Analysis and Simulation of Low Flow Hydraulics

Abstract

A one‐dimensional mathematical model has been developed to simulate accurately channel characteristics under low flow conditions in alluvial channels. For a given steady discharge, channel geometry, and channel bed particle size distribution, the model predicts the flow depth, the mean velocity, and the flow resistance. Energy losses are assumed to result from flow resistance, as well as from local losses generated by the contractions and expansions occurring through the pool‐riffle sequence. Laboratory and field data were used to calibrate and verify the model, as well as to conduct an in‐depth analysis of the flow characteristics associated with low discharges.