河北昌黎典型海岸沙丘的沉积构造及其发育模式

发布时间：2018-02-16 02:21

本文关键词： 探地雷达 GPR 横向沙脊新月形沙丘链沉积构造沉积序列发育模式河北昌黎　出处：《海洋学报》2016年07期 　论文类型：期刊论文

【摘要】：采用探地雷达探测了昌黎海岸沙丘区典型横向沙脊和新月形沙丘的沉积构造,据此初步揭示了研究区海岸沙丘的沉积序列特征和发育过程。结果表明,昌黎海岸带在2 000aBP波浪作用下发育滨岸沙坝,沙坝主要以向海向陆缓倾斜的沉积构造为主,现今的风成沉积发育于滨海相沙坝之上。海岸带向海一侧经历了潮上带前丘到横向沙脊的过程,横向沙脊在东北风的作用下主要发育向陆倾斜的高角度交错层理,同时由于向岸合成风力的阶段性变化,这些层理的倾角略有差异,记录了海岸带风沙活动的周期性变化;内侧新月形沙丘由4组倾角不同的层理组成,被较大规模的二级界面分隔,复合新月形沙丘(链)经历了由盾状沙堆到典型新月形沙丘的加积发育并遭受风蚀的过程。
[Abstract]:The sedimentary structures of typical transverse ridge and crescent dune in the coastal dune area of Changli have been detected by using ground penetrating radar, and the sedimentary sequence characteristics and development process of the coastal dune in the study area have been preliminarily revealed. The coastal zone of Changli developed a shoreline sand dam under the action of 2 000 a BP wave. The main structure of the sand dam was the sedimentary structure of gently tilting toward the sea to the land. The present aeolian deposits are developed on the coastal sand dams. The coastal zone seaward side experienced the process from the front dome to the transverse sand ridge in the upper tidal zone, and the transverse sand ridge mainly developed a high-angle interlaced stratification inclined to the land under the action of the northeast wind. At the same time, due to the periodic changes of the synthetic wind force along the shore, the dip angles of these layers are slightly different, which records the periodic changes of the wind-sand activity in the coastal zone, and the medial crescent dune is composed of four sets of bedding with different dip angles. Separated by the larger secondary interface, the complex crescent dune (chain) experienced the process of accumulation and wind erosion from the shield sand heap to the typical crescent sand dune.
【作者单位】：福建师范大学地理科学学院;湿润亚热带生态地理过程教育部重点实验室;福建师范大学地理研究所;
【基金】：国家自然科学基金(41271031,41301012) 国家自然科学基金委员会——福建省人民政府促进海峡两岸科技合作联合基金(U1405231) 福建省科技厅公益类科研院所专项基金(2013R09) 福建省自然科学基金(2014J01151)
【分类号】：P737.1

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