HYSTERESES AND TRANSIENT PHENOMENA IN A STEEP CIRCULAR CONDUIT WITH A SHARP EDGED INLET

Abstract

Construction of underground big rivers for peak cut of runoff forces researchers to investigate the problems of unsteady flow in a conduit at a heavy rain storm and improve the analytical methods for the flow. The important problem in this flow lies in transient phenomena between part-full and full flow, which have been reported by author to be strongly related with the shape of pipe inlet. But the effects and the transient properties are not incorporated sufficiently in the analytical methods. In this paper, the transient properties are investigated according to the hysteresis of the relation between head water level and discharge, and a hydraulic model is proposed to simulate the transient flow in the conduit.