刘凯,王晓利,侯西勇,李东

• 1:中国科学院烟台海岸带研究所/山东省海岸带环境过程重点实验室
• 2:中国科学院大学

摘要(Abstract)：

【目的】利用遥感技术提取黄河三角洲低潮线，分析其40 a时空变化规律及驱动机制，为海岸带资源管理与生态保护提供依据。【方法】基于Google Earth Engine云平台，利用1984―2024年Landsat系列卫星影像，计算时间序列的植被和水体指数，结合实地调查数据，确定黄河三角洲潮汐淹没频率算法，构建低潮线提取模型，运用数字岸线分析系统（DSAS）分析低潮线时空变化特征，并探讨其与黄河径流量、输沙量的关系。【结果与结论】黄河三角洲低潮线长度总体呈增长趋势，年均增长约1.21 km；低潮线的动态变化特征指示研究区以侵蚀作用为主导，低潮线线性回归变化速率平均为-15.35 m/a，且较强侵蚀等级占比最高，达47.88%；低潮滩的侵蚀与淤积过程均呈减弱趋势，其变化速率分别为0.50和0.10 km~2/a；河口岸段低潮线长度增量、低潮滩净变化面积与径流量增量、输沙量增量之间均呈正相关关系，在清8汊流路的相关性更为显著。构建的适用于黄河三角洲低潮线提取模型可系统揭示低潮线时空变化规律以及水沙变化对河口岸段地貌演变的重要影响。

关键词(KeyWords)： 低潮线;黄河三角洲;潮汐淹没频率;时空变化;遥感

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（42176221,41901133）;; 中国科学院烟台海岸带研究所前沿部署项目（YIC-E3518907）

作者(Author): 刘凯,王晓利,侯西勇,李东

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