珠江口沿岸土地利用变化及其地表热环境遥感分析

Analysis of land use change and thermal environment in Pearl River Estuary based on remote sensing technology

以遥感和GIS为技术手段,选择四期TM/ETM+影像为数据源,对珠江口沿岸区域的土地利用及其地表热环境的变化进行了定量分析。1990—2008年期间,建设用地扩展是珠江口区域土地利用变化最为显著的特征,建设用地从1990年的605.50km2增加到2008年的2394.26km2。土地利用变化导致区域热环境效应增强,并促使不同土地利用类型在7个热力区间中的组成发生变化。珠江口东岸建设用地在数量上的优势使得珠江口的热力重心始终分布在东岸。研究结果表明,以建设用地扩展为突出特征的土地利用变化,深刻影响着区域热环境。

Based on remote sensing and GIS technology,the study analyzed the land use change and the thermal environment using four sets of TM/ETM＋ image of 1990,1995,2000 and 2008.The result was that the expansion of built-up area was the most obvious character of land use change during 1990-2008.The built-up area increased from 605.50 km^2 in 1990 to 2 394.26 km^2 in 2008.The land use change induced the thermal intensity increased and caused the proportion of different land use types changed a lot.The high quantity of built-up area distributing in the east part of Pearl River Estuary ensured the thermal centroids for different periods located there.This study indicated the land use change especially the built-up area expansion influenced the regional thermal environment dramatically.