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首页> 外文会议>International Symposium on Earth Hazard and Disaster Mitigation >Operational Prediction of Rip Currents using Numerical Model and Nearshore Bathymetry from Video Images
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Operational Prediction of Rip Currents using Numerical Model and Nearshore Bathymetry from Video Images

机译：从视频图像中使用数值模型和近岸沐浴法的RIP电流的操作预测

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摘要

Rip currents are one of the most dangerous coastal hazards for swimmers. In order to minimize the risk, a coastal operational-process based-model system can be utilized in order to provide forecast of nearshore waves and currents that may endanger beach goers. In this paper, an operational model for rip current prediction by utilizing nearshore bathymetry obtained from video image technique is demonstrated. For the nearshore scale model, XBeach~1 is used with which tidal currents, wave induced currents (including the effect of the wave groups) can be simulated simultaneously. Up-to-date bathymetry will be obtained using video images technique, cBathy~2. The system will be tested for the Egmond aan Zee beach, located in the northern part of the Dutch coastline. This paper will test the applicability of bathymetry obtained from video technique to be used as input for the numerical modelling system by comparing simulation results using surveyed bathymetry and model results using video bathymetry .Results show that the video technique is able to produce bathymetry converging towards the ground truth observations. This bathymetry validation will be followed by an example of operational forecasting type of simulation on predicting rip currents. Rip currents flow fields simulated over measured and modeled bathymetries are compared in order to assess the performance of the proposed forecast system.
机译：RIP电流是游泳者最危险的沿海危险之一。为了最大限度地减少风险，可以利用沿海操作过程的模型系统，以便提供可能危及海滩观众的近岸波浪和电流的预测。在本文中，证明了利用从视频图像技术获得的近岸浴约定的撕裂电流预测的操作模型。对于近岸规模模型，可以同时模拟Xbeach〜1，其中潮汐电流，波感应电流（包括波组的效果）。使用视频图像技术，CBATHY〜2获得最新的沐浴术。该系统将对位于荷兰海岸线北部的Egmond Aan Zee海滩进行测试。本文将测试来自视频技术获得地形的适用性通过使用调查的水深和使用视频水深。结果模型的结果进行比较的模拟结果被用作用于数值建模系统输入表明视频技术能够产生地形朝向会聚地面真理观察。这种浴室算法将随后是预测RIP电流的操作预测类型的示例。比较撕裂电流通过测量和建模的浴型模拟的流场进行比较，以评估所提出的预测系统的性能。

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