Evaluation of an Ecosystem Service for Avoided-Reservoir-Sedimentation and Its Economic Value

In China the current approaches to evaluating the efficacy of the ecosystem service for avoided-reservoir-sedimentation cannot identify the supplier and beneficiary. In addition, the use of the same whole-country coefficient of sediment delivery for different areas can lead to inaccurate results. Ba...

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Bibliographic Details
Main Authors: Wu Nan, Gao Ji-Xi, Ennaanay, D., Mendoza, G.F., Sudebilige, Luo Zun-Lan, Li Dai-Qing
Format: Conference Proceeding
Language:English
Subjects:
avoided-reservoir-sedimentation
economic value
Ecosystems
Environmental economics
Environmental factors
Equations
Ertan reservoir
Geographic Information Systems
Reservoirs
Rivers
sediment delivery ratio
sediment yield
Sediments
Software packages
Soil
soil erosion
watershed
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Summary:In China the current approaches to evaluating the efficacy of the ecosystem service for avoided-reservoir-sedimentation cannot identify the supplier and beneficiary. In addition, the use of the same whole-country coefficient of sediment delivery for different areas can lead to inaccurate results. Based on the integrated geographic information system (GIS) software package, ArcGIS9.2, a new model was established to simulate this ecosystem service and its economic value. The model included fabricating the watershed of the study reservoir. The sediment delivery ratio (SDR) and the universal soil loss equation (USLE) were used to simulate the spatial patterns of the annual sediment yield and sediment retention in watershed. The economic value in this model of the ecosystem service was determined for a fixed number of years. Taking the Ertan reservoir as an example, the results showed that the actual sediment yield was 629.3times10 4 tldra -1 in the watershed. It occupied 12.7% of the actual soil erosion volume. Farmland was the most important source of sediment yield. Its actual sediment yield occupied 62.9% of the total. The region with a higher quantity of sediment yield and sediment retention was around the reservoir. The contribution ratio of the forest to the avoided-reservoir-sedimentation service value was higher than those of the other contributors on a per unit area basis. For the reservoirpsilas designed operating life, the total value of this service in the watershed was 27529.2times10 8 Yuan.
DOI:10.1109/ESIAT.2009.256