陇南市武都区东江镇地质灾害发育特征及形成条件研究
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摘要
东江镇位于陇南市武都区东部,白龙江自西北至东南贯穿研究区。该区总面积为15.2 km~2,地势总体呈北部高、南部低,地貌类型分别为侵蚀构造中山和侵蚀堆积河谷。区内共发育地质灾害39处。在分析该区域地质灾害发育特征与时空分布情况的基础上,从地形地貌、地层岩性、地质构造、降雨、人类工程活动等方面对其形成条件进行总结研究,结果表明:研究区内地质灾害主要是崩塌、滑坡、不稳定斜坡和泥石流。68%的崩塌、滑坡和不稳定斜坡位于研究区中部的陇南站北侧,而泥石流主要集中在研究区北部的侵蚀构造中山区;区内崩塌、滑坡的主要诱因是人类工程活动和降水;不同地质灾害的形成条件有所差异,研究区内滑坡、崩塌、不稳定斜坡的形成条件主要包括较大临空面、软弱岩组、强烈构造运动、丰富的降雨和地下水储存、地震频发和人类工程活动剧烈等,泥石流的形成条件主要包括陡峻的地形、丰富的固体物质储量、降雨以及人类工程活动。研究结果为区域地质灾害防治和预测预报提供了基础依据。
Dongjiang Town is located in the eastern part of Wudu District, Weinan City. The Bailong River runs through the study area from northwest to southeast. The total area of the area is 15.2 km~2, and the terrain is generally high in the north and low in the south. The landform types are the eroded tectonic mid-mountain and the eroded accumulation valley. There are 39 geological disasters in the area. Based on the analysis of the development characteristics and spatial and temporal distribution of geological disasters in this area, the formation conditions are studied from the aspects of topography, stratum lithology, geological structure, rainfall, human engineering activities, etc. The results show that: geological disasters in the study area Mainly collapses, landslides, unstable slopes and mudslides. 68% of the collapse, landslide and unstable slopes are located on the north side of Weinan Station in the middle of the study area, while the debris flow is mainly concentrated in the mountainous areas of the eroded structure in the northern part of the study area; the main causes of collapse and landslides in the area are human engineering activities and precipitation; The formation conditions of geological disasters are different. The formation conditions of landslides, collapses and unstable slopes in the study area mainly include large aerial surfaces, soft rock groups, strong tectonic movements, abundant rainfall and groundwater storage, frequent earthquakes and humans. Engineering activities are intense, and the formation conditions of debris flows mainly include steep terrain, abundant solid matter reserves, rainfall, and human engineering activities. The research results provide a basis for the prevention and prediction of regional geological disasters.
Dongjiang Town is located in the eastern part of Wudu District, Weinan City. The Bailong River runs through the study area from northwest to southeast. The total area of the area is 15.2 km~2, and the terrain is generally high in the north and low in the south. The landform types are the eroded tectonic mid-mountain and the eroded accumulation valley. There are 39 geological disasters in the area. Based on the analysis of the development characteristics and spatial and temporal distribution of geological disasters in this area, the formation conditions are studied from the aspects of topography, stratum lithology, geological structure, rainfall, human engineering activities, etc. The results show that: geological disasters in the study area Mainly collapses, landslides, unstable slopes and mudslides. 68% of the collapse, landslide and unstable slopes are located on the north side of Weinan Station in the middle of the study area, while the debris flow is mainly concentrated in the mountainous areas of the eroded structure in the northern part of the study area; the main causes of collapse and landslides in the area are human engineering activities and precipitation; The formation conditions of geological disasters are different. The formation conditions of landslides, collapses and unstable slopes in the study area mainly include large aerial surfaces, soft rock groups, strong tectonic movements, abundant rainfall and groundwater storage, frequent earthquakes and humans. Engineering activities are intense, and the formation conditions of debris flows mainly include steep terrain, abundant solid matter reserves, rainfall, and human engineering activities. The research results provide a basis for the prevention and prediction of regional geological disasters.
引文
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[2]贾丽娜,王勇,王得双.浅析高位滑坡-碎屑流的形成机理及灾害链分析[J].甘肃科技.2018.34(20):23-25.
[3]冯军,尚学军,樊明,等.陇南地质灾害降雨区划及临界雨量研究[J].干旱气象.2006(04):20-24.
[4]侯云龙,张永军.陇南市地质灾害发育规律及其影响因素[J].甘肃地质.2007(Z1):67-70.
[5]李永进,叶伟林.5·12汶川地震在武都区造成灾害的特点分析[J].甘肃科学学报.2009.21(02):29-32.
[6]朱文忠,石跃华,田万生.甘肃省西和县地质灾害发育分布特征及形成条件分析[J].甘肃科技.2004(08):107-109.
[7]崔中兴,柴军瑞,许彦卿.西北地区水库黄土库岸稳定分析[J].水土保持通报.2004.24(1).
[8]杜飞,任光明,夏敏,等.地震作用诱发老滑坡复活机制的数值模拟[J].山地学报.2015.33(02):233-239.
[9]袁斌,和法国,李军鹏,等.甘肃武都区泥石流活动与降雨特征关系[J].兰州大学学报(自然科学版).2012.48(06):15-20.
[10]罗鸿东,徐亚杏,王威.武都区北峪河流域泥石流成灾前期有效降雨量研究[J].中国农村水利水电.2014(03):25-27.
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