Underground flows - 4EMHABE0

Goal(s)

Understand, size and model the problems and solutions linked with the presence of water in the soil.
In Hydrogeology, it can be about exploiting the underground water resource by samplings that need to be adequately adjust to minimize the impacts in terms of water aquifer drawdowns.
Moreover, the problems encountered in civil Engineering (internal erosion in earth dams, underpressure limitations,...) need some techniques to be developed to control the underground flows.

Content(s)

The water presence in the soil represents a factor of interest or annoyance according to the engineer concerns. We remind that the disorders related to the water flow through the dikes can cause ruptures and provoke serious consequence floodings.
After having introduced the laws and equations that rule the porous medium flows, some current problems in underground hydraulics are aimed to be solved by analytival, graphical and numerical methods. Thus, the spatio-temporal distribution of the hydraulic load in a soil, the evaluation of the pumping and drainage influence, and the leakage rate calculation through a geotechnic work are approached. In particular, the following notions are stressed:
• Darcy's law ;
• Equivalent permeabilities ;
• Regressive erosion phenomenon (deep seepage) ;
• Principal equations and simple solutions ;
• Well hydraulics ;
• Graphical method and flow complex potential ;
• Introduction of the numerical modeling.

Fluid mechanics and hydraulics