Stream Velocity Profiles and Longitudinal Dispersion
Stream Velocity Profiles and Longitudinal Dispersion
复制标题
DOI：
10.1061/(asce)0733-9429(1997)123:9(816
复制
发表时间：
1997-09
影响因子：
2.4
通讯作者：
G. Bogle
中科院分区：
文献类型：
--
作者：
G. Bogle
从萨克拉门托三角洲，北方加州，横截面的速度分布测量进行了分析，以提取值的参数，纵向分散的特点。这些参数是速度偏差强度比和由速度剖面通过三重积分导出的无量纲常数。费舍尔估计这些参数相结合的实验室测量，理论推导的理想情况下，和数据从真实的流。本文提出的结果表明，费舍尔使用的参数值可能会导致显着的过度预测的分散在三角洲通道。考虑到未来的数值模拟，定义了一个四次剖面函数，并表明它可以提供一个合理的横向速度剖面测量模型。
Cross-sectional velocity distribution measurements from the Sacramento Delta, Northern California, have been analyzed in order to extract values of the parameters that characterize longitudinal dispersion. These parameters are the velocity deviation intensity ratio and a dimensionless constant derived from the velocity profile by triple integration. Fischer estimated these parameters by combining laboratory measurements, theoretical derivations for ideal cases, and data from real streams. The results presented in this paper show that the parameter values used by Fischer may lead to a significant overprediction of dispersion in the delta channels. With a view to future numerical modeling, a quartic profile function was defined and shown to provide a reasonable model of measured transverse velocity profiles.