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藏北高原班戈县地质灾害综合风险评价

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区域地质灾害风险评价虽然开展多年,但是由于地质灾害危险性难以评价和量化,承灾体数据难以调查和获取,区域风险评价的质量和精度一直不高,研究进展缓慢;更兼藏北高原自然条件恶劣、高寒缺氧、山峰多为冰川所覆盖,大部分地区人迹罕至,研究程度极低,基础地质资料及地质灾害研究成果相对匮乏,区域地质灾害风险评价接近空白,难以满足地方政府减灾防灾和应急管理的需求.本文以西藏自治区那曲市班戈县为研究区域,利用2020年、2021年的高分一号、高分二号遥感影像数据及GIS空间分析技术,基本查明了班戈县2.8×104 km2范围内地质灾害的数量、类型、规模、发育特征及分布规律,并采用"信息量法"较为系统地进行了全县地质灾害1∶50 000的风险评价,对全县地质灾害的易发性、危险性、易损性及风险性进行了综合性的评价.研究表明,班戈县由于位于青藏高原台面,地广人稀,地质灾害风险程度总体不高,承灾体主要分布在城镇周边,因此98%的地区为低风险区,中、高风险区主要集中分布在城镇周边;此评价结果为班戈县的地质灾害减灾防灾、风险管控等提供科学依据.
Comprehensive risk assessment of geohazards in Bangor County,northern Tibet Plateau
Although regional geohazard risk assessment has been carried out for many years,due to the difficulty in evaluating and quantifying the risk of geohazards,and the difficulty in investigating and obtaining data from risk elements,the quality of regional risk assessment has always been low,and research progress has been slow.In addition,the natural conditions of the northern Tibetan Plateau are harsh,with high cold and anoxic conditions,and many peaks covered by glaciers.Most areas are rarely visited,and the level of research is extremely low,the basic geological data and research results on geohazards are relatively scarce,and the risk assessment of regional geohazards is close to blank,making it difficult to meet the needs of local governments for geohazards reduction,prevention,and emergency management.This paper takes Bangor County of Nagqu City,Tibet Autonomous Region as the research area.Using remote sensing image data from GF-1 and GF-2 in 2020 and 2021,as well as GIS technology,the number,types,scales,developmental characteristics,and distribution laws of geohazards within a 2.8×104 km2 area of Bangor County are identified.Information volume method is used to systematically carry out high-precision and large-scale risk assessment of geohazards throughout the county.The susceptibility,hazard,vulnerability and risk of geohazards in the entire county are comprehensively evaluated.The study shows that due to its location on the Qinghai-Tibet Plateau and sparse population,the overall level of geohazard risk in Bangor County is not high,with 98%of the area being low-risk zones.Medium and high-risk zones are mainly concentrated around towns.These evaluation results provide scientific basis for reducing and preventing geohazards in Bangor County.

Northern Tibet PlateauGeohazardsInformation volume methodRisk assessment

刘春玲、司维兵、姚翔龙、刘海洋、祁生文

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中国自然资源航空物探遥感中心 北京 100083

山东省第一地质矿产勘查院 济南 250109

中国长江三峡集团有限公司科学技术研究院 北京 101100

中国科学院地质与地球物理研究所页岩气与地质工程重点实验室 北京 100029

中国科学院大学 北京 100049

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藏北高原 地质灾害 信息量法 风险评价

第二次青藏高原综合科学考察研究项目

2019QZKK0904

2024

地质科学
中国科学院地质与地球物理研究所

地质科学

CSTPCD北大核心
影响因子:0.79
ISSN:0563-5020
年,卷(期):2024.59(1)
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