Journal of Arid Meteorology ›› 2024, Vol. 42 ›› Issue (5): 813-823.DOI: 10.11755/j.issn.1006-7639-2024-05-0813

• Technical Report • Previous Articles    

Research on risk assessment and early warning method for geological hazards induced by heavy precipitation in Longnan power grid

SUN Tao1(), LI Yue2, WANG Jin3, LI Xiaoqin4(), HE Jinmei4, ZHAO Wenjing4, LYU Meixia4   

  1. 1. State Grid Gansu Electric Power Company, Lanzhou 730030, China
    2. State Grid Lanzhou Power Supply Company, Lanzhou 730070, China
    3. State grid Gansu Electric Power Company Electric Power Science Research Institute, Lanzhou 730070, China
    4. Meteorological Service Center of Gansu Province, Lanzhou 730020, China
  • Received:2024-05-24 Revised:2024-08-30 Online:2024-10-31 Published:2024-11-17

强降水诱发陇南电网地质灾害风险评估及预警方法研究

孙涛1(), 李玥2, 王津3, 李晓琴4(), 何金梅4, 赵文婧4, 吕玫霞4   

  1. 1.国网甘肃省电力公司,甘肃 兰州 730030
    2.国网兰州供电公司,甘肃 兰州 730070
    3.国网甘肃省电力公司电力科学研究院,甘肃 兰州 730070
    4.甘肃省气象服务中心,甘肃 兰州 730020
  • 通讯作者: 李晓琴(1994—),女,甘肃武威人,主要从事专业气象服务。E-mail: lxqin369@163.com
  • 作者简介:孙涛(1982—),男,甘肃兰州人,高级工程师,主要从事电力气象应用研究。E-mail: suntao821115@163.com
  • 基金资助:
    甘肃省青年科技基金项目(22JR5RA756);甘肃省重点研发计划-工业类项目(23YFGA0016);甘肃省气象局人才专项(2425rczx-G-QNQHRC-08);甘肃省科技计划项目(23JRRA1574);甘肃省气象局气象科研重点项目(Zd2022-04)

Abstract:

Geological hazards occur frequently along the transmission lines in Longnan, Gansu, which seriously threaten the safe and stable operation of power lines. In order to effectively improve the disaster prevention and mitigation ability of Longnan power grid, the precipitation data from May to October during 2018 to 2022 were selected to analyze the distribution characteristics of precipitation, and the disaster probability of effective rainfall was used to evaluate the risk of disaster-causing factors of geological hazards. The coupling model of information quantity and analytic hierarchy process was used to evaluate the exposure of pregnant environment, and the simplified evaluation model of geological disaster vulnerability was used to evaluate the vulnerability of disaster-bearing body. The effect of geological disaster risk early warning of power grid induced by heavy precipitation was tested using cases of geological disasters, taking Longnan ±800 kV Qingyu Line and Qishao Line as examples. The results show that the short-term heavy rainfall and rainstorm in Longnan have strong local characteristics, and their frequency increases from northwest to southeast. The disaster sites mostly occur in higher and high risk areas. Most of the disaster sites of geological disasters are located in the areas with higher elevation and steeper slope, and the north and south slope as well as convex slope are the main slopes. The geological disasters are easy to occur in the areas with dry land, moderate vegetation coverage and below, and 67.4% of the disaster sites is located in the areas with higher exposure. Longnan ±800 kV Qingyu Line and Qishao Line are not in the area of extremely high exposure degree and vulnerability. The meteorological risk model of geological disaster can capture the dense geological disaster events, and the probability of disaster caused by effective rainfall has a good effect on the early warning of geological disasters induced by precipitation.

Key words: geological hazards, Longnan, electric transmission line, heavy precipitation

摘要:

陇南输电线路沿线地质灾害频发易发,严重威胁线路安全稳定运行。为有效提升陇南电网防灾减灾能力,选取2018—2022年5—10月降水数据,利用降水分布特征和有效雨量致灾概率评估地质灾害致灾因子危险性,利用信息量-层次分析耦合模型评估孕灾环境暴露度,利用地质灾害脆弱性简化评估模型评估承灾体脆弱性,并以陇南±800 kV青豫线、祁韶线为例,利用地质灾害个例检验强降水诱发电网地质灾害风险预警效果。结果表明,陇南短时强降水和暴雨局地性强,发生频次自西北向东南呈增加趋势,灾情点大多发生在较高和高危险性区域。地质灾害灾情点大多位于海拔较高、坡度较陡区域,易发坡向为北坡、南坡并以凸型坡为主,旱地、中度及以下植被覆盖度区域地质灾害易发,67.4%的灾情点位于较高暴露度以上区域。陇南±800 kV青豫线、祁韶线电线杆塔不处于极高暴露度与极高脆弱性区域。地质灾害气象风险模型能够捕捉到较密集的地质灾害事件,有效雨量致灾概率对降水诱发的地质灾害预警效果较好。

关键词: 地质灾害, 陇南, 输电线路, 强降水

CLC Number: