近20 a来我国海岸线曲折度变化分析

曲折是海岸线的基本属性,也是影响海洋自然环境和经济发展的重要影响因素.本文借助SuperMap的线数据集重采样功能,构建了基于海岸线轮廓基线的一种新的海岸线曲折度计算方法.选取1990年、2000年、2007年和2012年4期遥感影像,提取4期海岸线基础数据,计算海岸线曲折度,根据结果分析了近20 a来的我国海岸线曲折度的变化趋势和变化特征,得出以下结论:采用构建轮廓基线计算海岸线曲折度是一种有效的方法;近20 a来,我国大陆海岸线曲折度呈波动趋势,按照变化趋势可分为上升型、下降型和波动型3种;我国海岸线曲折度空间分布差异明显,整体上北方曲折度小于南方.

Analysis on the changes of continental coastline tortuosity in China recent 20 years

Tortuous are the basic properties of the coastline, whichseriouslyaffect the natural marine environment and economic development. With the help of line dataset resampling function of the Supermap,we constructeda new calculation method of coastline tortuosity basing on Contour baseline. We extracted four basic data coastline from the year of 1990, 2000, 2007 and 2012 remote sensing images. Based on the results of coastlines tortuosity, by analysis of thetrends and variation characteristics nearly 20 years, we can obtain the following conclusions: it was an effective way to calculate coastline tortuosity by building contour baseline; continental coastline fluctuated trend, which can be divided intoascending, descending and fluctuations type; spatial distribution of Chinese continental coastline tortuosity have significant differences, on the whole northern tortuosity less than the South.