Estimation of the Longitudinal Dispersion Coefficient using the Velocity Profile in Natural Streams
Estimation of the Longitudinal Dispersion Coefficient using the Velocity Profile in Natural Streams
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DOI：
10.1061/(asce)0733-9429(2004)130:3(227
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发表时间：
2004-02
影响因子：
2.4
通讯作者：
I. Seo;K. Baek
中科院分区：
文献类型：
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作者：
I. Seo;K. Baek
本研究根据天然水流横向流速分布，提出一种预测纵向弥散系数的理论方法。分析了天然河流不规则断面的横向流速分布方程。在本研究中测试的速度剖面方程，β分布方程，这是一个概率密度函数，被认为是最合适的模型来解释不规则的天然流的横向速度结构的复杂行为。基于横向速度分布的β函数，推导了新的纵向弥散系数方程。与现有的方程和观测到的纵向色散系数的比较表明，建议的方程显示出更好的协议与观测数据相比，其他现有的方程。
In this study, a theoretical method for predicting the longitudinal dispersion coefficient is developed based on the transverse velocity distribution in natural streams. Equations of the transverse velocity profile for irregular cross sections of the natural streams are analyzed. Among the velocity profile equations tested in this study, the beta distribution equation, which is a probability density function, is considered to be the most appropriate model for explaining the complex behavior of the transverse velocity structure of irregular natural streams. The new equation for the longitudinal dispersion coefficient that is based on the beta function for the transverse velocity profile is developed. A comparison of the proposed equation with existing equations and the observed longitudinal dispersion coefficient reveals that the proposed equation shows better agreement with the observed data compared to other existing equations.