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如同一般河流分为上、中、下游一样,山区溪流也可以按它的种种明显特征分区如下(参见图1).(一)汇水区(产沙区)汇水区是溪流上游在汇水的同时,由于侵蚀和发生崩坍等原因而产生大量沙石,并把沙石往下游输移的区域.(二)输沙区输沙区是上接产沙区的区域,这里溪谷多半狭小,岩盘剥露,很少发生侵蚀和崩坍,由于流速大,由产沙区输移下来的沙石不会在这里淤积.
As the general river is divided into upper, middle and lower reaches, mountain streams can also be divided according to its obvious characteristics (see Figure 1) (a) catchment area (sediment production area) catchment area is upstream of catchment catchment The area where large amounts of sand and gravel are generated due to erosion and collapses, and the gravel is transported downstream (II) The sediment transport area of the sediment transport area is the area where the sediment yield area is accessed, where the valleys are mostly narrow , There is little erosion and collapsing of the rock disk. Due to the large flow rate, the sand transported from the sand production area will not be deposited here.