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首页> 外文期刊>Estuarine Coastal and Shelf Science >New analytical equation for dispersion in estuaries with a distinct ebb-flood channel system
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New analytical equation for dispersion in estuaries with a distinct ebb-flood channel system

机译：具有独特的潮洪通道系统的河口扩散新解析方程

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Tidal pumping caused by residual horizontal circulation is an important but ill-understood mechanism producing longitudinal salt dispersion in well-mixed estuaries. There are two types of residual circulation that cause tidal pumping: (1) interaction of the tidal flow with a pronounced flood-ebb channel system; and (2) interaction of the tidal flow with an irregular bathymetry. Residual ebb-flood channel circulation is an important large-scale mixing mechanism for salinity intrusion, as shown in the Western Scheldt in the Netherlands, which is a well-mixed estuary with a distinct ebb-flood channel system. This paper provides a new simplified conceptual model and a new analytical equation for this type of mixing. Firstly, using a fully three-dimensional hydrodynamic model as a "virtual laboratory" and employing a decomposition method, the characteristics of the residual ebb-flood channel circulation in the Western Scheldt are analysed. Secondly, a conceptual model and an analytical equation determining the dispersion coefficient are developed, which take into account relevant parameters for tidal pumping, such as the tidal pumping efficiency, the tidal excursion and the length of the branches. Subsequently, the newly . developed equation is compared to the results of the "virtual laboratory". The comparison confirms an agreement between the newly developed equation and the "virtual laboratory" in determining the residual transport and the tidal pumping dispersion coefficient. Finally, the equation is applied to observations in the Western Scheldt. The application yields good results in determining the longitudinal dispersion compared to dispersion values obtained from the salt budget.
机译：由残余水平循环引起的潮汐抽水是重要的但机制仍不为人所知，但在充分混合的河口中会产生纵向盐分弥散。导致潮汐泵送的残余循环有两种类型：（1）潮汐流与明显的洪水-退潮通道系统的相互作用； （2）潮汐流与不规则测深的相互作用。残留的潮汐通道循环是盐度入侵的重要的大规模混合机制，如荷兰的Western Scheldt所示，这是一个混合良好的河口，具有独特的潮汐通道系统。本文为这种混合提供了一个新的简化概念模型和一个新的解析方程。首先，使用全三维流体动力学模型作为“虚拟实验室”并采用分解方法，分析了Western Scheldt地区残余的潮汐通道环流的特征。其次，建立了一个概念模型和一个确定弥散系数的解析方程，其中考虑了潮汐抽水的相关参数，例如潮汐抽水效率，潮汐偏移和分支的长度。随后，新。将已开发的方程式与“虚拟实验室”的结果进行比较。通过比较，可以确定新开发的方程式与“虚拟实验室”之间在确定残留迁移率和潮汐抽水弥散系数方面的一致性。最后，该方程式适用于Western Scheldt的观测。与从盐预算获得的色散值相比，该应用在确定纵向色散方面产生了良好的结果。

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