An implicit wetting–drying algorithm for the discontinuous Galerkin method: application to the Tonle Sap, Mekong River Basin

Le, Hoang Anh; Lambrechts, Jonathan; Ortleb, Sigrun; Gratiot, Nicolas; Deleersnijder, Éric; Frazao, Sandra Soares

doi:10.1007/s10652-019-09732-7

Cited by 16 publications

(16 citation statements)

References 48 publications

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“…To date, very few 2D hydraulic modelling packages have adopted DG-based solvers, of which DG-SWEM (Bunya et al, 2009;Kubatko et al, 2006), SLIM (Lambrechts et al, 2010) and Thetis (Kärnä et al, 2018) are two examples. Existing DG-based solvers have been primarily aimed to support modelling applications in lake, estuary and coastal systems (Le Bars et al, 2016;Clare et al, 2020;Le et al, 2020;Mulamba et al, 2019;Pham Van et al, 2016;Wood et al, 2020). However, the application of DG2 for 2D flood inundation modelling has been little explored, and a dedicated study is needed to identify: (i) the optimal DG2 configuration for flood modelling applications, and (ii) the potential capabilities of DG2 compared to commonly used FV-based alternatives, including FV-based industry-standard models.…”

Section: Introductionmentioning

confidence: 99%

Second-order discontinuous Galerkin flood model: Comparison with industry-standard finite volume models

Ayog

Kesserwani

Shaw

et al. 2021

Journal of Hydrology

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Section: Introductionmentioning

confidence: 99%

Second-order discontinuous Galerkin flood model: Comparison with industry-standard finite volume models

Ayog

Kesserwani

Shaw

et al. 2021

Journal of Hydrology

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“…1 ). This was due to omitting major TSL tributaries such as the Stung Sen in the boundary, which expand significantly during the wet season 48 .…”

Section: Methodsmentioning

confidence: 99%

Projected plastic waste loss scenarios between 2000 and 2030 into the largest freshwater-lake system in Southeast Asia

Finnegan

Gouramanis

2021

Sci Rep

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Freshwater plastic pollution is critically understudied in Southeast Asia (SEA). Recent modelling studies indicate that SEA rivers contribute vast quantities of plastic to the world’s oceans, however, these fail to capture the complexity of individual systems. We determine the volume of mismanaged plastic waste (MPW) entering Tonle Sap Basin (TSB)—the largest freshwater lake–river system in SEA, between 2000 and 2030. Using economic, population and waste data at provincial and national levels, coupled with high resolution population and flood datasets, we estimate that ca. 221,700 tons of plastic entered between 2000 and 2020, and 282,300 ± 8700 tons will enter between 2021 and 2030. We demonstrate that policy interventions can reduce MPW up to 76% between 2021 and 2030. The most-stringent scenario would prevent 99% of annual MPW losses by 2030, despite substantially higher waste volumes and population. If successfully implemented, Cambodia will prevent significant losses in natural capital, material value and degradation in TSB worth at least US$4.8 billion, with additional benefits for the Mekong River and South China Sea.

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“…where 𝑼 = 𝐻𝒖 ̅ is the horizontal transport, H is the water column height, h is the bathymetry, t is the time, and 𝒖 ̅ = (u,𝑣) is the depth-averaged horizontal velocity. 𝛼 is a constant that is set to zero over dry elements and one over wet elements (Le et al, 2020),  is the horizontal gradient operator, 𝑔 = 9.81 m/s 2 is the gravitational acceleration, Cd is the bulk drag coefficient, f is the Coriolis parameter, 𝒆 𝒛 is the vertical unit vector pointing upward, 𝜐 is the horizontal eddy viscosity, 𝜏 𝑤𝑖𝑛𝑑 is the wind stress, and 𝛻p 𝑎𝑡𝑚 is the atmospheric pressure gradient.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

Modeling interactions between tides, storm surges, and river discharges in the Kapuas River delta

Sampurno

Vallaeys

Ardianto³

et al. 2021

Preprint

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Abstract. The Kapuas River delta is a unique estuary system on the west coast of Borneo Island, Indonesia. Its hydrodynamics is driven by an interplay between storm surges, tides, and rivers discharge. These interactions are likely to be exacerbated by global warming, leading to more frequent compound flooding in the area. The mechanisms driving compound flooding events in the Kapuas River Delta remain, however, poorly known. Here we attempt to fill this gap by assessing the interactions between river discharges, tides, and storm surges and how they can drive a compound inundation over the riverbanks, particularly within Pontianak, the main city along the Kapuas River. We simulated these interactions using the multi-scale hydrodynamic model SLIM. Our model correctly reproduces the Kapuas River’s hydrodynamics and its interactions with tides and storm surge from the Karimata Strait. We considered several extreme scenario test cases to evaluate the impact of tide-storm-discharge interactions on the maximum water level profile from the river mouth to the upstream part of the river. Based on the maximum water level profiles, we could divide the main branch of the Kapuas River’s stream into three zones, i.e., the tidally-dominated region (from the river mouth to about 4 km upstream), the mixed-energy region (from about 4 km to about 30 km upstream) and the river-dominated region (beyond 30 km upstream). Thus, the local water management can define proper mitigation for handling compound flooding hazards along the riverbanks by using this zoning category. The model also successfully reproduced a compound inundation event in Pontianak, which occurred on 29 December 2018. For this event, the wind-generated surge appeared to be the dominant trigger.

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An implicit wetting–drying algorithm for the discontinuous Galerkin method: application to the Tonle Sap, Mekong River Basin

Abstract: Important note To cite this publication, please use the final published version (if applicable). Please check the document version above.

Cited by 16 publications

References 48 publications

Second-order discontinuous Galerkin flood model: Comparison with industry-standard finite volume models

Second-order discontinuous Galerkin flood model: Comparison with industry-standard finite volume models

Projected plastic waste loss scenarios between 2000 and 2030 into the largest freshwater-lake system in Southeast Asia

Modeling interactions between tides, storm surges, and river discharges in the Kapuas River delta

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