粤东大亚湾水沙环境及岸滩演变分析  

Current and sediment environment and coastal evolution in Daya Bay,eastern Guangdong

作　　者：谢华亮[1] 赵张益 王恒 XIE Hualiang;ZHAO Zhangyi;WANG Heng(Key Laboratory of Engineering Sediment of Ministry of Communications,National Engineering Research Center of Port Hydraulic Construction Technology,Tianjin Research Institute for Water Transport Engineering,MOT,Tianjin 300456,China)

机构地区：[1]交通运输部天津水运工程科学研究所,港口水工建筑技术国家工程研究中心,工程泥沙交通行业重点实验室,天津300456

出　　处：《水运工程》2024年第5期1-7,共7页Port & Waterway Engineering

摘　　要：根据现场实测水文泥沙及地形资料,对大亚湾海域的自然条件、水沙环境特征及岸滩演变特征进行分析,研究结果表明:大亚湾潮差较小,波浪和潮流动力弱,水体含沙量较低,泥沙来源有限,主要来自近岸附近滩面就地搬运的少量泥沙。湾内底质多为黏土质粉砂,呈现淤积质海岸的沉积特点。因此大亚湾海域水清沙少,自然状态下海床长期保持稳定。近期受港口航道建设、围填海等人类活动的影响,部分海床地形出现较大幅度的冲淤变化。湾内港池、航道疏浚开挖后航槽稳定,回淤强度较小。正确认识该海域的水动力条件、泥沙运移及海床冲淤变化,不仅是开展海岸工程开发建设的关键技术问题,也有利于近岸海洋环境保护及资源开发利用。Based on on-site hydrological,sediment,and topographic data,we analyze the natural conditions,current and sediment environment characteristics,and coastal evolution characteristics of the Daya Bay.The research results show that Daya Bay has a small tidal range,weak wave and current forces.The water body has a relatively low suspended sediment concentration(SSC).The sediment source is limited and the small amount of sediment transported on the beach near the shore is the primary source of sediment in Daya Bay.The surface sediments are primarily composed of clayey silt,which is typical of muddy coastal areas.Due to the clean water and low SSC,weak wave and current dynamics result in the seabed remaining stable for a long time.The recent significant changes in erosion and deposition on the seabed are mainly affected by human activities such as port and waterway construction and land reclamation.Studies indicate that after dredging and excavating the harbor and waterway,the navigation channel remains stable,and siltation intensity is relatively small.A correct understanding of current and sediment environment and beach evolution in the sea area is not only a key technical issue for coastal engineering development and construction,but also beneficial for the protection of nearshore marine environment and resource development and utilization.

关 键 词：水沙环境 泥沙来源 岸滩演变 大亚湾 

分 类 号：P737[天文地球—海洋地质] U65[天文地球—海洋科学]