ANNUAL AVERAGE CHANGE RATE OF RIVER CHANNEL CAPACITY OF CLASS-A RIVERS IN JAPAN

Abstract

The sediment balance in each segment of Class A rivers in Japan was studied as fundamental data for river management. The relationship between increase of river capacity and volume of river excavation for flood control and gravel mining was evaluated based on calculated sediment balance, and the trend of river capacity change was analyzed. As a result, the river excavation mainly cause the increase of river capacity and maintain the river channel volume which naturally decrease without river excavation.