基于水边线方法的辽河口鸳鸯岛形成与演变模拟

发布时间：2018-05-10 09:52

本文选题：水边线方法 + 潮位校正　；参考：《海洋科学进展》2017年04期

【摘要】：针对河口泥沙岛淤泥质潮滩坡度和潮汐变化对水边线的影响,提出一种利用两期遥感水边线模拟海岛岸线及潮滩数字高程模型(Digtal Elevation Model,DEM)的方法,研究辽河口鸳鸯岛的形成与演变过程。结合遥感影像、实测地形和潮位数据分析表明:1)模拟潮滩DEM与实测DEM之间的误差集中在—40~55cm的范围内,平均误差14.24cm,表明遥感模拟作为一种手段对实测资料的欠缺是一种有效的补充。2)从20世纪80年代初至今,鸳鸯岛的发育经历了萌生、生长和动态稳定三个时期;入海径流量的增加是鸳鸯岛萌生的诱因,涨落潮流路分歧及其形成的缓流区促进鸳鸯岛的持续生长。3)在鸳鸯岛生长过程中,南沙处在次生缓流区中,在相同时段内其潮滩淤积量大于北沙;在鸳鸯岛演变稳定期,就岸线和面积变化而言,东北部潮滩侵蚀程度小于南部潮滩淤积程度,但从体积变化来看,东北部潮滩侵蚀量略大于南部潮滩淤积量。
[Abstract]:In view of the influence of muddy tidal flat slope and tidal variation on the water boundary line in estuarine and sediment island, a method of simulating island shoreline and tidal beach digital elevation model by using two-stage remote sensing water boundary line is proposed. The formation and evolution of mandarin duck island in Liaohe Estuary are studied. Combined with remote sensing image, the analysis of topographic and tidal level data shows that the error between simulated tidal flat DEM and measured DEM is concentrated in the range of -405cm. The average error is 14.24 cm, which indicates that remote sensing simulation is an effective supplement to the measured data as a means.) since the beginning of 1980s, the development of Mandarin duck island has experienced three periods: initiation, growth and dynamic stability. The increase of runoff into the sea is the inducement of the initiation of Yuanyang Island. The divergence of the fluctuating tidal current and the slow flow area promoted the sustained growth of Yuanyang Island. 3) during the growth process of Yuanyang Island, Nansha is in the secondary slow flow area. In the same period of time, the amount of tidal flat deposition is larger than that of northern sand, and in the stable period of Yuanyang Island evolution, the erosion degree of the northeast tidal flat is smaller than that of the southern tidal flat in terms of shoreline and area change, but from the perspective of volume change, The erosion amount of the northeast tidal flat is a little larger than that of the southern tidal flat.
【作者单位】：华东师范大学河口海岸学国家重点实验室;国家海洋环境监测中心;
【基金】：海洋公益性行业科研专项——典型海岛生态脆弱性评估及综合调控技术研究与示范(201505012)
【分类号】：P343.5;P731.2

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