全值域有定义的对数紊流流速分布公式研究  

Study on defined logarithmic turbulent velocity distribution formula in full value domain

作　　者：魏为 陈希炽 胡焰鹏 WEI Wei;CHEN Xichi;HU Yanpeng(Safety Center for River and Lake Protection,Construction and Operation,Changjiang Water Resources Commission,Wuhan 430010,China;Spatial Information Technology Application Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang Sanxia Investigation Bureau of Hydrology and Water Resources,Changjiang Water Resources Commission,Yichang 443000,China)

机构地区：[1]长江水利委员会河湖保护与建设运行安全中心,湖北武汉430010 [2]长江科学院空间信息技术应用研究所,湖北武汉430010 [3]长江水利委员会三峡水文水资源勘测局,湖北宜昌443000

出　　处：《水利水电快报》2024年第3期73-76,共4页Express Water Resources & Hydropower Information

摘　　要：目前,声学多普勒流速剖面仪垂线流速盲区插补只能采用指数流速分布、常数流速分布两种模式,而对数紊流流速分布公式是基于动量传递理论推导出的垂线流速分布公式,该公式因在边界处(y=0)没有定义而应用不便。基于此,从天然河道的河床是由泥沙组成的非固定边界的实际出发,提出在边界面上液体质点仍然存在混掺运动的假设,借助动量传递理论推导出全值域有定义的对数紊流流速分布公式。并且采用宜昌水文站4条实测垂线流速对公式进行拟合验证。结果表明:该公式拟合得到的误差有正有负,最大误差为-3.66%,精度符合水文资料整编规范要求。推导出的公式在垂线水深的所有值域内有定义,该公式可为声学多普勒流速剖面仪垂线流速盲区插补提供一种思路。For the exponential and constant flow velocity distribution of the current acoustic Doppler flow velocity profile,the formula for logarithmic velocity distribution based on Momentum Transportation Theory can not be used,because the formula has no definition when it is on the boundary(y=0).Based on the fact that the boundary of the natural river channel is not fixed and is consists of sediment,it assumed that liquid particles mixed on the boundary surface and then educed a formula of logarithmic turbulent velocity distribution defined full-value domains based on Momentum Transportation Theory.In addition,four measured vertical velocity of Yichang Hydrological Station were used to verify the formula.The results showed that the errors obtained by fitting the formula were positive and negative,with the maximum error of-3.66%,and the accuracy met the requirements of code for hydrological data processing.The formula defined all values of vertical water depth,and solved the problem of not defining a formula for the logarithmic turbulent velocity distribution at the boundary(y=0).The formula can provide a new thought other than the exponential and constant flow velocity distribution of the current acoustic Doppler flow velocity profile.

关 键 词：对数紊流流速分布 动量传递理论 垂线流速 宜昌水文站 

分 类 号：P332[天文地球—水文科学]