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首页> 外文期刊>Estuarine Coastal and Shelf Science >Modeling sand-mud transport induced by tidal currents and wind waves in shallow microtidal basins: Application to the Venice Lagoon (Italy)
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Modeling sand-mud transport induced by tidal currents and wind waves in shallow microtidal basins: Application to the Venice Lagoon (Italy)

机译：模拟潮汐流和风浪在浅微潮盆地中引起的泥浆运移：在威尼斯泻湖中的应用（意大利）

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摘要

In this study we present a mathematical model for sediment entrainment, transport and deposition caused by the combined action of tidal currents and wind waves in shallow micro-tidal basins. The model uses a bi-granular mixture made up of cohesive and non-cohesive sediments thus considering clay, silt and sand, all of which commonly characterize the sediment bed composition of estuaries and tidal basins. The model also describes the evolution of bed elevation and evaluates the variation of bed sediment composition distinguishing cohesive from non-cohesive behavior. A stochastic approach is proposed to evaluate sediment entrainment close to incipient sediment motion. Particular attention is also given to the problem of reconstructing a reliable initial bed composition as this has a significant impact on sediment entrainment. The model was applied to the test case of the Venice lagoon (Italy) and good agreement was found when comparing model results to a series of turbidity measurements collected inside the lagoon. The model was then used to predict the actual net amount of sand and mud flowing through the inlets and the bottom evolution in terms of elevation and composition.
机译：在这项研究中，我们为浅层微潮盆地中潮流和风浪的共同作用引起的泥沙夹带，运移和沉积提供了数学模型。该模型使用由粘性和非粘性沉积物组成的双颗粒混合物，因此考虑了粘土，粉砂和沙子，所有这些通常代表着河口和潮汐盆地的沉积物床组成。该模型还描述了床高程的演变，并评估了区分粘性和非粘性行为的床沉积物组成的变化。提出了一种随机方法来评估接近初始泥沙运动的泥沙夹带。还特别关注了重建可靠的初始床层组成的问题，因为这对夹带泥沙有重大影响。将该模型应用于威尼斯泻湖（意大利）的测试案例，将模型结果与泻湖内部收集的一系列浊度测量值进行比较时，发现了很好的一致性。然后，使用该模型来预测流经入口和底部演变的实际沙尘净量（根据海拔高度和组成）。

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