厦门市不透水面的时空演变

Spatial-temporal Change Pattern of Impervious Surface in Xiamen,China

针对关于不透水面时空演变研究还缺乏有效的定量方法的问题,以厦门市为研究区,引入不透水面变化轨迹、不透水面重心及其迁移路径,定量剖析不透水面时空演变过程。结果表明,研究时段内不透水面持续扩张,研究区21%和35.32%的面积最终分别转化为高覆盖和中覆盖不透水面类型。转化为高覆盖类型的轨迹分布在各个行政区的建成区及其周边,另外3种类型的变化轨迹以圈层结构的形式,随着时间的推进在空间上不断远离原城区。20年来厦门本岛不透水面重心稳定在湖里区与思明区的交界地带,受岛内用地条件和自然条件的限制,重心迁移距离较小,岛外4个区不透水面重心迁移距离大于厦门岛,尤其是集美区4个时段内的迁移距离均较大。

Taking Xiamen,China as the study area,this research introduced IS change trajectory and gravity center changes to investigate impervious surface(IS)spatio-temporal evolution.Conclusions can be drawn and shown as following:the IS is higher for the build-up area of six administrative areas in 1995.The high IS values extend outwards from the 1995 spatial pattern since 2000.The IS change trajectory shows the spatio-temporal change in IS during 1995-2015.The areas of medium and high percentage impervious surfaces type increase during the study period.IS change trajectories transforming into IS4(****4)cover 21% of the study area,and 35.32% of the study area have transformed into IS3(****3).Spatially,all kinds of the trajectories distribute in the form of the ring.These trajectories transforming into IS4(****4)distributes in the build-up area,outside these,it is the trajectories transforming into****3,****2 and****1.Spatially,IS gravity centers of Xiamen island migrate slightly,which is smaller than that of four administrative areas outside Xiamen island.It has the largest migration distance of IS gravity centers in Jimei district,whose mean rates of IS gravity center in different periods are 1.03 km/year(1990-1995),2.63 km/year(2000-2005),3.64 km/year(2005-2010)and 3.16 km/year(2010-2015).