This study aims at better understanding the variability of the Red River plume in the Gulf of Tonkin (GOT) in the mid and far field area using a numerical modeling approach. Understanding the plume variability and the fate of the delta waters is of primary importance for an in-depth knowledge and a better prediction capacity of the ocean circulatio...
The objectives of this study are to characterize the input signal of a shallow carbonate aquifer in northeastern France and to clarify the recharge and groundwater mineralization processes, by analysing the chemical and isotopic (δ18O, δ2H) composition of rain and groundwater. The groundwater isotopic signature was very close to the calculated loca...
This manuscript presents hydraulic-hydrological modeling approaches for hydrographic networks that can exploit the multi-sourced data using variational assimilation. It aims at a synergy between the complex numerical modeling of physical quantities and the heterogeneous observability of hydrodynamic signatures. One of the difficulties of the assimi...
Cette étude a pour but d’examiner les tendances présentes dans les étiages du bassin Adour-Garonne sur un ensemble de stations hydrométriques aux débits peu influencés par les actions humaines, positionnées principalement en tête de bassin et couvrant presque 10%du territoire, pour déceler des éventuels impacts du changement climatique sur l’hydrol...
This work investigates numerical method and equivalent continuum approach (ECA) of fluid flow in fractured porous media. The commonly used discrete fracture model (DFM) without upscaling needs full discretization of all fractures. It enjoys the merit of capturing each fracture accurately but will get in trouble with mesh partition and low computati...
Urban areas are at stake under the threat of climate change. To overcome this challenge it is necessary to deepen our understanding of heavier and particularly local rainfall to avoid flooding and build resilient cites that can become sustainable. The main difficulty is that geophysics and urban dynamics are strongly nonlinear with associated extre...
Large boulders can jam in constrictions, both in canyons and man-made structures (e.g., slit-dams). Boulder jamming occurs stochastically, and partially governs the outflow rate of debris flow material. Explicit hydro-mechanical models of boulder-laden flows are too computationally demanding to study this stochasticity. This study presents a new fr...
The exact solution for the concentration breakthrough curves resulting from a solute injection in radially converging flow in an aquifer obtained using Laplace transforms has a complex form difficult to compute, and cannot be given in closed-form expression. This makes it difficult to use for tracer tests analysis in radial flow. To overcome this d...
Le présent document propose différents outils et méthodes d’approche pour caractériser les échanges entre rivières et écoulements karstiques dans la traversée des plateaux calcaires. Ce document est destiné aux acteurs de l’eau qui souhaitent étudier ces échanges. Les méthodes présentées ont été testées, développées et appliquées au cours d’un proj...
Tropical floodplains are regions which are temporarily or permanently flooded due to the overflow of rivers over a lowland area. Floodplains over large rivers may have a predictable annual flood regime which is why they are important ecological places with a rich biodiversity providing important ecological services. The Pantanal which is one of the...
