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回流沱,亦简称沱,系山区河流的河道,在水流作用下,抗冲性强的河岸变化甚微,但抗冲性弱的河岸则被水流旁蚀拓宽,形成回流沱。以往,沱内建港似乎被人们所承认,并列入《河港总体及工艺设计》规范的有关条文。实际上,从水流条件及泥沙冲淤稳定条件看,在回流沱内建港是有条件的。因为沱内存在回流,它给船舶靠离码头带来不便;加之沱内冲淤变化的复杂性及在一定年份内的不平衡性,使得沱内不能在任何年份的枯水季
Reflux Tuo, also referred to as the Tuo, Department of mountain river rivers, under the effect of water flow, the impact of strong river banks changed little, but the weaker river banks were widened by the water next to the formation of backwash Tuo. In the past, Tuojianjiangang seems to be recognized by people, and included in the “river port overall and process design” norms of the relevant provisions. In fact, from the current conditions and silt erosion and deposition stability conditions, the return of Tuo built a conditional. Because of the back flow in TuoTai, it brings inconvenience to the ship by leaning from the jetty. In addition, the complexity of TuoZhong scouring and silting changes and imbalance in a certain year make TuoNi unable to dry in the dry season of any year