Assessing the retention capacity of a floodplain using a 2D numerical model

Valentová, Jana; Valenta, Petr; Weyskrabová, Lenka

doi:10.2478/v10098-010-0021-1

Cited by 13 publications

(7 citation statements)

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“…The ceiling of outflow intensity with the increase of discharge into the river is most probably explained by the occurrence of overbank flow, knowing that flood plain attenuation can play a key role on the modification of hydrograph shape (Fleischmann et al, ; Rak et al, ; Sholtes & Doyle, ; Valentova, Valenta, & Weyskrabova, ). Indeed in the study case, outflow on the flood plain appears to be an important process of peakflow attenuation for the highest floods, because the increase in infiltration with an increased input peakflow is stopped (Figure ).…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…In these restoration measures, riparian vegetation can be planted to increase roughness. These increases in the roughness may increase the local water levels, but their downstream effects tend to be very small, as the main control on flood peak attenuation is the volume of water stored on the floodplain at the time of the peak, relative to the flood wave volume (Valentová et al, 2010).…”

Section: (Ii) Floodplain Removalmentioning

confidence: 99%

“…by deforestation) may invoke a complex causal chain of process changes and bistable dynamic behaviour (Runyan et al, 2012) affecting flooding via interception, evapotranspiration and infiltration changes. Feedbacks between soil moisture and precipitation occur from local to global scales and may have very significant effects on the magnitude of precipitation (Hohenegger et al, 2009;Van der Ent and Savenije, 2011).…”

Section: Feedbacksmentioning

confidence: 99%

Understanding flood regime changes in Europe: a state-of-the-art assessment

Hall

Arheimer

Borga

et al. 2014

Hydrol. Earth Syst. Sci.

486

335

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Abstract. There is growing concern that flooding is becoming more frequent and severe in Europe. A better understanding of flood regime changes and their drivers is therefore needed. The paper reviews the current knowledge on flood regime changes in European rivers that has traditionally been obtained through two alternative research approaches. The first approach is the data-based detection of changes in observed flood events. Current methods are reviewed together with their challenges and opportunities. For example, observation biases, the merging of different data sources and accounting for nonlinear drivers and responses. The second approach consists of modelled scenarios of future floods. Challenges and opportunities associated with flood change scenarios are discussed such as fully accounting for uncertainties in the modelling cascade and feedbacks. To make progress in flood change research, we suggest that a synthesis of these two approaches is needed. This can be achieved by focusing on long duration records and flood-rich and flood-poor periods rather than on short duration flood trends only, by formally attributing causes of observed flood changes, by validating scenarios against observed flood regime dynamics, and by developing low-dimensional models of flood changes and feedbacks. The paper finishes with a call for a joint European flood change research network.

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“…As both inundation and retention contribute to ecosystem function, biodiversity and habitat suitability, understanding the variability of their spatial patterns and links to flows, which drive the ecology of associated floodplain wetlands, will be crucial but depends on identifying robust and rigorous techniques for such an analysis (Thomas et al, 2011). Many studies have explored either the modelling of inundation extent or the methods of retention estimate (Horritt and Bates, 2002;Romanowicz and Beven, 2003;Tayefi et al, 2007;Noe and Hupp, 2007;Valentova et al, 2010). In reality, any successful method needs to account for the relationships between flow and ecological response, either implicitly or explicitly.…”

Section: Introductionmentioning

confidence: 99%

Estimate of flood inundation and retention on wetlands using remote sensing and GIS

et al. 2014

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Flood inundation and retention are key hydrological characteristics of floodplain wetlands. This study developed a methodology for regional estimates of potential floodwater retention under floodplain inundation from ecologically significant flood return periods by coupling remote sensing and geographic information system technologies with spatial hydrological modelling. The Macquarie Marshes in Australia were selected as the case study area. Time series of Moderate Resolution Imaging Spectroradiometer 8-day composite imagery were related to peak flows (Ml day À1 ) of the 1-in-10 return period. Inundation extent in corresponding images was detected using the modified normalised difference water index (mNDWI). The potential maximum soil water retention was derived using a spatial hydrological modelling approach, which is driven by the Soil Conservation Service Curve Number (SCS CN) method. Soil and land cover data were collected and intersected to determine spatial distribution of CN using ArcGIS. The CN-based retention capacity map was then integrated with an inundation extent map to delineate the spatial pattern of retention under inundation. The results have ecological implications in relation to the response of broad eco-types in wetlands. This study has proved that the integration of remote sensing, geographic information system and spatial hydrologic modelling can be used to provide essential information as inputs to the management of environmental flows in terms of sustaining ecosystem function, biodiversity and habitat suitability.

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Assessing the retention capacity of a floodplain using a 2D numerical model

Cited by 13 publications

References 1 publication

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

Understanding flood regime changes in Europe: a state-of-the-art assessment

Estimate of flood inundation and retention on wetlands using remote sensing and GIS

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