Numerical study on three-dimensional tidal current characteristics of Zhoushan Green Petrochemical Company
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摘要: 本文基于MIKE3平台建立宁波、舟山及其附近海域三维水动力模型，通过与实测数据进行潮流验证的基础上，对比了三维模型与二维模型的区别，并主要对舟山绿色石化三期围垦工程实施前后周边潮流场的变化影响进行了预测分析。结果表明：（1）同样的初始条件下，二维模型和三维模型的潮位和潮流验证结果都是良好的，而在某些情况下二维数值结果更接近于实测值；（2）三维垂向上的流速分布呈现出随水深增加而减小的趋势，总体上潮流拟合效果较好，其中0.6H水深以下的流速相对误差结果在10%～15%之间，考虑模型可能受未考虑风场和波浪影响的缘故，局部测站表层计算流速较实测值稍大；而垂向上的流向分布近乎一致；（3）围垦工程前后并未对工程周边潮流场有明显影响，仅在大鱼山岛东北侧、东南侧和西北角受“截弯取直”和小岛屿间水道围堵的影响，有局部潮流形态的改变。整体上看，以顺应岸线方向上的围垦工程布置方案会对局部近岸潮流产生影响，对外海大范围潮流场的影响几乎不计。Abstract: In this paper, MIKE3 is used to establish a three-dimensional hydrodynamic model of Zhoushan and Ningbo. Based on the tidal current verification with the measured data, the difference between the three-dimensional model and the two-dimensional model is compared. Also, the influence of the change of the tidal current field around the Zhoushan Green Petrochemical Phase III reclamation project before and after the implementation is mainly predicted and analyzed. The results show that: (1) Under the same initial conditions, the tidal level and tidal current validation results of two-dimensional model and three-dimensional model are good, and the two-dimensional results are closer to the measured values in some cases. (2) The three-dimensional vertical velocity distribution shows a decreasing trend with the increase of water depth. In general, the tidal current fitting is good, and the relative error of velocity below 0.6H water depth is between 10% and 15%. Considering that the model may not consider the influence of wind field and wave, the calculated surface velocity of local stations is slightly larger than the measured value; the vertical distribution of flow direction is nearly consistent. (3) Before and after the reclamation project, there was no obvious influence on the tidal current field around the project. Only in the northeast, southeast and northwest corner of Dayushan Island, affected by the “bend improvement” and the channel closure between small islands, there is a change in the local tidal current form. On the whole, the layout of reclamation projects conforming to the shoreline will have an effect on the local coastal tidal current, and almost no effect on the large scale tidal current field in the far sea.
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Key words:
- reclamation /
- tidal current /
- numerical simulation /
- MIKE3 /
- MIKE21
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图 8 中间层流速流向对比验证
Fig. 8 Comparative verification of velocity and direction in the middle layer
图 9 表层潮流场对比（上：涨急 下：落急）
Fig. 9 The comparison of tidal current field on the surface layer (up: rising; down: falling)
表 1 模型效率系数
Tab. 1 The index of agreement
流速/（cm·s−1） 流向/（°） 大潮 中潮 小潮 大潮 中潮 小潮 N14测站表层 0.87 0.85 0.85 0.90 0.99 0.90 N14测站中间层 0.95 0.96 0.83 0.88 0.97 0.86 N14测站底层 0.93 0.95 0.70 0.95 0.93 0.85 
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