EVOLUTION CHARACTERISTICS OF WEIFANG ARTIFICIAL BEACH AND THE EOF ANALYSIS ON PROFILE CHANGE
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摘要: 对潍坊人工沙滩二期工程竣工后海滩实测地形剖面进行研究,应用经验正交函数(EOF)提取海滩2013年5月至2015年11月6次剖面监测数据中的前3个模态的空间特征函数和时间特征函数,分析竣工养护后海滩剖面的时空演变特征及海滩的平面变化特征。第一特征函数表示竣工后海滩的总体冲淤变化,受到东西两侧丁坝加长和中间T型坝修建的影响,剖面的侵蚀程度较一期工程明显减小;第二特征函数表示受地形和水动力作用影响,前滨带出现滩肩剖面和沙坝剖面的相互转化;第三特征函数反映风暴潮、人为因素等偶然因素的影响;从平面特征来看,人工沙滩中部、东部较西部侵蚀严重。可见,二期工程建设起到了优化的目的,大大改善了人工沙滩的侵蚀,但仍需要持续有规律的对海滩进行监测,进一步深化对人工养护沙滩建设和维护的认识。Abstract: We made a study of the measured beach profiles in the Weifang artificial beach after the second stage of the nourishment project.Empirical Orthogonal Function(EOF) is applied to analyze the spatial and temporal features of the beach profiles and the evolutionary features of the beach from May 2013 to November 2015.The results indicate that the beach profile evolution includes 3 phases.The first phase represents the overall change of the beach,and the erosion is significantly decreased compared with the first-stage project after the establishment of the groins on both east and west sides and a new T-type groin in the middle of the beach;The second phase represents the inter-conversion between the beach ridge and the beach bar in the foreshore area affected by topography and hydrodynamic interaction;the third phase represents the accidental disturbance of storm surges and human factor.The plane view of the beach shows that erosion is more serious in the central and eastern parts than in the west part of the artificial beach.The purpose of beach optimization is achieved after the second-stage of the project.It is necessary to monitor the beach regularly to understand more for future construction and maintenance of the artificial beach.
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