Choose the type of sand for substantiality model is a key technology.It directly influences the reliability of the result of experiment and similarity of the sand motion and riverbed distortion.

• 模型沙的选择是泥沙实体模型设计中的一项关键技术，直接关系到模型的泥沙运动和河床变形相似性及模型试验成果的可靠性。