1990-2019年艾丁湖流域城市空间扩展遥感监测

Remote Sensing Monitoring of Urban Expansion in Ecologically Fragile Areas in Aydingkol Lake Basin from 1990 to 2019

基于卫星遥感影像,监测艾丁湖流域1990-2019年土地覆盖类型变化,并利用多种城市变化监测指数及雷达图方法,揭示以自然流域为研究范围的城市扩展变化过程,并探究其驱动机制。结果表明:(1)1990-2019年,流域内土地类型变化巨大,城市扩展明显,建成区面积扩大了近3倍;(2)流域内城市扩展经历了中速扩张和高速扩张两个阶段;(3)流域内3个主要城市建成区面积分别扩展了约40 km^(2)、60 km^(2)、40 km^(2),3个城市均在原基础上整体向外扩展,在2000年后托克逊县向西南方向扩展明显,吐鲁番市向西北和东方向扩展更为明显,鄯善县除原西南和东北方向外还增加了西北的扩展方向。自然条件是制约西部干旱地区城市发展的主要因素,同时西部地区的城市扩展受经济和政策因素的影响逐渐增强。

Based on remote sensing images,we monitor the land type changes in the Aydingkol Lake Basin from 1990 to 2019,and use kinds of indexes and radar chart methods to reveal the urban expansion process and explore its driving mechanism.The results show that:(1)From 1990 to 2019,the land types in the basin changed greatly,and the urban expansion was obvious.(2)Urban expansion has experienced a medium-speed expansion stage and a high-speed expansion stage.(3)The built-up areas of the three main cities in the basin have expanded by about 40 km^(2),60 km^(2),and 40 km^(2) respectively.The three cities have expanded outwards as a whole on the original basis.Natural conditions are the main factor affecting urban development in the arid areas of the west,and urban expansion is gradually being affected by economic and policy factors.