This typeofquantitativemethodologyshouldbeincreasinglysoughtandusedinBrazilinordertoimprovetheregistrationmethodology.SincetheenvironmentinBrazilischaracterizedwithhightemperature,rainfallandbiodiversity,debrisflowsinBrazilmaydifferfromthoseoutsideofBrazil,especiallyinEuropeandNorthAmerica. TheBrazilian scientific community should, hence, discussmore to establish thestandardterminologyandconcept.
4.3.2.Systematizationofhydro-meteorologicalmonitoringandtopographysurveying
It is commonly said thatheavy rainfalls can causedebris flows (ZNAMENSKY,2014).Therefore, therainfallnecessarytotriggerdebrisflows(forexample,SUZUKIetal.,1979;SUZUKI&KOBASHI,1981;SUZUKI&KOBASHI,1987;GLADE&WIECZOREK,2005)andlandslides(e.g.,TATIZANAetal.,1987;MICHELetal.,2015)isoneofthemainissuescurrentlyaddressedinscienceandtechnologydedicatedtodisastermanagement.Debris flowsalmostalwaysoccurwithheavyrainfalls.Due to this fact, theCREDreviseditsclassificationofnaturaldisasters,insertingdebrisflowsinthecategoryofhydrologicaldisasters.Sohydrologicalmonitoring,especiallyofrain,shouldbeevenmoreintensifiedinBrazil.
1989 Salvador(BA) 100
1990 Blumenau(SC) 14
1992 Contagem(MG) 36
1995 TimbédoSul(SC) 29
2001 Petrópolis(RJ) 51
2008 ValedoItajaí(SC) 135
2010 AnguladosReis(RJ) 30
2011 SerraFluminense(RJ) 978
2013 Petrópolis(RJ) 33
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Toadvancefurther,itisnecessarytoimplementanautomaticmonitoringsystemofrainfallanddischarge. Since debris clows are phenomena that occur abruptly, especially in mountainousregions, this system should be implementedmore intensively in the headwaters regions andpreferablyshouldhavehightemporalintensivedatacollection(measurementintervalsequalto10minutesorshorter).
Thesedimentproductionassociatedwithadebriscloweventistypicallyhigh,whichcanclearlybeobservedinthecield.However,recognitionofamorequantitativeperspectiveofeventsisstillfarfromsatisfactorycondition.Itisduetothelackoftopographicalinformationbeforeandaftertheevent.Then,thesteeperregionswhichexhibitagreatertendencytotheoccurrenceofdebrisclows should be topographically described with greater precision and frequency. In addition,conductingsurveys in the initiationzones, transportanddepositionofnewlyoccurringdebrisclowscanprovideimportantinformationinadvanceofstudiesthataddressthephenomenon.
4.3.3.Registrationoftheoccurrencesanddatabaseconstruction
A science or a scientific study of one phenomenon almost always starts from its observations.Therefore, toadvance thescienceofdebris flows, therecordofall the instances, regardlessof theeventthathavecausedadisaster,isfundamental.Thereareseveralequationsestablishedonlyfromdatabaseswhich containedoccurrences records, forexample, theequation that relates the runoutangletothetotalvolumeofproducedsediments(COROMINAS,1996;RICKENMANN,1999).SinceanequationthatdescribestheBraziliansituationhadnotyetbeenelaborated,Kobiyamaetal.(2010b)compared their resultswithphenomena thatoccurred inEurope,usingone figureofRickenmann(2005).ToverifythesimilaritybetweenBrazilianandEuropeansituationsandtogenerateitsownequationdescribingBraziliandebris flows, it is imperative that a database containingdebris flowoccurrencesrecordsiscreatedandfullyavailabletoallinterestedsectors.
In the preparation of records and database construction, it is necessary that certainminimumstandardsarehighlighted.Thereare, ingeneral,suggestionsandmanuals for landslidesrecords,forexample,handbookorguidanceofHighland&Bobrowsky(2008)andCorominasetal.(2014).However,adetailedmanualtorecordtheoccurrenceofdebrisflowhasnotelaboratedyet.Rainfallregime, topographic information and occurrence time are the fundamental characteristics to berecorded.Furthermore,ifpossible,pedological,geological,sedimentological,rheological,hydraulic,andotherhydrologicalcharacteristicsshouldbealsoregistered.
4.3.4.Developmentofresearchonwoodydebris1lows
Normally,debrisflowshaveamixtureoftwophases(waterandsediment).Inthecaseofamountainousregioncoveredbyforest,thetrunksrepresenttheirsignificantpresence.However,theeffectsoftrunks(orvegetationingeneral)ontheoccurrencemechanismsofdebrisflowsarenotrecognizedscientificallyinasatisfactoryway(LANCASTERetal.2003;STOFFEL&WILFORD,2013).Althoughthereareseveralattemptstomodelthewoodydynamics intheflows(WALLERSTEIN,2003;MAZZORANAetal.,2011;SHRESTHAetal.,2012),nomodelisstillcapabletodoitverysatisfactorily.
For the temperate climate condition, Seo et al. (2010) conducted a literature review on thedynamicsofthelogsattheriverbasinlevel.Theirdescriptionwasjustqualitative.InBrazilthetropical and subtropical climates facilitate the increase both in the biodiversity and in thebiomassinthebasins,especiallyinriparianzones.Sincetheriparianvegetationisveryrich,thepresenceofvegetationandlogscanbeexceptionallysignicicantforthedebrisclowoccurrences.Itmeansthat,whenadebrisclowoccursinBrazil,itcanbecategorizedasawoodydebrisclow.Thus,studiesinBrazilshouldfocusonthedynamicsofthelogsinthefullcontextofdebrisclow.
5.Finalconsiderations
DebrisflowsdonotoccurfrequentlyinBrazil.However,whentheyoccur,theyarecapabletocauselargelossesandfatalities.Inordertoreducedisastersassociatedwithdebrisflows,severalmeasures
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arerequired.Amongthem,theregistrationanddescriptionofsuchphenomenonatthemomentoftheir occurrence as well as education/training prior to its occurrence should be emphasized. Topromoteeducationrelatedtodebrisflows,teachingmaterialswhichinturndependontheexistenceof records are indispensable. Because such phenomena usually occur in mountainous regions,ordinary citizens need to receive a good education on this topic for registering them moreappropriate and detail. Goerl et al. (2012) reported that the debris flowmay be one of themainobjectsofhydrogeomorphicstudy.Hence,thisscienceshouldbemorewidespreadatalllevelsofeducationinBrazilandshouldadvancetheunderstandingofthisphenomenon.
Duetothehighspeedandhugeextension,thedebrisflowisconsideredanimportantgeomorphicagent.Itsoccurrencecanbeasourceoflargeamountsofsedimenttotherivernetwork(GABET&DUNNE,2003).AccordingBendaetal.(2003),thedebrisflowchangesthefluvialmorphologyandaffects aquatic ecology. Along the large period, this phenomenon significantly contributes to thesedimentsproductionandconsequentlythelandscapeevolutionofsteepbasins(STOCK&DIETRICH,2003).Therefore,fromatechnicalpointofview(disastermanagement,soilandwaterconservation,etc.)andfromascientificpointofview(hydrology,geomorphology,andhydrogeomorphology),itisstronglyrequiredtoincreasethenumberofstudiesandpublicationsrelatedtodebrisflowsinordertopopularizeandeducatethisphenomenoninthecommunity.
5.1.Acknowledgements
The authors thank themembers of the Research Group on Natural Disasters (GPDEN) of theInstituteofHydraulicResearch(IPH)oftheFederalUniversityofRioGrandedoSul(UFRGS)fordaily discussion of debris clow and also Brazilian National Council of Research (CNPq) forprovidingscholarships.
6.References
ALEXANDER,D.Urbanlandslides.ProgressinPhysicalGeography,v.13,p.157-191,1989.
ARMANINI,A.;MICHIUE,M.(Eds.)RecentDevelopmentsonDebrisFlows.Berlin:Springer-Verlag,1997.226p.
BELOW,R.;WIRTZ,A.;GUHA-SAPIR,D.DisasterCategory—Classi1icationandperilTerminologyforOperationalPurposes.Brussels:CRED/Munich:MunichReFoundation,2009.19p.
BENDA,L.;MILLER,D.;BIGELOW,P.;ANDRAS,K.Effectsofpostwildcireerosiononchannelenvironments,BoiseRiver,Idaho.ForestEcologyandManagement,v.178,p.105-119,2003.
BRASILLeino.9433,de08de janeirode1997. InstituiaPolíticaNacionaldeRecursosHídricos,criaoSistemaNacionaldeGerenciamentodeRecursosHídricos.Brasília:Brasil,1997.Disponívelem<http://www.aneel.gov.br/cedoc/blei19979433.pdf>.Acessoem02deoutubrode2012.
BRASILLeino.12.608,de10deabrilde2012. InstituiaPolíticaNacionaldeProteçãodeDefesaCivil.Brasília:Brasil,2012.Disponívelem<http://www.planalto.gov.br/ccivil_03/_Ato2011-2014/2012/Lei/L12608.htm>.Acessoem02denovembrode2012.
BRUNSDEN, D. Mass movements. In: EMBLETON, C.; THORNES, J. (eds.) Process in geomorphology,London:EdwardArnold,1979.p.130-86.
COROMINAS, J. The angle of reach as a mobility index for small and large landslides. CanadianGeotechnicalJournal,v.33,n.2,p.260-271,1996.
COROMINAS,J.;VANWESTEN,C.;FRATTINI,P.;CASCINI,L.;MALET,J.-P.;FOTOPOULOU,S.;CATANI,F.;VANDENEECKHAUT,M.;MAVROULI,O.;AGLIARDI,F.;PITILAKIS,K.;WINTER,M.G.;PASTOR,M.;FERLISI,S.;TOFANI,V.;HERVÁS, J.;SMITH, J.T.Recommendations for thequantitativeanalysisof landsliderisk.BullEng.Geol.Environ.,v.73,p.209-263,2014.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
85
Labor & Engenho v.9, n.4, p.76-89, out./dez. 2015.
L&E ISSN 2176-8846
CORRÊAFILHO,V.P.JosédeAnchieta.RevistaBrasileiradeGeogra1ia,v.XVI,n.2,p.229-233,1954.
COSTA,J.E.Rheologic,geomorphic,andsedimentologicdifferentiationofwatercloods,hyperconcentratedclows,anddebris clows. In:BAKER,V.R.;KOCHEL,R.C.;PATTON,P.C. (eds.)Floodgeomorphology,NewYork:John-Wiley&Sons,1988.p.113-122.
COUSSOT,P.;MEUNIER,M.Recognition,classicicationandmechanicaldescriptionofdebrisFlows.Earth-ScienceReviews,v.40,p.209-227,1996.
CRUDEN, D.M.; VARNES, D.J. Landslide types and processes. In: TURNER, A.K.; SCHUSTER, R.L. (eds.)Landslides investigation and mitigation, Washington: Transportation research board, US NationalResearchCouncil,1996.p.36–75.(SpecialReport247).
DAVIES,T.R.;PHILLIPS,C.J.;PEARCE,A.J.;ZHANG,X.B.Debris clowbehaviour—an integratedoverview.IAHSPubl.,v.209,p.217-225,1992.
GABET,E.J.;DUNNE,T.Astochasticsedimentsupplymodel forasteepMediterranean landscape.WaterResourcesResearch,v.39,n.9,p.1237,2003.doi:10.1029/2003WRR002341.
GOERL,R.F.;KOBIYAMA,M.;SANTOS,I.Hidrogeomorfologia:Princípios,Conceitos,ProcessoseAplicações.RevistaBrasileiradeGeomorfologia,v.13,n.2,p.103-111.2012.
GUHA-SAPIR, D.; VAS, F.; BELOW, R.; PONSERRE, S. Annual Disaster Statistical Review 2011: Thenumbersandtrends.Brussels:CRED,2012.42p.
HIGHLAND, L.M.; BOBROWSKY, P.The landslidehandbook—A guide tounderstanding landslides.Reston:U.S.GeologicalSurvey,2008.129p.(Circular1325).
HUNGR,O.;EVANS,S.G.;BOVIS,M.;HUTCHINGSON,J.N.Reviewoftheclassicicationoflandslidesoftheclowtype.EnvironmentalandEngineeringGeoscience,v.7,p.221-238.2001.
HUNGR,O.;LEROUEIL,S.;PICARELLI,L.TheVarnesclassificationoflandslidetypes,anupdate.Landslides,v.11,p.167-194,2014.
HUTTER, K.; SVENDSEN, B.; RICKENMANN, D. Debris clowmodeling: A review.ContinuumMechanicsandThermodynamics,v.8,p.1-35,1996.
IMAIZUMI,F.;SIDLE,R.;KAMEI,R.()EffectsofforestharvestingontheoccurrenceoflandslidesanddebrisclowsinsteepterrainofcentralJapan.EarthSurfaceProcessesandLandforms,v.33,p.827–840,2008.
INNES,J.L.Debrisclow.ProgressinPhysicalGeography,v.7,p.469-501,1983.
IRDR — Integrated Research on Disaster Risk. Peril Classi1ication and Hazard Glossary. Beijing:IntegratedResearchonDisasterRisk,2014.24p.(IRDRDATAPublicationNo.1).
IVERSON,R.M.Thephysicsofdebrisclows.ReviewsofGeophysics,v.35,p.245-296,1997.
IVERSON,R.M.Debrisclow.In:GOUDIE,A.S.(ed.),EncyclopediaofGeomorphology,London:Routledge,2004.p.225.
IVERSON, R.M.; REID,M.E.; LAHUSEN, R.G. Debris-clowmobilization from landslides.Annu. Rev. EarthPlanet.Sci.v.25,p.85–138,1997.
JACOB, M.; HUNGR, O. (eds.) Debris-1low hazards and related phenomena. Berlin: Springer-Verlag,2005.739p.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
86
Labor & Engenho v.9, n.4, p.76-89, out./dez. 2015.
L&E ISSN 2176-8846
JAN,C.D.; SHEN,H.W.ReviewDynamicModelingofDebrisFlows. In:ARMANINI,A.;MICHIUE,M. (eds.)RecentDevelopmentsonDebrisFlows.Berlin:Springer-Verlag,1997.p.93-116.
KOBASHI,S.;SUZUKI,M.Thecriticalrainfall(dangerindex)fordisasterscausedbydebrisclowsandslopefailures.IAHSPubl.v.165,p.201-211,1987.
KOBIYAMA,M.;MICHEL,G.P.Bibliogra1iadostrabalhosde1luxosdedetritosocorridosnoBrasilnoperíodo de 1949-2014: Atualização. Porto Alegre: GPDEN/IPH/UFRGS, 2015. 16p. (Trabalho TécnicoGPDEN.No.02).
KOBIYAMA,M.;CHAFFE,P.L.B.;GOERL,R.F.;GIGLIO,J.N.;REGINATTO,G.M.P.Hydrologicaldisastersreduction:lessonsfromhydrology.In:SENS,M.L.;MONDARDO,R.I.(eds.)ScienceandTechnologyforEnvironmentalStudies: Experiences fromBrazil, Portugal andGermany, Florianópolis: Federal University of SantaCatarina,2010a.p.49-72.
KOBIYAMA,M.;GOERL,R.F.;CORREA,G.P.;MICHEL,G.P.DebrisflowoccurrencesinRiodosCedros,SouthernBrazil: meteorological and geomorphic aspects. In: WRACHIEN, D.; BREBBIA, C.A. (eds.)Monitoring,Simulation,PreventionandRemediationofDenseDebrisFlowsIII,Southampton:WITpress,2010b.p.77-88.
LANCASTER, S.T.; HAYES, S.K.; GRANT, G.E. Effects of wood on debris clow runout in small mountainwatersheds.WaterResourcesResearch,v.39,n.6,2003.doi:10.1029/2001WR001227.
MARCELINO,E.V.MapeamentodeáreassusceptíveisaescorregamentosnomunicípiodeCaraguatatuba(SP)usandotécnicasdesensoriamentoremotoeSIG.SãoJosédosCampos:INPE,2003.228p.(DissertaçãodeMestradoemSensoriamentoRemoto).
MARCELINO, E.V.; NUNES, L.H.; KOBIYAMA,M. Banco de dados de desastres naturais: análise de dadosglobaiseregionais.CaminhosdeGeogra1ia,v.6,n.19,p.130-149,2006.
MAZZORANA,B.;HÜBL,J.;ZISCHG,A.;LARGIADER,A.Modellingwoodymaterialtransportanddepositioninalpinerivers.NaturalHazards,v.56,p.425-449,2011.
MICHEL, G.P.; GOERL,R.F.; KOBIYAMA, M. Critical rainfall to trigger landslides in Cunha River basin,southernBrazil.NaturalHazards,v.75,p.2369-2384,2015.DOI10.1007/s11069-014-1435-6.
MINISTÉRIO DA INEGRAÇÃO NACIONAL Instrução normativa No. 01, de 24 de agosto de 2012.Brasília:Brasil,2012.DiárioOcicialdaUnião169e170.
OKUDA,S.;SUWA,H.;OKUNISHI,K.;NAKANO,K.;YOKOYAMA,K.Syntheticobservationondebrisflow.Part3.ObservationatvalleyKamikamihorizawaofMt.Yakedakein1976.AnnualsDPRIv.20B-1,p.237-263,1977.
PETLEY,D.N.Landslidesandengineeredslopes:protectingsociety through improvedunderstanding. In:EBERHARDT, E.; FROESE, C.; TURNER, A.K.; LEROUEIL, S. (eds.) Landslides and engineered slopes,London:CRCPress,2012.p.3-13.
RICKENMANN,D.Empiricalrelationshipsfordebrisclows.NaturalHazards,v.19,n.1,p.47-77,1999.
RICKENMANN,D.RunoutPredictionMethods.In:JACOB,M.;HUNGR,O.(eds.)Debris-1lowhazardsandrelatedphenomena,Berlin:Springer-Verlag,2005.p.305-324.
ROSA FILHO, A.; CORTEZ, A.T.C. Os deslizamentos de encostas nas favelas em áreas de risco da “suíçabrasileira”:CamposdoJordão(SP).In:1°SIMPGEO/SP,RioClaro,Anais,2008.p.587-595.
SCHEUREN, J-M.;WAROUX, O.P.; BELOW, R.; GUHA-SAPIR, D.Annual Disaster Statistical Review: theNumbersandTrends2007.Brussels:CRED/Munich:MunichReFoundation,2008.47p.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
87
Labor & Engenho v.9, n.4, p.76-89, out./dez. 2015.
L&E ISSN 2176-8846
SCHLUMBERGER. Über den Muhrgangam 13 August 1876 im Wildbache von Fauconbei Barcelonnte(Niederalpen).In:DEMONZY,P.(org.)StudienüberdieArbeitenderGebirge,1882.p.289-299.
SEO, J.I.; NAKAMURA, F.; CHUN, K.W. Dynamics of largewood at thewatershed scale: a perspective oncurrentresearchlimitsandfuturedirections.LandscapeEcologicalEngineering,v.6,p.271–287,2010.
SEPÚLVEDA,S.A.;PETLEY,D.N.RegionaltrendsandcontrollingfactorsoffatallandslidesinLatinAmericaandtheCaribbean.NaturalHazardsandEarthSystemSciences,v.15,p.1821-1833,2015.
SHRESTHA, B.B.; NAKAGAWA, H.; KAWAIKE, K.; BABA, Y.; ZHANG, H. Driftwood deposition from debrisclowsatslit-checkdamsandfans.NaturalHazards,v.61,p.577–602,2012.
STOCK, J.; DIETRICH,W.E. Valley incision by debris clows: evidence of a topographic signature.WaterResourcesResearch,v.39,n.4,1089,2003.doi:10.1029/2001WR001057.
STOFFEL,M.;WILFORD, D. Hydrogeomorphic processes and vegetation: disturbance, process histories,dependenciesandinteractions.EarthSurfaceProcessesandLandforms,v.37,p.9-22,2012.
SUZUKI,M.;KOBASHI, S.Thecritical rainfall for thedisastersby slope failures. J. JSCEC, n.121,p.16-26,1981.
SUZUKI,M.;FUKUSHIMA,Y.;TAKEI,A.;KOBASHI,S.Thecriticalrainfallforthedisasterscausedbydebrismovement.J.JSCEC,n.110,p.1-7,1979.
TAKAHASHI, T. Debris clow. In: ASHIDA, K.; TAKAHASHI, T.;MICHIUE,M. (org.) Sediment disasters inriverandtheircountermeasures.Tokyo:MorikitaShuppan,1983.p.55-149.
TAKAHASHI,T.Debris1low.Rotterdam:Balkema,1991.165p.(MonographofIAHR).
TAKAHASHI,T.DebrisFlowSMechanics,PredictionandCountermeasures.Leiden:Taylor&Francis/Balkema,2007.448p.
TAKAHASHI, T. A review of Japanese debris clow research. International Journal of Erosion ControlEngineering,v.2,n.1,p.1-14,2009.
TATIZANA,C.;OGURA,A.T.;CERRI,L.E.S.;ROCHA,M.C.M.AnálisedecorrelaçãoentrechuvaseescorregamentosnaSerradoMar,municípiodeCubatão.In:VCongressoBrasileirodeGeologiadeEngenharia,SãoPaulo,Anais,v.2,1987.p.225-236.
TOMINAGA, L.K.; SANTORO, J.; AMARAL, R. (orgs.)Desastres naturais: conhecer para prevenir. SãoPaulo:InstitutoGeológico,2009.196p.
UNDPReducingdisasterrisk:achallengefordevelopment.NewYork:UNDP,2004.130p.
USGSDebrisFlowHazardsinUnitedStates.Denver:USGSNationalLandslideInformationCenter,1997.4p.Acessoemhttp://pubs.usgs.gov/fs/fs-176-97/fs-176-97.pdfem10/10/2014.
VANDINE, D.F.; BOVIS, M. History and Goals of Canadian Debris Flow Research, A Review. NaturalHazards,v.26,p.69-82,2002.
VARNES,D.J. Slopemovement types and processes. In: SCHUSTER, R.L.; KRIZEK, R.J. (eds.)Landslides,analysisandcontrol.Washington:Transportationresearchboard/NationalAcademyofSciences,1978.p.11-33.(Specialreport176).VENDRUSCOLO, S.; KOBIYAMA,M. Interfaces entre a PolíticaNacional deRecursosHídricos e a PolíticaNacionaldeDefesaCivil, comrelaçãoaosdesastreshidrológicos,noBrasil. In: Jornadas Internacionalessobre Gestión Del Riesgo de Inundaciones y Deslizamientos de Laderas. São Carlos: USP/EESC/NIBH,Anais,2007.22p.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
88
Labor & Engenho v.9, n.4, p.76-89, out./dez. 2015.
L&E ISSN 2176-8846
WALLERSTEIN,N.P.Dynamicmodelforconstrictionscourcausedbylargewoodydebris.EarthSurfaceProcessesandLandforms,v.28,p.49–68,2003.
WIECZOREK,G.F.;GLADE,T.Climaticfactorsincluencingoccurrenceofdebrisclows.In:JACOB,M.;HUNGR,O(eds.)Debris-1lowhazardsandrelatedphenomena.Berlin:Springer-Verlag,2005.p.325-362.
WILFORD,D.J.;SAKALS,M.E.; INNES, J.L.;SIDLE,R.C.;BERGERUD,W.A.Recognitionofdebris clow,debriscloodandcloodhazardthroughwatershedmorphometrics.Landslides,v.1,p.61-66,2004.
ZNAMENSKY,D.DebrisandmudclowinitiationprocessesinBraziliantropicalandsubtrocpicalhumidandmountainous environments. In: LACERDA, W.A.; PALMEIRA, E.M.; COELHO NETTO, A.L.; EHRLICH, M.(eds.)Extremerainfallinducedlandslides:aninternationalperspective,SãoPaulo:OcicinadeTextos,2014.p.103-127.
KOBIYAMA,M.;MICHEL,G.P.;ENGSTER,E.C.;PAIXÃO,M.A.HistoricalanalysesofdebrisclowdisasteroccurrencesandoftheirscientificinvestigationinBrazil.Labor&Engenho,Campinas[SP]Brasil,v.9,n.4,p.76-89,out./dez.2015.http://www.conpadre.org
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