南漪湖保护区不透水表面时空格局分析

Temporal and Spatial Pattern Analysis of Impervious Surface in Nanyi Lake Reserve

不透水表面是城市化、大气污染、区域环境变化等研究的重要内容。本文在城市化背景下,定量分析南漪湖保护区内不透水表面时空变化特征,利用2000-2019年南漪湖保护区Landsat5、Landsat8五期遥感影像,借助监督分类中最大似然法提取南漪湖保护区内不透水表面。结果表明:2000-2019年,由于城市化快速发展,南漪湖保护区内水体覆盖面积呈下降状态,植被覆盖率呈波动下降状态,而不透水表面面积从123.3 km^2上升至635 km^2,上升趋势由快变慢,但仍有加快的趋势。在不透水表面面积快速上升的同时,南漪湖水质不断下降,二者具有一定的负相关性。

Impervious surface is a vital part of studies on urbanizations,air pollutions and regional environmental changes.This paper adopted a quantitative approach to analyze the spatial and temporal characteristics of the impervious surface in Nanyi Lake Reserve under the background of urbanization,and extracted the impervious surface information of Nanyi Lake Reserve by using the Landsat 5 and Landsat 8 five phases remote sensing images from 2000 to 2019,with the help of the maximum likelihood classification in the supervision classification.The results show that from 2000 to 2019,due to the rapid development of urbanization,the water coverage area in Nanyi Lake protection area decreased,the vegetation coverage rate fluctuated and decreased,while the impervious surface area increased from 123.3 km^2 to 635 km^2,the rising trend changed from fast to slow,but there was still an increasing trend.At the same time,the water quality of Nanyi Lake is decreasing,which has a negative correlation.