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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  • Sub-type Journal article
    Author Sahle, Mesfin
    Saito, Osamu
    Furst, Christine
    Yeshitela, Kumelachew
    Title 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 management
    Copyright Holder Elsevier B. V.
    Copyright Year 2018
    Copyright type All rights reserved
    DOI 10.1016/j.scitotenv.2018.07.347
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    Created: Mon, 30 Jul 2018, 11:00:28 JST by PEGUES, Susan Scott on behalf of UNU IAS