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岬湾海岸海滩养护工程对水体交换的影响
引用本文:匡翠萍,董智超,顾杰,李文斌.岬湾海岸海滩养护工程对水体交换的影响[J].同济大学学报(自然科学版),2019,47(6):0769-0777.
作者姓名:匡翠萍  董智超  顾杰  李文斌
作者单位:同济大学 土木工程学院, 上海 200092,同济大学 土木工程学院, 上海 200092,上海海洋大学 海洋生态与环境学院, 上海 201306,同济大学 土木工程学院, 上海 200092
基金项目:国家自然科学基金(41776098);中央海岛和海域保护资金项目(国海办字[2016]612号)
摘    要:岬湾海岸内岬头后侧水动力条件较弱容易造成水体生态环境退化,水环境改善可归结为控制污染物,而水体交换能力的强弱反映了水体自净能力.采用MIKE 21软件建立潮流和保守物质输运模型对人工岬湾内部进行分区研究,引入时间尺度指标定量分析水体交换对海滩养护的响应.由于海滩养护工程中沙坝与水流走向保持基本平行,沙坝修建后使得岬头后侧环流减弱,沙坝坝顶处流速增加,两沙坝间通道流速减小.滩肩前方海域流速减小,两沙坝后侧的流速减少更多.人工岬头与沙坝之间形成潮汐通道使得靠近岬头处流速有所增加,工程后滞留时间缩短;其中岬湾内近岬头的2个子区域滞留时间减少量较多,岬湾内中部区域滞留时间变化不明显.波浪和风场均会促进水体交换,但由于波浪受到风场影响,波浪和风场共同作用下滞留时间并不为单独条件的线性叠加关系.

关 键 词:岬湾海岸  水体交换  海滩养护  潮流  保守物质输运模型
收稿时间:2018/6/28 0:00:00
修稿时间:2019/4/25 0:00:00

Influence of Beach Nourishment Project on Water Exchange in Headland-bay Coast
KUANG Cuiping,DONG Zhichao,GU Jie and LI Wenbin.Influence of Beach Nourishment Project on Water Exchange in Headland-bay Coast[J].Journal of Tongji University(Natural Science),2019,47(6):0769-0777.
Authors:KUANG Cuiping  DONG Zhichao  GU Jie and LI Wenbin
Abstract:The hydrodynamic conditions at the back of headlands in a headland-bay are relatively weak, which may be easy to cause deterioration of water ecological environment. The water environment can be improved by controlling the destination of pollutant, hence the capacity of water exchange reflects waterbody self-purification capacity. MIKE 21 is employed to establish tidal current and conservative mass transport model, in which the headland bay coast is divided three sub-regions, and the time-scale quantitative measurement is introduced to discuss the responses of water exchange to the beach nourishment project. Due to the orientation of sandbars in the beach nourishment project is basically parallel to the main direction of current, the circulations in the back of headland are weakened, and the velocity increases at the top of the sandbars while decreases between the two sandbars. The velocity decreases in front of the berm and decreases more in the back of sandbars. The increased current velocity in the tidal inlet between artificial headland and sandbar shortens the residence time after the beach nourishment project. The reductions of residence time in the two sub regions around the headlands are much larger than that in the middle sub-region. Both wave and wind promote water exchange. However, because wave is also affected by wind, the residence time under both wave and wind conditions is not equal to the linear superposition of residence time under wave condition and wind condition respectively.
Keywords:headland-bay coast  water exchange  beach nourishment  tidal current  conservative mass transport model
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