Quantifying and mapping of water-related ecosystem services for enhancing the security of the food-water-energy nexus in tropical data-sparse catchment.

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.

[1]  J. Poesen,et al.  Rainfall erosivity and variability in the Northern Ethiopian Highlands , 2005 .

[2]  S. Broadmeadow,et al.  The effects of riparian forest management on the freshwater environment: a literature review of best management practice , 2004 .

[3]  G. Rasul.  Managing the food, water, and energy nexus for achieving the Sustainable Development Goals in South Asia , 2016 .

[4]  Assefa M. Melesse,et al.  GIS-based hydrological zones and soil geo-database of Ethiopia , 2013 .

[5]  C. Scott,et al.  The Water-Energy-Food Nexus: A systematic review of methods for nexus assessment , 2018 .

[6]  R. Devi,et al.  Assessment of siltation and nutrient enrichment of Gilgel Gibe dam, Southwest Ethiopia. , 2008, Bioresource technology.

[7]  Jon E. Schoonover,et al.  An Introduction to Soil Concepts and the Role of Soils in Watershed Management , 2015 .

[8]  Gerard Govers,et al.  A GIS procedure for automatically calculating the USLE LS factor on topographically complex landscape units , 1996 .

[9]  Michel Hlpe.  Water for food security and nutrition , 2015 .

[10]  G. Ziv,et al.  Empirical validation of the InVEST water yield ecosystem service model at a national scale. , 2016, The Science of the total environment.

[11]  T. McMahon,et al.  Estimating actual, potential, reference crop and pan evaporation using standard meteorological data: a pragmatic synthesis , 2013 .

[12]  G. Rasul,et al.  The nexus approach to water–energy–food security: an option for adaptation to climate change , 2016 .

[13]  Y. Seleshi,et al.  Estimating environmental flow requirements downstream of the Chara Chara weir on the Blue Nile River , 2009 .

[14]  Sanjiv Tyagi,et al.  Influences of natural and anthropogenic factors on surface and groundwater quality in rural and urban areas , 2015 .

[15]  M. Borga,et al.  A data acquisition framework for prediction of runoff in ungauged basins , 2012 .

[16]  P. Thornton.  Livestock production: recent trends, future prospects , 2010, Philosophical Transactions of the Royal Society B: Biological Sciences.

[17]  H. Velthuizen,et al.  Harmonized World Soil Database (version 1.2) , 2008 .

[18]  A. Neef,et al.  Sustainable development and the water–energy–food nexus: A perspective on livelihoods , 2015 .

[19]  G. R. Foster,et al.  Predicting soil erosion by water : a guide to conservation planning with the Revised Universal Soil Loss Equation (RUSLE) , 1997 .

[20]  Atsushi Tsunekawa,et al.  Reservoir sedimentation and its mitigating strategies: a case study of Angereb reservoir (NW Ethiopia) , 2012, Journal of Soils and Sediments.

[21]  David Pimentel,et al.  Soil Erosion Threatens Food Production , 2013 .

[22]  Habtamu Sewnet Gelagay,et al.  Soil loss estimation using GIS and Remote sensing techniques: A case of Koga watershed, Northwestern Ethiopia , 2016, International Soil and Water Conservation Research.

[23]  A. Reynaud,et al.  Mapping water provisioning services to support the ecosystem-water-food-energy nexus in the Danube river basin , 2016 .

[24]  Daniel Mabrey,et al.  Moving from theory to practice in the water–energy–food nexus: An evaluation of existing models and frameworks , 2018, Water-Energy Nexus.

[25]  A. Tegegne,et al.  Water resources for livestock in Ethiopia: implications for research and development , 2003 .

[26]  Vitor Augusto Ozaki,et al.  Missing data imputation of climate datasets: implications to modeling extreme drought events , 2014 .

[27]  Dolf Gielen,et al.  Considering the energy, water and food nexus: Towards an integrated modelling approach , 2011 .

[28]  Winfried E. H. Blum,et al.  Soil and Land Resources for Agricultural Production: General Trends and Future Scenarios-A Worldwide Perspective , 2013, International Soil and Water Conservation Research.

[29]  Drop size distribution and kinetic energy load of rainfall events in the highlands of the Central Rift Valley, Ethiopia , 2014 .

[30]  Raghavan Srinivasan,et al.  Extension and validation of a geographic information system-based method for calculating the Revised Universal Soil Loss Equation length-slope factor for erosion risk assessments in large watersheds , 2008, Journal of Soil and Water Conservation.

[31]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[32]  Jan Nyssen,et al.  Sediment dynamics and the role of flash floods in sediment export from medium-sized catchments: a case study from the semi-arid tropical highlands in northern Ethiopia , 2010 .

[33]  Marta Schuhmacher,et al.  Sensitivity analysis of ecosystem service valuation in a Mediterranean watershed. , 2012, The Science of the total environment.

[34]  B. L. McGlynn,et al.  A data acquisition framework for runoff prediction in ungauged basins , 2013 .

[35]  J. Poesen,et al.  Soil erosion and conservation in Ethiopia , 2015 .

[36]  F. Müller,et al.  Water-related ecosystem services in Western Siberian lowland basins—Analysing and mapping spatial and seasonal effects on regulating services based on ecohydrological modelling results , 2016 .

[37]  D. Russi,et al.  The economics of ecosystems and biodiversity for water and wetlands : executive summary , 2013 .

[38]  H. Joosten,et al.  Peatlands : guidance for climate change mitigation by conservation, rehabilitation and sustainable use , 2012 .

[39]  T. Nielsen,et al.  Hydropower in the Context of Sustainable Energy Supply: A Review of Technologies and Challenges , 2012 .

[40]  Michael D. Dukes,et al.  Step by Step Calculation of the Penman-Monteith Evapotranspiration (FAO-56 Method) 1 , 2015 .

[41]  Kebede Wolka Wolancho.  Watershed management: an option to sustain dam and reservoir function in Ethiopia. , 2012 .

[42]  T. Oweis,et al.  SUPPLEMENTAL IRRIGATION A HIGHLY EFFICIENT WATER-USE PRACTICE , 2012 .

[43]  H. Hurni,.  Erosion - productivity - conservation systems in Ethiopia , 1985 .

[44]  M. Ashraf,et al.  Impact of soil erosion and degradation on water quality: a review , 2017 .

[45]  Huiming Wang,et al.  Spatio-temporal evolution of water-related ecosystem services: Taihu Basin, China , 2018, PeerJ.

[46]  K. Welde,et al.  Identification and prioritization of subwatersheds for land and water management in Tekeze dam watershed, Northern Ethiopia , 2016, International Soil and Water Conservation Research.

[47]  W. Sutherland,et al.  Solution scanning as a key policy tool: identifying management interventions to help maintain and enhance regulating ecosystem services , 2014 .

[48]  R. D. Groot,et al.  Challenges in integrating the concept of ecosystem services and values in landscape planning, management and decision making , 2010 .