Influence of near-shore marine structures in a beach nourishment project on tidal currents in Haitan Bay, facing the Taiwan Strait  

作　　者：顾杰 马悦 王彬谕 Jueyi SUI 匡翠萍 刘建辉 雷刚 

机构地区：[1]College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China [2]College of Civil Engineering, Tongji University, Shanghai 200092, China [3]Guangxi Vocational and Technical College of Communications, Nanning 530216, China [4]Environmental Engineering Program, University of Northern British Columbia, Prince George, BC, Canada [5]Island Research Center, State Oceanic Adminisiration, Pingtan 350400, China [6]Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

出　　处：《Journal of Hydrodynamics》2016年第4期690-701,共12页水动力学研究与进展B辑（英文版）

基　　金：supported by the Marine Public Welfare Pro-gram of China(Grant No.201305003)

摘　　要：The Longfengtou Beach in the Haitan Bay, located in Fujian Province of China and facing the Haitan Strait, has been suffering severe erosion due to the construction of seawalls. A simple beach nourishment project implemented has not achieved the anticipated beach restoration. Thus a practical solution has to rely on a combination with near-shore marine structures. In this study, a 2-D calibrated flow model is set up to investigate the effects of three different layouts of near-shore marine structures on the tidal current. It is shown that the breakwaters situated in both the north and south ends play a vital part in the protection against erosion. The offshore breakwaters can serve as a barrier to obstruct the current circulation then reduce the current velocity. The groyne linking the Guimo islet and the coast significantly reduces the south-to-north water exchange through the channel and redirects the current direction nearly perpendicular to the north breakwater, which cuts off the longshore transport that may have a negative influence on the beach, especially, the northern part. It is also noted that the monsoon at the site with different directions increases the current velocity. In general, proper layouts of marine structures can reduce the current velocity thus lead to less intense sand transport near the beach.The Longfengtou Beach in the Haitan Bay, located in Fujian Province of China and facing the Haitan Strait, has been suffering severe erosion due to the construction of seawalls. A simple beach nourishment project implemented has not achieved the anticipated beach restoration. Thus a practical solution has to rely on a combination with near-shore marine structures. In this study, a 2-D calibrated flow model is set up to investigate the effects of three different layouts of near-shore marine structures on the tidal current. It is shown that the breakwaters situated in both the north and south ends play a vital part in the protection against erosion. The offshore breakwaters can serve as a barrier to obstruct the current circulation then reduce the current velocity. The groyne linking the Guimo islet and the coast significantly reduces the south-to-north water exchange through the channel and redirects the current direction nearly perpendicular to the north breakwater, which cuts off the longshore transport that may have a negative influence on the beach, especially, the northern part. It is also noted that the monsoon at the site with different directions increases the current velocity. In general, proper layouts of marine structures can reduce the current velocity thus lead to less intense sand transport near the beach.

关 键 词：Longfengtou Beach BREAKWATER groyne tidal current beach erosion MONSOON 

分 类 号：P753[交通运输工程—港口、海岸及近海工程]