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Summary
| Description |
Français : La porosité d'un substrat meuble (ex sable ou gravier) ou poreux (ex : roche calcaire) est déterminée par la taille des interstices entre les grains qui le constituent, et par la communication entre ces interstices. Toutes choses égales par ailleurs, un même fluide incompressible cheminera plus facilement et plus rapidement dans la situation 1 que dans la situation 2. Si l'on connait la porosité du substrat, et la pression du fluide (déterminée par la hauteur d'eau au dessus du niveau piézométrique d'équilibre, dans le cas d'une eau cherchant à s'infiltrer à partir de la surface), la Loi de Darcy permet de calculer la vitesse de percolation, et par suite un débit. Ceci est théorique : dans la réalité, les pores peuvent parfois se colmater (si le fluide est chargé), ou s'agrandir (si le fluide est solubilisant pour le matériau ; une eau acide dans un substrat calcaire par exemple). English: The porosity of a soft substrate (eg : sand or gravel) or porous rock (eg : limestone) is determined by the size of the interstices between the grains that constitute it, and the communication between the interstices. All things being equal, an incompressible fluid will track even more easily and quickly in situation 1 than in situation 2. If the porosity is known, and the fluid pressure (determined by the height of the water above the groundwater level equilibrium in the case of water trying to infiltrate from the surface), Darcy's Law to calculate the percolation rate, and hence flow. This is theoretical: in reality, the pores can sometimes become clogged (if the fluid is loaded), or expand (if the fluid is for solubilizing the material; acid water in a limestone substrate, for example) |
| Date | |
| Source | Own work |
| Author | Lamiot |
from Permeabilità1.png ; picture made by Fralama (cc-by-sa 3.0), put on commons 2009-09-27, thanks to him or her.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:21, 14 April 2023 | | 978 × 401 (53 KB) | Pedalito | remove black line on the left side (2 pixel width) |
| 16:31, 27 June 2014 |  | 980 × 401 (59 KB) | Lamiot | User created page with UploadWizard |
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