石浦港下湾门航道工程潮流数值模拟研究

Tidal current numerical simulation of Xiawanmen channel project of Shipu port

依据最新的水文实测资料,对石浦港的潮汐潮流特征进行了分析;并建立了基于不规则三角形网格的二维潮流数学模型,根据实测资料对模型进行了验证。在验证的基础上,对下湾门5万t级航道工程(开挖及炸礁通航)实施前后的流场进行了数值模拟计算,根据计算结果对工程前后的潮流特征及其变化进行了分析。研究结果表明:(1)工程海区潮汐属于正规半日潮类型,潮流性质属正规半日潮流型,潮流运动呈往复流形式;(2)岸线走向与涨落潮流走向基本一致;(3)航道总体挖深较小,流速变化很小,并未改变大范围海域潮流运动整体特征;开挖段航道流速呈减小的趋势,深槽水域流速呈增加趋势;(4)炸礁使得口门处航道轴线水域的流场趋于平顺,流向与航道走向基本一致,对周边流场基本没有影响;(5)方案实施后,对潮位变化无影响;下湾门口门处潮量增加,而其他口门潮量降低;(6)航道转弯位置、进港口门以及外海航道处横流较强,其他区段横流较弱。

According to the latest hydrological measured data, the characteristics of the tide and tidal current in Shipu port were analyzed. Then an 2-D tidal current mathematical model with irregular triangular grids was set up, and verification and validation were carried out on the basis of the measured data. Based on the simulation results, analyses were made on the change of flow field after the project of 50 000 DWT channel in Xiawanmen （excavation and rock blasting）. The study results show that： （1）at the project sea area,the tides are regular semidiurnal tides, and the tidal current motion is reciprocal. （2） the trends of coastline and fluctuation trend are basically consistent. （3）as the channel excavation is small,the velocity variation is small, and it will not change the whole characteristics of the wide area on sea. At the excavated channel, the velocity is decreasing, and the velocity of deep channel tends to increase.（4） because of the rock blasting,the flow field near channel axis tends to be smooth. The velocity direction and the channel trends are consistent. （5） after the implementation of the project, there is little influence on tidal levels. The tidal volume at the entrance of Xiawanmen increases,and the other tends to reduce.（6）the crosscurrent at the channel turning point,inlet port and open sea is stronger than that of other position.