Modelling soil erosion and hydropower linkages of Rantambe reservoir, Sri Lanka: towards payments for ecosystem services
| Autor: | Prasanthi Gunawardena, E. P. N. Udayakumara |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Watershed
Land use Present value Total cost business.industry media_common.quotation_subject 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Payment 01 natural sciences 020801 environmental engineering Ecosystem services Environmental science Computers in Earth Sciences Statistics Probability and Uncertainty General Agricultural and Biological Sciences Water resource management Soil conservation business Hydropower 0105 earth and related environmental sciences General Environmental Science media_common |
| Zdroj: | Modeling Earth Systems and Environment. 8:1617-1634 |
| ISSN: | 2363-6211 2363-6203 |
| DOI: | 10.1007/s40808-021-01169-6 |
| Popis: | Uma Oya watershed that feeds Rantambe reservoir in Sri Lanka is severely affected by soil erosion due to the inappropriate land-use practices. This study assesses the impact of soil erosion on reservoir sedimentation and the economic losses by adopting Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) Sediment Retention model and investigates mechanisms available for minimising the impacts. Data sources included digital map data from GIS, household questionnaire survey and field level data. Three land-use interventions were modelled to determine changes in sedimentation against the current land use. Three interventions available for the power generation facility (PGF) to mitigate loss of hydropower were analysed against each land-use intervention. Mechanisms available for implementing a payment for ecosystem service were analysed next. The current average soil erosion rate in the watershed is 10.7 tons/ha/year. Under the best intervention strategy available for the PGF, this translates into a total cost of LKR 601.7 million in present value (PV) terms for the remaining life of the reservoir with a 10% discount rate. Soil and water conservation (SWC) intervention for the watershed reduces the soil erosion rate by 23%, which results in total savings of LKR 88.7 million (PV). Implementing SWC intervention by farmers requires that they are paid the full cost. Since payment from the PGF is not adequate for this, an additional payment from the fertiliser importing authority of the country is proposed. The study suggests further full scale multi-dimensional analysis that combine multitude of agencies along with temporal dimensions to arrive at the best solution. |
| Databáze: | OpenAIRE |
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