琼东北海湾海滩地形年度变化特征对比分析

Annual Changes Characteristics of Beach Topography in the Northeastern Bays of Hainan Proince

利用2016—2017年琼东北海湾海滩断面高程数据,对比分析了琼东北海湾-海口湾、铺前湾和木兰湾年度地形变化特征。结果表明,海口湾、铺前湾和木兰湾海滩断面地形均具有季节性变化特征,整体上夏缓冬陡,表现为前滨遭受侵蚀作用,而后滨则发生堆积作用。冬季,琼州海峡的海平面较高且风浪作用更强,这是导致冬季的海滩地形变化幅度较夏季更为明显的原因之一。同时,岸外人工岛的建设、河流输沙量的急剧减少和人类活动等,也是海滩地形变化的重要影响因素。研究结果可为琼东北海湾岸线资源开发利用与地质环境保护提供一定的科学依据。

The annual changes of the beach topography in the northeastern bays of Hainan Proince which include the Haikou Bay,the Puqian Bay and the Mulan Bay are compared and analyzed based on the data of beach section elevation monitored from 2016 to 2017.The results show that the topography of beach section of the three bays is all characterized with seasonal change.As a whole,the topography of the beach sections is gentle in summer and steep in winter and shows erosion at the foreshore and accumulation at the backshore.In the Qiongzhou Straits,the sea level is higher and the wind wave is stronger in winter.This might be one of the reasons that cause the variation amplitude of the beach topography more significant in winter than in summer.In addition,the construction of offshore artificial islands,the sharp reduction of river sediment load and the human activities are also the important factors influencing the changes of beach topohraphy.The research results can provide basis for the development and utilization of coastal resources and the protection of geological environment in the northeastern bays of Hainan Proince.