黄河下游断面形态与水沙输移关系及数学模拟方法

THE INTER-EFFECTS BETWEEN RIVER GEOMETRY AND FLOW AND SEDIMENT TRANSPORT AND ITS SIMULATING APPROACH

以前人对黄河下游的实测资料分析为基础,本文讨论断面形态与来水来沙关系、断面形态对输水输沙的影响,并根据实测资料,提出黄河下游弯段与直段断面冲淤变化的两种模式,建立了主流摆动及坍岸影响断面形态变化以及纵向冲淤量在断面的分布两种数学模拟方法。

Based on the researches of the field data of the Lower Yellow River,the inter-effects between channel geometry and flow and sediment transport have been analysed and two patterns of scour-fill changes in river bends and straight reaches have been suggested. The effects of channel geometry on flow and sediment transport could be estimated through the following eqationsin which β and α are usually not equal to unity, The narrower the cross-section is, the higher the values of β and α.The role of flow and sediment transport on cross section could be considered by eqs. (27) to (30)