A STUDY ON THE PERIODICITY OF THE CHARACTERISTIC FLOW STRUCTURES AT THE SITES OF WATER ACCIDENTS

Abstract

In this study, the characteristic flow structures that often observed in water accident sites were investigated. The flow structures were numerically examined by using precise under water geometries of water channels which were obtained by relatively new methods. The results show that the several features were observed in water accident sites, such as downward flows from a rapidsection to a pool, a high velocity shear flow and recirculating currents near downstream of a channel restriction. The results of frequency analysis also showed that those structures were characterized by channel geometries and mean flows.