抄録
Crank flow is a flow pattern which has plain shape of crank, and after development, crank flow becomes to a bank attacking concentrated flow at sharp angle, and brings large scale bank erosion. Practically in many rivers in Japan, the developments of crank flows are recently becoming remarkable and are recognized beyond sufferance in some cases. In this paper, classification of crank flow and main causes of development are discussed using some field data and also field investigation in some rivers. Results of this study are expected to practical application and offer suggestion to further developments of the study.
