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首页> 外文期刊>Proceedings of the International Conference on Coastal Engineering >COUPLED HYDRODYNAMIC-HYDROLOGICAL MODELING FOR STORM SURGE INUNDATION IN THE COASTAL AREA
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COUPLED HYDRODYNAMIC-HYDROLOGICAL MODELING FOR STORM SURGE INUNDATION IN THE COASTAL AREA

机译：沿海地区风暴潮淹没的水动力-水文耦合模拟

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Tropical cyclone easily causes inundation damage to low-lying coastal area and the damage may be amplified due to tide motion, sea-level rise, riverine discharges. Specifically, typhoons are accompanied by intensive rainfall, which will of course raise the river water level and thus enhance the flooding damages. If the tidal cycle coincides the high water, flooding will be even aggravated. In the present study, we simulated storm surge motions at the coastal area considering combined effects of tidal and river discharge with aim to improve the accuracy of flooding prediction. The quasi 3-dimension ocean circulation model, Delf3D was used which solves the unsteady shallow water equation in the 2D and 3D. Since Delft3D is much applicable to accommodate the indirect flooding factors such as riverine discharge and short waves, outer-coupled modeling system was established to account for combined tide-surge-riverine discharge effects. In such integrated system, 11 tidal constituents were input as open boundary condition using TPXO 7.2 model, while the water level per unit time was preliminary calculated by HEC-HMS model and input as the upstream boundary conditions for river inside the domain. Typhoon MAEMI which attacked Masan city located at southern coast of South Korea and caused severe inundation damages in 2003 was selected for the study event. Basic information for typhoon such as path, wind speed, atmospheric pressure every 3 hours was provided by the Korea Meteorological Agency and was adopted. The simulation was implemented with tide and storm surge boundary conditions focusing on the target area, Masan, while the additional consideration on the discharge of the river inside the domain was also made. Simulated water level at the fixed location was compared to the observation for its verification and the extent of inundation areas of Masan were compared between observed and calculated. The marginal contribution of riverine discharge on the flooding area(or depth) was assessed by comparing tide-surge with tide-surge-riverine discharge simulations. Finally, the importance of the specific consideration on the riverine discharge during storm surge modeling can be addressed.
机译：热带气旋很容易对低洼的沿海地区造成淹没破坏，并且由于潮汐运动，海平面上升和河道排放物，破坏可能会加剧。具体而言，台风伴随着强降雨，这当然会提高河水水位，从而加剧洪水的危害。如果潮汐周期与高水位相吻合，洪水甚至会加剧。在本研究中，我们考虑了潮汐和河流流量的共同影响，模拟了沿海地区的风暴潮运动，旨在提高洪水预报的准确性。使用准三维海洋环流模型Delf3D求解2D和3D中的非稳态浅水方程。由于Delft3D非常适用于适应诸如河水排放和短波之类的间接洪水因素，因此建立了外部耦合建模系统来考虑潮汐浪涌-河水合并排放的影响。在这样的集成系统中，使用TPXO 7.2模型输入11个潮汐成分作为开放边界条件，而使用HEC-HMS模型初步计算每单位时间的水位并将其作为域内河流的上游边界条件输入。研究活动选择了台风MAEMI，该台风袭击了位于韩国南部海岸的马山市，并在2003年造成了严重的淹没破坏。每隔3个小时，大韩民国气象厅就提供有关台风的基本信息，例如路径，风速，大气压，并予以采用。模拟是在潮汐和风暴潮边界条件集中于目标区域Masan的情况下进行的，同时还考虑了域内河流的流量。将固定位置的模拟水位与观测值进行比较，以进行验证，并对观测到的和计算出的Masan淹没区域的范围进行比较。通过将潮涌与潮涌-河道泄洪模拟进行比较，评估了河流排放对洪水区域（或深度）的边际贡献。最后，可以解决风暴潮建模过程中对河流排放的特殊考虑的重要性。

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