环抱式单口门港池水体交换能力研究

On water exchange ability for encircled basin with one entrance

沿海港口的环抱式单口门港池可起到防浪和减少泥沙回淤的作用,但此种港池布置对于港区内外水体交换是不利的。在港池口门朝向正对波浪情况下,港池水体随涨潮流增加、落潮流减小而出现港池内水位涌高,导致港池内外水体交换量减小、港池水环境容量下降。以浙江台州温岭港为例,在单纯潮流及波流共同作用两种水情下,通过模拟规划方案下港池内外水质点运动轨迹变化及计算口门通过潮量的变化来探讨该类型港池对污染物输移及水体交换方面的特点,并提出相应的解决办法。

The encircled harbor with one entrance can break waves and reduce sands in estuary, but it is disadvantageous for the water exchange flux for the harbor. The amount of water in harbor basin will increase with flood tidal flow and decrease with ebb tidal flow when the entrance of the harbor exposes to the wave, which causes the decrease of water exchange flux and the descent of water environment. Taking Taizhou Wenling harbor in Zhejiang province as an example, this paper discusses the characteristics of this kind of harbor concerning the contamination transport and water exchange flux through simulating the water particle track and computing the tidal storage by the numerical model with the control of only tide and both tide and wave. Corresponding solutions are also presented.