Modelling hydrological response under climate change scenarios using SWAT model: the case of Ilala watershed, Northern Ethiopia

被引：38
作者：
Shiferaw H. [1 ]
Gebremedhin A. [1 ]
Gebretsadkan T. [3 ,4 ]
Zenebe A. [1 ,2 ]
机构：
[1] Institute of Climate and Society, Mekelle University, POB 231, Mekelle
[2] Department of Land Resources Management and Environmental Protection, Mekelle University, Mekelle
[3] Tigray Agricultural Research Institute (TARI), Mekelle
[4] UNESCO-IHE Institute for Water Education, Delft
来源：
Modeling Earth Systems and Environment | 2018年 / 4卷 / 1期
关键词：
Evapotranspiration; RCP; Runoff; SWAT; SWAT-CUP; Watershed;
D O I：
10.1007/s40808-018-0439-8
中图分类号：
学科分类号：
摘要：
This study evaluates surface runoff generation under climate change scenarios for Ilala watershed in Northern highlands of Ethiopia. The climate change scenarios were analyzed using delta based statistical downscaling approach of RCPs 4.5 and 8.5 in R software packages. Hydrological response to climate changes were evaluated using the Soil and Water Assessment Tool model. The Soil Water Analysis Calibration and Uncertainty Program of Sequential Uncertainty fitting version 2 algorithm was also used to compute the uncertainty analysis, calibration and validation process. The results show that the minimum and maximum temperature increases for the future of 1.7 and 4.7 °C respectively. However, the rainfall doesn’t show any significant increase or decrease trend in the study area. The 95% prediction uncertainty brackets the average values of observation by 71 and 74% during the calibration and validation processes, respectively. Similarly, R-factor equals to 0.5 and 0.6 during calibration and validation periods. The simulated and observed hydrographs of the total river yield showed a good agreement during calibration (NSE = 0.51, R2 = 0.54) and validation (NSE = 0.54, R2 = 0.63). From the total rainfall received only 6.2% portion of the rainfall was changed into surface runoff. The rainfall-runoff relationship was strongly correlated with R2 = 0.97. Moreover, there had been also high evapotranspiration (ET) loss in the watershed; almost 75% of the total rainfall was lost as ET and 7.8% as ground water recharge. Due to an increase trend in temperature and evaporation loss for the future, the surface runoff also declined from 1.74% in RCP4.5 near-term to 0.36% in RCP8.5 end-term periods. This implies, proper planning and implementation of appropriate water management strategies is needed for sustainable water resources management in the region. © 2018, Springer International Publishing AG, part of Springer Nature.
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页码：437 / 449
页数：12
相关论文
共 45 条
[1]  
Abbaspour K.C., Johnson C.A., van Genuchten M.T., Estimating uncertain flow and transport parameters using a sequential uncertainty fitting procedure, 3, pp. 1340-1352, (2004)
[2]  
Abebe B.A., Modeling The Effect of Climate and Land Use Change on The Water Resources in Northern Ethiopia: The Case of Suluh River Basin, (2014)
[3]  
Alemayehu F., Taha N., Nyssen J., Et al., The impacts of watershed management on land use and land cover dynamics in Eastern Tigray (Ethiopia), Resour Conserv Recycl, 53, pp. 192-198, (2009)
[4]  
Araya A., Girma A., Demelash T., Et al., Assessing impacts of climate change on tef (Eragrostis tef) productivity in Debrezeit area, Ethiopia, 4, pp. 39-48, (2015)
[5]  
Araya A., Hoogenboom G., Luedeling E., Et al., Assessment of maize growth and yield using crop models under present and future climate in southwestern Ethiopia, Agric For Meteorol, 214-215, pp. 252-265, (2015)
[6]  
Araya A., Kisekka I., Girma A., Et al., The challenges and opportunities for wheat production under future climate in Northern Ethiopia, J Agric Sci, 155, pp. 379-393, (2017)
[7]  
Arnold J.G., The GIS Tool Chosen was the Geographical, 34, pp. 91-101, (1998)
[8]  
Arnold J.G., Srinivasan R., Muttiah R.S., Williams J.R., Large area hydrologic modeling and assesment part I: model development, JAWRA J Am Water Resour Assoc, 34, pp. 73-89, (1998)
[9]  
Modeling Hydrological Responses to Changes in Land Cover and Climate in Geba River Basin, Northern Ethiopia. Ph.D. Thesis, (2014)
[10]  
Awulachew S.B., Erkossa T., Smakhtin V., Fernando A., Improved Water and Land Management in the Ethiopian Highlands: Its Impact on Downstream Stakeholders Dependent on the Blue Nile, (2009)
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