{"title":"基于HEC-RAS和HEC-GeoRAS的溃坝分析——以Kesem Kebena大坝为例","authors":"Abimael Leoul, Nebiyou Kassahun","doi":"10.4236/OJMH.2019.94007","DOIUrl":null,"url":null,"abstract":"Ethiopia has been booming with active construction of \ndams within the past few decades for different infrastructural needs, but has \nnever experienced demolition or failure of dams in its history; hence little \nattention is being given to possible breach scenarios of dams and the resulting \nfloodings. This paper makes analysis of the possible breach of kesem dam and \nthe resulting flood inundation. In this study, the dam has been checked for \nboth overtopping and piping failure modes using one dimensional river analysis \nmodel called HEC-RAS. Empirical equations were used to predict dam breach \nparameters of the two failure modes for use in this model. PMF inflow with a \npeak 9237.77 m3/s is used as an input to the reservoir to check if \novertopping failure was possible. The spill way has proven to have adequate capacity \nfor the flood due to the PMF. Therefore, breaching of the embankment was not \npossible. Piping failure was also simulated in HEC-RAS and the resulting breach \ndue to piping failure, was analyzed and flood hydrograph was obtained at \ndifferent cross sections along the river. These are flood hydrographs at 20 km, \n40 km and 60 km at the downstream. The resulting flood plain was also mapped \nusing HEC-GeoRas to show the extent of flooding.","PeriodicalId":70695,"journal":{"name":"现代水文学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":"{\"title\":\"Dam Breach Analysis Using HEC-RAS and HEC-GeoRAS: The Case of Kesem Kebena Dam\",\"authors\":\"Abimael Leoul, Nebiyou Kassahun\",\"doi\":\"10.4236/OJMH.2019.94007\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Ethiopia has been booming with active construction of \\ndams within the past few decades for different infrastructural needs, but has \\nnever experienced demolition or failure of dams in its history; hence little \\nattention is being given to possible breach scenarios of dams and the resulting \\nfloodings. This paper makes analysis of the possible breach of kesem dam and \\nthe resulting flood inundation. In this study, the dam has been checked for \\nboth overtopping and piping failure modes using one dimensional river analysis \\nmodel called HEC-RAS. Empirical equations were used to predict dam breach \\nparameters of the two failure modes for use in this model. PMF inflow with a \\npeak 9237.77 m3/s is used as an input to the reservoir to check if \\novertopping failure was possible. The spill way has proven to have adequate capacity \\nfor the flood due to the PMF. Therefore, breaching of the embankment was not \\npossible. Piping failure was also simulated in HEC-RAS and the resulting breach \\ndue to piping failure, was analyzed and flood hydrograph was obtained at \\ndifferent cross sections along the river. These are flood hydrographs at 20 km, \\n40 km and 60 km at the downstream. The resulting flood plain was also mapped \\nusing HEC-GeoRas to show the extent of flooding.\",\"PeriodicalId\":70695,\"journal\":{\"name\":\"现代水文学期刊(英文)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2019-09-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"9\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"现代水文学期刊(英文)\",\"FirstCategoryId\":\"1089\",\"ListUrlMain\":\"https://doi.org/10.4236/OJMH.2019.94007\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"现代水文学期刊(英文)","FirstCategoryId":"1089","ListUrlMain":"https://doi.org/10.4236/OJMH.2019.94007","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Dam Breach Analysis Using HEC-RAS and HEC-GeoRAS: The Case of Kesem Kebena Dam
Ethiopia has been booming with active construction of
dams within the past few decades for different infrastructural needs, but has
never experienced demolition or failure of dams in its history; hence little
attention is being given to possible breach scenarios of dams and the resulting
floodings. This paper makes analysis of the possible breach of kesem dam and
the resulting flood inundation. In this study, the dam has been checked for
both overtopping and piping failure modes using one dimensional river analysis
model called HEC-RAS. Empirical equations were used to predict dam breach
parameters of the two failure modes for use in this model. PMF inflow with a
peak 9237.77 m3/s is used as an input to the reservoir to check if
overtopping failure was possible. The spill way has proven to have adequate capacity
for the flood due to the PMF. Therefore, breaching of the embankment was not
possible. Piping failure was also simulated in HEC-RAS and the resulting breach
due to piping failure, was analyzed and flood hydrograph was obtained at
different cross sections along the river. These are flood hydrographs at 20 km,
40 km and 60 km at the downstream. The resulting flood plain was also mapped
using HEC-GeoRas to show the extent of flooding.