Hydrologie Souterraine

Objectives

The objective of this course is to present a quantitative approach to groundwater circulation(water in the soil, groundwater and confined water tables), e.g. to study problems related to the exploitation of the land
groundwater resources (protection and interaction of pumping wells, agricultural drainage,etc). We are also interested in surface/subsurface couplings (evaporation-infiltration-runoff,interactions, flood plains), and coastal processes (saltwater intrusion, effects of tides on coastal aquifers).

Description

From the notion of porous media and Darcy's law, we develop:
- 3D equations of saturated groundwater flows (confined or not);
- the equations of planar groundwater flows (confined or not): vertical approximation hydrostatic in the water table, unsaturated flows being neglected above the free surface(if it exists);
- flow equations in unsaturated soils (air/water), unsaturated hydrodynamic properties (air/water), unsaturated hydrodynamic properties (air/water), and unsaturated soil flow equations (air/water).
of unsaturated media (and their measurements in the lab or in situ), and the infiltration theory vertical. From these bases, we develop equations and specific analyses adapted to situations treated, e.g.: taking into account density effects (salt intrusion); conditions kinematics and dynamics at the hydrological interfaces (free surface of the water table, water interface, etc.).fresh / salt water); draining through semi-permeable layers; isolated pumping wells or well group; evaporation-infiltration in multilayer soil (interface conditions); and materials);

One or two case studies are then considered, treated analytically and numerically. These case studies include (depending on the year):

- Saltwater intrusion in coastal aquifers: calculation of the salt wedge and sensitivity analysis;
- infiltration/runoff, puddle formation, perched aquifers, multi-layered soils;
- pumping wells: pumping tests to identify the properties of an aquifer;
- oscillation phenomena in a coastal aquifer (tidal and wave effects).