基于RS和GIS技术的汤逊湖流域城镇用地扩张动态研究

Dynamic Urban Land Expansion in Tangxun Lake Basin Based on RS and GIS Technology

摘要: 以武汉市汤逊湖流域为研究区，以空间分辨率优于为1 m的遥感影像为主要数据源，提取研究区2002、2006、2010、2015、2019年5个时期的城镇用地信息，采用扩张强度指数、扩张动态度、景观特征指数、路网密度等对城镇用地扩张进行动态分析，并据此探索城镇用地扩张的驱动因子，结果表明：汤逊湖流域近17年来城镇用地增加了77.68 km²，道路网密度由0.67增加到4.11，扩张强度指数与城镇扩张动态度分别为1.90与15.73%，属于快速扩张型，通过计算得到各时间点的城镇用地景观格局指数，结合城镇扩张指数、城镇扩张动态度以及道路网密度，分析得出2002~2015年汤逊湖流域城镇属于成长阶段，2015~2019年景观格局指数变化幅度较小，城镇逐渐走向成熟阶段。

Abstract: The Tangxun Lake basin in Wuhan was taken as the research area and remote sensing images with 1-meter spatial resolution were used as the main data source in this study. The urban land use information of the research area in 2002, 2006, 2010, 2015, and 2019 was extracted and indicators such as expansion intensity index, expansion dynamic degree, and landscape feature index and road network density were used for dynamic analysis of urban land expansion. Based on the analysis, the driving factors for urban land expansion were explored. The results showed that the urban land use has increased by 77.68 km² in Tangxun Lake basin during the past 17 years; the road network density increased from 0.67 to 4.11; the expansion intensity index and the urban expansion dynamics were 1.90 and 15.73%, respectively, which represent a rapid expansion type. The urban land landscape pattern index at each time point was calculated and the analysis revealed that the towns in Tangxun Lake basin were in the growth stage from 2002 to 2015 combining urban expansion index, urban expansion dynamics and road network density. The landscape pattern index changed less from 2015 to 2019, and the towns gradually entered the mature stage.