考虑季节性的青藏高原地区公路可达性评价

doi:10.18306/dlkxjz.2023.04.006

Abstract

Abstract:

Accessibility is one of the most important concepts in transportation geography. Accurate evaluation of accessibility is of great significance for transportation planning and development. However, there is a lack of literature on accessibility assessment that considered seasonal variation and mountainous terrain influence. The Qinghai-Tibet Plateau is characterized by distinct rainy season and snow season, as well as high altitude and complex terrain. Therefore, this study fully considered seasonal and terrain influences in the evaluation of accessibility. Combined with multi-source data, the cost-distance model was adopted in this study to evaluate the road accessibility in the Qinghai-Tibet Plateau region. The results are as follows: 1) The shortest time to basic service facilities in the Qinghai-Tibet Plateau region during the rainy season considering the influence of precipitation had little change compared with the situation without considering the influence of precipitation. In the rainy season, the average value of the total accessibility of the whole region increased by 0.011 hours, and more than 0.021% of the areas could not reach the nearest service facilities within 8 hours because of the impact of rainfall. 2) Affected by snow cover, the total accessibility of the Qinghai-Tibet Plateau region became worse, and the minimum road accessibility time in the snow season increased by 2.04 hours on average. Given the effect of snowfall, more than 5.41% of the areas could not reach the nearest service facility within 2 hours, and more than 5.54% of the areas could not reach the nearest service facility within 2-4 hours. 3) According to the seasonal change of accessibility affected by precipitation and snow cover in the rainy season and snow season, the fluctuation range of accessibility in the snow season was larger. The areas with the greatest impact on accessibility by precipitation mainly concentrated near the Mount Qomolangma and the Yarlung Zangbo River Grand Canyon, while the areas that were most seriously affected by snow cover mainly concentrated in the eastern part of Tibet Autonomous Region, the southern part of Qinghai Province, and the western part of Sichuan Province, which are mainly distributed in the Hengduan Mountainous area, Tanggula Mountains range, Bayan Har Mountains range, and other topographic areas.

Key words: road accessibility, rainy season and snow season, cost-distance model, Qinghai-Tibet Plateau region

LIU Qingfang, LU Wenqing, DAI Teqi, SONG Jinping, LIU Yufan, LI Jie. Evaluation of road accessibility in the Qinghai-Tibet Plateau regionconsidering seasonality[J].PROGRESS IN GEOGRAPHY, 2023, 42(4): 687-700.

Figures/Tables 12

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References 38

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设施类型	包含的POI类型	POI数量/个
医疗服务设施	诊所	2915
医疗服务设施	综合医院	1538
商业服务设施	购物服务：商场、超级市场、便民商店/便利店	17211
商业服务设施	金融保险服务：银行	2202
城市功能服务	县级政府驻地	161
城市功能服务	地级市政府驻地	19
交通设施服务	火车站站点	64
交通设施服务	机场	19

设施类别	可达性范围/h	占青藏全域总面积的比重/%
设施类别	可达性范围/h	未考虑降水影响	考虑降水影响	降水影响的变化
医疗服务设施	[0, 2)	21.827	21.814	-0.013
	[2, 4)	17.678	17.676	-0.002
	[4, 6)	11.821	11.822	0.001
	[6, 8)	7.763	7.762	-0.001
	≥8	40.911	40.926	0.014
商业服务设施	[0, 2)	25.887	25.875	-0.013
	[2, 4)	19.969	19.970	0.001
	[4, 6)	11.581	11.578	-0.002
	[6, 8)	6.995	6.994	-0.001
	≥8	35.568	35.584	0.015
城市功能服务设施	[0, 2)	3.912	3.911	-0.001
	[2, 4)	9.978	9.976	-0.003
	[4, 6)	12.116	12.105	-0.011
	[6, 8)	11.124	11.113	-0.011
	≥8	62.870	62.896	0.026
交通服务设施	[0, 2)	7.700	7.700	0
	[2, 4)	15.989	15.989	0
	[4, 6)	16.018	16.014	-0.003
	[6, 8)	14.851	14.833	-0.017
	≥8	45.443	45.464	0.021

可达性/h	占青藏全域总面积的比重/%
可达性/h	未考虑降水影响	考虑降水影响	降水影响的变化
[0, 2)	16.237	16.235	-0.002
[2, 4)	26.394	26.369	-0.025
[4, 6)	15.784	15.789	0.005
[6, 8)	7.997	7.998	0.001
≥8	33.589	33.609	0.021

设施类别	可达性范围/h	占青藏全域总面积的比重/%
设施类别	可达性范围/h	未考虑积雪影响	考虑积雪影响	积雪影响的变化
医疗服务设施	[0, 2)	21.83	17.40	-4.43
	[2, 4)	17.68	15.72	-1.96
	[4, 6)	11.82	11.72	-0.10
	[6, 8)	7.76	8.33	0.57
	≥8	40.91	46.83	5.92
商业服务设施	[0, 2)	25.89	20.16	-5.73
	[2, 4)	19.97	18.65	-1.32
	[4, 6)	11.58	12.37	0.79
	[6, 8)	6.99	8.00	1.00
	≥8	35.57	40.83	5.26
城市功能服务设施	[0, 2)	3.91	2.63	-1.28
	[2, 4)	9.98	6.32	-3.66
	[4, 6)	12.12	8.84	-3.28
	[6, 8)	11.12	9.35	-1.77
	≥8	62.87	72.85	9.98
交通服务设施	[0, 2)	7.70	5.68	-2.02
	[2, 4)	15.99	11.72	-4.27
	[4, 6)	16.02	11.61	-4.41
	[6, 8)	14.85	11.87	-2.98
	≥8	45.44	59.13	13.68

可达性/h	占青藏全域总面积的比重/%
可达性/h	未考虑积雪影响	考虑积雪影响	积雪影响的变化
[0, 2)	16.24	10.83	-5.41
[2, 4)	26.39	20.85	-5.54
[4, 6)	15.78	18.14	2.36
[6, 8)	7.99	10.55	2.56
≥8	33.59	39.62	6.03

Evaluation of road accessibility in the Qinghai-Tibet Plateau regionconsidering seasonality

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