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Evaluating Monthly Flow Prediction based on SWAT and Support Vector Regression Coupled with Discrete Wavelet Transform
Citation:
Yuan, L. AND K. Forshay. Evaluating Monthly Flow Prediction based on SWAT and Support Vector Regression Coupled with Discrete Wavelet Transform. WATER. MDPI, Basel, Switzerland, 14(17):2649, (2022). https://doi.org/10.3390/w14172649
Impact/Purpose:
Accurate streamflow prediction plays a pivotal role in hydraulic project design, nonpoint source pollution estimation, and water resources planning and management. This study developed the hybrid SWAT-SVR model with Wavelet transform to improve calibration. This new SWAT-SVR Wavelet calibrated model has the ability to capture intrinsic non-linear behaviors in rainfall and runoff while considering the mechanism that would otherwise lead to poor prediction of runoff generation but also can serve as a reliable tool for a ungauged or limited data components within a watershed that has similar hydrologic characteristics to the IRW.
Description:
Reliable and accurate streamflow prediction plays a critical role in watershed water resources planning and management. We developed a new hybrid SWAT-WSVR model based on 12 hydrological sites in the Illinois River watershed (IRW), U.S., that integrated the Soil and Water Assessment Tool (SWAT) model with a Support Vector Regression (SVR) calibration method coupled with discrete wavelet transforms (DWT) to better support modeling watersheds with limited data availability. Wavelet components of the simulated streamflow from the SWAT-Calibration Uncertainty Procedure (SWAT-CUP) and precipitation time series were used as inputs to SVR to build a hybrid SWAT-WSVR. We examined the performance and potential of the SWAT-WSVR model and compared it with observations, SWAT-CUP, and SWAT-SVR using statistical metrics, Taylor diagrams, and hydrography. The results showed that the average of RMSE-observation’s standard deviation ratio (RSR), Nash-Sutcliffe efficiency (NSE), percent bias (PBIAS), and root mean square error (RMSE) from SWAT-WSVR is 0.02, 1.00, -0.15, and 0.27 m3 s-1 in calibration, and 0.14, 0.98, -1.88, and 2.91 m3 s-1 in validation on 12 sites, respectively. Compared with the other two models, the proposed SWAT-WSVR model possessed lower discrepancy and higher accuracy. The rank of the overall performance of the three SWAT-based models during the whole study period was SWAT-WSVR > SWAT-SVR > SWAT-CUP. The developed SWAT-WSVR model supplies an additional calibration approach that can improve the accuracy of the SWAT streamflow simulation of watersheds with limited data.
URLs/Downloads:
DOI: Evaluating Monthly Flow Prediction based on SWAT and Support Vector Regression Coupled with Discrete Wavelet Transform
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