Classification et clé de détermination des faciès d'écoulements en rivières de montagne

Abstract

Tfie hydromorpfiodynamic diversity of 294 units from 15 Pyrenean mountain streams was studied. 6 main groups and 18 secondary groups could be distinguished according to a multivariate analysis. A key for the détermination of morphodynamic units in mountain streams is proposed. Five successive quantitative or qualitative discrimination levels allow the détermination of 18 types of units. The variability of the biological characteristics of thèse 18 groups has been tested for trout and redd abundance. Thèse 18 groups explain 45.6 % of the total trout biomass variability, and 18.8 % of the young-of-the-year trout biomass variability.