Placer tin deposit in xupu occurs in alluvial sediment of quatemary system and cassiterite chiefly concentrates at the bottom of gravel layers.

溆浦砂锡矿床赋存在第四系冲积层中锡石主要富集在底部砂砾石层。

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Sand wave movement is an important form of sediment movement for alluvial rivers and has a great effect on stream resistance.

沙波运动是冲积河流泥沙运动的一种重要形式。沙波的消长对河道水流的阻力损失有很大的影响。

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Alluvial channel resistance is one of the most important issues in sediment transport mechanics.

冲积河流阻力是泥沙运动力学中的一个重要问题。

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