山东半岛东部南北岸典型砂质海岸沉积、地貌的横向差异及成因分析———以海阳万米海滩岸段和威海国际海水浴场岸段为例

根据2011年在海阳万米海滩岸段与威海国际海水浴场岸段调查获得的夏、冬两季海岸实测地形剖面与沉积物粒度数据,并收集相关水文资料,对南北两海岸地貌与沉积差异性进行分析,探讨了半岛东部南北岸典型砂质海岸动力环境的差异。研究结果表明,南部海岸宽广平缓,发育滩脊、滩肩、沙波纹等地貌,沉积物在水下岸坡上段以中粗砂、中细砂为主,水下岸坡以下段以粉砂、黏土质粉砂为主;北部海岸地形陡,发育滩肩陡坎、水下沙坝等地貌,沉积物以砾质砂为主。导致这些差异的动力为风、波浪、潮汐及沿岸流堆积。

Lateral Differences in Sediments and Geomorphology of the Northern and Southern Typical Sandy Coasts in the Eastern Shandong Peninsula and Their Genesis---Taking the Coasts of the Haiyang Wanmi Beach and the Weihai International Beach as the Example

Based on the topographic profiles and sediment grain size measured along the coasts of the Haiyang Wanmi Beach and the Weihai International Beach in summer and winter of 2011 and the collected hydrological data as well,the differences in geomor-phology and sediments of the northern and southern coasts in the eastern Shandong Pen-insula are analyzed and the differences in dynamic conditions along the two typical sandy coasts are discussed.The results show that the southern coast is broad and gentle and developed with beach ridges,beach berms and sand ripples.The sediments there are dominated with medium-coarse and medium-fine sands in the upper part of the under-water shore slope,and with silt and clayey silt in the lower part.The northern coast is steeper and developed with berm scarps and underwater bars,and the sediments are dominated with gravelly sand.All these differences are mainly attributed to wind, wave,tide and coastal current.