这些河道最常见于近冲积扇体的顶端。

These channels are most common near the apex of the alluvial fan body.

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在前述研究基础上，探讨了下一步冲积扇的研究方向。

Finally, on the basis of the foregoing, the next research direction was discussed.

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冻结壁的安全性是深厚冲积层中冻结凿井的关键问题。

Study on the thickness of frozen wall in deep alluvium;

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冻结壁的安全性是深厚冲积层中冻结凿井的关键问题。

Study on the thickness of frozen wall in deep alluvium;

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