Even the chemical synthesis model sand can not satisfy the need of silt dynamics research in different similar scale for the expensive self-cost and unchangeable density.

• 而采用合成的树脂颗粒作为模型沙，成本较高，且过于圆滑，亦不能根据相似比尺的要求调整其密度，给泥沙动力学研究造成不便。