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首页> 外文期刊>Applied Ocean Research >Application of parameters and paradigms of the erosion and deposition for cohesive sediment transport modelling in the Lingdingyang Estuary, China
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Application of parameters and paradigms of the erosion and deposition for cohesive sediment transport modelling in the Lingdingyang Estuary, China

机译：参数和范式的应用沉积和沉积对岭阳河河口沉积物运输建模的应用

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摘要

Suspended sediment and the surficial sediment in most estuaries throughout the world consist of fine particles. Modelling cohesive sediment transport is an important way to explore the morphological evolution of estuaries where cohesive sediment is dominant. Various values for critical shear stress and deposition paradigms for cohesive sediment transport were evaluated here by analysis of field samples combined with numerical simulation in the Lingdingyang (LD) estuary in China. A UMCES-Gust Erosion Microcosm System (U-GEMS) experiment using field samples suggests that the experimental average value of critical shear stress for erosion (tau(ce)) is 0.26 N/m(2). Two conflicting paradigms, i.e. mutually exclusive versus simultaneous erosion and deposition, are commonly used for cohesive sediment transport. Simulations of tidal currents and sediment transport during the wet season of 2007 and dry season of 2016 in the LD estuary were conducted under these two paradigms using the TELEMAC-2D hydrodynamic module and the sediment module SISYPHE in the TELEMAC model. Model verification under these two paradigms was carried out, and the tau(ce) parameters in the TELEMAC model were revised based on a U-GEMS experiment. The results showed the following. (1) The simulation results of the model in the LD estuary were satisfactory when an experimental average tau(ce) value of 0.26 N/m(2) was used. (2) The simultaneous paradigm using a tau(ce) value of 0.26 N/m(2) well explained the changes in the field-observed depth-averaged suspended sediment concentrations under all tidal regimes during the dry season, whereas the simultaneous paradigm using a tau(ce) of 0.15 N/m(2) was more similar to observations in the LD estuary during the wet season.
机译：悬浮沉积物和整个世界上大多数河口的表观沉积物由细颗粒组成。建模粘性沉积物运输是探讨河口沉积物占主导地位的河口形态演化的重要途径。这里通过分析中国在中国凌丁阳（LD）河口中的数值模拟结合数值模拟，在此评估临界剪切应力和沉积沉积物转运的各种值。使用现场样品的UM-GUST侵蚀微观系统（U-GEMS）实验表明侵蚀临界剪切应力的实验平均值（TAU（CE））为0.26n / m（2）。两个冲突的范式，即相互排他性与同时侵蚀和沉积，通常用于粘性沉积物运输。 2007年潮湿季节和2016年潮汐季节的潮汐电流和沉积物的模拟在这两种范例中，通过Telemac-2D流体动力模块和Telemac模型中的沉积物模块Sisyphe在这两种范例下进行了LD河口。在这两个范式下进行了模型验证，并根据U-Gems实验修订了TELEMAC模型中的TAU（CE）参数。结果表明以下。 （1）使用0.26n / m（2）的实验平均TAU（CE）值时，LD河口模型的模拟结果令人满意。 （2）使用TAU（CE）值的同时范式0.26n / m（2）康复地解释了在干燥季节的所有潮汐制度下的现场观察到的深度平均悬浮沉积物浓度的变化，而同时帕拉维斯使用0.15n / m（2）的Tau（Ce）更类似于潮湿季节的LD河口的观察。

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