Abstract: Four institutions were involved in the“Sediment movement”IMPACT work package. Laboratory experiments were carried out and a huge amount of data were gotten. Those experiments resulted in high-quality data sets for the validation of the numerical models. Meanwhile, the Lake Ha! Ha! case study helped identifying and understanding the key features of the geomorphological changes induced by a dam-break flood. Besides, an assessment of the capabilities and the uncertainty of current numerical models was achieved through comparison between the modeling data and the observations in laboratory experiments and the specific case. At last, some conclusions and recommendations were presented, for reference.

摘要： 4家研究机构参与了IMPACT项目泥沙运动专题的研究。研究中首先进行了一系列的试验室试验，获取了大量的试验数据。研究机构建模模拟了试验室极端洪水条件下的泥沙运动，并结合Lake Ha！Ha！大坝溃决事件，研究人员将模型用于该真实案例的模拟研究中。通过对比试验室试验数据和真实溃坝案例的数据，检验了数字模型，评价了各模型的性态和不确定性，并依此提出了关于未来研究的建议。