摘要
可达性是交通地理学的重要概念之一,准确评价可达性对于交通规划和建设具有重要意义,但目前考虑季节性变化和山区地形影响的可达性评价仍相对较少。青藏高原地区不仅雨季、雪季分明,且具备高海拔和地形复杂等特征,因此,需要在可达性评价中充分考虑季节影响和地形影响。结合多源数据,论文采用成本—距离法评价青藏高原地区公路可达性。结果表明:(1)雨季青藏高原地区到基础服务设施的最短时间较于未考虑降水影响的情况变化不大,在雨季全域总可达性平均值增加0.011 h,多出0.021%的地区受降水影响无法在8 h范围内到达最近服务设施。(2)受积雪影响,青藏高原全域可达性存在变差的情况,全域雪季最短可达性时间平均增加2.04 h。多出5.41%的地区受降雪影响无法在2 h内到达最近服务设施,多出5.54%的地区无法在[2, 4) h范围内到达最近服务设施。(3)从雨雪季节受降水和积雪影响的可达性季节波动情况来看,雪季可达性波动幅度更大。其中,可达性受降水影响最大的地区主要聚集在珠穆朗玛峰附近以及雅鲁藏布江大峡谷附近地区;可达性受积雪影响最严重的地区主要聚集在西藏自治区的东部、青海省的南部、四川省的西部,多分布在横断山区、唐古拉山脉、巴颜喀拉山脉等地形区内。研究结果可为青藏高原地区提高交通路网的稳定性与优化交通路网布局提供科学参考。
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.
作者
刘庆芳
卢文清
戴特奇
宋金平
刘宇藩
李洁
LIU Qingfang;LU Wenqing;DAI Teqi;SONG Jinping;LIU Yufan;LI Jie(Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China;China International Engineering Consulting Corporation,Beijing 100048,China)
出处
《地理科学进展》
CSSCI
CSCD
北大核心
2023年第4期687-700,共14页
Progress in Geography
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0406)。
关键词
公路可达性
雨雪季节
成本—距离模型
青藏高原地区
road accessibility
rainy season and snow season
cost-distance model
Qinghai-Tibet Plateau region
作者简介
第一作者:刘庆芳(1994-),女,安徽天长人,博士生,主要从事城市与区域可持续发展研究。E-mail:202131051024@mail.bnu.edu.cn;通信作者:戴特奇(1980-),男,重庆人,博士,副教授,主要研究方向为交通地理、城市与区域发展。E-mail:daiteqi@bnu.edu.cn。
