河床

• 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。
• Channels generally contain coarser sediment than do the adjacent flood plains .
  河床沉积物一般比邻近的泛滥平原沉积物粗些。
• As the sampler is dragged along the bed, it collects a sample from the top layer of bed material .
  取样器沿河底拖动，收取表层河床质。
• The quantity of material that goes into suspension depends on the fluid forces at the bed .
  进入悬浮的泥沙数量取决于河床上的流体的作用力。
• At some higher velocity individual grains will roll and slide intermittently along the bed .
  在稍高一些的流速时，个别的颗粒沿着河床间歇地滚动和滑动。
• When the ganges comes down， it might be expected to wash the excrescence back into the soil .
  流经这里的恒河似乎随时可能把这块多余的地方冲回到河床底下去。
• An ancient bus stopped by a dry river bed and a party of famous actors and actresses got off .
  一辆古旧的大客车在一条干涸的河床边停下，一群著名男女演员下了车。
• Bed load particles move spasmodically, perhaps at long intervals, and are at rest on the stream bed most of the time .
  推移质颗粒多半作间歇运动，而大部分时间则停歇在河床上。
• Efficient and economical artificial recharge projects can often result from utilizing the bed of the main stream channel .
  有效而且经济的人工补给措施一般可以利用主河道的河床。
• Where resistant channel materials prevail, erosion is limited solely to "plunge pools" immediately below the outlets .
  如果河床为抗冲物质，则冲刷仅限于紧靠出口下游的“冲刷坑”。