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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Super Map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。
Winding twists and turns are the basic attributes of the coastline and are also important influencing factors for the marine natural environment and economic development. In this paper, a new method for calculating the coastline tortuosity based on the baseline of the coastline is constructed by using Super Map’s line data set resampling function. Based on the remote sensing images of 1990, 2000, 2007 and 2012, the basic data of four coastlines were extracted and the coastline tortuosity was calculated. Based on the results, the trend and change characteristics of coastline tortuosity in China in the past 20 years were analyzed. The following conclusions are drawn: It is an effective method to calculate the coastline tortuosity by using the baselines of the constructed contours. In the recent 20 years, the twists and turns of the coastline of China show a trend of fluctuation, which can be divided into three types: ascending, descending and fluctuating. The distribution of tortuous degree of coastline in our country is obviously different. As a whole, the tortuous degree in the north is smaller than that in the south.