今天所作的报告没有什么高深的理论,只是我们在水土保持查勘中应有的常识。一、流域性的认识一般河流,包括三种不同的性质。一是上游性,其表现是:山高、坡陡、流急,有窄狭的峡;二是中游性,其表现是:两岸高山离的比较远,山下有邱陵,邱下有源,河道宽,有弯曲的形状:三是下游性,其表现是河道平缓;河床成槽状,多分 There is no profound theory in today’s report, only the common sense we should have in the soil and water conservation survey. First, the understanding of the general river basin, including three different nature. First, the upstream, its performance is: high mountain, steep slope, rapid, narrow narrow gorge; second is the midstream, its performance is: far away from the mountains across the Taiwan Strait, there are Qiu Lingxia, Qiu under the active, river Wide, curved shape: Third, the downstream sex, its performance is gentle; river into a groove, multi-point