Application of the ASSETS eutrophication assessment methodology to four contrasting Chinese coastal systems. Sanggou Bay. Huangdun Bay. ASLO Summer Meeting 2005, Santiago de Compostela Session SS72: Assessing and Modelling Eutrophication June 22 nd 2005. http://www.eutro.org. - PowerPoint PPT Presentation
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Application of the ASSETS Application of the ASSETS eutrophication assessment eutrophication assessment methodology to four contrasting methodology to four contrasting Chinese coastal systems Chinese coastal systems ASLO Summer Meeting 2005, Santiago de Compostela ASLO Summer Meeting 2005, Santiago de Compostela Session SS72: Assessing and Modelling Session SS72: Assessing and Modelling Eutrophication Eutrophication June 22 June 22 nd nd 2005 2005 http://www.eutro.org S.B. Bricker, R. Callender, G.C. Matlock NOAA J.G. Ferreira, A.M. Nobre IMAR X.L. Zhang, M.Y. Zhu, B. WangFirst Institute of Oceanography X. Yan Ningbo University Sanggou Bay Huangdun Bay
Transcript
Application of the ASSETS eutrophication Application of the ASSETS eutrophication assessment methodology to four assessment methodology to four
contrasting Chinese coastal systemscontrasting Chinese coastal systems
ASLO Summer Meeting 2005, Santiago de CompostelaASLO Summer Meeting 2005, Santiago de CompostelaSession SS72: Assessing and Modelling EutrophicationSession SS72: Assessing and Modelling Eutrophication
June 22June 22ndnd 2005 2005
http://www.eutro.org
S.B. Bricker, R. Callender, G.C. Matlock NOAAJ.G. Ferreira, A.M. Nobre IMARX.L. Zhang, M.Y. Zhu, B. Wang First Institute of OceanographyX. Yan Ningbo University
Sanggou Bay Huangdun Bay
China – General study areaChina – General study area
ASSETS was applied to four very different coastal systems in China
Span 8 degrees of Span 8 degrees of latitude (latitude (~~900km);900km);
Include estuaries Include estuaries and coastal bays; and coastal bays;
Vary in size and Vary in size and human use;human use;
From sparsely From sparsely populated to populated to heavily populated;heavily populated;
Location of the four systemsLocation of the four systems
Sanggou Wan
Jiaozhou Wan
Changjiang estuary
Huangdun Wan
Area Volume Depth Type Catchment population
(km2) (106 m3) (m) (X 106)
140 1000 7.5 Coastal 0.200bay
390 1900 7 Coastal 4.9bay
51000 637500 8 Estuary 400
90 1125 8 Estuary ?
Bohai Sea
Yellow Sea
East China Sea
Scallop
Kelp
Scallop & Kelp
Sanggou Bay, showing aquaculture areas Sanggou Bay, showing aquaculture areas
Aquaculture areas:Aquaculture areas:
OystersOysters 391 ha391 ha
ScallopScallop 3400 ha3400 ha
KelpKelp 4400 ha4400 ha
Jiaozhou BayJiaozhou Bay
LandIntertidal
0 m
40 m
Changjiang EstuaryChangjiang Estuary
120 121 122 123 124 12528
29
30
31
32
33
Shanghai
HangzhouLati
tud
e (
N)
L ongitude ( E )o
o
Xuliujing
EA
ST
C
HIN
A
S
EA
Huangdun BayHuangdun Bay
注 水文站 潮位站
12
9
5 2
钱仓
梅山
西沪港口
象
山
1110
8
6
4
3
1
强蛟码头
7
六横
岛
港
The Problem – The Assessment ApproachThe Problem – The Assessment Approach
High algal productionHigh algal productionLoss of water clarity Epiphyte problems
Macroalgal problemsMacroalgal problems
Fish kills Loss of habitat
Human health risksLoss of tourism
Closed fishing grounds
Loss of SAVLoss of SAVLow D.OLow D.O
Nuisance/Toxic bloomsNuisance/Toxic blooms
IncreasedN and P concentration
Symptoms and Consequences of Nutrient EnrichmentNutrient Inputs Primary Secondary Consequences and Processing Impacts Impacts of Symptoms
P: Overall Human Influence (OHI) – Natural processing + Human Nutrient LoadS: Overall Eutrophic Condition (OEC) – Condition of waterbodyR: Determination of Future Outlook (DFO) – What will happen in the future?
ASSETS: Pressure - State - ResponseASSETS: Pressure - State - Response
http://www.eutro.org
Sanggou BaySanggou Bay – – ASSETSASSETS Application Application
Indices
Overall Human Influence (OHI)
ASSETS: 5
Overall Eutrophic Condition (OEC)
ASSETS: 5
Determination of Future Outlook (DFO)
ASSETS: 3
Methods
Susceptibility
Nutrient inputs
Primary
Secondary
Future nutrient pressures
Parameters Rating Level of expression
Dilution potential HIgh Lowsusceptibility
Flushing potential Moderate
Moderate
Chlorophyll a Low
LowMacroalgae No Problem
Dissolved Oxygen No Problem
Submerged Aquatic No Problem Vegetation Low
Nuisance and Toxic No ProblemBlooms
Future nutrient pressures remain the same
Index
LOW
LOW
NO CHANGE
ASSETS: HIGH
Cultivation of scallops, oysters, kelp – high summer
bivalve mortality from disease
Population (X 103) 200Nutrient loading (tN y-1) 800Mean depth (m) 7.5Mean tidal range (m) 1.5Water residence time (d) 20
Estuary Characteristics: Main issues and impacts:
Jiaozhou BayJiaozhou Bay – – ASSETSASSETS Application Application
Other influences Aquaculture Aquaculture, sewage, Sewage, industry, Aquacultureshipping, recreation shipping
Management: GEF/UNEP Yellow Sea Large Marine Ecosystem (www.yslme.org), China Blue Sea Action Plan, Total Load Control Plan (in development), particularly hotspots (ie Changjiang)
ASSETS has been successfully applied to four Chinese systemsASSETS has been successfully applied to four Chinese systems The Changjiang (Yangtze) is the most impacted and also the most The Changjiang (Yangtze) is the most impacted and also the most
populated watershed. Management plans include the populated watershed. Management plans include the GEF/UNEP GEF/UNEP Yellow Sea Large Marine Ecosystem, China Blue Sea Action Plan, Yellow Sea Large Marine Ecosystem, China Blue Sea Action Plan, and the Total Load Control Plan which addresses hotspotsand the Total Load Control Plan which addresses hotspots
Despite multiple uses, Jiaozhou Bay has a low impact and is Despite multiple uses, Jiaozhou Bay has a low impact and is expected to improve from sewage treatment implementation expected to improve from sewage treatment implementation /upgrades. Shellfish aquaculture may play a pivotal role in reducing /upgrades. Shellfish aquaculture may play a pivotal role in reducing the concentration of particulate organic material;the concentration of particulate organic material;
Opportunistic macroalgae are considered a problem in the US and Opportunistic macroalgae are considered a problem in the US and EU - but in China, algae such as EU - but in China, algae such as EnteromorphaEnteromorpha are cultured for are cultured for harvest, so the ASSETS criteria must be adapted to local harvest, so the ASSETS criteria must be adapted to local considerations;considerations;
HABs are a major problem both in parts of the Yellow Sea and in the HABs are a major problem both in parts of the Yellow Sea and in the East China Sea, and lower the ASSETS scores for some systems. As East China Sea, and lower the ASSETS scores for some systems. As in other parts of the world, it is unclear what (if any) management in other parts of the world, it is unclear what (if any) management measures may be taken to correct this.measures may be taken to correct this.
