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Remote Sensing for Natural Resources    2021, Vol. 33 Issue (3) : 138-147     DOI: 10.6046/zrzyyg.2020421
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Transportation in the Siliguri Corridor, West Bengal, India: distribution characteristics, trafficability, and geological environment
SUN Ang1(), YANG Qinghua1, LIU Zhi2(), CHEN Hua1, JIANG Xiao1, JIANG Shoumin2, BIAN Yu1, TIAN Li2
1. China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
2. Sichuan Geological Survey Institute, Chengdu 610036, China
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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.
Keywords Siliguri Corridor      transportation      distribution characteristics      trafficability      geological environment     
ZTFLH:  TP79  
Corresponding Authors: LIU Zhi     E-mail: sunangjlu@163.com;149275949@qq.com
Issue Date: 24 September 2021
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Ang SUN
Qinghua YANG
Zhi LIU
Hua CHEN
Xiao JIANG
Shoumin JIANG
Yu BIAN
Li TIAN
Cite this article:   
Ang SUN,Qinghua YANG,Zhi LIU, et al. Transportation in the Siliguri Corridor, West Bengal, India: distribution characteristics, trafficability, and geological environment[J]. Remote Sensing for Natural Resources, 2021, 33(3): 138-147.
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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2020421     OR     https://www.gtzyyg.com/EN/Y2021/V33/I3/138
Fig.1  Data distribution
Fig.2  Image comparison before and after data processing
公路等级 特征描述
一级公路 重要城市之间的连接的主干道路及重点工矿区的公路,主要旅游点、进出机场、车站、港口的主干路及其所在地路段,商业网点众多,大型文化娱乐、展览等主要公共场所所在路段,平均人流量为100人次/min以上和公共交通线路较多的路段,主要领导机关、外事机构所在地,地区确定的重点道路、景观道路、快速路
二级公路 连接经济、政治中心或大工矿区等地的主干公路,城市网点较集中、占道路长度60%~70%的路段,公共文化娱乐活动场所所在路段,平均人流量为50~100人次/min的路段,有固定公共交通线路的路段
三级公路 连接县及县级以上城镇一般干线公路,城郊结合部的主要交通路段,居民区和单位相间的路段,商业网点较少的路段,人流量、车流量一般的路段
四级公路 县与乡、镇、村相连接的支线公路及连接乡镇的干线公路,居住区街巷道路,人流量、车流量较少的路段
等外公路 乡村、组之间连接的小路,乡镇与农田、农舍连接的小路,山区或牧区的砂砾石小路
Tab.1  Standard of highway classification
级别 GF-2 GF-1
遥感影像 可解译能力 遥感影像 可解译能力
一级公路 解译道路呈深灰色、浅灰色调,影像上为长条状,可见少量零散的居民地,影纹清晰,位于平原地区,可解译能力强 解译道路呈灰色、暗灰色调,影像上以规则的几何形态以及长条状的纹理为标志,可解译能力中等
二级公路 解译道路呈深灰色、浅灰色调,影像上为长条状,可见密集的居民地,影纹清晰,位于平原地区,可解译能力强 解译道路呈灰白色,影像上为一规则的长直线,位于平原区,两侧分布灰白色点簇状居民,可解译能力中等
三级公路 解译道路呈深灰色、浅灰色调,影像上为长条状,形态曲折,影纹较为清晰,位于山地地区,可解译能力强 解译道路呈灰色、浅灰色,影像上表现为规则的长直线,位于平原区,与周边地物差异不大,可解译能力一般
Tab.2  Comparison of the interpretability of roads of different widths based on GF-1 and GF-2 image
因子类别 评价因子 权重系数 分类 分值
地
质
环
境
特
征		 断裂构造 0.15 发育 40
较发育 60
不发育 100
工程岩性 0.15 破碎 40
较破碎 60
完整 100
地貌 0.2 V形谷,谷底窄,谷坡陡 40
U形谷,谷底较宽,谷坡较缓 60
宽谷 100
地质灾害
发育程度		 0.25 高易发区 40
中易发区 60
低易发区 100
道
路
特
征		 坡度/(°) 0.15 ≤15 100
(15, 25) 60
≥25 40
路面宽度/m 0.1 ≤4 40
(4, 6] 60
(6,8] 80
>8 100
Tab.3  The coefficients and points of the evaluation factor for traffic capacity
Fig.3  Road network distribution in Siliguri Corridor area(1:250 000)
Fig.4  Road network distribution in key area(1:50 000)
Fig.5  Superimposed map of passable capability and geological environment in key area
路段名称 路段平均高程/m 路段高差/m 路段平均坡度/(°) 路段地质灾害描述 通行能力 路段长度/km 占比/%
1(苍古湖)-2(甘托克) 2 618 2 268 26 地质灾害发育,共计9处,包括7处滑坡与2处崩塌 差 54 7
2(甘托克)-3(辛塔姆) 807 1 068 24 地质灾害较发育,共计2处,包括1处滑坡、1处崩塌 较差 383 51
3(辛塔姆)-4(伦格博)-5(瑟佛克) 293 181 22 地质灾害发育,共计7处,包括泥石流1处、滑坡5处、崩塌1处。 中等 180 24
5(瑟佛克)-6(西里古里)-7(潘塞德瓦) 120 74 1 地质灾害不发育 好 139 18
Tab.4  Each section of traffic capacity in key area
节点编号 ΔE e 重要性排名
5 0.004 96 0.053 72 1
6 0.004 12 0.044 66 2
7 0.003 67 0.039 75 3
15 0.002 74 0.029 71 4
Tab.5  Index value after key node invalid in key area
Fig.6  Sketch map of shortest path after different key notes blocked
Fig.7  Geological environment of key note No.5
Fig.8  Geological environment of key note No.6
Fig.9  Geological environment of key note No.7
Fig.10  Geological environment of key note No.15
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