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Imbuhan Airtanah(AT-6019)
Kompilasi
Prodi Magister TeknikAirtanah, FITB, ITB
Recharge vs. Discharge Area
►Recharge area : portion of the drainage basin in which the net saturated flow of groundwater is directed away from the water table
►Discharge area : portion of drainage basin in which the net saturated flow of groundwater is directed toward the water table
Freeze and Cherry, 1979
Water Flow Paths
Recharge vs. Discharge Area
►Recharge area : water table usually lies at some depth
►Discharge area : water table usually at or very near the surface
Freeze and Cherry, 1979
Recharge vs. Discharge Area
AE
DTopography
Water table
B C
Sumber : Hubbert (1940)
Kawasan Resapan
Kawasan Resapan
Bukan kawasan Resapan
AkiferLapisan kedap
Apakah semua puncak topografi adalah daerah resapan?
Groundwater Dating Method
AGEYoung
Groundwater
(0 – 60 yr)
Old Groundwater
(60 – 50,000 yr)
Very OldGroundwater
( > 50,000 yr)
METHOD
Tritium Silicon-32 Krypton-81
3H/3He Argon-39 Chloride-36
Helium-4 Carbon-14 Helium-4
Krypton-85 Indirect Methods Argon-40
CFCs 18O-2H Iodine-129
SF6
Inert and Active elements
Uranium Disequilibrium Series
36Cl/Cl
18O-2H(Kazemi et al., 2006)
(J.Toth, 1999)
Aliran RegionalIntermediateAliran Lokal
daerah discharge
daerah pedesaan
daerah discharge
?
Toth Model (1969) for Undulating Water Table
Local, intermediate, regional flow systems
Stagnation points – junction of flow systems
Intermediate – have at least one local flow system within
Relief and depth to length ratios affect flow system