水科学进展2017，Vol.28Issue(3)：338-345,8.DOI:10.14042/j.cnki.32.1309.2017.03.003
推移质输沙对阶梯-深潭系统消能的影响
Effect of bed load transport on the energy dissipation of step-pool system
摘要
Abstract
Step-pool system is a typical bed micro-morphology in high gradient mountain rivers, which creates extremely high turbulence intensity and thus dissipates a majority the flow energy.The increase of the bed load transport intensity changed the flow field and reshaped the bedform, thus the energy dissipation effect of the step-pool system changed.A physical model of artificial step-pool system was constructed in a locally regular channel of the upper Wenxia River, a tributary of Han River in the middle Yangtze River.Experiments were conducted to study the flow field and energy dissipation in different flow discharges and bed load transport rates.Experimental results illustrated that the increase of bed load transport intensity significantly changed local flow field in the step and pool.The turbulence intensity on the step increased and the turbulence intensity in the pool decreased sharply.The increase of bed load transport intensity leaded to variation of the energy dissipation distribution.The energy dissipated by bed load transport increased, thus the energy dissipation effect of the bed structure of step-pool system decreased and the pool of the step-pool system was filled up.关键词
阶梯-深潭系统/推移质输沙/山区河流/消能/野外试验Key words
step-pool system/bed load transport/mountain stream/energy dissipation/field experiment分类
建筑与水利引用本文复制引用
李文哲,李志威,王兆印..推移质输沙对阶梯-深潭系统消能的影响[J].水科学进展,2017,28(3):338-345,8.基金项目
水利部黄河泥沙重点实验室开放课题基金资助项目(2017005) （2017005）
国家自然科学基金资助项目(91547112)The study is financially supported by the National Natural Science Foundation of China (No.91547112). （91547112）
