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<p>The sediment-trapping slow-release eco-dam has been increasingly employed to intercept sediment, release purified water, detent flood and peak flow. To investigate its permeability mechanism, this study employed geotextile-wrapped filter media to form four types of filter cells: (a) fine sand, (b) medium sand, (c) coarse sand, and (d) layered composite. Considering hydraulic head (seepage pressure), dam height (consolidation pressure), and sediment concentration, an orthogonal experimental design was implemented to determine the horizontal permeability coefficient. Results demonstrated that the fine sand filter cell exhibited the lowest permeability across all test conditions, which was significantly lower by one order of magnitude compared to other filter cell configurations. Silt concentration was a key influencing factor for both fine sand and coarse sand, exhibiting a significant negative correlation with the horizontal permeability coefficient. For medium sand filter media, seepage pressure served as the primary driving factor. The order of influencing factors for layered composite filter media is: Sediment Concentration &gt; Consolidation pressure &gt; Seepage pressure. Under conditions of seepage pressure, consolidation pressure, and Sediment Concentration, the influence of a single factor on the horizontal permeability coefficient of different filter units consistently follows the order: coarse sand &gt; medium sand &gt; layered composite &gt; fine sand.These findings establish a scientific foundation for material screening in ecological dam engineering and advance the mechanistic understanding of permeability processes.</p>

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Investigation of The Permeability Characteristics of Sediment-trapping Slow-release Ecological Dams and Their Filter Media

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Hu Sha,
  • Yi Ma,
  • Yaofa Wang,
  • Xiaogang Li,
  • Juan Li

摘要

The sediment-trapping slow-release eco-dam has been increasingly employed to intercept sediment, release purified water, detent flood and peak flow. To investigate its permeability mechanism, this study employed geotextile-wrapped filter media to form four types of filter cells: (a) fine sand, (b) medium sand, (c) coarse sand, and (d) layered composite. Considering hydraulic head (seepage pressure), dam height (consolidation pressure), and sediment concentration, an orthogonal experimental design was implemented to determine the horizontal permeability coefficient. Results demonstrated that the fine sand filter cell exhibited the lowest permeability across all test conditions, which was significantly lower by one order of magnitude compared to other filter cell configurations. Silt concentration was a key influencing factor for both fine sand and coarse sand, exhibiting a significant negative correlation with the horizontal permeability coefficient. For medium sand filter media, seepage pressure served as the primary driving factor. The order of influencing factors for layered composite filter media is: Sediment Concentration > Consolidation pressure > Seepage pressure. Under conditions of seepage pressure, consolidation pressure, and Sediment Concentration, the influence of a single factor on the horizontal permeability coefficient of different filter units consistently follows the order: coarse sand > medium sand > layered composite > fine sand.These findings establish a scientific foundation for material screening in ecological dam engineering and advance the mechanistic understanding of permeability processes.