Quantifying and mapping of water-related ecosystem services for enhancing the security of the food-water-energy nexus in tropical data– sparse catchment
Sahle, Mesfin, Saito, Osamu, Furst, Christine and Yeshitela, Kumelachew, (2019). Quantifying and mapping of water-related ecosystem services for enhancing the security of the food-water-energy nexus in tropical data– sparse catchment. Science of the Total Environment, 646 573-586
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Article
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Sub-type Journal article Author Sahle, Mesfin
Saito, Osamu
Furst, Christine
Yeshitela, KumelachewTitle Quantifying and mapping of water-related ecosystem services for enhancing the security of the food-water-energy nexus in tropical data– sparse catchment Appearing in Science of the Total Environment Volume 646 Publication Date 2019-01-01 Place of Publication Online Publisher Elsevier Start page 573 End page 586 Language eng Abstract The food-water-energy nexus concept helps to produce an integrative solutions to secure the water-related ecosystem services sustainably. This study aims to quantify and map water provisioning and soil erosion regulating services from both demand and supply sides in a spatially explicit manner. It considers the Wabe River catchment of the Omo-Gibe Basin in tropical data-sparse region of East Africa as a case study and uses the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) annual and seasonal water yield and sediment delivery models. The water demands and biophysical parameters data were collected from primary and secondary sources and prepared according to the requirement of the models. The models output were validated after conducting sensitivity analysis of the input parameters. The result shows that the rainfall amount of the catchment is highly seasonal, which causes the surface water to vary according to the seasons. The high annual precipitation and low actual evapotranspiration of the catchment resulted high annual water yields. However, the people in the catchment did not satisfied their domestic water demand as result of inaccessibility and poor management of the rain water. The high net supply of water, especially in the rainy season, carries detached top soil via heavy rainfall in the upper catchment areas. Even though the existing land cover and management practices contribute to sediment retention, a large amount of sediment is exported to rivers, which jeopardizes the food and energy security. Thus, the management of water is essential for enhancing the security of the food-water-energy nexus in the catchment. The methods applied in this study can increase spatial understanding of the water-related ecosystem services especially in data–sparse catchments of the tropics, and lead to improvement of water management to enhance the security nexus. Keyword InVEST
Quickflow
Water yield
Water demand
Sediment retention
Water managementCopyright Holder Elsevier B. V. Copyright Year 2018 Copyright type All rights reserved DOI 10.1016/j.scitotenv.2018.07.347 -
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