由盐水和淡水相互作用所产生的异重流，在河口泥沙输移中也是很重要的。
Density currents generated by saline and fresh water interactions are also important in the transport of sediment in estuaries.
水沙两相流冲淤的双临界现象，对于多沙河流河道泥沙的输移有重要意义。
This double threshold phenomenon plays an important role in sediment transportation of heavily sediment laden rivers.
沿岸流不稳定运动目前已成为一个研究热点，对于沿岸流不稳定的研究对于近岸泥沙、污染物输移以及海岸养护等都有很重要的意义。
Recently, the research on the instability of longshore currents becomes the hotspot. The study on this problem has great effects on the sediment and contamination transport and coastal defences.
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