【摘要】 对于河槽极不均匀、河床冲淤变化很大的河段,用运动波法和一般扩散波法作洪水流量演进及泥沙演进,效果都不好.本文按能量守恒原理导出了河道非恒定流的能量方程,并由此推出考虑了水面比降变化及水位涨率变化的扩散方程.用这一扩散方程对黄河下游作水、沙实时预报,效果很好.更多还原

【Abstract】 In a river reach with nonuniform channel and highly unstable bed, to use the kinematic wave analogy or classical diffussive wave analogy for floodrouting and forecasting is not effective.In this paper, based on the principle of conservation, and energy equation for unsteady flow in rivers was derived, and a diffussive equation allowed for the time variance of water surface slope and rate of change of stage was deduced.Using this new model,the flow and sediment real-time forecasting in the lower reaches of Yellow River is valid.更多还原