Un outil de modélisation intégrée du transfert des nitrates sur un système hydrologique : application au bassin de la Seine

Gomez, Eric; Ledoux, Emmanuel; Viennot, Pascal; Mignolet, Catherine; Benoît, Marc; Bornerand, Cendrine; Schott, Céline; Mary, Bruno; Billen, Gilles; Ducharne, Agnès; Brunstein, Daniel

doi:10.1051/lhb/2003045

Cited by 41 publications

(49 citation statements)

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“…Only few exchanges and low discharges occur in the core of the meander, while the neck is characterised by intense water exchanges between the river and the sediments (Revelli et al, 2008). The effect of successive meanders on water pathways and travel times was also simulated in an homogeneous alluvial aquifer (Cardenas, 2009a), which can help restoration projects involving channel modifications (Gomez et al, 2012). The sinuosity of the stream depends on its functioning and the characteristics of its alluvial plain.…”

Section: Morphological Shaping Related To the Hydro-sedimentary Rivermentioning

confidence: 99%

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Flipo

Mouhri

Labarthe

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. Coupled hydrological-hydrogeological models, emphasising the importance of the stream-aquifer interface, are more and more used in hydrological sciences for pluridisciplinary studies aiming at investigating environmental issues. Based on an extensive literature review, stream-aquifer interfaces are described at five different scales: local [10 cm- . This led us to develop the concept of nested stream-aquifer interfaces, which extends the well-known vision of nested groundwater pathways towards the surface, where the mixing of low frequency processes and high frequency processes coupled with the complexity of geomorphological features and heterogeneities creates hydrological spiralling. This conceptual framework allows the identification of a hierarchical order of the multi-scale control factors of stream-aquifer hydrological exchanges, from the larger scale to the finer scale. The hyporheic corridor, which couples the river to its 3-D hyporheic zone, is then identified as the key component for scaling hydrological processes occurring at the interface. The identification of the hyporheic corridor as the support of the hydrological processes scaling is an important step for the development of regional studies, which is one of the main concerns for water practitioners and resources managers.In a second part, the modelling of the stream-aquifer interface at various scales is investigated with the help of the conductance model. Although the usage of the temperature as a tracer of the flow is a robust method for the assessment of stream-aquifer exchanges at the local scale, there is a crucial need to develop innovative methodologies for assessing stream-aquifer exchanges at the regional scale. After formulating the conductance model at the regional and intermediate scales, we address this challenging issue with the development of an iterative modelling methodology, which ensures the consistency of stream-aquifer exchanges between the intermediate and regional scales.Finally, practical recommendations are provided for the study of the interface using the innovative methodology MIM (Measurements-Interpolation-Modelling), which is graphically developed, scaling in space the three pools of methods needed to fully understand stream-aquifer interfaces at various scales. In the MIM space, stream-aquifer interfaces that can be studied by a given approach are localised. The efficiency of the method is demonstrated with two examples. The first one proposes an upscaling framework, structured around river reaches of ∼ 10-100 m, from the local to the watershed scale. The second example highlights the usefulness of space borne data to improve the assessment of streamaquifer exchanges at the regional and continental scales. We conclude that further developments in modelling and field measurements have to be undertaken at the regional scale to enable a proper modelling of stream-aquifer exchanges from the local to the continental scale.

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Section: Morphological Shaping Related To the Hydro-sedimentary Rivermentioning

confidence: 99%

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Flipo

Mouhri

Labarthe

et al. 2014

Hydrol. Earth Syst. Sci.

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“…In this study, the forcerestore version of ISBA is used, with three soil layers (Boone et al, 1998). MODCOU (Ledoux et al, 1984;Gomez, 2002) is the last component of the modelling system. It uses the information provided by ISBA to simulate river flow and the evolution of the aquifers.…”

Section: Hydro-meteorological Systemmentioning

confidence: 99%

Statistical and dynamical downscaling of the Seine basin climate for hydro‐meteorological studies

Boé

Terray

Habets

et al. 2007

Intl Journal of Climatology

490

333

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Abstract:Two downscaling methods designed for the study of the hydrological impact of climate change on the Seine basin in France are tested for present climate. First, a multivariate statistical downscaling (SD) methodology based on weather typing and conditional resampling is described. Then, a bias correction technique for dynamical downscaling based on quantile-quantile mapping is introduced. To evaluate the end-to-end SD methodology, the atmospheric forcing derived from the large-scale circulation (LSC) of the ERA40 reanalysis by SD is used to force a hydrological model. Simulated discharges reproduce historical values reasonably well. Next, the dynamical and statistical approaches are compared using the Météo-France ARPEGE general circulation model in a variable resolution configuration (resolution around 60 km over France). The ARPEGE simulation is downscaled using the two methodologies, and hydrological simulations are performed. Regarding downscaled temperature and precipitation, the statistical approach is more efficient in reproducing the temporal and spatial autocorrelation properties. The simulated river discharges from the two approaches are nevertheless very similar: the two methods reproduce well the seasonal cycle and the daily distribution of streamflows. Finally, the results of the study are discussed from a practical impact study perspective.

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“…The rainfall-runoff model calculates the amount of water entering the river network via surface and hypodermic flows on river grid cells. This approach is similar to the ISBA-MODCOU method (Gomez, 2009;Habets et al, 2010). Then, a very simple 1-D routing model, based on kinematic wave equations with constant velocity, is applied.…”

Section: General Description Of the Modelmentioning

confidence: 99%

Analysis of the French insurance market exposure to floods: a stochastic model combining river overflow and surface runoff

Moncoulon

Labat

Ardon³

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract. The analysis of flood exposure at a national scale for the French insurance market must combine the generation of a probabilistic event set of all possible (but which have not yet occurred) flood situations with hazard and damage modeling. In this study, hazard and damage models are calibrated on a 1995-2010 historical event set, both for hazard results (river flow, flooded areas) and loss estimations. Thus, uncertainties in the deterministic estimation of a single event loss are known before simulating a probabilistic event set. To take into account at least 90 % of the insured flood losses, the probabilistic event set must combine the river overflow (small and large catchments) with the surface runoff, due to heavy rainfall, on the slopes of the watershed. Indeed, internal studies of the CCR (Caisse Centrale de Reassurance) claim database have shown that approximately 45 % of the insured flood losses are located inside the floodplains and 45 % outside. Another 10 % is due to sea surge floods and groundwater rise. In this approach, two independent probabilistic methods are combined to create a single flood loss distribution: a generation of fictive river flows based on the historical records of the river gauge network and a generation of fictive rain fields on small catchments, calibrated on the 1958-2010 Météo-France rain database SAFRAN. All the events in the probabilistic event sets are simulated with the deterministic model. This hazard and damage distribution is used to simulate the flood losses at the national scale for an insurance company (Macif) and to generate flood areas associated with hazard return periods. The flood maps concern river overflow and surface water runoff. Validation of these maps is conducted by comparison with the address located claim data on a small catchment (downstream Argens).

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Un outil de modélisation intégrée du transfert des nitrates sur un système hydrologique : application au bassin de la Seine

Cited by 41 publications

References 0 publications

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Statistical and dynamical downscaling of the Seine basin climate for hydro‐meteorological studies

Analysis of the French insurance market exposure to floods: a stochastic model combining river overflow and surface runoff

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