318国道川藏段是中国著名的旅游廊道和典型的灾害高发区,加强沿线主要旅游线路的雨涝危险性研究对提升沿线旅游业应对自然灾害能力具有重要意义.本研究运用基于密度的层次聚类(Hierarchical Density-Based Spatial Clustering of Applications with Noise,HDBSCAN)从2013-2021年21 125条游客轨迹中提取出318国道川藏段主要旅游线路,分析了主要旅游线路的雨涝危险性.结果表明:(1)318国道川藏段的主要旅游线路有8条,线路二(山南市贡嘎县—拉萨市达孜区)和线路五(雅安市石棉县—甘孜州康定市)是典型的跨市域旅游线路.(2)2019-2021年川藏段沿线年均降水量比2013-2015年增加0.99 mm,1-12月川藏段沿线的月均降水量增加6.3 mm.2013-2021年川藏段雨涝灾害累计发生频次比991-1949年减少5次,7月达到全年峰值(7.51次),1月、2月和12月为全年低值(0次).(3)2013-2021年线路三的雨涝危险性等级最高,线路一和线路二的雨涝危险性等级最低.(4)线路一和线路二在1-12月为低雨涝危险性线路,线路三、线路七和线路八在5月为高雨涝危险性线路.
The analysis of rainstorm and flooding hazard of tourism routes along the Sichuan-Tibet section of National Highway 318 based on multisource data
The Sichuan-Tibet section of National Highway 318 is a famous tourism corridor and a typical disaster prone area in China.Strengthening the study of heavy rainstorm and the risk of secondary derivative disasters triggered by it in this region is of great significance to comprehensively improve the ability of the tourism industry to cope with natural disasters along the route.In this paper,the Hierarchical Density-Based Spatial Clustering of Applications with Noise(HDBSCAN)model was used to extract the main tourism routes along the Sichuan-Tibet section of the National Highway 318 from 21 125 tourist trajectories from 2013 to 2021,and the rainstorm and flood hazard on the main tourism routes were analyzed.The results show that,(1)there are eight main tourism routes on the Sichuan-Tibet section of the National Highway 318.Route 2(Gongga County,Shannan City to Dazi District,Lhasa City)and Route 5(Shimian County,Ya'an to Kangding City,Ganzi Tibetan Autonomous Prefecture)are typical cross-city tourist routes.(2)The average annual precipitation along the Sichuan-Tibet section in 2019-2021 is 0.99 mm higher than that in 2013-2015,and the average precipitation in January-December is 6.3 mm higher.The cumulative frequency of rainstorm and flooding along the Sichuan-Tibet section is 5 times lower than that in the period of 991-1949,and the annual peak is reached in July(7.51 times),with January,February and December is the annual low value(0 times).(3)Route 3 has the highest risk of rainstorm and flooding hazard for 2013-2021,and Route 1 and Route 2 have the lowest level of rainstorm and flooding hazard.(4)Route 1 and Route 2 have the lowest rainstorm and flood hazard risk from January to December,and Route 3,Route 7,and Route 8 have the highest rainstorm and flood hazard risk in May.
tourism routerainstorm and floodinghazardtrajectory data miningSichuan-Tibet section of National Highway 318
万方数据
维普
