青藏高原市域综合交通优势度评价及空间特征——以林芝市为例

doi:10.18306/dlkxjz.2021.08.007

Abstract

Abstract:

The unique natural environment of the Qinghai-Tibet Plateau has restricted the construction and function of its transportation infrastructure. In order to evaluate the traffic facilities on the Qinghai-Tibet Plateau, taking Linzhi City, a typical area of southeastern Tibet with high altitude and uneven terrain, as an example and considering the natural characteristics, various transport modes, transport stability, and location advantage, this study established an evaluation system of comprehensive traffic advantage degree to empirically examine the situation in 2015 and 2020. The results show that: 1) Bayi District, Milin County, and Gongbujiangda County, especially their central towns, have much higher scores in internal traffic function, external traffic function, and location advantage degree, while the values of traffic advantage and many of its indicators in Chayu County and Motuo County are low, and the impact of some key transportation infrastructures such as the G318 Highway (national highway), Linzhi-Lhasa Highway, and Milin Airport is prominent. 2) The results of spatial difference analysis show that the comprehensive traffic advantage degree of Linzhi City is unbalanced, and the county-level gap and spatial polarization effect tend to increase. However, the core-periphery spatial structure is fragmented and interrupted by terrain factors of extreme difference in altitude, and the border area of Linzhi City becomes the weakest part with regard to the comprehensive traffic advantage degree. 3) There is a certain degree of matching between the comprehensive traffic advantage degree and the population distribution as shown by the linear trend line and coupling coordination relationship. Bayi District, Milin Town, and Gongbujiangda Town have reached the high-quality coordination level. However, most of the towns are at the preliminary or intermediate coordination level, while in the border area and areas with severe natural constraints, the coordination degree urgently needs to be optimized. Methodologically, by superimposing regional natural attributes, expanding the evaluation dimension of traffic advantage degree, and integrating various modes of transportation, the comprehensive traffic advantage evaluation conforms to the actual situation of the study area. Regional transport evaluation that incorporates the consideration of natural environment characteristics has practical significance for supporting territorial planning and transportation infrastructure evaluation and management, especially for regions such as the Qinghai-Tibet Plateau.

Key words: comprehensive traffic advantage, evaluation system, spatial characteristics, Qinghai-Tibet Plateau, Linzhi City

MIAO Yi, LU Wenqing, DAI Teqi, SONG Jinping. Comprehensive traffic advantage degree and its spatial characteristics at the prefecture level on the Qinghai-Tibet Plateau: A case study of Linzhi City[J].PROGRESS IN GEOGRAPHY, 2021, 40(8): 1332-1343.

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References 40

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道路分类	速度赋值/(km/h)	平均纵坡/%	坡度影响系数	高程/km	高程影响系数
快、高速铁路	线路设计时速	≤10	1.00	≤3	1.00
(普速)铁路	120	(10, 20]	0.95	(3, 4]	0.95
高速公路	100	(20, 30]	0.90	(4, 5]	0.90
一级公路、主干道	80	(30, 50]	0.70	(5, 6]	0.70
二级公路	60	(50, 100]	0.40	(6, 7]	0.40
三级公路	30	>100	0.10	>7	0.10
辅路、街道	20
小路、住宅区道路	15
其他道路	10
无道路	4

维度	指标	评价依据或方法	属性
内部交通功能A	路网密度a₁	道路长度与面积之比,赋值参考文献[3]	+
内部交通功能A	内部交通成本a₂	到市、县两级中心驻地的公路平均通行时间	-
对外交通功能B	交通干线影响度b₁	铁路、公路、机场影响度,赋值参考文献[3]	+
对外交通功能B	对外交通成本b₂	到国内省会城市、干线机场的运量加权平均时间,根据式(1)计算	-
交通系统稳定性C	路网形态稳定性c₁	平均道路连接数	+
交通系统稳定性C	沿路灾害密度c₂	沿路灾害点与道路里程之比	-
区位优势度D	中心城市邻近性d₁	与国内中心城市的道路距离,赋值参考文献[3]	+
区位优势度D	旅游资源邻近性d₂	到主要景区的道路距离,赋值参考文献[3]	+

类型	特征	C_cd值	类型	特征	C_cd值
Ⅰ	极度失调	(0, 0.1)	Ⅵ	勉强协调	[0.5, 0.6)
Ⅱ	严重失调	[0.1, 0.2)	Ⅶ	初级协调	[0.6, 0.7)
Ⅲ	中度失调	[0.2, 0.3)	Ⅷ	中级协调	[0.7, 0.8)
Ⅵ	轻度失调	[0.3, 0.4)	Ⅸ	良好协调	[0.8, 0.9)
Ⅴ	濒临失调	[0.4, 0.5)	Ⅹ	优质协调	[0.9, 1.0)

区域	CV		Moran's I
区域	2015年	2020年	2015年	2020年
全市区县	0.46	0.50	0.05	0.11
全市乡镇	0.29	0.28	0.50	0.60
巴宜区	0.09	0.08	-0.35	-0.38
波密县	0.16	0.07	-0.03	-0.13
察隅县	0.28	0.26	-0.71	-0.60
工布江达县	0.08	0.07	0.10	-0.06
朗县	0.10	0.07	-0.02	-0.07
米林县	0.06	0.08	0.37	0.44
墨脱县	0.34	0.34	-0.06	0.09

Comprehensive traffic advantage degree and its spatial characteristics at the prefecture level on the Qinghai-Tibet Plateau: A case study of Linzhi City

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