Tassement et rhéologie des vases. Première partie

Bedding-down and rheology of muds

Docteur es Sciences, Conseiller scientifique Sogreah-LCHF, avec la participation du Service technique central de la Direction des Ports et Voies navigables et de la Mission de la recherche du Secrétariat d'Etat à la mer

Abstract

The knowledge of bedding-down conditions of very thin sediment deposits - of the muds, silts or alluvium type - and their consistency modifications day after day is a primordial element to tackle silting problems in a site and to search means which suits the best to find a solution. This article presented in two successive issues of the "Houille Blanche" provides a synthesis of various researches carried out during the twenty last years by le Laboratoire Central d'Hydraulique de France, relating to mud bedding-down and rheology. Thanks to results obtained on sediments of very different mineralogical, chemical and granulometrical types, associated to waters more or less rich in salts a certain number of empirical laws on the evolution of deposits density and rigidity can be expressed. Presumptions can be made on the angles of repose of banks and on their conditions of entrainment and transport by currents and swell taking the mechanical characteristics of these deposits into account.