ON THE FLOW AND BED CONFIGURATION AROUND THE GROIN AND FISH SWIMMING BEHAVIOR TO IT

Abstract

 The purposes of this study are to examine clearly the flow, bed configuration characteristics and the characteristic of fish swimming behavior around the groin. To complete them, the hydraulics experiments and to observed the movement of real fish were done.
 As the results, low velocity areas were formed the downstream of the groin and deviation flow was formed by the groin. Moreover, fish stayed at the high vorticity areas (more 2(rad/s)) and low velocity areas (25(cm/s) or less). On another front, fish run up at the small vorticity areas (2(rad/s) or less) and high velocity areas (25(cm/s). Therefore, fish behavior has the possibility that vorticity contributes coupled with velocity.