Effects of Groin Placement for the Present Water Way of Tone River − Evaluation on both aspects of flood Protection and Natural environment −

Abstract

Tone River is one of the major rivers in our country. The groin has been put to use from the Meiji period to keep the Water Way for the cargo shipment,and to protect the area from the flood danger.

In recent years, the groin becomes being paid attention not only for the flood control function, but also for the viewpoint of enhancement of natural environment such as the increase of habitats for various beings. This is because the groin has largely related to the formation of the present river way.

In this paper,we carried out the functional evaluation of the groin for both aspects of flood control and natural environment,based on the field investigation. We hope this will encourage the further advancement of river improvement works in Tone River.