Transportation in the Siliguri Corridor, West Bengal, India: distribution characteristics, trafficability, and geological environment
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摘要: 基于33景高分一号(GF-1)和高分二号(GF-2)卫星多光谱遥感影像(覆盖面积154 814 km2),对西里古里走廊地区开展了遥感解译工作,获取了该地区各级公路里程数、路网密度、分布情况等要素,掌握了该地区道路交通的总体特征。在此基础之上,选取了西里古里走廊特定重点区域,以地貌、断裂构造、岩性、地质灾害发育程度、道路状况等要素作为因子进行加权打分,评估了重点区道路交通的通行能力。进一步地,抓取了重点区19个关键节点,运用复杂网络理论进行定量运算,得出了关键节点全网效率变化量ΔE和全网效率相对下降率e等参量,这些参量表征了各关键节点对于整体路网通行性的重要程度。对于重要性位于前列的4个关键节点,开展了解剖研究,分析了关键节点周缘重要目标、坡度、工程岩土体类型等地质环境特点,提出了潜在灾害及隐患。Abstract: Remote sensing interpretation of the Siliguri Corridor, West Bengal, India was carried out based on 33 scenes of multispectral remote sensing images from GF-1 and GF-2 satellites, which cover an area of 154 814 km2. As a result, the mileage, density, and distribution of highways at all levels in the Siliguri Corridor were obtained, and the overall characteristics of the transportation in the area were ascertained. Then this paper assessed the trafficability in the selected key areas using the weighted scoring method from the aspects such as landform, lithology, geologic disasters, and road conditions. Furthermore, the factors such as the variation and relative decrease rate of whole network’s efficiency (ΔE and e) of 19 pivotal nodes were calculated using the complex network theory. They can be used to characterize the importance of pivotal nodes relative to the overall trafficability of the road network. For the four most important pivotal nodes, the geological environment characteristics (i.e., important targets, slope, and engineering rock and soil masses in the peripheries of the nodes) were analyzed and potential disasters and risks were proposed.
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