赵鑫, 张海太, 赵志芳, 等.2020.滇西北海巴洛沟"7·28"降雨-冰川融水混合型泥石流成因研究[J].工程地质学报, 28(6):1372-1382.doi: 10.13544/j.cnki.jeg.2020-505.
    引用本文: 赵鑫, 张海太, 赵志芳, 等.2020.滇西北海巴洛沟"7·28"降雨-冰川融水混合型泥石流成因研究[J].工程地质学报, 28(6):1372-1382.doi: 10.13544/j.cnki.jeg.2020-505.
    Zhao Xin,Zhang Haitai,Zhao Zhifang,et al.2020.Study on the genesis of rainfall-glacier mixed type debris flow of Haibalo gully in northwest Yunnan on July 28,2019[J].Journal of Engineering Geology,28(6):1372-1382.doi: 10.13544/j.cnki.jeg.2020-505.
    Citation: Zhao Xin,Zhang Haitai,Zhao Zhifang,et al.2020.Study on the genesis of rainfall-glacier mixed type debris flow of Haibalo gully in northwest Yunnan on July 28,2019[J].Journal of Engineering Geology,28(6):1372-1382.doi: 10.13544/j.cnki.jeg.2020-505.

    滇西北海巴洛沟“7·28”降雨-冰川融水混合型泥石流成因研究

    STUDY ON THE GENESIS OF RAINFALL-GLACIER MIXED TYPE DEBRIS FLOW OF HAIBALO GULLY IN NORTHWEST YUNNAN ON JULY 28, 2019

    • 摘要: 海巴洛沟位于滇西北横断山区,2019年7月28日凌晨2:40暴发泥石流灾害,为科学准确开展该区域泥石流监测预警和综合防治工作,保障海巴洛沟流域中下游香丽(香格里拉至丽江)高速公路建设和运营安全,本文根据实地、无人机航拍及遥感调查,结合室内试验和分析计算,对本次泥石流特征及成因进行研究。本次泥石流平均容重为16.77 kN·m-3,属稀性泥石流,洪峰流量为528.16 m3·s-1,属特大泥石流。受地质、气候条件综合作用,海巴洛沟流域内物源包含3类:河谷区沟道侧岸滑坡体、高位冰碛物和高位寒冻风化碎屑。本次泥石流发生在27日晚至28日凌晨主体降雨过程的尾部,根据对2019年8~10月海巴洛沟流域9次降雨过程的监测,发现该区域降雨具有主体过程为6 h、降雨量随海拔升高而显著增加的时空分布特征。激发本次泥石流的强降雨集中分布在哈巴雪山西侧海拔4200~4800 m的峰脊区,6 h降雨过程平均降雨量为60.43 mm。激发水源除降雨外,还包含峰脊区内冰川融水,经计算本次6 h降雨过程中冰川平均消融水当量为17.29 mm。本文研究成果可为滇西北横断山区降雨-冰川融水混合型泥石流监测预警及防治提供可靠科学依据。

       

      Abstract: The Haibalo Gully located in the Hengduan Mountain region in northwest Yunnan, where a debris flow broke out at 2:40 am on July 28, 2019. In order to scientifically and accurately carry out debris flow monitoring, early warning and comprehensive prevention work in this area and guarantee the construction and operation safety of Xiangli(Shangri-La to Lijiang) highway in the middle and lower reaches of Haibalo Valley, this paper studied the characteristics and genesis of this debris flow according to the field survey, UAV aerial photography and remote sensing, combined with indoor experimental analysis and calculation. For this debris, the maximum bulk density was 16.77 kN·m-3, so it belonged to low-viscosity debris flow, with flood-peak discharge about 528.16 m3·s-1. Under the influence of geological and climatic conditions, there are 3 types of source in Haibalo Gully, landslide mass on side bank of gully in valley area, moraine and frozen weathered debris in the high position. The debris flow occurred at the tail of the main rainfall process from the evening of the 27th to the early morning of the 28th. According to the monitoring of 9 rainfall processes in Haibalo Gully Basin from August to October in 2019, we found that the main process of rainfall in this area is 6 hours, and the precipitation increases significantly with the elevation. The heavy rainfall that triggered the debris flow concentrated in the peak ridge area of 4200~4800 m in the west of Haba snow mountain, and the average rainfall was 60.43 mm in the main rainfall process of 6 h. In addition to the rainfall, the excitation factors also contain glacier melt water in the peak ridge area. According to calculation, the average melting water equivalent of the glacier is 17.29 mm during the 6 h rainfall. The achievements of this study can provide a reliable scientific basis for the monitoring, early warning and prevention of the rainfall glacier-malt-water mixed type debris flow in the Hengduan Mountain region of northwest Yunnan.

       

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