Evaluation of the effectiveness and applicability of a multi-layer filter-mesh sediment bucket for forestland soil erosion monitoring in red soil hilly regions

DONG Zhen, HAO Yanfang, CHEN Xia, HOU Ruijiao, TONG Fan, LIU Liang

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 0 DOI: 10.12302/j.issn.1000-2006.202602015

Evaluation of the effectiveness and applicability of a multi-layer filter-mesh sediment bucket for forestland soil erosion monitoring in red soil hilly regions

  • DONG Zhen1, HAO Yanfang, CHEN Xia1, HOU Ruijiao1, TONG Fan, LIU Liang1,*
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Abstract

【Objective】In the red soil hilly region of southern China, erosion on forested slopes is characterized by low sediment yield, concealed erosion processes, and limited applicability of conventional runoff-sediment collection devices. To address these problems, this study designed a small multi-layer filter-mesh sediment bucket and screened suitable mesh combinations for sediment collection on forested slopes, aiming to provide a reference for structural optimization and practical application of the sediment bucket. 【Method】Indoor simulated runoff scouring experiments were conducted with 10 filter-mesh combinations, 2 slope gradients (5° and 15°), and 2 flow rates (0.8 and 2.4 L/min), resulting in 40 experimental conditions. Each condition was replicated three times. Sediment interception efficiency and relative blocking time were used as evaluation indicators to analyze the sediment retention and sediment accumulation behavior of different filter-mesh combinations, and mesh combinations with better overall performance were selected. 【Result】The results showed that slope gradient and flow rate jointly affected the operational performance of the sediment bucket. Under steeper slope and higher flow conditions, sediment interception efficiency decreased and operational stability weakened. At a flow rate of 2.4 L/min, when the slope increased from 5° to 15°, the average interception efficiency decreased from 72.0% to 63.4%. Filter-mesh structure was an important internal factor affecting device performance. A larger-aperture mesh in the first layer helped maintain water conveyance capacity and reduce clogging, while combinations with a relatively gradual decrease in mesh aperture between layers achieved a better balance between sediment interception and drainage stability. The comprehensive evaluation showed that S5/1/0.1(mm) (with mesh apertures of 5, 1, and 0.1 mm in the first, second, and third layers, respectively) performed best under gentle slope conditions, whereas S5/2/1(mm) (with mesh apertures of 5, 2, and 1 mm in the first, second, and third layers, respectively) was more suitable for steep slope conditions. 【Conclusion】This study provides a scientific basis for the structural optimization of soil erosion monitoring devices in forestland of red soil hilly regions and supports their subsequent field application.

Key words

sediment trap / runoff sediment monitoring / red soil hilly regions / screen structure optimization / interception efficiency

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DONG Zhen, HAO Yanfang, CHEN Xia, HOU Ruijiao, TONG Fan, LIU Liang. Evaluation of the effectiveness and applicability of a multi-layer filter-mesh sediment bucket for forestland soil erosion monitoring in red soil hilly regions[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 0 https://doi.org/10.12302/j.issn.1000-2006.202602015

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