海阳中心渔港工程附近海域水动力及泥沙冲淤数值模拟

发布时间：2018-05-17 18:58

本文选题：MIKE21 + 海阳中心渔港工程　；参考：《中国海洋大学》2014年硕士论文

【摘要】：渔港的建设涉及到护岸建设、场地回填以及港池疏浚等环节，将会导致海岸线以及水深的变化，从而使得工程附近的水动力条件发生变化，流速、流向等因素的改变又会对污染物质输移以及泥沙淤积产生影响。由于工程一旦建成，这些影响便不可恢复，属于不可逆的影响。因此，工程施工前选择合理的设计方案显得尤为重要，合理的工程设计方案要求对海洋环境的影响要小。本文通过对海阳中心渔港工程附近海域水动力及泥沙冲淤的数值模拟研究，并通过分析数值模拟结果，得出合理最优的方案，为海阳中心渔港工程的建设提供科学指导。海岸地区一般水深较浅，潮流运动的水平尺度远大于垂直尺度，流速等水力学参数沿垂直方向的变化较水平方向的变化要小得多。因此，可以采用沿水深积分的平面二维水动力和泥沙输运模型来进行数值模拟。 MIKE21是丹麦水力研究所（简称DHI）开发的系列水动力学软件之一，属于平面二维自由表面流模型。MIKE21软件自1993年研发以来，，在国内外得到了广泛的应用，解决了大量地工程问题，为工程的建设提供了理论上的指导。本文基于MIKE21软件，建立了工程海域二维水动力模型以及泥沙输运模型，研究海阳中心渔港工程建设对附近海域水动力和泥沙冲淤的影响，选出较优方案，为海阳中心渔港的建设提供理论上的指导。主要的工作内容和结论如下： 1、本文通过对丁字河口、千里岩、古龙嘴与岸线围成的海域水深、地形资料的搜集，利用MIKE21软件，建立了二维水动力模型。并通过一些实测的数据对该模型的一些特征点进行了潮位、流速以及流向的验证。验证结果表明，该模型是可靠的，适用于实际工程项目中，还对工程区域大范围海域的流场特征进行了简要的分析。 2、在建立的水动力模型验证正确的基础上，利用MIKE21软件分别建立了海阳中心渔港两种方案建设后的二维水动力模型，并数值模拟了工程建设对工程附近海域水动力的影响。利用数值模拟结果，进行水动力变化的影响分析。对两种方案建设后对水动力场的影响进行了定量分析，通过对15个代表点的流速分析，表明方案1建设后流速的变化小于方案2建设后的流速差值变化，即方案1建设后对周围流场的影响小于方案2。 3、在水动力场的基础上，耦合了泥沙输运模型。数值模拟了波流耦合作用下全年和强浪风向SE（15m/s）大风作用24h后下，工程前和两种方案建设后海底的地形冲淤情况。两种工程方案分别建设后，对海阳港和冷家庄之间的外海海域海底地形变化影响均较小，不同方案建设后泥沙冲淤对海底地形变化影响的区别主要体现在工程附近区域。 4、无论是波流耦合作用下全年的冲淤趋势还是SE（15m/s）大风作用24h后的冲淤趋势，两种方案建设后港池内都有不同程度的淤积，但不会对通航造成影响；两种建设方案的差别主要体现在对拟建码头和岸线之间水道的冲刷作用加强，以及疏港路桥梁下水道冲刷程度的不同。根据冲淤数值模拟预测结果分析不同建设方案对工程附近疏港路稳定性的影响，方案1由于建立了东、西防波堤，使得疏港路附近的冲刷程度减小，能很好地保护疏港路的稳定。因此，通过泥沙输运模型的计算结果分析得出，方案1优于方案2。 5、结合水动力场和泥沙冲淤数值模拟预测结果，通过对比分析，可以得出方案1优于方案2。本文在水动力和泥沙冲淤数值模拟的基础上，选出了较优的方案，为海阳中心渔港的规划设计提供了决策的科学参考。
[Abstract]:The construction of the fishing port involves the construction of the revetment, the backfilling of the site and the dredging of the port, which will lead to the change of the coastline and the depth of the water, so that the hydrodynamic conditions in the vicinity of the project will change, the changes in the flow velocity and the flow direction will affect the transport and siltation of the pollutants. It is not reversible, which is irreversible. Therefore, it is very important to choose a reasonable design scheme before the construction, and the reasonable engineering design scheme requires small impact on the marine environment. In this paper, the numerical simulation of the hydrodynamic and sediment erosion and siltation in the sea area near the Haiyang central fishing port project is studied, and the numerical model is analyzed. Based on the results obtained, a reasonable and optimal plan is drawn up to provide scientific guidance for the construction of Haiyang central fishing port project.
In the coastal area, the water depth is generally shallow, the horizontal scale of the flow motion is far larger than the vertical scale, and the variation of the hydrodynamic parameters along the vertical direction is much smaller than that in the horizontal direction. Therefore, the two-dimensional hydrodynamic and sediment transport model along the depth of water can be used for numerical simulation.
MIKE21 is one of the series of hydrodynamics software developed by the Danish Hydraulic Research Institute (DHI). It belongs to the plane two-dimensional free surface flow model.MIKE21 software since its development in 1993. It has been widely used both at home and abroad. It has solved a lot of engineering problems and provided theoretical guidance for the construction of the project.
In this paper, based on MIKE21 software, a two-dimensional hydrodynamic model and a sediment transport model in the sea area are established, and the influence of the construction of Haiyang central fishing port on the hydrodynamic and sediment erosion and siltation in the surrounding sea area is studied. The optimal scheme is selected to provide theoretical guidance for the construction of the fishing port in Haiyang. The main work contents and conclusions are as follows:
1, by means of MIKE21 software, a two-dimensional hydrodynamic model is established through the collection of water depth and topographic data in the waters of the estuarine estuary, thousand li rock, Gulong mouth and shore line, and some characteristic points of the model are verified by some measured data. The results show that the model is reliable, It is applied to practical engineering projects, and the flow field characteristics of large areas in engineering area are briefly analyzed.
2, on the basis of the validation of the established hydrodynamic model, the two dimensional hydrodynamic model of two schemes in Haiyang central fishing port is established by using MIKE21 software, and the influence of the construction on the hydrodynamic forces near the sea area is numerically simulated. The effects of the numerical simulation on the hydrodynamic changes are analyzed. Two schemes are used. After the construction, the effect of the hydrodynamic field is quantitatively analyzed. Through the analysis of the velocity of the 15 representative points, it is shown that the change of flow velocity after the construction of scheme 1 is less than that after the construction of scheme 2, that is, the influence of the scheme 1 on the surrounding flow field is less than that of the scheme 2..
3, on the basis of the hydrodynamic field, the sediment transport model is coupled, and the terrain erosion and siltation of the seabed after the construction of SE (15m/s) and the wind action of strong wave wind to SE (15m/s) is simulated. After the construction of the two engineering schemes, the seabed topography between the outer sea area and the sea area between Haiyang port and cold house Zhuang Zhuang Zhuang Zhuang Zhuang Zhuang Zi Zhuang Zhuang Zhuang Zhuang Zhuang Zhuang Zhuang Zhuang Autonomous Region is constructed. The difference of the influence of sediment erosion and deposition on the seabed terrain changes is mainly reflected in the vicinity of the project.
4, the erosion and silting trend of the whole year under the coupling of wave and current is also the trend of the erosion and siltation after the SE (15m/s) gale action 24h. After the construction of the two schemes, there are different degrees of siltation in the harbor pool, but it will not affect the navigation, and the difference between the two construction schemes is mainly reflected in the enhancement of the scouring effect of the waterway between the proposed wharf and the shore line, and The influence of different construction schemes on the stability of the dredging Road near the project is analyzed according to the numerical simulation of the erosion and siltation. Scheme 1 because of the establishment of the East and West Breakwater, the degree of scour near the dredge road is reduced, and the stability of the dredging road can be well protected. Therefore, the sediment transport model is adopted. The analysis of the calculation results shows that the scheme 1 is better than the scheme 2..
5, combined with the numerical simulation results of hydrodynamic field and sediment erosion and deposition, it can be concluded that scheme 1 is better than scheme 2. through comparative analysis.
On the basis of numerical simulation of hydrodynamic and sediment scour and deposition, a better scheme has been selected, which provides a scientific reference for the planning and design of Haiyang central fishing port.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.2;TV148

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