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Ecopersia، جلد ۱۲، شماره ۴، صفحات ۳۲۹-۳۵۰
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عنوان انگلیسی Assessing the Impact of Spatial Accuracy of Digital Elevation Models on Simulating Discharge in Arid Regions Using SWAT Model: A Case Study of the Lar Watershed
چکیده انگلیسی مقاله The digital elevation model (DEM) map plays a crucial role in the SWAT model, significantly impacting its output results. This study examines the influence of various accuracies of Digital Elevation Models (DEMs) with resolutions of 12.5, 30, 50, 90, 450, and 1000 meters on runoff simulation using the SWAT model for the Lar watershed. The model was simulated over a 30-year period (1988-2017), with the initial three years allocated for model warm-up, the subsequent period (1988-2005) for calibration, and the period from 2006 to 2017 for validation. Model accuracy was assessed using Nash-Sutcliffe efficiency (NS), coefficient of determination (R²), R-factor, and P-factor. The runoff simulation results reveal that variables such as area, sub-basin, Hydrologic Response Unit (HRU), watershed slope, and average channel slope are particularly affected by DEM accuracy. With increasing DEM accuracy, the length of the main channels decreases, and lower-order channels are eliminated, leading to a reduction in the calculated runoff depth. During validation and calibration, DEM resolutions of 12.5 and 1000 meters exhibited lower accuracy compared to resolutions of 30, 50, 90, and 450 meters, suggesting that extremely high or low spatial data accuracy does not enhance simulation accuracy. Additionally, minimal differences were observed among the results for DEM resolutions of 30, 50, 90, and 450 meters, which can be attributed to adjustments in calibrated variable values and the application of the SUFI-2 method across different DEM accuracies.
 
کلیدواژه‌های انگلیسی مقاله SWAT-CUP,DEM,SUFI-2 method,Nash-Sutcliffe efficiency,SWAT hydrological model
نویسندگان مقاله | Mahnaz Kiyani Majd
Former M.Sc. Student of Watershed Management, Department of Rangeland and Watershed Management, Faculty of Water and Soil, University of Zabol, Zabol, Iran


| Mohammad Nohtani
Assistant professor, Department of Rangeland and Watershed Management, Faculty of Water and Soil, University of Zabol, Zabol, Iran


| Mohammad Reza Dahmardeh Ghaleno
Associate professor, Department of Rangeland and Watershed Management, Faculty of Water and Soil, University of Zabol, Zabol, Iran


| Zahra Sheikh
Department of Combat Desertification, Desert Studies Faculty, Semnan University, Semnan, Iran
نشانی اینترنتی http://ecopersia.modares.ac.ir/browse.php?a_code=A-10-10186-2&slc_lang=en&sid=24
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