The use of hydraulic models for carrying out flood simulations is a common practice globally. The current study used HEC-RAS (2D) in order to simulate different flood scenarios on the River Yesil (Ishim). Comparison of different mesh sizes (25, 50 and 75 m) indicated no significant difference in model performance. However, a significant difference was observed in simulation time. In addition, the inclusion of breaklines showed that there was a slight improvement in model performance and a shortening of the simulation time. Sensitivity analysis and the consequent manual calibration of sensitive parameters resulted in a slight improvement (an increase in the model accuracy from 58.4% for uncalibrated to 59.7% for calibrated). Following the simulations inundation maps for 10-, 20- and 100-year flood events were obtained. Hazard classification of the flood extents generated indicated that the settlements of Zhibek Zholy and Arnasay were flooded in all the simulated events. Volgodonovka village experienced flooding when a 100-year flood event was simulated. On the other hand, settlement No. 42 did not experience any flooding in any of the scenarios. The model results also demonstrate that the Counter-Regulator was not overtopped in the event of the 100-year hydrograph.

中文翻译：

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HEC-RAS (2D) 在哈萨克斯坦 Yesil (Ishim) 河洪水灾害地图生成中的应用

使用水力模型进行洪水模拟是全球普遍的做法。当前的研究使用 HEC-RAS (2D) 来模拟 Yesil (Ishim) 河上的不同洪水情景。不同网格尺寸（25、50 和 75 m）的比较表明模型性能没有显着差异。然而，在模拟时间上观察到显着差异。此外，包含隔断线表明模型性能略有改善并缩短了模拟时间。敏感性分析和随后对敏感参数的手动校准导致了轻微的改进（模型准确度从未校准的 58.4% 增加到校准的 59.7%）。在模拟之后，获得了 10 年、20 年和 100 年洪水事件的淹没图。所产生的洪水范围的危害分类表明，在所有模拟事件中，Zhibek Zholy 和 Arnasay 的定居点都被洪水淹没。在模拟 100 年一遇的洪水事件时，Volgodonovka 村经历了洪水。另一方面，第 42 号定居点在任何情况下都没有遇到任何洪水。模型结果还表明，在 100 年水文过程线事件中，反调节器没有被超过。