Characteristics of Debris Flow in the Red Bed Area of Western Sichuan: A Case Study of Wangjiapogou, Qunying Village, Dechang County
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摘要: 2022 年8 月23 日德昌县乐跃镇群英村王家坡沟暴发群发性泥石流灾害，导致群英村至太平村的乡道严重堵塞，乡道两侧的耕地及经济作物大面积受毁。为揭示此次群发性泥石流的发育规律，本文结合实地调查和遥感影像对王家坡泥石流的形成机制、动力学特征进行综合研究。研究结果表明：此次泥石流在短历时强降雨情况下，坡面入渗迅速形成地表径流聚集于沟道，水流沿程掏蚀、侧蚀沟道岸坡形成大量的沟道松散固体物质，泥石流规模呈放大趋势冲出沟口形成泥石流灾害。该泥石流沟松散堆积物动储量为1.21×104m3，主要分为沟道物源、崩滑物源、侵蚀物源3 种物源类型，其中沟道物源占比最大；最后计算了不同暴雨频率条件下泥石流的流量以及冲击力，为王家坡泥石流灾害防治提供可靠的数据和相应的防治措施。Abstract: On August 23, 2022, a mass debris flow demage occured in Qunying Village, Leyue Town, Dechang County, resulting in serious blockage of the village road from Qunying Village to Taiping Village, and ruination of large areas of arable cash crops on both sides of the road. In order to reveal the development law of the mass debris flow, the formation mechanism and dynamic characteristics of the debris flow in Wangjiapo were comprehensively studied by combining field investigation and remote sensing images. The research results show that in the short duration of heavy rainfall, the quickly formed surface runoff after the infiltration of water into the slope gathered in the gully, then the water along cut andside eroded the gully bank and slope and formed a large number of loose solid material, resulting debris flow damage after the rising large scale debris flow ran out of the gully mouth. The dynamic reserves of loose accumulation in the debris flow gully are 1.21×104m3, which can be divided into three provenances: gully provenances, landslide provenances and erosion provenances, among which gully provenances account for the largest proportion. Finally, the flow and impact force of debris flow under the condition of different rainstorm frequency are calculated to provide reliable data and corresponding prevention and control measures for debris flow demage prevention inWangjiapo Gully.
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Key words:
- debris flow /
- red layer /
- dynamic characteristics /
- Dechang County,Western Sichuan Province /
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