Although much effort has been expended on quantifying dispersion in simple channels, much less work has focused on compound channels, particularly for over-bank flows. Following an earlier study of a hypothetical compound channel, this paper provides further evidence for the significantly different flow dependence of dispersion coefficients for in-bank and over-bank conditions. The study is based on a natural cross-section of the River Severn, UK, and uses the same method as the earlier work, by combining the Shiono-Knight hydraulic model with the Fischer flow structure integral. The results show that dispersion coefficients are typically two orders of magnitude larger during over-bank flows compared to in-bank flows. Importantly, the maximum dispersion does not occur under the maximum flow. Instead, the maximum dispersion occurs when the flood plain inundation reaches the far edge of the flood plain.
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机译：虽然在简单的频道中耗费了很多努力，但在简单的渠道中的量化分散，但工作更少的工作集中在复合通道上，特别是对于过境流动。在对假设的复合通道的早期研究之后，本文提供了进一步的证据，用于对银行内和过境条件的分散系数显着不同的流动依赖性。该研究基于英国Severn River River的自然横截面，通过将Shiono-Knight液压模型与Fischer流结构的整体相结合，使用与较早的工作相同的方法。结果表明，与银行内流量相比，分散系数通常在过岸线流动期间较大的两个数量级。重要的是，在最大流量下不会发生最大分散。相反，当洪水淹没到达洪水平原的远沿时，发生最大分散。
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