涪江源区韩家沟泥石流防治工程改进前后危险性分析
P694%P642.5; 为了降低涪江源区左岸韩家沟泥石流的危害,文章采用遥感解译、野外调查、FLO-2D数值模拟等手段,查清了韩家沟泥石流特征及其防治现状,认为现有防治工程不能满足防灾需求,并据此提出改进的防治工程,对不同降雨频率下防治工程改进前后的泥石流危险性进行了研究,并分析改进防治工程的有效性.结果表明:韩家沟位于"8·8"九寨沟地震扰动区,震后泥石流物源丰富,导致每逢强降雨时泥石流频发.在 10年一遇降雨频率下,丰河村及平松路均处于低危险区,现有防治工程可有效防治泥石流灾害;在 50年一遇降雨频率下,丰河村处于泥石流高危险区,泥石流冲出排导槽,冲毁平松路,现有防治...
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| Published in | 地质力学学报 Vol. 30; no. 4; pp. 659 - 672 |
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| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国地质科学院地质力学研究所,北京 100081
01.08.2024
中国地质大学(北京),北京 100083 中国地质调查局新构造与地壳稳定性研究中心,北京 100081 中国地质大学(北京),北京 100083%四川省地质矿产勘查开发局物探队,四川成都 610070%中国地质科学院地质力学研究所,北京 100081 自然资源部活动构造与地质安全重点实验室,北京 100081 中国地质调查局新构造与地壳稳定性研究中心,北京 100081%中国地质科学院地质力学研究所,北京 100081 中国地质大学(北京),北京 100083%中国地质科学院地质力学研究所,北京 100081 |
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| Online Access | Get full text |
| ISSN | 1006-6616 |
| DOI | 10.12090/j.issn.1006-6616.2023097 |
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| Abstract | P694%P642.5; 为了降低涪江源区左岸韩家沟泥石流的危害,文章采用遥感解译、野外调查、FLO-2D数值模拟等手段,查清了韩家沟泥石流特征及其防治现状,认为现有防治工程不能满足防灾需求,并据此提出改进的防治工程,对不同降雨频率下防治工程改进前后的泥石流危险性进行了研究,并分析改进防治工程的有效性.结果表明:韩家沟位于"8·8"九寨沟地震扰动区,震后泥石流物源丰富,导致每逢强降雨时泥石流频发.在 10年一遇降雨频率下,丰河村及平松路均处于低危险区,现有防治工程可有效防治泥石流灾害;在 50年一遇降雨频率下,丰河村处于泥石流高危险区,泥石流冲出排导槽,冲毁平松路,现有防治工程不能满足要求.采用多级拦挡坝、排导槽截弯取直等改进的防治工程后,可有效预防泥石流对沟口下方承灾体的损害,泥石流堆积方量减少 50.2%,堆积面积减少 86%,高危险区均位于排导槽内,治理效果显著. |
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| AbstractList | P694%P642.5; 为了降低涪江源区左岸韩家沟泥石流的危害,文章采用遥感解译、野外调查、FLO-2D数值模拟等手段,查清了韩家沟泥石流特征及其防治现状,认为现有防治工程不能满足防灾需求,并据此提出改进的防治工程,对不同降雨频率下防治工程改进前后的泥石流危险性进行了研究,并分析改进防治工程的有效性.结果表明:韩家沟位于"8·8"九寨沟地震扰动区,震后泥石流物源丰富,导致每逢强降雨时泥石流频发.在 10年一遇降雨频率下,丰河村及平松路均处于低危险区,现有防治工程可有效防治泥石流灾害;在 50年一遇降雨频率下,丰河村处于泥石流高危险区,泥石流冲出排导槽,冲毁平松路,现有防治工程不能满足要求.采用多级拦挡坝、排导槽截弯取直等改进的防治工程后,可有效预防泥石流对沟口下方承灾体的损害,泥石流堆积方量减少 50.2%,堆积面积减少 86%,高危险区均位于排导槽内,治理效果显著. |
| Abstract_FL | [Objective]Debris flow from the Hanjia gully develops on the left bank of the source area of the Fujiang River,Fenghe Village,Xiaohe Town,Songpan County,China.In recent years,debris flows have occurred frequently,and the largest debris flow occurred in August 2022,which seriously threatened the lives and properties of villagers in the Hanjia gully.Existing prevention and control engineering methods have decreased in effectiveness or even become ineffective.Currently,researchers have set a variety of extreme rainfall conditions and used FLO-2D to analyze the hazards of debris flow,based on which the governance effect of debris flow prevention and control engineering can be evaluated.However,there are few reports on how to improve the prevention and control engineering and evaluate the effect of the improved prevention and control engineering when the existing prevention and control engineering is ineffective.[Methods]To reduce damage to the Hanjia gully,the characteristics as well as prevention and control status of the debris flow in/from this gully were determined using remote sensing interpretation,field investigation,and FLO-2D numerical simulation;subsequently,improved prevention and control engineering was proposed.The hazard of debris flow before and after the improvements in prevention and control engineering under different rainfall frequencies were studied to analyze the effectiveness of the improved prevention and control engineering.[Results]The results show that the Hanjia gully is located in the"8.8"Jiuzhaigou earthquake disturbance area,the static reserves of post-earthquake landslides and collapses are about 49.79×104 m3,and the debris flow sources are abundant,which leads to frequent debris flow during heavy rainfall.The high-hazard area is concentrated in the No.1 retaining dam,and Fenghe Village and Pingsong Highway are in the low-hazard area under a rainfall event occurring every 10 years,and the existing prevention and control engineering can effectively prevent the debris flow disaster.Under a rainfall event occurring once in 50 years,Fenghe Village is in the high-hazard area of debris flow.The debris flow rushes out of the drainage channel and destroys the Pingsong Highway.The maximum mud depth in the accumulation area increases from 1.41 m to 3.14 m,the maximum velocity increases from 2.4 m/s to 3.65 m/s,and the accumulation area increases from 0.28×104 m2 to 5.41×104 m2.However,the existing prevention and control engineering methods cannot meet these requirements.After adopting improved prevention and control engineering,such as multistage retaining dams and cutting and straightening of drainage channels,the flow velocity of the debris flow in front of the two additional retaining dams becomes lower than that before the improvement,and the depth of mud in front of the additional retaining dams becomes higher than that before the improvement.The maximum velocity of the debris flow within 100 m of Dam No.3 decreases by 29%,and the maximum mud depth increases by 413%.The maximum flow velocity in the first 100 m of Dam No.2 decreases by 21%,the maximum mud depth increases by 175%,the maximum mud depth in the accumulation area is 3.9 m,and the maximum flow velocity is 3.4 m/s.The accumulation volume of debris flows is reduced by 50.2%,and the accumulation area is reduced by 86%.[Conclusion]Improved prevention and control engineering can effectively reduce the solid mass of debris flows and guide debris flow to discharge along drainage channels.The high-hazard area of the debris flow is concentrated in the drainage channel,and the control effect of the debris flow is remarkable.[Significance]The research results provide a scientific method for evaluating the effectiveness of debris-flow control engineering improvements and offer technical support for local debris-flow early warning systems. |
| Author | 徐传成 杨为民 唐海兵 吴建军 渠敬凯 马思琦 张春山 |
| AuthorAffiliation | 中国地质科学院地质力学研究所,北京 100081;自然资源部活动构造与地质安全重点实验室,北京 100081;中国地质调查局新构造与地壳稳定性研究中心,北京 100081;中国地质大学(北京),北京 100083%四川省地质矿产勘查开发局物探队,四川成都 610070%中国地质科学院地质力学研究所,北京 100081;自然资源部活动构造与地质安全重点实验室,北京 100081;中国地质调查局新构造与地壳稳定性研究中心,北京 100081%中国地质科学院地质力学研究所,北京 100081;自然资源部活动构造与地质安全重点实验室,北京 100081;中国地质大学(北京),北京 100083%中国地质科学院地质力学研究所,北京 100081;中国地质大学(北京),北京 100083 |
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| Author_FL | YANG Weimin QU Jingkai WU Jianjun ZHANG Chunshan XU Chuancheng TANG Haibing MA Siqi |
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| Keywords | improving prevention and control engineering 治理效果 rainfall 泥石流 engineering geology governance effect 改进防治工程 debris flow 降雨 geological hazards 地质灾害 工程地质 |
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| Title | 涪江源区韩家沟泥石流防治工程改进前后危险性分析 |
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