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候旗沟流域地处青藏高原东北缘,降雨量集中且充沛,流域内支沟发育,沟谷深切,山坡陡峻,相对高差大,沟内固体物源储量丰富,沟床纵比降大,具备泥石流发育的条件。文章在深入分析4条泥石流沟形成的地质环境条件基础上,系统研究了泥石流静动力学特征、灾害史及爆发频率;采用层次分析法(AHP),选择单位面积物源储量、主沟纵比降、人口密度等10项因子,建立了泥石流易发性评价体系,通过对评价因子的定性分析和计算得到每条泥石流沟易发性大小,评价结果与历史调查结果有着很好的一致性。评价方法及评价结果对类似地区泥石流灾害的防治具有一定的参考价值。
Waigao Gully basin is located in the northeastern margin of the Qinghai-Tibet Plateau, rainfall is concentrated and abundant, the development of tributaries in the basin, deep gorges, steep slopes, relative elevation difference, the rich source of solid reserves in the trench, gutter vertical ratio, with Debris flow development conditions. Based on the in-depth analysis of the geological and environmental conditions for the formation of four debris flow ditches, the article systematically studied the characteristics of debris flow hydrodynamics, disaster history and frequency of outbursts. Using Analytical Hierarchy Process (AHP), the provenance reserves, This paper established a debris flow susceptibility assessment system by qualitative analysis and calculation of evaluation factors. The evaluation results were in good agreement with the historical survey results. Evaluation methods and evaluation results have certain reference value for the prevention and control of debris flow hazards in similar areas.