摘要
利用三峡库区多时相LUCC遥感解译数据、水系和DEM数据,考虑淹没时间的连续性和地表覆被的自然特性,构建地表覆被分类体系,对比识别水库不同运行阶段地表覆被转换的宏观时空格局,旨在找出不同覆被转换轨迹的山-谷-水界面分布与地形梯度特征。结果表明:水库不同运行阶段,1库区地表覆被间发生了不同程度的多样化转换,但总体格局不变,均以透水性的季节性绿色覆被和常绿性绿色覆被为主,占整个库区的96%以上;2库区地表覆被间的转换方向和规模呈阶段性差异,但主要地表覆被转换方式在3个运行阶段基本一致,表现为季节性与常绿性绿色覆被间互转、灰色覆被吞噬季节性绿色覆被不断扩张、水位上升淹没绿色覆被和蓝色覆被,只是其空间分布与延展呈现较大阶段性差异;3库区局部山-谷-水界面地表覆被间的转换呈显著差异,前两阶段(1997—2003年和2003—2006年)以山-山界面地表覆被转换为主,后一阶段(2006—2009年)主要是山-谷界面地表覆被间的转换,且同类地表覆被在山-谷-水界面上的转换流向也发生阶段性变化;4库区主要地表覆被转换方式的分布符合自然和人类活动的规律,在海拔和坡度2个地形梯度上具有显著差异性,但坡向仅对淹没区转换有显著影响。研究结果可为库区土地利用规划与生态环境保护提供参考。
The reservoir water level of the Three Gorges reservoir is gradually raised by means of phase water storage.The rise of water level is bound to direct the expansion of the water area,and then land cover will inevitably be overwhelmed and replaced,with the ultimate result of mountain,valley and water interface change.The research on temporal and spatial pattern of land cover conversion in the Three Gorges Reservoir Area attracts a lot of attention owing to reservoir water level fluctuation.In this study,land use/cover classification system was proposed in view of the continuity of the flooding time and differences in land cover natural features.The characteristics and trajectories of land cover conversion at the different operation phase of the Three Gorges Reservoir were analyzed based on Four-term multi-temporal land use/cover remote sensing data,the water system and DEM data.And thus,the distribution characteristics of main land cover conversion types on land,valleys and water coupling interface zones and in the condition of different terrain factors that need to be studied further also were summarized.The results showed that land cover in the Tliree Gorges Reservoir Area varied in degrees of conversion,while the overall spatial pattern remained more or less the same.It consisted mainly of seasonal green land cover and evergreen land cover,accounting for more than 96%of the whole reservoir.In addition,land cover conversion was considerably different in direction and scale throughout the operation phase of the Three Gorges Reservoir Area.More notable was that the main ways of land cover conversion at the three operation phases of the Three Gorges Reservoir were basically consistent,that were,the conversions between seasonal green land cover and evergreen land cover,the conversions of seasonal green land cover to gray land cover,and green land cover as well as blue land cover to water.However,the phased differences of spatial distribution and extension of major land cover conversion were remarkable.Furthermore,form the local point of view,there were also sharp phased differences in land cover conversion on land,valleys and water coupling interface zones.It was the conversion between land cover on land-land interface zones that was the main way at the first two phases（1997-2003 and 2003-2006）,while land cover conversion on land and valleys interface zones was the most prominent from 2006 to 2009.Moreover,the conversion directions of the same land cover types on land,valleys and water coupling interface zones had changed at different operation phase.Finally,the distribution of land cover conversion was basically in accordance with natural and human activities laws.Altitudes and slope had significant impact on land cover conversion through Three Gorges Reservoir Area,but slope aspect only had an outstanding impact on land cover conversion at flooded area.Overall,these results indicated that the spatial characteristics of local land cover conversion at three operation phase of the Three Gorges Reservoir,and they were helpful for land use planning and ecological environment protection in the reservoir area.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2016年第10期249-257,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家水体污染控制与治理科技重大专项课题(2012ZX07104-003)
关键词
土地利用
遥感
水库
地表覆被转换
山-谷-水界面
蓄水变动
运行阶段
land use
remote sensing
reservoirs
land-cover conversion
mountain
valleys and water coupling interface zones
water-level fluctuations
operation phase
