Finite-volume coupled surface-subsurface flow modelling in earth dikes

IF 1.7 3区工程技术 Q3 ENGINEERING, CIVIL

Journal of Hydraulic Research Pub Date : 2023-09-03 DOI:10.1080/00221686.2023.2246936

Nathan Delpierre, Hadrien Rattez, Sandra Soares-Frazao

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引用次数: 0

Abstract

AbstractEarthen embankments are subjected to increasing threats because of climate change inducing sequences of severe drought periods followed by floods, possibly leading to overtopping of the structures. Consequently, the water saturation of the dike can vary significantly both in space and time, and the resulting groundwater flow can affect the free-surface flow in case of overtopping. Conversely, the free-surface flow can modify the pore water content, which controls erosion and slope instabilities. In this paper, a combined approach to such situations is presented, in which the degree of saturation and the flow through the embankment are simulated by solving the two-dimensional Richards equation on an unstructured mesh with an implicit finite volume scheme that is coupled to the system of shallow-water equations solved in one dimension using an explicit finite-volume scheme. The coupled model is validated on several situations of flows through and over earthen embankments with different constitutive materials.Keywords: Embankmentfinite volumenumerical simulationovertopping flowsRichards equationshallow-water equations Disclosure statementNo potential conflict of interest was reported by the author(s).

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土坝的有限体积地表-地下耦合流动模拟

由于气候变化引发的严重干旱期和随后的洪水序列，可能导致结构的超载，因此堤防受到越来越大的威胁。因此，堤防的含水饱和度在空间和时间上都有很大的变化，由此产生的地下水流动在漫顶情况下会影响自由地表流动。相反，自由表面流动可以改变孔隙含水量，从而控制侵蚀和边坡不稳定。在本文中，提出了一种针对这种情况的组合方法，其中通过在非结构化网格上求解二维Richards方程来模拟饱和程度和通过路堤的流量，该方程具有隐式有限体积格式，该格式与使用显式有限体积格式在一维中求解的浅水方程系统相耦合。在不同本构材料土路堤流过和流过的几种情况下，对耦合模型进行了验证。关键词:堤岸;有限体积;数值模拟;漫流;理查兹方程;

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来源期刊

Journal of Hydraulic Research 工程技术-工程：土木

CiteScore

4.90

自引率

4.30%

发文量

审稿时长

6.6 months

期刊介绍： The Journal of Hydraulic Research (JHR) is the flagship journal of the International Association for Hydro-Environment Engineering and Research (IAHR). It publishes research papers in theoretical, experimental and computational hydraulics and fluid mechanics, particularly relating to rivers, lakes, estuaries, coasts, constructed waterways, and some internal flows such as pipe flows. To reflect current tendencies in water research, outcomes of interdisciplinary hydro-environment studies with a strong fluid mechanical component are especially invited. Although the preference is given to the fundamental issues, the papers focusing on important unconventional or emerging applications of broad interest are also welcome.