昆明市近30年水域面积的时空变化特征分析

Temporal and Spatial Variation of Water Area in Kunming City in Recent 30 Years

水域面积是反映水资源状况和水环境变化的重要指标,其变化对生态系统功能、水文循环和气候变化等方面有重大影响。利用PIE-Engine遥感计算云服务平台,基于Landsat TM/ETM+遥感影像,采用NDWI(Normalized Difference Water Index)指数,分析了昆明市水域面积的长时序变化特征和成因,结果表明:昆明市的水域面积近30年来整体上呈现先减少后增加再减少后增加的动态变化趋势;这种变化主要受自然因素和人为因素的共同影响,其中自然因素主要包括气候变化,人为因素主要包括城市扩张、城市水资源的开发与利用、土地利用、水利工程建设和环境污染等。

Water area is an important index to reflect the status of water resources and the change of water environment,and its change has a significant impact on ecosystem function,hydrological cycle and climate change.Based on PIE-engine remote sensing computing cloud service platform,Landsat TM/ETM and remote sensing images,NDWI(Normalized Difference Water Index)was used to analyze the long-term change characteristics and causes of water area in Kunming.The results show that in the past 30 years,the water area of Kunming City shows a dynamic trend of decreasing,increasing,decreasing and increasing.The change is mainly affected by natural factors and human factors.The natural factors mainly include climate changes,and the human factors mainly include urban expansion,urban water resources development and utilization,land use changes,water conservancy project construction and environmental pollution.