Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency

最小化 最大化

Vol16 No.3: 619-629

Title】Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency

Author】XIE Xiang-ping1; WEI Fang-qiang2*; WANG Xiao-jun1; YANG Hong-juan3

Addresses】1 Anyang Institute of Technology, Anyang 455000, China; 2 Chongqing Institutes of Green and Intelligent Technology, Chinese Academy of Science, Chongqing 400714, China; 3 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China

Corresponding author】WEI Fang-qiang

Citation】Xie XP, Wei FQ, Wang XJ, et al. (2019) Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency.Journal of Mountain Science 16(3). https://doi.org/10.1007/s11629-018-5038-7

DOI】https://doi.org/10.1007/s11629-018-5038-7

Abstract】The herringbone water-sediment separation structure (HWSSS) wasdevelopedto prevent debris flows. This paper mainly focuses on evaluating the sediment separation efficiency of HWSSS in debris flow prevention and determining the grid opening width D, a crucial structure parameter for HWSSS design. Theoretical analysis on the total sediment separation rate Pt reveals that the efficiency of sediment separation is much related with sediment grain size distribution (GSD) and grid opening width. The lower limit of Pt is deduced from the perspective of safety consideration by transforming debris flow into sediment-laden flow. Hydraulic model tests were carried out. Based on the regression analysis of the experimental data, the quantitative relationships between Pt and D and GSD characteristic values were finally established. A procedure for determining optimal grid opening width is proposed based on these analyses. These results are of significance in evaluating sediment separation effect by HWSSS in debris flow prevention and contribute to a more explicit methodology for design of HWSSS.

Keywords】Debris flow;Water-sediment separation; Structure design;Sediment separation efficiency;Grid opening width