| 黄河流域甘肃段地质灾害发育特征 |
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| 引用本文： | 郭富赟,宋晓玲,刘明霞.黄河流域甘肃段地质灾害发育特征[J].中国地质灾害与防治学报,2021,32(5):130-136. |
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| 作者姓名： | 郭富赟 宋晓玲 刘明霞 |
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| 作者单位： | 甘肃省地质环境监测院，甘肃 兰州 730050 |
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| 基金项目： | 甘肃省科技重大专项-社会发展类（19ZD2FA002）；甘肃省自然资源厅地质灾害调查（20200305） |
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| 摘 要： | 黄河流域甘肃段是甘肃省地质灾害最为集中的区域。截止2019年底，查明地质灾害点共12829处，占全省灾害总量的70.83%。按照水系分布划分，以渭河流域、泾河流域、黄河干流流域最为发育，其他水系次之。依据空间分布特征，划分为永登—靖远等北部泥石流灾害为主的区段、中部崩塌滑坡泥石流集中区段、南部崩塌滑坡泥石流为主的区段和玛曲—碌曲地质灾害轻微发育区段。依据时间分布特征，具有2—5月冻融期、7—9月主汛期两个高发时段。地质灾害具有小灾巨损、群发巨损和链式巨损等致灾特征。单体灾害易形成巨大损失，降雨、地震引发的群发性地质灾害往往损失巨大，同时崩滑流阻断河道形成的堰塞湖风险也常有发生。
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| 关 键 词： | 黄河流域甘肃段 地质灾害 分布 致灾特征 |
| 收稿时间： | 2020-08-25 |
The development characteristics of geological hazards in Gansu segment of the Yellow River basin |
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| Institution: | Geological Environment Monitoring Institute of Gansu Province, Lanzhou, Gansu 730050, China |
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| Abstract: | Gansu section of the Yellow River basin is the most concentrated area of geological disasters in Gansu Province. By the end of 2019, 12829 potential geological hazard points have been identified, accounting for 70.83% of the total number of disasters in Gansu Province. According to the distribution characteristics of water system, Weihe River basin, Jinghe River basin and the Yellow River basin are the most developed, followed by other water systems. According to the spatial distribution characteristics, it can be divided into three sections: the northern Yongdeng—Jingyuan debris flow area, the central and northern landslide debris flow concentrated section, the central and southern collapse landslide debris flow section, and the southern Maqu—Luqu geological disaster development section. In terms of time distribution, there are two high frequency periods: freezing and thawing period from February to May and main flood season from July to September. Geological disasters have the characteristics of small disaster and huge loss, mass damage and chain type huge loss. Single disaster is easy to form huge loss. The mass geological disaster caused by rainfall and earthquake often causes huge loss. At the same time, the risk of dammed lake formed by landslide flow blocking river channel often occurs. |
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