摘要
对不同流态及流区明渠水流阻力系数的计算公式进行总结。考虑到指数型表达式在进行数学推导及应用时较其他形式更为方便,基于该形式并结合尼古拉兹管流试验资料,推导了各流态及流区明渠阻力系数的具体表达式且得到实测资料的验证。推导过程中,借助明渠当量直径实现管流与明渠阻力系数的相互转换,并依据各流区水流特征的不同,对Christoffersen和Jonson提出的糙率高度公式作了不同简化。将所得阻力系数公式应用于河流及海洋近岸水流挟沙力的计算中,结果表明实测值与计算值相吻合,且所有流区阻力系数表达式形式的统一有利于水流挟沙力计算的简便。
Computation formulas of open channel flow resistance coefficient in different flow conditions or regions are summarized. Considering the exponential expression is more convenient in formula derivation and application than other forms, the specific computational expressions of open channel resistance coefficient in different flow conditions based on this expression type with the Nikuradse＇ experimental data are derived. The results are verified by measured data of open channel. In the derivation processes, transform the pipe and open channel flow resistance coefficient through equivalent diameter and simplify the roughness height formula put forward by Cbristoffersen and Jonson according to different flow characteristics in different regions. The resistance coefficient formulas are applied to the flow sediment-carrying Capacity computation in rivers and near-shore areas, and the results agree well to the measured data. The unification of the expression type in all regions can make the sediment-carrying capacity computation more convenient.
出处
《泥沙研究》
CSCD
北大核心
2016年第2期7-13,共7页
Journal of Sediment Research
基金
国家海洋局海洋公益性行业科研专项项目(201205005)
国家自然科学基金项目(41276017)
江苏省基础研究计划(自然科学基金)青年基金项目(BK20130409)
江苏省高校自然科学研究面上项目(13KJB570001)
关键词
明渠
阻力系数
雷诺数
挟沙力
open channel
resistance coefficient
Reynolds number
sediment-carrying capacity
