Uncertainty Analysis of Hydrological Parameters of Sarbaz Watershed Using SWAT Model and SUFI-۲ Algorithm
Publish place: Journal of Hydrosciences and Environment، Vol: 4، Issue: 7
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
View: 265
This Paper With 14 Page And PDF Format Ready To Download
- Certificate
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_JHE-4-7_006
تاریخ نمایه سازی: 20 تیر 1400
Abstract:
The SWAT model was used to simulate the monthly runoff of the Sarbaz watershed (۶۳۲۴ Km۲) located in Sistan-va- Baluchestan province of Iran. The main objective of the study was to evaluate the accuracy of the SWAT model simulation in the calibration and validation stages and to analyze the uncertainty of input parameters of the model. A hydrological modeling approach was used to identify the sensitive hydrological input parameters of the watershed through the SUFI-۲ algorithm. The important parameters of the model were determined by the general sensitivity analysis, and the model was, then, calibrated for ۱۹۹۷-۲۰۰۵ with two years as the warm-up (۱۹۹۷–۱۹۹۸) by a multi-objective optimization approach using the SWAT-CUP program. Subsequently, the model was validated on a dataset of five years (۲۰۰۶–۲۰۱۰). To reduce the uncertainty, different components of the water balance were considered in the calibration stage, and data from the Pishin station were used. Based on the p-value and t-stat, the most sensitive parameters were the curve number and the parameter of alpha in return flow, and the parameter with the lowest sensitivity was the percentage of deep aquifer feeding on the shallow aquifer. The performance of the model was tested using two objective functions of Nash–Sutcliffe efficiency (NSE) and coefficient of determination (R۲). R۲ and NSE were estimated at ۰.۸۳ and ۰.۸۰ in calibration and ۰.۵۳ and ۰.۳۸ in validation, respectively. Acceptable values were also obtained for the uncertainty assessment indicators. The p-factor and r-factor were calculated to be ۰.۷۶ and ۱.۵۳ for the calibration stage and ۰.۷۲ and ۱.۲۳ for the validation stage, respectively. In addition to confirming the goodness of fit for the conditions of the Sarbaz watershed, these results indicate that the model can positively affect the simulated runoff in future projects due to the dynamics of the model parameters in the specified uncertainty interval.
Keywords:
Authors
Kh Gorgij
Graduated Master student, Soil and Water Faculty, University of Zabol, Zahedan, Iran
A Dehvari
Assistant professor of range & watershed management Department, Soil and Water Faculty, University of Zabol, Zabol, Iran
M Dahmardeh Ghaleno
Assistant professor of range & watershed management Department, Soil and Water Faculty, University of Zabol, Zabol, Iran.
مراجع و منابع این Paper:
لیست زیر مراجع و منابع استفاده شده در این Paper را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود Paper لینک شده اند :