论文信息 - Calibration and validation of SWAT model and estimation of water balance components of Shaya mountainous watershed, Southeastern Ethiopia

Calibration and validation of SWAT model and estimation of water balance components of Shaya mountainous watershed, Southeastern Ethiopia

Abstract. To utilize water resources in a sustainable manner, it is necessary to understand the quantity and quality in space and time. This study was initiated to evaluate the performance and applicability of the physically based Soil and Water Assessment Tool (SWAT) model in analyzing the influence of hydrologic parameters on the streamflow variability and estimation of monthly and seasonal water yield at the outlet of Shaya mountainous watershed. The calibrated SWAT model performed well for simulation of monthly streamflow. Statistical model performance measures, coefficient of determination (r2) of 0.71, the Nash–Sutcliffe simulation efficiency (ENS) of 0.71 and percent difference (D) of 3.69, for calibration and 0.76, 0.75 and 3.30, respectively for validation, indicated good performance of the model simulation on monthly time step. Mean monthly and annual water yield simulated with the calibrated model were found to be 25.8 mm and 309.0 mm, respectively. Overall, the model demonstrated good performance in capturing the patterns and trend of the observed flow series, which confirmed the appropriateness of the model for future scenario simulation. Therefore, SWAT model can be taken as a potential tool for simulation of the hydrology of unguaged watershed in mountainous areas, which behave hydro-meteorologically similar with Shaya watershed. Future studies on Shaya watershed modeling should address the issues related to water quality and evaluate best management practices.

[1] A. Kamara,et al. Integrated water and land management research and capacity building priorities for Ethiopia: proceedings of a MoWR/EARO/IWMI/ILRI international workship held at ILRI, Addis Ababa, Ethiopia, 2-4 December 2002 , 2003 .

[2] M. P. Tripathi,et al. Identification and Prioritisation of Critical Sub-watersheds for Soil Conservation Management using the SWAT Model , 2003 .

[3] Jeffrey G. Arnold,et al. Model Evaluation Guidelines for Systematic Quantification of Accuracy in Watershed Simulations , 2007 .

[4] John R. Williams,et al. LARGE AREA HYDROLOGIC MODELING AND ASSESSMENT PART I: MODEL DEVELOPMENT 1 , 1998 .

[5] Sanjay K. Jain,et al. Simulation of Runoff and Sediment Yield for a Himalayan Watershed Using SWAT Model , 2010 .

[6] J. Arnold,et al. VALIDATION OF THE SWAT MODEL ON A LARGE RWER BASIN WITH POINT AND NONPOINT SOURCES 1 , 2001 .

[7] J. Nash,et al. River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[8] Jeffrey G. Arnold,et al. The Soil and Water Assessment Tool: Historical Development, Applications, and Future Research Directions , 2007 .

[9] J. Arnold,et al. AUTOMATED METHODS FOR ESTIMATING BASEFLOW AND GROUND WATER RECHARGE FROM STREAMFLOW RECORDS 1 , 1999 .