文章摘要
尹艳, 高建恩, 李慧娟, 韩赛奇, 周媚芳.坡面薄层含沙水流水动力学参数提取的方法[J].水土保持学报,2019,33(1):25~31,38
坡面薄层含沙水流水动力学参数提取的方法
Study on Extraction Methods for Hydrodynamic Parameters of Overland Sediment Flow
投稿时间:2018-08-19  
DOI:10.13870/j.cnki.stbcxb.2019.01.005
中文关键词: 薄层含沙水流  水动力学  非常规比尺模型  相似性
英文关键词: overland flow  hydrodynamic  non-conventional scale  similarity
基金项目:国家重点研发计划项目(2017YFC0504703);陕西省自然科学基金重大基础研究项目(2016ZDJC-20);国家自然科学基金项目(41877078,41371276);水土保持研究所中国科学院创新工程重要方向项目(A315021615)
作者单位E-mail
尹艳1, 高建恩1,2, 李慧娟2, 韩赛奇1, 周媚芳3 1. 西北农林科技大学水土保持研究所, 陕西 杨凌 712100

2. 中国科学院水利部水土保持研究所
, 陕西 杨凌 712100

3. 西北农林科技大学水利与建筑工程学院
, 陕西 杨凌 712100 
gaojianen@126.com 
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中文摘要:
      针对坡面径流水深浅(1~5 mm)和水动力学参数(流速、水深等)提取困难,给坡面侵蚀径流水流结构、能量耗散及泥沙输移等的深入研究带来困难的问题,基于水动力学原理和相似性理论,通过"非常规比尺模型"将径流水深进行放大,来研究坡面薄层含沙水流的水流相似过程。结果表明:(1)当薄层含沙水流水深放大2.5倍,含沙量在10~320 kg/m3时,薄层含沙水流原型和模型的水面线(阻力)、流速、侵蚀地形的误差分别为0~0.1%,0.1%~5.3%,0.9%~4.9%,误差均在允许范围之内,原型和模型满足几何、运动等相似比尺转换关系;(2)水深在0.5~1.25 cm时,薄层含沙水流为紊流,原型和模型的流速垂向分布满足对数分布,可以用同一方程进行表达;(3)"非常规比尺模型"可以作为一种方法应用到薄层含沙水流的水动力学参数提取、水流结构、能量耗散、泥沙输移等的深入研究过程中。
英文摘要:
      Due to the difficulty of extracting runoff depth (1~5 mm) and hydrodynamic parameters (velocity, depth, etc), it is difficult to study the water flow structure, energy dissipation and sediment transport of runoff erosion on slope surface. Based on the principle of hydrodynamics and similarity theory, the flow similarity process of overland sediment flow on slope surface was simulated by enlarging the depth of runoff with non-conventional scale model. The results were as follows:(1) When the water depth of overland sediment flow was enlarged by 2.5 times and sediment content was 10~320 kg/m3, the errors of surface line (resistance), velocity and erosion topography from the prototype and model of overland sediment flow were 0~0.1%, 0.1%~5.3% and 0.9%~4.9%, respectively, all the errors of which were within the allowable ranges. The prototype and the model fitted the similarity transform relationship, such as geometry and motion. (2) When the water depth was 0.5~1.25 cm, the overland sediment flow was turbulent, the vertical distribution of velocities of the prototype and the model fitted the logarithmic distribution, which could be expressed by the same equation. (3) The non-conventional scale model could be used for the further studies of hydrodynamic parameters extraction, flow structure, energy dissipation and sediment transport of the overland sediment flow.
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