| 屈永平,唐川,卜祥航,向国萍,贾涛.石棉县熊家沟“7·04”泥石流堵江调查与分析[J].水利学报,2016,47(1):44-53 |
| 石棉县熊家沟“7·04”泥石流堵江调查与分析 |
| Survey and analysis of the“7·04”river-blocking debris flow of Xiongjia Gully in Shimian county,Sichuan province |
| 投稿时间：2015-06-03 |
| DOI：10.13243/j.cnki.slxb.20150625 |
| 中文关键词: 纵坡 堵江 容重 中值粒径 衰减系数 |
| 英文关键词: longitudinal slope river-blocking bulk density median diameter attenuation coefficient |
| 基金项目:科技部科技基础性专项课题(2011FY110100);中国地质调查局项目(12120113009900) |
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| 中文摘要: |
| 汶川“5·12”地震以来,四川地区地质构造活动进入活跃期。而芦山“4·20”地震后,雅安地区地质灾害进入高发期。2013年7月4日20时,四川省雅安市石棉县熊家沟暴发了大规模泥石流过程,堵塞竹马河,造成重大经济损失和人员伤亡。为了研究地震后熊家沟泥石流的堵江特征及其防止措施,通过泥石流流域野外调查,发现由于石-甘公路,特别是竹马河的河堤工程,使得熊家沟堆积区地形纵坡突增泥石流在其堆积区运动时,其汇入主河的运动方式发生突变。根据堵江型泥石流堆积区的纵坡变化特征,将该泥石流定义为工程纵坡增加型堵江泥石流。而对比熊家沟“7·04”泥石流物源的前后变化情况,可知其泥石流物源的平均转化率为0.307,且位于下游的泥石流物源更容易被侵蚀。通过熊家沟“7·04”泥石流的水上和水下堆积物筛分试验,发现其中值粒径 d60增加值为3.4%,容重增加了3%。运用 Spss 统计软件和理论分析,得到工程纵坡增加型堵江泥石流的流速、流量与流域特征的关系,及其等衰减特征,为该区泥石流的类型研究及其防治提供一定依据。 |
| 英文摘要: |
| Since the“5·12”Wenchuan earthquake, the geological tectonic activities in Sichuan area have happened frequently. After the“4·20”Lushan earthquake, the geological disasters in Yaan district entered a frequent period. On July 4, 2013, a debris flow in Xiongjia gully was broken out at 20:00, and the Zhuma River was blocked, which causes great economic loss and casualties. In order to study the river-blocking characteristics and the prevention measures of debris flow in Xiongjia gully,through field investigation,it is found that the longitudinal slope of terrain in alluvial fan zone increases suddenly,which triggers the mutations of debris flow movement in this area, because of the Shi-Gan highway and especially the river embankment engineering of the Zhuma River. This kind of debris flow is defined as an engineering increasing longitudinal slope type of river-blocking,according to the longitudinal slope variation characteristics of debris flow in the accumulation area. Investigating the changes of the provenance of pre and post the“7·04”debris flow in the study area, it is found that the average conversion rate of sediment source to debris flow is 0.307, and the debris flow provenance located in the downstream is eroded more easily. According to the screening test of deposits of up-water and under-water of debris flow, the flow density increased by 3% , and that the median diameter d60 increased by 3.4%. Using the Spss statistical software and theoretical analysis, the relationship has been obtained between debris flow velocity, flow and drainage basin, and its attenuation characteristics, which provide a certain gist for the debris flow type and its prevention and control in the study area. |
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