Evaluating lateral flow in an experimental channel using the diffusive wave inverse problem

Moussa, Roger; Majdalani, Samer

doi:10.1016/j.advwatres.2019.03.009

Cited by 9 publications

(5 citation statements)

References 46 publications

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“…In our paper, the one proposed by Moussa () has been selected because an analytical solution has been proposed to solve the inverse problem, as explained herein. Moreover recently, an experimental evaluation of the solution has been performed by Moussa and Majdalani () on a large variety of hydrograph scenarios. The model is based on Hayami assumptions, considering (a) diffuse lateral flows as uniformly distributed along the channel reach and (ii) the two C and D parameters as constant over time during the flood.…”

Section: Modelling Approachmentioning

confidence: 99%

Quantifying peakflow attenuation/amplification in a karst river using the diffusive wave model with lateral flow

Charlier

Moussa

David

et al. 2019

Hydrological Processes

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The aim of this paper is to quantify peakflow attenuation and/or amplification in a river, investigating lateral flow from the intermediate catchment during floods. This is a challenge for the study of the hydrological response of permeable/intermittent streams, and our contribution refers to a modelling framework based on the inverse problem for the diffusive wave model applied in a karst catchment. Knowing the upstream and downstream hydrographs on a reach between two stations, we can model the lateral one, given information on the hydrological processes involved in the intermediate catchment. The model is applied to 33 flood events in the karst reach of the Iton River in French Normandy where peakflow attenuation is observed. The monitored zone consists of a succession of losing and gaining reaches controlled by strong surface‐water/groundwater (SW/GW) interactions. Our results show that despite a high baseflow increase in the reach, peakflow is attenuated. Model application shows that the intensity of lateral outflow for the flood component is linked to upstream discharge. A combination of river loss and overbank flow for highest floods is proposed for explaining the relationships. Our approach differentiates the role of outflow (river loss and overbank flow) and that of wave diffusion on peakflow attenuation. Based on several sets of model parameterization, diffusion is the main attenuation process for most cases, despite high river losses of up to several m3/s (half of peakflow for some parameterization strategies). Finally, this framework gives new insight into the SW/GW interactions during floods in karst basins, and more globally in basins characterized by disconnected river‐aquifer systems.

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Section: Modelling Approachmentioning

confidence: 99%

Quantifying peakflow attenuation/amplification in a karst river using the diffusive wave model with lateral flow

Charlier

Moussa

David

et al. 2019

Hydrological Processes

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“…We chose this method as it provides consistent results, like those obtained with graphical approaches (results not shown). It can easily be automated and has only one β parameter, fixed at 0.91 after a trial-and-error analysis on the studied catchments and considering the results of Nathan and McMahon (1990) for 186 catchments.…”

Section: Appendix A: Hydrograph Decompositionmentioning

confidence: 99%

Impact of karst areas on runoff generation, lateral flow and interbasin groundwater flow at the storm-event timescale

Mesnil

Moussa

Charlier

et al. 2021

Hydrol. Earth Syst. Sci.

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Abstract. Karst development influences the hydrological response of catchments. However, such an impact is poorly documented and even less quantified, especially over short scales of space and time. The aim of this article is thus to define karst influence on the different hydrological processes driving runoff generation, including interbasin groundwater flow (IGF) for elementary catchments at the storm-event timescale. IGFs are estimated at the scale of the river reach, by comparing inlet and outlet flows as well as the effective rainfall from the topographic elementary catchment. Three types of storm-event descriptors (characterizing water balance, hydrograph shape and lateral exchanges) were calculated for the 20 most important storm events of 108 stations in three French regions (Cévennes Mountains, Jura Mountains and Normandy), representative of different karst settings. These descriptors were compared and analysed according to catchment geology (karst, non-karst or mixed) and seasonality in order to explore the specific impact of karst areas on water balance, hydrograph shape, lateral exchanges and hydrogeological basin area. A statistical approach showed that, despite the variations with study areas, karst promotes (i) higher water infiltration from rivers during storm events, (ii) increased characteristic flood times and peak-flow attenuation, and (iii) lateral outflow. These influences are interpreted as mainly due to IGF loss that can be significant at the storm-event scale, representing around 50 % of discharge and 20 % of rainfall in the intermediate catchment. The spatial variability of such effects is also linked to contrasting lithology and karst occurrence. Our work thus provides a generic framework for assessing karst impact on the hydrological response of catchments to storm events; moreover, it can analyse flood-event characteristics in various hydro-climatic settings and can help with testing the influence of other physiographic parameters on runoff generation.

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“…Sensitivity analysis of the DWE to the two parameters is largely available in the literature, showing that the DWE is more sensitive to parameter C than D (Moussa and Bocquillon, 1996;Cholet al, 2017;Charlier et al, 2019). Here, C was assumed to be equal to CG and we used a fixed value for D = 10,000 m²/s (for medium size catchments of 100 to 500 km²; Moussa and Bocquillon, 1996;170 Todini, 1996) in a matter of parsimony, which is acceptable as the model is much more sensitive to C than to D. The DWE solution was validated experimentally under controlled conditions (Moussa and Majdalani, 2019), and has also been implemented on natural karst catchments (Charlier et al, 2015(Charlier et al, , 2019Cholet et al, 2017).…”

Section: Lateral-exchange Descriptorsmentioning

confidence: 99%

Impact of karst areas on runoff generation, lateral flow and interbasin groundwater flow at the storm-event timescale

Mesnil¹,

Moussa²,

Charlier³

et al. 2020

Preprint

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Abstract. Karst development influences the hydrological response of catchments. However, such impact is poorly documented and even less quantified, especially over short space and time scales. The aim of this article is thus to define karst influence on the different hydrological processes driving runoff generation, including interbasin groundwater flow (IGF) for elementary catchments at the storm-event time scale. Three types of storm-event descriptors (characterising water balance, hydrograph shape and lateral exchanges) were calculated for the 20 most important storm events of 108 stations in three French regions (Cévennes Mountains, Jura Mountains and Normandy), representative of different karst settings. These descriptors were compared and analysed according to catchment geology (karst, non-karst, or mixed) in order to explore the specific impact of karst areas on water balance, hydrograph shape and lateral exchanges. A statistical approach showed that, despite the variations with study areas, karst promotes: i) Higher water infiltration from rivers during storm events; ii) Increased characteristic flood times and peak-flow attenuation; and iii) Lateral outflow. These influences are interpreted as mainly due to IGF loss that can be significant at the storm-event scale, representing around 50 % of discharge and 20 % of rainfall in the intermediate catchment. The spatial variability of such effects is also linked to contrasting lithology and karstification degree. Our work thus provides a generic framework for assessing karst impact on the hydrological response of catchments to storm events; moreover, it can analyse flood-event characteristics in various hydro-climatic settings, and can help testing the influence of other physiographic parameters on runoff generation.

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Evaluating lateral flow in an experimental channel using the diffusive wave inverse problem

Cited by 9 publications

References 46 publications

Quantifying peakflow attenuation/amplification in a karst river using the diffusive wave model with lateral flow

Quantifying peakflow attenuation/amplification in a karst river using the diffusive wave model with lateral flow

Impact of karst areas on runoff generation, lateral flow and interbasin groundwater flow at the storm-event timescale

Impact of karst areas on runoff generation, lateral flow and interbasin groundwater flow at the storm-event timescale

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