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Purpose <p>The objectives of this study were to elucidate the impact mechanisms of concentrated flow (CF) on the sediment interception efficiency of Vegetative Filter Strips (VFS), to identify key drivers affecting VFS performance, and to propose improvements to mitigate CF’s adverse effects.</p> Methods <p>This study combined field monitoring with the VFSMOD-W numerical model to analyze the interception performance of VFS under different rainfall features in both uniform flow and CF conditions. Key parameters of the VFSMOD-W model were extracted using Morris and Fast analyses, and Redundancy Analysis (RDA) was employed to identify the main driving factors influencing VFS performance under different runoff patterns.</p> Results <p>In all simulated scenarios, the presence of CF resulted in the minimum interception efficiencies of VFS for runoff and sediment being 0.9% and 35.0%, respectively, not only diminishing the overall effectiveness of VFS but also exacerbating the negative impact of various rainfall features. Morris and Fast analyses identified the critical parameters of the VFSMOD-W model, while the RDA analysis further indicated that the presence of CF (88.5%) better explained the variation in VFS performance compared to uniform flow (81.7%). The effective flow width of the strip (FWIDTH, 34.6%) and rainfall intensity (T, 30.2%) were the primary driving factors, while VFS physical parameters such as the length in the direction of flow (VL) and soil vertical saturated hydraulic conductivity in the VFS (VKS) contributed 14.9%.</p> Conclusions <p>Surface runoff patterns determine VFS performance. Under CF conditions, optimizing VFS design can increase sediment interception efficiency by more than 60% compared to conventional designs, and reduce the amount of cultivated land occupied.</p>

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Assessment of the major factors influencing the efficiency of vegetated filter strips under concentrated flow conditions — a case study in Northeast China

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Yang Ou,
  • Yang Deng,
  • Liming Yan,
  • Qi Cui,
  • Baixing Yan,
  • Minglian Shang,
  • Huiping Liu,
  • Jibin Wang

摘要

Purpose

The objectives of this study were to elucidate the impact mechanisms of concentrated flow (CF) on the sediment interception efficiency of Vegetative Filter Strips (VFS), to identify key drivers affecting VFS performance, and to propose improvements to mitigate CF’s adverse effects.

Methods

This study combined field monitoring with the VFSMOD-W numerical model to analyze the interception performance of VFS under different rainfall features in both uniform flow and CF conditions. Key parameters of the VFSMOD-W model were extracted using Morris and Fast analyses, and Redundancy Analysis (RDA) was employed to identify the main driving factors influencing VFS performance under different runoff patterns.

Results

In all simulated scenarios, the presence of CF resulted in the minimum interception efficiencies of VFS for runoff and sediment being 0.9% and 35.0%, respectively, not only diminishing the overall effectiveness of VFS but also exacerbating the negative impact of various rainfall features. Morris and Fast analyses identified the critical parameters of the VFSMOD-W model, while the RDA analysis further indicated that the presence of CF (88.5%) better explained the variation in VFS performance compared to uniform flow (81.7%). The effective flow width of the strip (FWIDTH, 34.6%) and rainfall intensity (T, 30.2%) were the primary driving factors, while VFS physical parameters such as the length in the direction of flow (VL) and soil vertical saturated hydraulic conductivity in the VFS (VKS) contributed 14.9%.

Conclusions

Surface runoff patterns determine VFS performance. Under CF conditions, optimizing VFS design can increase sediment interception efficiency by more than 60% compared to conventional designs, and reduce the amount of cultivated land occupied.