摘要
依据Landsat TM影像,深圳土地利用现状图、地形图、DEM与行政区划图,通过ERDAS软件,对深圳遥感影像进行几何纠正、解译、分类。在阐释植被径流调节机理、生态效益计算原理及模型参数获取的基础上,以ArcView为平台,运用Citygreen模型的计算预测功能,对深圳市植被径流调节作用与生态效益进行评估。结果表明:自1990年至2005年以来,深圳植被(林地为主)使曲度值年均减少17.5,降低幅度为20.77%;洪峰流量年均削减219.17 m3/s,幅度在62%以上;地表径流深年均减少55.00 mm,降低幅度为29.8%;峰现时间延迟10.32 h,滞洪效应大于40%。植被径流调节生态效益年均达14.98×108美元,占2005年深圳GDP的2.08%。上述结果显示出深圳植被径流调节作用与生态效益显著。但不同年份城市植被径流调节作用与生态效益呈递减趋势且速率加快,反映出快速城市化进程对植被的强烈冲击。
Based on multi-band Landsat TM images,land-use maps,topographic maps and DEM zoning maps of Shenzhen as well as ERDAS software,we conducted geometric correction,interpretation and classification on Shenzhen remote sensing images.According to the analysis of vegetation water conservation,formation mechanism of producing runoff,and Citygreen model based on the interpretation of vegetation in flood control ecological benefits calculation principle and the model parameters with the available methods,we used ArcView as a platform to assess the ecological benefits and the influence of urban vegetation in controlling flood.The results showed that,from 1990 to 2005,the average annual curvature value was reduced by about 17.5 by Shenzhen vegetation,a reduce of 20.77%;the average annual peak flow was reduced by 219.17 m^3/s,with a decreasing range of 62% or more;the annual surface runoff was reduced by an average 55.00 mm,nearly 30%;and the peak time was delayed 10.32 h,the function of vegetation to reduce the peak flows was more than 40%.The annual average vegetation ecological benefits from reducing the peak flows was 1.498 billion dollars,accounting for 2.08% of the Shenzhen＇s GDP in 2005.The results show that the effect of Shenzhen vegetation in reducing the peak flows and ecological benefits are evident.However,both the effect of vegetation in reducing the peak flows and ecological benefits are towards a decreasing trend in different years,reflecting the intense impacts of rapid urbanization process on vegetation.
出处
《自然资源学报》
CSCD
北大核心
2009年第7期1223-1233,共11页
Journal of Natural Resources
基金
国家自然科学基金重点项目(40830748)
国家自然科学基金项目(40571051)
关键词
Citygreen模型
遥感影像
城市植被
径流调节
生态效益
深圳市
Citygreen model
urban vegetation
remote sensing image
runoff regulation
mechanism ecological benefits
Shenzhen
