新工程条件下天津港区水流及潮汐特征值变化预测分析

Prediction and analysis of flow and tidal characteristic quantities in Tianjin Port area under new engineering conditions

采用二维潮流数学模型,对天津港北港池开通和导堤延伸方案实施后港内流场及港区潮汐特征值变化进行了研究。结果表明,工程方案的实施对港内潮汐特征值影响较小;导堤延伸形成的新港区口门处存在环流,环流范围大、持续时间长,容易在口门内区域形成泥沙淤积;港内其他部分基本呈往复流,流速较小;港内清水线位置外移至东突堤附近,西港区和北港池由于水体泥沙含量较低,泥沙淤积较轻;北航道与西航道交叉处在涨潮转落潮的一段时间内形成环流,有可能在此处形成泥沙淤积。

In this paper, the two-dimensional mathematical model was taken into study on variants of current field and tidal characteristic quantities in Tianjin Port after the north port pool and dike extension have been built. The results show that the implementation of engineering has small effect on the tidal characteristic quantities. The circulation is existed inside the new entrance of the two-dike extension position, and it has a wide range and long duration so sediment is easy to silt in this area. Currents at other parts of the harbor are reciprocating flows basically, the velocity is very small.The location of clear-muddy line moves to Dongtudi,and sedimentation in west harbor area and north harbor area is relatively slight. At the intersection point of north and west channel, a circumfluence may be formed at the period of flood-tide to ebb-tide, and it is also possible to silt.