围填海对芝罘湾潮流场和纳潮量的影响研究

A study on effects of reclamation on tidal flow field and tidal prism of Zhifu Bay

本文基于MIKE21水动力数值模型,以1985年、1993年、2010年和2017年4个时期为代表年份,定量识别了芝罘湾围填海工程引起的潮流场及纳潮量的变化情况。结果表明:(1)流场:潮流以往复流运动为主,湾口流速最大可达32.99 cm/s,湾底流速较小,最大为9.49 cm/s,湾口流速远大于湾底流速。围填海工程使湾内流速发生了明显变化,湾内9个代表点位的流速均有所减小,湾口流速变化率较小,湾顶流速变化率较大,2017年湾底流速相比于1985年最高减小量达到39%。(2)纳潮量:芝罘湾在围填海前后4个时期的纳潮量分别为4.701×10^(7)m^(3)、4.469×10^(7)m^(3)、3.854×10^(7)m^(3)和3.690×10^(7)m^(3),对比发现,围填海工程的进行使湾内面积持续减小,纳潮量也持续减小,1985-2017年减小了21.51%,围填海工程弱化了芝罘湾的水动力条件。

In this study,we determined the variations of tidal flow field and tidal prism caused by reclamations of Zhifu Bay by taking years 1985,1993,2010 and 2017 as the typical and using MIKE 21 hydrodynamic model as analyzing tool.The tidal flow in Zhifu Bay is mainly in an oscillating manner.The flow velocity at bay mouth is up to 32.99 cm/s whereas that at bay bottom is slower than that at bay mouth with a maximum of 9.49 cm/s.The reclamations significantly changed the tidal flow velocity.The flow velocities at 9 representative sites all reduced during studying periods.The reduction rate in flow velocities at bay bottom is larger than that at bay mouth.The maximum reduction rate in flow velocity at bay bottom is up to 39%between 1985 and 2017.The tidal prisms in Zhifu Bay for the 4 studying years are 4.701×10^(7)m^(3),4.469×10^(7)m^(3),3.854×10^(7)m^(3)and 3.690×10^(7)m^(3),respectively.The reclamations have shrunk down the water area within the bay which leads to decrease in tidal prism of 21.51%between 1985 and 2017.Our findings indicated that reclamations have worsened the hydrodynamic condition within the sea area.