模型沙干重度的变化规律及其在泥沙模型试验中的作用

模型沙干重度在动床模型试验中是影响起动流速比尺和冲淤时间比尺的重要参数，其随淤积历时、粒径变化、埋置深浅和加工方法的不同有着不同的变化规律。通过试验，结合已有的成果，对模型沙干重度受以上几种因素的影响进行了研究，并进一步分析了其变化规律在动床模型试验中的作用。

Variability of Model Sediment Dry Unit Weight and Its Role in the Sediment Model Test

The model sediment dry unit weight is an important parameter to affect the competent velocity scale and the time scale of scour and silting in the mobile bed model test, and has different variabilities with silting duration, grain size, buried depth and processing method. In this paper, the influences of above factors on model sediment dry unit weight are studied, and the roles of its variabilities in the mobile bed model test are also analysed.