摘要
河流上修建枢纽工程将改变下游河道来水来沙条件,并导致河流再造床过程。本文通过室内概化水槽实验研究了清水下泄时河道比降、入流角、流量及河床组成等因素影响河流再造床过程中河型变化的规律。研究发现,对于一定的河床组成,如果控制河槽的冲刷下切,当入流角为0时,随着比降、流量的增加,初始顺直的河槽将会展宽增大湿周从而降低消耗,河槽宽深比随比降、流量的增加而增大,随组成河床颗粒粒径的减小而增加;当入流角大于0时,随着比降的增加,初始顺直的河槽一方面增大宽深比,同时呈现弯曲特征,在一定的比降、流量及河床组成条件下,将形成具有明显弯曲特征的主槽。
The changing of flow condition caused by construction of hydro projects will result in river reformation and development of river pattern downstream of the reservoir.In this paper,the development of river pattern in the process of reformation is studied by means of flume experiment and the influences of river slope,angle between main flow and thalweg,discharge and grain size of river bed material are analyzed according to the experimental data and theory.It is found that the channel will be widened as the river slope or discharge increases and grain size decreases,if the angle between main flow and thalweg is zero.In case the angle is not zero,under certain conditions of grain size of bed material and discharge,a most suitable slope exists,for which the river will develop into a pattern of meandering.
出处
《水利学报》
EI
CSCD
北大核心
2003年第7期42-45,51,共5页
Journal of Hydraulic Engineering
基金
国家自然科学基金项目(50079018)
博士点基金项目
三峡"九五"课题(95-1-6)资助
关键词
再造床
河型
河道演变
侵蚀基准
reformation process
river pattern
alluvial process
datum plane of erosion
