中山大学学报自然科学版 ›› 2016, Vol. 55 ›› Issue (6): 28-34.

• 研究论文 • 上一篇    下一篇

汉江上游汉中市洪水灾害风险评价研究

张国芳,查小春,石晓静,刘嘉慧,姬霖,王光朋   

  1. 陕西师范大学旅游与环境学院, 陕西 西安 710062
  • 收稿日期:2016-02-24 出版日期:2016-11-25 发布日期:2016-11-25
  • 通讯作者: 查小春;E-mail:zhaxch@snnu.edu.cn

Flood hazard risk assessment of Hanzhong city at the upper reaches of Hanjiang River

ZHANG Guofang, ZHA Xiaochun, SHI Xiaojing, LIU Jiahui, JI Lin, WANG Guangpeng   

  1. College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi'an 710062,China
  • Received:2016-02-24 Online:2016-11-25 Published:2016-11-25

摘要:

以县级行政单元为基本评价单元,对汉江上游的陕西省汉中市洪水灾害进行了综合风险评价。在洪水灾害危险性评价中,综合考虑了降水量、降水变率、地形高程、坡度、河网分布等自然因素;在洪水灾害易损性方面,综合考虑了人口密度、单位面积年粮食产量和GDP密度等社会经济因素,运用层次分析方法并结合GIS技术,分别得到洪灾危险性和易损性评价等级图。在此基础上利用GIS方法进行叠加分析,得到汉中市洪灾综合风险评价结果。研究结果表明:汉中市洪水灾害风险主要集中在汉中盆地,且以河流干流为中心向两边递减,汉中市南部、城固县中部、南郑县的东北部等的洪水灾害风险等级最高;勉县、洋县、西乡县洪灾风险等级次之;留坝县的洪水灾害风险等级最低。洪灾风险评价结果与2012年汉中市发生的洪灾情况能较好的吻合。此研究结果可为汉中市制定合理的防洪减灾规划提供科学依据。

关键词: 洪水灾害, 风险评价, 汉江上游, 汉中市, 陕西省

Abstract:

Based on GIS technology, the integrated assessment on flood risk in Hanzhong city in Shaanxi Province was carried out by using administrative county as basic assessment unit. Natural factors including precipitation, precipitation variability, terrain elevation, slope and water system distribution were comprehensively considered in the flood hazard assessment. Socio-economic indicators including population density, annual grain output per unit area and GDP density were analyzed for the flood vulnerability assessment. A map of flood hazard assessment and a map of flood vulnerability assessment are constructed by combining with AHP and GIS technology. Then, superposition analysis method for flood hazard and vulnerability assessment was performed based on GIS technology, and the flood integrated risk assessment of Hanzhong city was obtained. The flood hazard risk of Hanzhong city was concentrated mainly in the Hanzhong basin and declined gradually from basin center to two sides around the main stream. The flood risk level is the highest in the southern part of Hanzhong, in the middle part of Chenggu county and in the northeastern part of Nanzheng county. The low level areas of flood disaster risk were Mian, Xixiang and Yang counties. Liuba county was the lowest in flood hazard risk. The assessment results are corresponding with the flood hazard occurrence in Hanzhong city in 2012, which can provide a scientific basis for making reasonable flood control and mitigation planning in Hanzhong city.

Key words: flood hazard, risk assessment, the upper reaches of Hanjiang River, Hanzhong City, Shaanxi Province

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