高速公路引导下的长江经济带路网评价研究

Evaluation of the Yangtze River Economic Belt Road Network Guided by Expressways

以长江经济带为研究区域,采用栅格与网络技术相结合的空间分析方法,在运用通达性、可达性等指标对长江经济带交通改善状况比较分析的基础上,对交通发展变化热点空间特征进行识别和探讨。结果表明:长江经济带不同区域的通达性与可达性均获得明显提升,但上下游仍存在较大差距;区域通达性与可达性除呈现从下游向上游逐层递减的扇形层次空间格局外,还呈现以中心省会城市向四周递减的圈层空间结构;交通干线沿线的通达性和可达性较优,平原通达性和可达性明显优于盆地、山地;在高速公路引导下,交通变化下的新交通核心城市涌现,云南、四川出现双核发展模式;交通发展热点主要分布在成渝城市群,冷点主要分布在长三角城市群;高速公路的建设有利于推动地区通达性和可达性的提高。

The Yangtze River Economic Belt(YREB)is taken as the research area,by means of combining the spatial analysis method and grid and network technology,on the basis of comparing and analyzing the traffic improvement status of the YREB in terms of connectivity and accessibility and other indicators,the spatial characteristics of the hot spots of traffic development changes are identified and explored.The results show that the accessibility and connectivity of different regions in the YREB have been significantly improved,but there is still a large gap between the upstream and downstream;the regional accessibility and connectivity have shown a fan-shaped hierarchical spatial pattern that gradually decreases from downstream to upstream.In addition,it also presents a spatial structure of the circle gradually decreasing from the central provincial capital city;the accessibility and connectivity along the main traffic lines are better,and the accessibility and connectivity of the plains are significantly better than those of basins and mountains;under the guidance of highways,new transportation core cities have emerged under traffic changes,and dual-core development mode have emerged in Yunnan and Sichuan provinces;transportation development hotspots are mainly distributed in the Chengdu and Chongqing urban agglomeration,and cold spots are mainly distributed in the Yangtze River Delta urban agglomeration;and the construction of expressways is conducive to promoting the accessibility and connectivity of regional transportation.