青岛汇泉湾海滩地貌与沉积物变化特征探讨  

Beach Morphology and Sediment Change Characteristics of Huiquan Bay in Qingdao

作　　者：王潇潇[1,2] 周旻玥[1,2] 韦龙明[1,2] 王然[1,2] 陈雪峰[1,2] 孙积悦[1,2] 孙明行[1,2] 肖方源 蒋杨权[1,2] 

机构地区：[1]桂林理工大学广西矿冶与环境科学实验中心,广西桂林541004 [2]桂林理工大学地球科学学院,广西桂林541004 [3]广西地质矿产勘查开发局二七一地质队,广西桂林541199

出　　处：《桂林理工大学学报》2013年第2期266-272,共7页Journal of Guilin University of Technology

基　　金：2012年度广西大学生创新项目(2012DXCX004);第十三届"挑战杯"全国大学生课外学术科技作品竞赛校级重点项目;2011;2012年桂林理工大学大学生课外科技作品立项项目

摘　　要：2010和2011年两次对青岛汇泉湾海滩表层沉积物进行观察、取样,按照泰勒标准筛制对样品进行筛分与统计并作图分析,探讨了2种环境下的沉积物分布规律:在正常潮汐流作用下,在高潮线附近发育一个纵向沙堤,从岬角由近到远,沙堤的宽度与高度由大变小并逐步消失,沉积物粒度由粗变细;经过风暴流的改造作用后,原有沙堤被破坏消失,出现横向沙脊韵律地形,从岬角由近到远,沙脊规模先由小到大,然后再逐步变小。在横向上由岸到海,两种环境下形成的海滩表层沉积物均出现细→粗→细→粗→细的复杂变化。通过滨海潮间带海洋地质作用的影响因素综合分析,沙堤的纵向变化规律是在岬角地形背景条件下,不仅受沿岸流的控制,也受岬角物质供给的控制,具有双重控制特点;而在强大风暴流的改造下,海滩形貌被改造,原有沉积物经过搬运、再沉积,形成条形横向沙脊韵律地形;潮间带海滩表层沉积物粒度的复杂变化,特别是存在一个砂砾混合带,是潮汐进流与退流相互作用的结果。The beach surface sediments of Huiquan Bay were sampled and observed in 2010 and 2011.Sediments samples were screened by Taylor standard screen and the particle size analysis was carried out to investigate their distribution in two environments.It is found that：（1） under the normal tidal flow,a longitudinal sand dune was developed near the high tide line.From near the cape to long distance,the width and height of the dunes decreased and gradually disappeared,and the grain size of sediments from coarse to fine.（2） After the transformation of storm flow,the original sand dunes were destroyed,and the topography of lateral sand ridge with rhythm formed.From the cape to long distance,the sand ridge scale increased,but gradually became small.（3） In the transverse direction,from shore to sea,the sediments particle size showed complex changes（fine→coarse→fine→coarse）.Based on the above factors affecting marine geological process,it is proposed that the variation regularity of longitudinal dune in particle size,and in cape topography was decided not only by the coastal current,but also by material supply,with the dual control characteristics.As powerful storm tide transformed the beach morphology,the original sediments presented strip-transverse sand ridge topography with rhythm by transportation and deposition.Along the intertidal beach zone,tidal flow and back flow interaction brought about the complex changes of surface sediments in particle size,especially the existence of sand-gravel mixed zone.

关 键 词：海滩 表层沉积物 沙堤 沙脊 潮汐流 风暴流 汇泉湾 青岛 

分 类 号：P736.213[天文地球—海洋地质]