雅安市雨城区陇西河小流域地质灾害防治体系及效果评价
发布时间：2019-05-12 14:49
【摘要】：“4.20”芦山地震对雅安市雨城区地质环境造成严重破坏,引发了滑坡、崩塌、泥石流等次生地质灾害,特别是在余震、降雨等作用下这些次生灾害更是频繁发生,对雨城区灾后恢复重建工作带来严重危害。雅安市雨城区地处岷江流域,区域内发育青衣江、周公河、陇西河等河流,其他支流众多,水系发育。雨城区位于“4.20”地震的重灾区,地震灾害严重,地质灾害发育,主要分布在陇西河流域,其地质环境条件较复杂,是灾害重灾区和地质灾害的易发区,河流侵蚀切割强烈,地形较为陡峻,境内大面积出露松散软弱的第三系和第四系地层,地层岩性和地质构造较为复杂,加之“5.12”、“4.20”两次地震及震后多次强降雨的综合影响,境内地质灾害较为发育,危害较为严重。陇西河小流域内50处地质灾害隐患点共计威胁住户373户1961人,财产9655万元;灾后重建新村聚居点威胁住户220户720人,财产4400万元;陇西河上里场镇岸坡威胁住户265户764人,共计资产7000万元,地质灾害综合防治工程投资估算为21055万元,通过综合防治,能有效保护上述地质灾害危险区人们生命财产安全,其防治资金投入大于保护的资产,因此,对陇西和小流域地质灾害进行综合防治是非常有必要且紧迫的。且综合治理工程具有一定的经济效益。更重要的是,通过综合防治工程的实施,可以提高地质灾害防治水平和能力,并为场镇恢复重建奠定良好基础,为雨城区北部的旅游开发和产业发展提供安全的环境,由此还将带来更大的间接效益。本次的研究是在前期“4.20”地震地质灾害应急排查和“7.8洪灾”地质灾害应急排查的基础上,以陇西河小流域范围内因自然因素形成的威胁群众生命财产安全的地质灾害隐患点为工作对象,合理确定陇西河小流域地质灾害综合防治工作范围,全面调查或复核已有或新增地质灾害隐患点的发育特征,已有灾害点的分布与类型,规模,变形破坏,稳定性,危害特征等,以保证群众生命财产安全为首要目标,兼顾保证区内经济社会发展空间,结土地利用价值和生态环境保护,总结出小流域的综合治理措施建议,其可实施性,实施后所达到的效果,从而提炼出一套小流域地质灾害综合治理相应的方法和体系。
[Abstract]:The "4.20" Lushan earthquake caused serious damage to the geological environment in Yucheng District of Ya'an City, causing secondary geological disasters such as landslides, landslides and debris flows, especially under the action of aftershocks and rainfall, which occurred frequently. It brings serious harm to the post-disaster recovery and reconstruction of Yucheng District. Yucheng District of Ya'an City is located in Minjiang River Basin. Qingyi River, Zhougong River, Longxi River and other rivers are developed in the region. Yucheng District is located in the heavy disaster area of "4.20" earthquake, the earthquake disaster is serious, the geological disaster is developed, mainly distributed in Longxi River Basin, its geological environment condition is more complex, is the disaster area and the geological disaster prone area. The river erosion and cutting is strong, the terrain is steep, the area of the territory is exposed to loose and weak Tertiary and Quaternary strata, and the strata lithology and geological structure are more complex, coupled with "5.12". The comprehensive influence of "4.20" earthquakes and heavy rainfall after the earthquake shows that the geological disasters in China are more developed and the harm is more serious. A total of 1961 households with 96.55 million yuan were threatened by 50 hidden geological hazard sites in Longxi River Basin, 720 households and 44 million yuan in property were threatened by the reconstruction of new village settlements after the disaster, and the hidden dangers of geological hazards in 50 hidden geological hazard sites in Longxi River Basin threatened 1961 households with 96.55 million yuan in property. The bank slope of Shanglichang Town, Longxi River, threatened 764 households, with a total asset of 70 million yuan, and the investment in the comprehensive prevention and control project of geological disasters was estimated to be 210.55 million yuan. Through the comprehensive prevention and control, the safety of people's lives and property in the above-mentioned geological hazard risk areas can be effectively protected. The investment of prevention and control funds is greater than the protected assets, so it is very necessary and urgent to carry out comprehensive prevention and control of geological disasters in Longxi and small watershed. And the comprehensive treatment project has certain economic benefits. More importantly, through the implementation of comprehensive prevention and control projects, we can improve the level and ability of geological disaster prevention and control, lay a good foundation for the restoration and reconstruction of the town, and provide a safe environment for tourism development and industrial development in the northern part of Yucheng District. This will also bring greater indirect benefits. This study is based on the early "4.20" earthquake geological disaster emergency investigation and the "7.8 flood" geological disaster emergency investigation. Taking the hidden points of geological disasters which threaten the safety of the lives and property of the masses, which are formed by natural factors in the scope of Longxi River small watershed, as the working object, the scope of comprehensive prevention and control of geological disasters in Longxi River small watershed is reasonably determined. To comprehensively investigate or review the development characteristics of hidden danger points of existing or new geological disasters, the distribution and type, scale, deformation and destruction, stability and hazard characteristics of existing disaster points, with the primary goal of ensuring the safety of the lives and property of the masses. Taking into account the guarantee of economic and social development space in the area, the value of land use and the protection of ecological environment, this paper sums up the suggestions of comprehensive control measures for small watersheds, their feasibility and the effects achieved after their implementation. Thus, a set of methods and systems for comprehensive management of geological disasters in small watersheds are extracted.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P694
[Abstract]:The "4.20" Lushan earthquake caused serious damage to the geological environment in Yucheng District of Ya'an City, causing secondary geological disasters such as landslides, landslides and debris flows, especially under the action of aftershocks and rainfall, which occurred frequently. It brings serious harm to the post-disaster recovery and reconstruction of Yucheng District. Yucheng District of Ya'an City is located in Minjiang River Basin. Qingyi River, Zhougong River, Longxi River and other rivers are developed in the region. Yucheng District is located in the heavy disaster area of "4.20" earthquake, the earthquake disaster is serious, the geological disaster is developed, mainly distributed in Longxi River Basin, its geological environment condition is more complex, is the disaster area and the geological disaster prone area. The river erosion and cutting is strong, the terrain is steep, the area of the territory is exposed to loose and weak Tertiary and Quaternary strata, and the strata lithology and geological structure are more complex, coupled with "5.12". The comprehensive influence of "4.20" earthquakes and heavy rainfall after the earthquake shows that the geological disasters in China are more developed and the harm is more serious. A total of 1961 households with 96.55 million yuan were threatened by 50 hidden geological hazard sites in Longxi River Basin, 720 households and 44 million yuan in property were threatened by the reconstruction of new village settlements after the disaster, and the hidden dangers of geological hazards in 50 hidden geological hazard sites in Longxi River Basin threatened 1961 households with 96.55 million yuan in property. The bank slope of Shanglichang Town, Longxi River, threatened 764 households, with a total asset of 70 million yuan, and the investment in the comprehensive prevention and control project of geological disasters was estimated to be 210.55 million yuan. Through the comprehensive prevention and control, the safety of people's lives and property in the above-mentioned geological hazard risk areas can be effectively protected. The investment of prevention and control funds is greater than the protected assets, so it is very necessary and urgent to carry out comprehensive prevention and control of geological disasters in Longxi and small watershed. And the comprehensive treatment project has certain economic benefits. More importantly, through the implementation of comprehensive prevention and control projects, we can improve the level and ability of geological disaster prevention and control, lay a good foundation for the restoration and reconstruction of the town, and provide a safe environment for tourism development and industrial development in the northern part of Yucheng District. This will also bring greater indirect benefits. This study is based on the early "4.20" earthquake geological disaster emergency investigation and the "7.8 flood" geological disaster emergency investigation. Taking the hidden points of geological disasters which threaten the safety of the lives and property of the masses, which are formed by natural factors in the scope of Longxi River small watershed, as the working object, the scope of comprehensive prevention and control of geological disasters in Longxi River small watershed is reasonably determined. To comprehensively investigate or review the development characteristics of hidden danger points of existing or new geological disasters, the distribution and type, scale, deformation and destruction, stability and hazard characteristics of existing disaster points, with the primary goal of ensuring the safety of the lives and property of the masses. Taking into account the guarantee of economic and social development space in the area, the value of land use and the protection of ecological environment, this paper sums up the suggestions of comprehensive control measures for small watersheds, their feasibility and the effects achieved after their implementation. Thus, a set of methods and systems for comprehensive management of geological disasters in small watersheds are extracted.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P694
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