沙垄 meaning in Chinese

longitudinal dune

At some higher velocity the ripples or dunes disappear and the bed becomes flat .
流速增大时，沙纹、沙垄消失，河床变平。
In the upper reach the bed was dune covered and in the lower reach it was flat .
上游河段的床面为沙垄所覆盖，而下游河段则为平整床面。
The presence of dunes or antidunes in streams alternately decreases and increases the local depth .
河流中沙垄和逆行沙垄的存在，使局部水深交替地增大或减小。
For some sediments and flow the flat bed does not occur and the bed form goes directly from dunes to antidunes .
对某些泥沙和水流，平整床面并不发生，而床面形状则直接从沙垄转为逆行沙垄。
His feet marched in sudden proud rhythm over the sand furrows , along by the boulders of the south wall
他忽然用脚得意地打起拍子，跨过沙垄，沿着那卵石垒成的南边的防波堤走去。