EROSION CHARACTERISTICS AT EXPOSED RIVER CHANNELS ON MUDSTONE/ALLUVIAL COHESIVE SOIL LAYER IN LOWER REACHES OF KINUGAWA RIVER

Abstract

Recently unprecedentedly rapid riverbed degradations are observed at several parts river channels on mudstone/alluvial cohesive soil layer in lower reaches of Kinugawa River, which has brought various problems upon river management.

To elucidate riverbed degradations mechanism at exposed river channels on mudstone/alluvial cohesive soil layers, this report focuses on the relationship between geological time of river sediment/geological structure and erosion, and implements factorial analysis regarding riverbed erosion types and characteristics based on the geological survey and measurement.