Mechanics of Open-Channel Flow Systems

摘要

Accurate and efficient computational procedures were sought for predicting steady and unsteady flows in open-channel systems. A major element of such systems is a long reach of channel containing a flow that may be variable along its length. Prediction of the resulting time-dependent surface profiles was achieved by the use of a number of finite-difference schemes based upon explicit, implicit, and characteristics approaches. The problem of steep fronted waves--bores--arising as the result of sudden, large changes in channel discharge, was studied and a computational technique developed. Flow profiles and discharges coefficients for a series of hydraulic structures--overfalls, gates, and sills were obtained by analytical means. A mathematical model of a complete open channel flow system was developed. (Author)