Debris flow gully has various morphologies because of different type and developed phase of debris flow, and it is important and practical to study the debris flow gully.

泥石流沟谷因泥石流类型和发育阶段不同而具有多种形态，对其进行研究具有十分重要的理论和实际意义。

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All those are conducive to correct identification of debris-flow gully and analysis of debris-flow hazards and also are important for debris-flow forecast and prevention.

有助于人们准确判别泥石流沟，认识泥石流灾害，从而做好预测和防治工作。

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The "Grey Class Model" is constructed, and then the danger degree has been assessed on Guxiang gully debris flow.

建立“灰色类别模型”，对古乡沟泥石流进行危险性评价。

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