山东半岛砂质海滩动力地貌演化特征

发布时间：2018-03-29 09:15

本文选题：山东半岛　切入点：海滩剖面监测　出处：《海洋科学》2017年04期

【摘要】：为探讨山东半岛砂质海滩的动力地貌学特征,利用波浪和潮汐资料计算了山东半岛浪潮作用指数K和波浪-沉积物参数(Dean参数(Ω)),并进行了地貌类型划分;结合2012~2015年对山东半岛不同地理岸段砂质海岸地形地貌、表层沉积物进行的7次监测,对海滩监测剖面地形高程和表层沉积物粒度监测数据进行了研究,结果表明:山东半岛北部烟台多处海滩为消散型,局部过渡性;威海东侧和山东半岛南部海滩属于过渡型或反射型;不同类型沙滩季节变化差别明显,消散型海滩夏季容易形成沿岸沙坝,冬季海滩沙坝明显受到侵蚀;而过渡型或反射型海滩变化趋势相反,冬季靠近高潮线的部位淤积,形成滩肩,夏季受到侵蚀消失。山东半岛北部海滩粒径较粗,并呈现逐年变粗的趋势,而山东半岛南部粒径较细且逐年变细;季节变化受到波浪条件和季节差异的控制,招远、龙口、威海、日照地区较牟平、海阳、青岛等平直岸段冬季沉积物比夏季粗。山东半岛砂质海滩的地貌形态受海岸的地理位置、海洋动力条件、岸线走向及沙源供给等多种沉积环境因素的影响,人类活动的影响可在短期内对海滩造成剧烈变化,引起海岸严重侵蚀。
[Abstract]:In order to study the dynamic geomorphological characteristics of sandy beaches in Shandong Peninsula, the wave action index K and the wave-sediment parameter (惟) are calculated by using the wave and tide data, and the geomorphologic types are classified. Combined with 7 times monitoring of sandy coast topography and surface sediments in different coastal sections of Shandong Peninsula from 2012 to 2015, the topographic elevation and surface sediment granularity monitoring data of beach monitoring profile were studied. The results show that many beaches in Yantai, north of Shandong Peninsula, are dissipated and partially transitional, the beaches on the east side of Weihai and the south of Shandong Peninsula belong to transitional or reflective type, and the seasonal variation of different types of beaches is obvious. The beach of dissipative type is easy to form coastal sand dam in summer and obviously eroded in winter, but the transitional or reflective beach tends to change in opposite direction, and the part near the high tide line silts in winter, forming the beach shoulder. The beach diameter in the north of Shandong Peninsula is coarse, and it tends to be coarser year by year, while in the south of Shandong Peninsula, the diameter of the beach is smaller and thinner year by year, the seasonal variation is controlled by the wave condition and the seasonal difference, Zhaoyuan, Longkou, Zhaoyuan, Longkou, etc. The winter sediments in Weihai, Rizhao area, Haiyang and Qingdao are thicker in winter than in summer. The geomorphology of sandy beaches in Shandong Peninsula is affected by the geographical location of the coast and the marine dynamic conditions. Due to the influence of various sedimentary environmental factors such as shoreline strike and sand source supply, the influence of human activities can cause drastic changes to the beach in a short period of time and cause serious erosion of the coast.
【作者单位】：国土资源部油气资源和环境地质重点实验室青岛海洋地质研究所;青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室;中国地质调查局滨海湿地生物地质重点实验室青岛海洋地质研究所;
【基金】：国家自然科学基金(41106060,41406080) 海洋地质保障工程(DD20160144,GZH201200505)~~
【分类号】：P737

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