Journal of Geo-information Science >
Research on Route of Mountain Flood Disaster Avoidance based on Equivalent Distance Algorithm
Received date: 2021-10-13
Request revised date: 2021-11-20
Online published: 2022-07-25
Supported by
Meteorological Disaster Monitoring and Early Warning Project of Hebei Meteorological Disaster Prevention Center-Project of Compiling Meteorological Disaster Risk Map of Mountain Villages(2211042001101)
Digital Fujian Institute of Meteorological Big Data (Minnan Normal University) Open Fund(202010701)
Copyright
The ability of disaster prevention and mitigation in mountainous and rural areas is weak. Mountain flood disasters have strong suddenness, and the response time of disaster avoidance is short, which are likely to cause casualties. Reasonable design of avoidance routes can help reduce losses caused by disasters. Based on GIS, this paper designs disaster avoidance routes in Tianbaizhi Village, Xingtai City, in the Hebei Province. The Digital Elevation Model (DEM) and orthophoto of the research area are obtained through Unmanned Aerial Vehicle (UAV) photogrammetry. Factors that influence disaster avoidance route planning including slope, cost distance, and function of cost path are used to calculate the initial avoidance route in the mountainous areas. The area where the mountain flood ditch is located and the area with a large slope are used as the interrupted area of the disaster avoidance route. The existing mountain roads are fully considered and rationally used to optimize the final disaster avoidance route. Based on the distance and average slope of the disaster avoidance route, the disaster avoidance route obtained by this method is quantitatively compared with the original disaster avoidance route. The result shows that (1) Among the 20 long-distance disaster avoidance routes designed, this method shortens the length of 18 routes, reduces the average slope of 10 routes, and controls the increase of the average slope of the other 8 routes within 2°; (2) Compared with the original route, the maximum length of each route can be shortened by 329.74 m, and the average slope only increases by 0.68°. The disaster avoidance distance is shortened by adding a small amount of average slope, which improves the disaster avoidance efficiency; (3) The length of remaining two routes increases by 15.21 m and 9.57 m, respectively, resulting in an average slope reduction of 8.43° and 1.43°. The average slope of the routes is reduced by adding a small amount of distance, which improves the safety of disaster avoidance routes; (4) The southern part of Tianbaizhi Village is close to the disaster avoidance point, and the avoidance of disasters is relatively difficult. In contrast, the northern part of Tianbaizhi Village has a longer route to the disaster avoidance point. The longest distance is 1210.02 m, and the difficulty of disaster avoidance is greater. The optimized disaster avoidance path has been separated from the barrier area with large slope, and the degree of overlap between disaster avoidance path and the mountain flood ditch is greatly reduced. The method proposed in this study provides a sufficient scientific basis for relevant decision-makers.
ZHANG Chaoqin , XUE Fengchang , CHEN Xiaojuan , LI Ting , HAN Yu , JIANG Jian , TANG Weigan . Research on Route of Mountain Flood Disaster Avoidance based on Equivalent Distance Algorithm[J]. Journal of Geo-information Science, 2022 , 24(5) : 864 -874 . DOI: 10.12082/dqxxkx.2022.210628
表1 避灾路线距离统计Tab. 1 Statistics of the distance of route to avoid disaster (m) |
路径编号 | 原始距离 | 优化后距离 | 距离差 | 路径编号 | 原始距离 | 优化后距离 | 距离差 |
---|---|---|---|---|---|---|---|
1 | 894.76 | 909.97 | 15.21 | 11 | 712.42 | 706.39 | -6.03 |
2 | 1022.30 | 876.60 | -145.70 | 12 | 473.05 | 411.88 | -61.17 |
3 | 1076.39 | 1038.04 | -38.35 | 13 | 434.78 | 295.93 | -138.85 |
4 | 1148.99 | 1111.46 | -37.53 | 14 | 490.02 | 416.61 | -73.41 |
5 | 1258.20 | 1210.02 | -48.18 | 15 | 745.37 | 644.38 | -100.99 |
6 | 1396.12 | 1206.16 | -189.96 | 16 | 399.14 | 376.63 | -22.51 |
7 | 1152.66 | 1094.90 | -57.76 | 17 | 351.64 | 329.77 | -21.87 |
8 | 1029.31 | 699.57 | -329.74 | 18 | 420.65 | 339.46 | -81.19 |
9 | 912.53 | 504.01 | -208.52 | 19 | 304.96 | 215.82 | -89.14 |
10 | 1289.55 | 874.96 | -314.59 | 20 | 241.88 | 251.45 | 9.57 |
表2 避灾路线平均坡度统计Tab. 2 Statistics of the average slope of disaster avoidance route (°) |
路径编号 | 原始平均坡度 | 优化后平均坡度 | 坡度差 | 路径编号 | 原始平均坡度 | 优化后平均坡度 | 坡度差 |
---|---|---|---|---|---|---|---|
1 | 23.38 | 14.95 | -8.43 | 11 | 20.68 | 16.93 | -3.75 |
2 | 19.93 | 21.89 | 1.96 | 12 | 27.44 | 22.44 | -5.00 |
3 | 25.07 | 23.27 | -1.80 | 13 | 25.08 | 27.05 | 1.97 |
4 | 23.43 | 20.62 | -2.81 | 14 | 29.31 | 28.28 | -1.03 |
5 | 26.21 | 19.07 | -7.14 | 15 | 21.70 | 21.57 | -0.13 |
6 | 26.69 | 27.06 | 0.37 | 16 | 11.83 | 8.57 | -3.26 |
7 | 20.30 | 21.13 | 0.83 | 17 | 21.27 | 20.06 | -1.21 |
8 | 17.37 | 18.05 | 0.68 | 18 | 19.82 | 20.01 | 0.19 |
9 | 23.56 | 19.73 | -3.83 | 19 | 18.04 | 19.11 | 1.07 |
10 | 16.93 | 18.06 | 1.13 | 20 | 21.47 | 20.04 | -1.43 |
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