河岸侵食対策のための目標澪筋による水制群設計法

抄録

This report proposes a design method of groynes for riverbank protection. As a time-honored precedent, Niyodo Groynes in Kochi, Japan implies a natural process of focusing and dispersing flow, developing pool-riffle-bar and shifting thalweg during a flood event. Traditional river engineering indicates essences of groyne techniques to fix thalweg on riverbed, create calm water zones at riverbank and maintain the channel at the minimum cost. These previous knowledges suggest a new design concept of “target thalweg method” which was used to determine parameters of a series of groynes at La River in Ha Tinh, Vietnam. This is an interactive approach to make intentional impact to and wait expected reaction from the river, so that it is applicable to sustainable river management for erosion control, water intake security and natural habitat conservation.