海岸人工地貌建设是沿海国家开发利用海岸带资源的重要方式,海岸人工岸线的形成改变了自然岸线的格局,并影响着岸线的自然演替规律。基于1990,2000和2010年3期TM遥感影像,提取不同时相的浙江省大陆海岸线信息,对浙江大陆海岸线类型构成及人工岸线建设对岸线格局的影响进行了分析。结果表明:(1)受人类开发活动的影响,近20 a来浙江大陆海岸格局以人工岸线不断增长为特征;(2)不同岸段的人工岸线增长速度有明显差异,以杭州湾、三门湾及台州湾沿岸岸线变化最为显著;(3)20 a间,浙江大陆岸线整体向海推进趋势明显,仅少数岸线发生了海岸蚀退;(4)人工岸线的建设通过对自然岸线的截弯取直,缩短了自然岸线的长度,降低了自然岸线的曲折度,却使浙江省大陆海岸线的多样性指数不断增加。
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