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黄丘区坡面细沟流速分布特征试验研究
引用本文:张攀,姚文艺,魏鹳举,肖培青.黄丘区坡面细沟流速分布特征试验研究[J].水利学报,2017,48(11):1334-1340.
作者姓名:张攀  姚文艺  魏鹳举  肖培青
作者单位:黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室, 河南 郑州 450003,黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室, 河南 郑州 450003,青海大学 水利电力学院, 青海 西宁 810016,黄河水利科学研究院水利部黄土高原水土流失过程与控制重点实验室, 河南 郑州 450003
基金项目:国家自然科学基金项目(51409110),河南省创新型科技人才队伍建设工程(162101510004)
摘    要:利用坡面水蚀精细模拟降雨试验,对黄丘区陡坡(20°)条件下细沟流速分布特征进行了研究。通过对细沟形态演变过程的观察与分析,同时结合试验中对细沟间及细沟内流速的观测,给出了细沟发育过程中坡面流速沿程分布以及细沟内关键位置的流速分布。结果表明,细沟间流速分布基本不受细沟发育程度的影响,而细沟内水流流速与细沟发育过程之间存在互馈关系,首先坡面漫流向集中股流的转化促使细沟发育,会导致细沟内流速的增加,但随着细沟的进一步发展,汇流面积减小,沟床形态阻力及沟底跌坎消能作用增大,细沟流速又会逐渐减小,沟床形态阻力与径流集中产生的流速增量二者间的相互对比关系影响着细沟内水流速度。

关 键 词:黄土坡面  细沟侵蚀  形态演变  坡面流速
收稿时间:2017/5/24 0:00:00

Experimental study of the velocity profile of rill in the loess region
ZHANG Pan,YAO Wenyi,WEI Guanju and XIAO Peiqing.Experimental study of the velocity profile of rill in the loess region[J].Journal of Hydraulic Engineering,2017,48(11):1334-1340.
Authors:ZHANG Pan  YAO Wenyi  WEI Guanju and XIAO Peiqing
Affiliation:Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China,Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China,College of Water Resources and Electric Power, Qinghai University, Xining 810016, China and Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
Abstract:The flow velocity distribution under the condition of steep slope (20°) is studied by using the method of indoor fine simulated rainfall experiment. Through the observation and analysis of the rill morphology evolution and the overland flow velocity during the experiment, the variation rule of the flow velocity during the rill formation and development was studied. The results show that the overland flow velocity between the rills is not affected by the degree of rill development, but there is a relationship between the flow velocity within the rill and the rill development. First, the emergence of the rill will lead to an increase of runoff in the rill,but with the rill development,the confluence area decreases,the rill bed morphological resistance increases,resulting in the gradual decrease of the rill flow velocity. The reciprocal contrast between the rill bed morphological resistance and the flow velocity increment caused by runoff concen-tration affects the flow velocity in the rill.
Keywords:loess slope  rill erosion  morphology evolution  overland flow velocity
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