扇三角洲平原河道对湖平面下降响应的水槽实验

Experiment on the Influence of Lake Plane Decline on Fan Delta Plain River

分流河道的发育演化对扇三角洲整体的发育演化有重要影响,水体深度影响着分流河道的发育,因此研究水体深度变化对分流河道的影响并进一步探究扇三角洲整体的发育演化有很重要的意义。利用物理模拟的方法,通过水槽实验探究,表明湖平面下降促进分流河道的聚流,并使河道数目急剧下降,进而使扇三角洲向湖生长速度明显加快,而沿岸生长速度明显降低,同时垂向加积基本停止。

The development process of fan delta is the process that the sediment is filled witii space.The diversion channel plays an im portant role in this process,and the depth of w ater is an im the developm ent of diversion river.Therefore,It is of great significance to study the influence of the diversion channel and further explore the evolution of fan delta as a whole.Based on the physical physical sim ulation method,it is shown that the decline of the lake surface promotes the convergence of the diversion channel and makes the number of the river channel drop sharply,which makes the growth rate of the fan delta to be accerlerated obviously,while the coastal growtii rate is obviously reduced and the verical accumulation is nearly stopped.