Numerical modelling of the suspended particulate matter dynamics in a regulated river network

Launay, M.; Dugué, Violaine; Faure, J.; Coquery, Marina; Camenen, B.; Coz, Jérôme Le

doi:10.1016/j.scitotenv.2019.02.015

Cited by 21 publications

(21 citation statements)

References 44 publications

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“…The Rhône accounts for the highest mean annual discharge (ca. 1700 m 3 s -1 ) into the Western Mediterranean basin (Launay et al, 2019), including 95% of suspended particulate matter (SPM) fluxes to the French Mediterranean coast (Sadaoui et al, 2016) and 50% of GoL primary production (Lochet and Leveau, 1990). The Mediterranean Se ' very low tidal range allows the Rhône riverine plume to expand westwards into the GoL (Boudet et al, 2017;Many et al, 2018).…”

Section: Study Areamentioning

confidence: 99%

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

Chouvelon

Strady

Harmelin-Vivien

et al. 2019

Marine Pollution Bulletin

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives| 4.0 International License

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Section: Study Areamentioning

confidence: 99%

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

Chouvelon

Strady

Harmelin-Vivien

et al. 2019

Marine Pollution Bulletin

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“…As shown in Figure 1, 3.5 km downstream of the confluence the Rhône River 10.1029/2019WR026367 splits into two channels, the dammed, bypassed Old Rhône and the navigation canal with a hydropower plant. More than 15 similar bifurcations exist along the Rhône River between Lake Geneva and the Mediterranean Sea (Dugué et al, 2015;Launay et al, 2019). A traditional 1-D model would compute different discharges, Q right and Q left , for the two downstream branches but both concentrations would be equal to each other and equal to the cross-sectional average concentration upstream of the bifurcation.…”

Section: Application To the Improvement Of 1-d Modelsmentioning

confidence: 99%

“…In river engineering applications, 1‐D or 2‐D hydrodynamic models are commonly used to predict pollutant fate and dynamics by solving the shallow water equations coupled with the advection‐diffusion equation for solutes or suspended particulate matter (SPM; e.g., Beltaos & Arora, 1988; Launay et al, 2019). One‐dimensional models are especially useful for simulations over large river domains (e.g., El Kadi Abderrezzak et al, 2015; Launay et al, 2019). However, 1‐D hydrodynamic models coupled with the 1‐D advection‐diffusion equation consider only cross‐section averaged concentrations and assume complete mixing to occur instantaneously at each confluence.…”

Section: Introductionmentioning

confidence: 99%

Predicting Transverse Mixing Efficiency Downstream of a River Confluence

Pouchoulin

Coz

Mignot

et al. 2020

Water Resources Research

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Predicting mixing processes, especially transverse mixing, downstream of river confluences, is necessary for assessing and modeling the fate of pollutants transported in river networks, but it is still challenging. Typically, there is a lack of transverse mixing solutions implemented in 1-D hydrodynamical models widely used in river engineering applications. To investigate the mixing processes developing downstream of a medium-sized river confluence, three high-resolution in situ surveys are conducted at the Rhône-Saône confluence in France, based on geolocated specific conductivity and hydroacoustic measurements. Contrasting mixing situations are observed depending on hydrological conditions. In some cases, the two flows mix slowly due to turbulent shear at their vertical interface. This can be modeled by an analytical solution of the advection-diffusion equation. In other cases, the waters from one of the two tributaries move under the waters of the other tributary. The induced local circulation enhances transverse mixing but not vertical mixing and the flow remains stratified vertically, which may be missed when surface or satellite images are analyzed qualitatively. Stratification may be predicted by comparing the time scales for shear and density-driven adjustment. Shear-dominated transverse mixing of depth-averaged concentrations can be predicted analytically and implemented in 1-D hydrodynamical models. However, the initiation of apparently rapid transverse mixing due to density-driven circulation remains to be better understood and quantified. Plain Language Summary Predicting how waters mix downstream of river confluences is necessary for assessing and modeling the fate of pollutants transported in river networks, but it is still challenging. Typically, there is a lack of transverse mixing solutions implemented in models widely used in river engineering applications. To investigate the mixing processes developing downstream of a medium-sized river confluence, three high-resolution in situ surveys are conducted at the Rhône-Saône confluence in France. Contrasting slow or rapid mixing situations are observed depending on hydrological conditions. The transverse mixing of depth-averaged concentrations can be predicted analytically and implemented in 1-D hydrodynamical models. However, the initiation of rapid transverse mixing due to difference in fluid density remains to be better understood and quantified.

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“…In addition, other codes such as GSTARS3 have been successfully used to simulate the long-term longitudinal profile by Nohani and Afrous [36]. Launay et al [37] simulated the spatial and temporal dynamics of suspended particulate matter during floods. For this long-term simulation, they used the Rhone 1-D model.…”

Section: Simulation Of Longitudinal Sediment Profile In Reservoirsmentioning

confidence: 99%

“…The SRH-2D code was also used to simulate the bypass tunnel for the Yellowstone river intake by Sixta et al [22]. Amini et al [32] HEC-RAS Mohammad et al [33] HEC-RAS Castillo et al [34] HEC-RAS Nohani and Afrous [36] GSTARS3 Launay et al [37] RS3Rhône 1-D…”

Section: Route Sediments To Maintain Transport and Minimize Depositionmentioning

confidence: 99%

Elements for the Successful Computer Simulation of Sediment Management Strategies for Reservoirs

Anari

Hotchkiss

Langendoen

2020

Water

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Computer simulation of reservoir sediment management strategies is becoming more important as worldwide water supply shrinks due to sediment deposition, while population growth continues. We identified the physical processes underlying each of the several alternatives available to transport incoming or deposited sediments downstream into receiving waters and the governing equations that describe each process. The purpose of this paper is to understand how physical characteristics of reservoir sediment management can be simulated with available computer codes. We described commonly available computer codes and their abilities to solve the appropriate equations in one, two, or three dimensions. The results revealed that one dimensional models are most appropriate for long-term simulations of the evolving reservoir bottom profile, while two or three dimensional codes are more appropriate for simulating density currents and detailed lateral movement of sediments, such as during local pressure flushing near reservoir outlets. We conclude that existing codes can successfully simulate sediment management, but because each code has limitations, they require seasoned judgment in their choice, application, and interpretation. Incorporating sediment prediction and management correctly into the planning, design, and operational phases of dam projects is essential for ensuring that the benefits of reservoir storage are sustained over the long term. The implications of our key findings are that sediment management strategies can be successfully simulated and that such simulations should be performed for our aging dams and newly proposed projects.

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Numerical modelling of the suspended particulate matter dynamics in a regulated river network

Cited by 21 publications

References 44 publications

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web

Predicting Transverse Mixing Efficiency Downstream of a River Confluence

Elements for the Successful Computer Simulation of Sediment Management Strategies for Reservoirs

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