ABSTRACT

Main aim of the paper is to emphasise the advantage of 1D and 2D hydrodynamic models coupling in simulating flood inundations using high resolution Digital Terrain Models. The developed flood early warning model was calibrated and validated thoroughly at critical locations using historic observed discharge data and point rainfall data of about 350 stations. The flood inundation simulation model was prepared using flexible mesh approach and flood inundation simulations were compared with the satellite imagery of Radarsat2. 1D hydrodynamic model was integrated with 2D hydrodynamic model by standard links for seamless hydrodynamic modelling. It is found that computational time has reduced drastically due to integration of 1D and 2D hydrodynamic models. Web-enabled spatial flood early warning system is developed to disseminate flood advisories in real-time. Computed peak discharge is found to be more than 87% accurate when compared to field measurements subsequently with a forecast lead time of 52 hours.

摘要

本文的主要目的是强调使用高分辨率数字地形模型模拟一维和二维流体动力学模型在洪水泛滥中的优势。使用历史观测流量数据和约350个站的点降雨数据，在关键位置对开发的洪水预警模型进行了校准和彻底验证。使用柔性网格方法建立洪水淹没模拟模型，并将洪水淹没模拟与Radarsat2的卫星图像进行比较。通过标准链接将1D流体动力模型与2D流体动力模型集成在一起，以进行无缝流体动力建模。发现由于1D和2D流体动力学模型的集成，计算时间已大大减少。开发了基于Web的空间洪水预警系统，以实时传播洪水通报。与随后的实地测量相比，预测的前置时间为52小时，发现计算出的峰值放电的准确度超过87％。