Modeling the sediment yield and estimating the best management practices in the Seybouse basin, Northeastern Algeria

Abstract

Identifying vulnerable areas to erosion within the watershed and implementing best management practices (BMPs) are crucial steps in mitigating watershed degradation by minimizing sediment yields. The present study evaluates and identifies the BMPs in the Seybouse basin, northeastern Algeria, using the Soil and Water Assessment Tool (SWAT) model. After successful calibration and validation, the model demonstrated a satisfactory ability to simulate monthly discharge and sediment. Then, the calibrated model was employed to evaluate the efficacy of diverse management practices in sediment control. In the SWAT, three soil and conservation practices, as well as vegetated filter strips (VFSs), grade stabilization structures (GSSs), and terracing were evaluated. The average annual sediment yield in the Seybouse watershed is determined to be 14.43 t/ha year, constituting 71% of the total soil loss. VFS demonstrated a sediment reduction of 37.30%, GSS 20.40%, and terracing 42.30%. Among these strategies, terracing results in the greatest reduction, followed by VFS. The results of this study area can be useful for informed decision-making regarding optimal watershed management strategies. HIGHLIGHTS Model development: we have developed a robust sediment yield model (Soil and Water Assessment Tool (SWAT)) to the Seybouse basin, considering various climatic, geological, and land-use factors.; Best management practices: we have identified and assessed the effectiveness of several best management practices.; Policy implications: importance of integrating sediment management strategies into regional.;

Keywords

• bmps
• gss
• sensitivity analysis
• seybouse
• swat
• terracing and vfs