金沙江白格堰塞体结构形态与溃决特征研究
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摘要
四川、西藏交界处的金沙江右岸白格村所在岸坡于2018年10月10日和11月3日发生两次失稳滑坡,堵塞金沙江形成堰塞湖。在介绍堰塞湖形成过程及成因的基础上,分析了堰塞体结构及形态特征、溃决发展阶段、溃决特征值,并将这些特征参数与以往一些堰塞湖作了比较。分析表明:该堰塞体总体由细颗粒组成,表面及下游侧粗颗粒增加,抗冲性差、库容、来水量及堰塞体物质组成是决定溃决峰值流量的关键因素,来水量、堰塞体抗冲性及堰塞体溃流段长度是决定坝体溃决时长的关键因素。
2 barrier lakes formed on the Jinsha River in Tibet due to twice landslides of bank slope at Baige village in Oct. and Nov. of 2018. Firstly we analyze the landslide cause and the formation process of the barrier lake, then we study some characteristic values of the barrier lake such as structure, morphology, development of dam breaking and dam breaking stages, and these characteristic values were compared with the ones of previous dams. The investigation shows that the barrier body is mainly composed of fine particles, and proportion of coarse particles is larger on the surface and downstream of the barrier body. The poor erosion-resistant, storage volume, incoming flow and material composition are the main factors influencing the peak flow, and the incoming flow, erosion resistant of dam material and path length of the break section are the key factors for dam breaking duration.
2 barrier lakes formed on the Jinsha River in Tibet due to twice landslides of bank slope at Baige village in Oct. and Nov. of 2018. Firstly we analyze the landslide cause and the formation process of the barrier lake, then we study some characteristic values of the barrier lake such as structure, morphology, development of dam breaking and dam breaking stages, and these characteristic values were compared with the ones of previous dams. The investigation shows that the barrier body is mainly composed of fine particles, and proportion of coarse particles is larger on the surface and downstream of the barrier body. The poor erosion-resistant, storage volume, incoming flow and material composition are the main factors influencing the peak flow, and the incoming flow, erosion resistant of dam material and path length of the break section are the key factors for dam breaking duration.
引文
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