近25年来我国海岸线开发强度变化研究

海岸线资源作为社会经济发展与城市扩张的重要空间基础，成为沿海城市社会经济发展的最重要因素。本文基于1990年、2000年、2010年和2015年4个时期的遥感影像提取岸线数据，计算25年来我国大陆海岸线开发强度变化量及年均变化速度，研究其时空演变规律，得出以下结论:（1）我国海岸线开发强度变化速度保持增长趋势，空间分布上以长江入海口为分界线，北方沿海城市普遍高于南方，时空演变形态呈现"三期"和"两型"两种特征；（2）重度开发岸线多分布于山东、辽宁和浙江三省，而天津、江苏和上海范围内其所占本省已开发利用岸线总长度的比例较大，均大于70%；（3）近25年来，我国大陆海岸线开发强度指数，以上海市为分界线，北方沿海城市指数全部高于0.6，均高于南方。

Analysis on the changes of coastline development intensity in China recent 25years

Coastline resources are the important spatial basis of socio-economic development and urban expansion, which have become the key factor in the socio-economic development of coastal cities.Based on remote sensing images extracted from 1990, 2000, 2010 and 2015, this paper calculates the change of the development intensity and the average annual variation rate of the coastline was calculated to study its spatial and temporal evolution characteristics in the past 25 years, and studies the temporal and spatial evolution laws of time and temporal evolution of the mainland coastline.The conclusions were followed:(1)China's coastline development intensity growth rate to maintain the growth trend, the spatial distribution of the Yangtze River estuary as the dividing line, the northern coastal cities generally higher than the south, the evolution of time and space showed the "three" and "two".(2)During the research period, the highly utilization coastline was mostly distributed in Shandong, Liaoning and Zhejiang provinces.The percentage of utilization in total length of developed coastline was larger over 70% in Tianjin, Jiangsu and Shanghai.(3)In the recent 25 years, the trend of the continental coastline development intensity index to Shanghai as the dividing line, The northern coastal cities was over 0.6, which was generally higher than the southern coastal cities.