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Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency
Xie Xiang-ping1; Wei Fang-qiang2; Wang Xiao-jun1; Yang Hong-juan3
2019-03-01
摘要The herringbone water-sediment separation structure (HWSSS) was developed to 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 P-t 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.
关键词Debris flow Water-sediment separation Structure design Sediment separation efficiency Grid opening width
DOI10.1007/s11629-018-5038-7
发表期刊JOURNAL OF MOUNTAIN SCIENCE
ISSN1672-6316
卷号16期号:3页码:619-629
通讯作者Wei Fang-qiang(fqwei@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000460754100010
语种英语