| 四川壤塘县石吾陇沟泥石流启动条件与堵河程度分析 |
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| 引用本文： | 许晓君,胡卸文,许泽鹏,韩雨菲.四川壤塘县石吾陇沟泥石流启动条件与堵河程度分析[J].中国地质灾害与防治学报,2019(3):44-53. |
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| 作者姓名： | 许晓君 胡卸文 许泽鹏 韩雨菲 |
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| 作者单位： | 西南交通大学地球科学与环境工程学院;西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室 |
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| 基金项目： | 国家重点研发计划(2018YFC1505401);国家自然科学基金资助(41731285,41672283) |
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| 摘 要： | 阿坝州壤塘县宗科乡石吾陇沟于2014年历经20年一遇强降雨,暴发了较大规模泥石流,泥石流峰值流量35.38m^3/s,冲出约6000m^3固体物堆积于沟口,造成沟口宗科河堵塞约三分之二。本文在对石吾陇沟的发育特征进行分析和对运动特征参数进行计算的基础上,对吾陇沟在不同频率泥石流规模下的堵河特征进行研究。首先利用已有经验公式对石吾陇沟在不同频率下堵河程度进行判断,其次结合流体动力学软件CFX对石吾陇沟堵河情况进行模拟分析。经验公式和数值模拟结果均表明,20年一遇泥石流会造成主河严重堵塞,与2014年实际情况基本一致;50年一遇泥石流会造成主河堵断。此研究结果可为石吾陇沟泥石流治理提供依据。
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| 关 键 词： | 泥石流 堵河 堵塞系数 数值模拟 |
Incipient Shiwalong gully,motion condition and river-blocking possibility of debris flow,Rangtang County,Sichuan Province |
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| XU Xiaojun,HU Xiewen,XU Zepeng,HAN Yufei.Incipient Shiwalong gully,motion condition and river-blocking possibility of debris flow,Rangtang County,Sichuan Province[J].The Chinese Journal of Geological Hazard and Control,2019(3):44-53. |
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| Authors: | XU Xiaojun HU Xiewen XU Zepeng HAN Yufei |
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| Institution: | (Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;State-Province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway Safety,Southwest Jiaotong University,Chengdu,Sichuan610031,China) |
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| Abstract: | A rainfall of 20-year return period caused a large scale debris flow whose peak discharge was35. 38 m^3/s occurred in Shiwulong gully in 2014,and the two-thirds of the river was blocked by the 6 000 m^3 sediments rushed out from the gully. The development characteristics and dynamical parameters were researched and calculated to study the characteristics of river-blocking caused by debris flow with different frequency. The river-blocking state resulted by different debris flow is analyzed through empirical formula and fluid dynamics software of CFX. And it concluded that the debris flow with a frequency of 20-year return period would cause serious river-blocking which is consistent with the actual situation in 2014,and a 50-year return period would cause completely river-blocking. |
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| Keywords: | debris flow river-blocking empirical formula numerical simulation |
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