Modelling Flood Wave Propagation as a Result of Dam Piping Failure Using 2D-HEC-RAS

Civil Engineering Journal Pub Date : 2023-10-01 DOI:10.28991/cej-2023-09-10-010

Mahmood J. Mohamed, I. Karim, Mohammed Y. Fattah, Nadhir Al-Ansari

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Abstract

In recent years, there has been a serious request for innovative, accurate approaches to be determined and controlled for dam failures. The present study aims to explore and evaluate the flood wave parameters that result from a dam break due to piping failure occurring in the body of the dam and routing the flood waves. Mosul Dam, which lies in the north of Iraq, and a reach of the Tigris River downstream the dam to Samarra Barrage at about 470 km are selected as a case study. A two-dimensional Hydrologic Engineering Center River Analysis System (2D HEC-RAS) and the Geographic Information System (GIS) have been supposed to be suitable for development calculations of the flood wave parameters based on the Digital Elevation Model (DEM) and land cover satellite images that enhance the calculations. The reservoir and two-dimensional flow area are delineated and incorporated with DEM. Manning`s coefficient for the whole area has been extracted according to the Land Cover satellite image, which showed that its value ranges between 0.025 to 0.037 with a correlation coefficient R2equal to 0.845 and 0.801 for the calibration and validation processes, respectively. The results of the scenario display a substantial performance of the maps produced from the model that represented the depth, velocity, and water surface elevation. All the maximum values of dam break parameters lie near the dam body and slightly decrease downstream. It is pre-eminent that the 2D HEC-RAS model is appropriate for analyzing and simulating the occurrence of dam breaches by visualizing the distribution of flood wave depth and velocities in two dimensions. Hence, the clear improvement in producing maps, which monitor the spread of hydrodynamic waves, gives an indication of risk areas that are threatened by inundation and aids in the formulation of emergency plans. Doi: 10.28991/CEJ-2023-09-10-010 Full Text: PDF

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利用 2D-HEC-RAS 模拟大坝管道故障导致的洪水波传播

近年来，人们迫切要求采用创新、准确的方法来确定和控制大坝溃坝。本研究旨在探索和评估由于坝体管道故障而导致的溃坝所产生的洪水波参数，以及洪水波的流向。本研究选择了位于伊拉克北部的摩苏尔大坝以及大坝下游至萨迈拉拦河坝约 470 公里处的底格里斯河河段作为案例。二维水文工程中心河流分析系统（2D HEC-RAS）和地理信息系统（GIS）被认为适用于基于数字高程模型（DEM）和土地覆盖卫星图像的洪水波浪参数的开发计算，从而增强了计算效果。水库和二维水流区域的划分与 DEM 相结合。根据土地覆盖卫星图像提取了整个区域的曼宁系数，结果显示其值在 0.025 至 0.037 之间，校准和验证过程的相关系数 R2 分别为 0.845 和 0.801。该方案的结果表明，模型绘制的水深、流速和水面高程图具有良好的性能。所有断坝参数的最大值都位于坝体附近，并在下游略有下降。二维 HEC-RAS 模型通过可视化二维洪水波深和波速的分布来分析和模拟溃坝的发生是非常合适的。因此，在制作监测水动力波扩散的地图方面有了明显改善，可显示受洪水威胁的危险区域，并有助于制定应急计划。Doi: 10.28991/CEJ-2023-09-10-010 全文：PDF

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Civil Engineering Journal

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