river bed evolution 河床演变
river-bed evolution 河床变迁
bed evolution law 河床演变规律
bed evolution analysis 河床演变分析
sea bed evolution process 海床演变
analysis on river bed evolution 河床演变分析
Evolution river-bed 河床变动
It is an important content to calculate water level for ice hydraulics and ice hydrology and it has important effected on preventing and forecasting ice flood and bed evolution.
冰期水位计算是冰水力学、冰水文学的重要内容，对于防治、预报凌汛乃至研究冰期河床演变均具有重要的作用。
The paper studies the change of tideland after the century inning by method of "artificial transformation" forecast and moveable bed model based on the analysis of the bed evolution data.
文章在河床演变资料分析的基础上，采取“人工变形”预测与大范围动床模型试验预测等手段研究了世纪丘围涂工程实施后堤外高滩的变化。
That may be a hint that the action evolved as a social cue - "time for us all to go to bed" - although as usual when evolution and human behaviour meet, the tie is speculative at best.
也许这是打哈欠进化为社交线索的一种暗示——“到我们大家睡觉的时间了”——不过，像往常一样，当进化和人类行为相遇时，推测充其量只是纽带。
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