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Dam Break Analysis of Idukki Dam using HEC RAS
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Dam Break Analysis of Idukki Dam using HEC RAS
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3410 Dam Break Analysis of Idukki Dam using HEC RAS Abhijith R1, Amrutha G2, Gopika Vijayaraj3, Rijisha T V4 1 Asst. Professor, Department of Civil Engineering, Viswajyothi College of Engineering and Technology, Vazhakulam, Kerala, India 2,3,4 UG Scholar, Department of Civil Engineering, Viswajyothi College of Engineering and Technology, Vazhakulam, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Idukki reservoir, with an active capacity of 1459000000 m3 is a part of the Idukki Hydroelectric Project and comprises of Idukki Arch Dam, Kulamavu Dam and Cheruthoni dam. During the monsoon period when the dams are full at its Maximum Reservoir Level (MRL) or in an adverse event of dam break, the maximum discharge gets released from these dams. This results into floods on downstream and may cause disaster in cities or towns settled on the banks of the reservoir. This paper presents a case study of dam break analysis of Idukki Arch Dam using HEC-RAS software which involves prediction of dam break parameters, flood hydrograph, time of arrival of flood wave, peak flow. The resulting flood wave is routed along downstream using unsteady flow equations. In order to correctly draw the flood risk maps, the HEC-RAS method has been used together with the HEC-GeoRAS extension as an extension to the ongoing study. Key Words: Idukki dam, Dam break analysis, Flood modelling, HEC-RAS 1. INTRODUCTION Dam is a barrier that impounds water that plays a vital role in the economy of the country. The water retained is generally used for irrigation, aquaculture, industrial use, human consumption, etc. However, in the unlikely and rare event of their failure, these may cause catastrophic flooding in the downstream area which may result in huge loss and damage to human life and property. In this study the dam break analysis and flood modelling of Idukki reservoir is done with the help of HEC-RAS. Hydrologic Engineering Center’s River Analysis System (HEC-RAS) modelling software developed by the U.S. Army Corps of Engineers, a standard for dam-breach flood-inundation models, is used to perform steady-flow simulations to model the dynamic nature of the flood wave produced by a dam-breach scenario. The reservoir consists of three dams. They are Idukki dam, Cheruthoni dam and Kulamavu dam. 2. SCOPE AND OBJECTIVE The prediction of the dam break flood is very important for the purposes of planning and decision making concerning to dam safety, controlling downstream developments, contingency evacuation planning and real time flood forecasting. For assessing the flood damage due to dam breach it is necessary to predict not only the possibility and mode of a dam failure, but also the flood hydrograph of discharge from the dam breach and the propagation of the flood waves. The studies are to map or delineate areas of potential flood inundation resulting from a dam breach, flood depth, flow velocity and travel time of the flood waves etc. Knowledge of the flood wave and flood-inundation area caused by a dam breach can potentially mitigate loss of life and property damage. The significance of the study is to develop the river hydraulics model, simulate a dam failure and map the resulting flood wave. The proper modelling of the hazards associated with dam break will assist in land use planning and developing emergency response plan to help mitigate catastrophic loss to human life and property that might be inflicted by floods. Following are the objectives of the study • To conduct dam breach analysis of Idukki Arch Dam using HEC-RAS 5.0 Dam-breach flood-inundation maps indicate areas that would be flooded as a result of a dam failure. The inundated areas depicted on flood-inundation maps are approximate, and accuracy of such maps is a function of the accuracy of the topographic data, the hydraulic models on which the maps are based, the assumptions made about the dam failure mode, and the initial flood wave. 3. METHODOLOGY Dam break analysis can be done using the flood routing techniques proposed by St. Venant’s equations for unsteady flow. His approach solves both the continuity and momentum equations for a differential volume of one- dimensional flow, where the forces on the control volume are limited to the effect of gravity, pressure variation, and friction or roughness of the channel walls. Mass is conserved in the solution and the effect of acceleration within the control volume and momentum fluxacross the upstream and downstream faces are considered. It consists of two independent variables Q and t. Solution of this equation depends on the number of cross-sections. Because of the complexity in solving the entire equation simultaneously software HEC-RAS has
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3411 been selected. The methodology adopted in this research is that the salient features and breach parameters that are collected from after the site visit is provided as input to the software where we obtain the flood hydrograph as the output for dam break analysis. HEC-RAS is Hydrologic Engineering Center’s River Analysis System software. It is developed by U.S Army Corps of Engineers. This software allows to perform one dimensional steady flow, unsteady flow calculations, sediment transport computations and water quality analysis. One dimensional approach to flood inundation modeling only considers one dimension of the flood flows in the direction of x axis(downstream direction). It is best represented by St. Venant’s formula used for calculating the one dimensional flow of the flood wave. The lateral and longitudinal geometry of the stream determines how peak of the flood wave s reduced as it moves downstream, the travel time of the peak flood between points of interest, maximum water stage at point of interest and change in shape of hydrograph as it moves downstream. These effects are governed by factors such as bed slope, cross sectional area and geography of the main channel. In order to do the dam break analysis and flood modelling the salient features regarding the reservoir, the dams that have to be analyzed etc. are to be collected. To analyze the dam for dam break analysis we require data like breach data flow data, Manning’s n etc. The input for flood modelling are input for flood modelling storage area data, inline structure data, geometric data, entering flow data and the boundary conditions. 4. STUDY AREA 4.1 Idukki Reservoir Idukki reservoir consist of three dams. They are Idukki dam, Kulamavu dam, and Cheruthoni dam. The water impounded by these three dams of Idukki, Cheruthoni & Kulamavu has formed a single reservoir spread over 60 km on a height of 2300 ft above Mean Sea Level.The Idukki Dam is a double curvature arch dam constructed across Periyar River in a narrow gorge between two granite hills. Cheruthoni Dam is located 1 km west of Idukki dam. The spill way of the Idukki Reservoir is in the Cheruthony dam. Kulamavu Dam was constructed to prevent the water escape through a rivulet called Kalivally, 30 km west to Idukki Arch Dam. It is a 100 metres tall Masonry gravity dam. Construction of this Cheruthoni Dam, Idukki Arch Dam and Kulamavu Dam created an artificial lake of 60 km2 and the water stored, is used for production of electricity at the Moolamattom Power house. The power house at Moolamattom is the biggest underground power station in India and the pressure shaft is the largest in the country. Cheruthony is the largest and highest gravity dam in Kerala. Storage of water in Idukki Reservoir started in February, 1973. Moolamattom Power Station was commissioned in February 1976 by Prime Minister Indira Gandhi. 4.2 Idukki Dam The Idukki Dam is a double curvature arch dam constructed across the Periyar River in a narrow gorge between two granite hills Kuravan and Kuravathi in Kerala, India. At 167.68 meters, it is one of the highest arch dams in Asia. It was constructed and is owned by the Kerala State Electricity Board. It supports a 780 MW hydroelectric power station in Moolamattom, which started generating power on 4 October 1975. Technically, the dam type is a concrete, double curvature parabolic, thin arc dam. This dam was constructed along with two other dams at Cheruthoni and Kulamavu. Together, the three dams have created an artificial lake that is 60 km² in area. The stored water is used to produce electricity at the Moolamattom Power house, which is located inside nearby rocky caves. The Government of Canada aided in the building of the dam with long term loans and grants. Table -1: Salient features of Idukki Arch Dam Location Idukki,kerala, India Type Concrete double curvature,Parabolic thin arch Impounds Periyar River Height 169.91m(554ft) Length 365.85m1200ft) Width at the top 7.32m Dam Volume 450000cu.m Spillways Nil No.of cross sections 7 Dam crest length 513.0 5. DAM BREAK ANALYSIS 5.1 Input Parameters The following data are required for a typical dam break analysis: Salient features of dam in study reach of the river. Design flood hydrograph. Cross-sections of the river from dam site to the most downstream location of interest. Elevation - storage/area relationship of the reservoir. Manning's roughness coefficient for different reaches of the river under study. Breach Geometry. Time taken for Breach formation. Reservoir elevation at start of failure and initial water elevation
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3412 The flood hydrograph obtained by giving these salient features in the software is used as the input for flood modelling in HEC GEO RAS 5.1.1 Breach Data and Cross Sectional Details The breach parameters are time of breach formation, final bottom breach width, side slope of breach, final elevation of breach bottom, initial elevation of water level in the reservoir, elevation of water when breach begins to form and elevation of top of dam. The cross sectional deatails regarding the profile is also provided. 5.1.2 Flow Data Boundary conditions are required in order to perform the calculations. In a subcritical flow analysis, boundary conditions are required only at the downstream end of river system. In a supercritical flow analysis, boundary conditions are required only at the upstream end of river system and in a mixed flow regime boundary conditions are provided at the open ends of the river system. 5.1.3 Dam Breach Parameters The shape of the peak breach outflow hydrograph is influenced by the storage in the impoundment at the time of breach, reservoir inflow at the time of breach, size of the dam, and most importantly, the dam type’s erodibility and mode of assumed failure. For instance, a brittle concrete or structural failure will have a much faster time of breach development as compared to an overtopping failure of a large, cohesive, well compacted, and well vegetated embankment. Since the outflow hydrograph can vary widely depending upon these factors, careful consideration of the dam breach parameters is needed. 5.1.4 Reservoir Data To predict the flood hydrograph from the reservoir, it is necessary to have elevation- storage relationship for the reservoir. 5.1.5 Catchment Hydrology Inflow into the reservoir, reservoir condition at the time of failure and base flow conditions in the river valley downstream may combine to have a significant effect on the predicted flood conditions, depending on the size and nature of the reservoir and dam 5.1.6 Topographic Data Topographic data representing the whole area potentially liable to flooding is required. The extent of this data should not be underestimated. Floods resulting from dam failure can be significantly larger than natural floods. Required topographic data will therefore extend widely across floodplains and up-valley slopes well above normal flood levels. Details of major structures that may form an obstruction to flow are also required, such as road and railway embankments and bridges and-major river control structures. The accuracy of a dam break study is different from that of a river modelling study. Traditional river modelling simulates natural floods that occur within defined floodplain areas. Our knowledge of typical flow conditions and modelling parameters such as channel and floodplain roughness for these events is relatively good. For a dam break model the flow conditions typically exceed natural events by a large margin meaning that there is little calibration data and the flooded terrain is outside of the normal floodplain areas making the estimation of channel roughness difficult. 5.1.7 Boundary Conditions In this analysis, upstream boundary condition provided is flow hydrograph and downstream boundary condition is normal depth. This option uses Manning’s equation to estimate a stage for each computed flow. To use this method, the user is required to enter a friction slope for the reach in the vicinity of the boundary condition. Rating curve is the other option which is used as downstream boundary condition. Lateral inflow hydrograph is used as internal boundary condition. This option allows the user to bring in flow at a specific point along the stream. 5.2 Results The graphics include X- Y plots of the river system, schematic cross sections, profiles, rating curves, hydrographs, and many other hydraulic variables. The standard output table consists of river station, total, minimum channel elevation, maximum water surface elevation, critical water surface elevation, energy gradient slope, top width, Froude number and velocity of channel. User can create table with additional variables. 5.3 Analysis of Idukki arch dam 5.3.1 Input for Idukki Arch Dam 1) Manning’s ‘n’= 0.04 2) Left of bank = 654m 3) Right of bank = 655m 4)Expansion and contraction coefficient = 0.1 and 0.3 respectively
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3413 0 100 200 300 400 500 600 700 580 600 620 640 660 680 700 720 740 50987 Station (m) Legend WS Max WS Ground Fig -1: Cross section at 5023m away from Dam 0 200 400 600 800 10001200140016001800 500 520 540 560 580 600 43545 Station (m) Legend WS Max WS Ground 0 2 4 6 8 10 12 200 0 400 0 800 0 120 00 140 00 River: Periyar RS:Downstream Time (hours) Flow (m3/s) Legen Flo 20 60 80 Table -1: Cross Sectional Details Reach Station Elevation Reach 1 0 654 75 640 150 623 225 612 300 606 375 604 455 605 525 612 600 629 685 655 5.3.2 Output of Analysis River valley of 51km was considered for the analysis from Idukki dam to Thattekkad. Cross sections were taken at closer intervals. Fig -1: Cross section at 7442m away from Dam 5.3.3 Flood Hydrograph Maximum flow occurs at downstream after 4 hours of break formation. Then the flow decreases with increase of time. 5.3.4 Output Table Table shows maximum water surface elevation at different locations of downstream of the dam. Column1 shows the sections at which cross section of valley changes abruptly. Column 5 shows the time of arrival of maximum flow in the given sections. Velocity of flow depends on flow area. The maximum flood was found to be 12080.46 cumec which was at end of the valley. River Sta Q Total Min Ch El W.S. Elev Crit W.S. Vel Chnl Froude no. Chl (m3/s) (m) (m) (m) (m/s) 51000 9906 580 640.34 0.52 0.23 50999 9078.24 580 640.34 586.6 0.52 0.23 50998 Inl Struct 50987 8027.29 580 638.24 9.35 0.05 50800 7406.1 580 638.28 9.23 0.02 50500 5594.72 580 638.29 9.12 0.01 50212 3645.42 580 638.28 9.0 0.01 49862 1835.07 580 638.27 8.88 0.23 49422 1312.72 580 621.18 8.72 0.54 48712 1438.77 580 608.06 8.56 0.01 40 100 00
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3414 48429 5205.44 580 608.37 8.43 0.02 47749 7309.24 580 611.06 7.96 0.03 46955 1695.95 580 603.23 7.80 0.01 46515 2042.38 580 597.03 7.62 0.01 45997 3004.51 540 567.29 7.40 0.07 45655 6874.11 540 554.74 7.02 0.09 45246 1211.33 520 541.38 6.76 0.3 44295 8773.1 500 522.79 5.97 0.1 43885 920.96 500 514.06 5.85 0.01 43545 7197.59 500 525.32 5.45 0.03 42981 412.41 440 478.84 5.32 0.22 41691 10345.44 380 393.37 4.87 0.09 41001 1271.86 360 363.84 4.67 0.03 40301 822.52 340 354.97 4.67 0.13 39801 1108.17 340 348.13 4.65 0.01 39300 928.72 320 332.61 4.63 0.11 38800 775.3 320 326.47 4.62 0.01 37720 998.17 300 306.31 4.60 0.01 37220 1124.71 260 266.95 4.57 0.01 36220 1407.11 260 266.65 4.54 0.06 35620 936.38 260 269.17 4.53 0.07 34810 2598.71 260 266.14 4.49 0.62 33290 8084.51 240 261.55 4.46 0.63 32820 2175.94 220 231.91 4.42 0.09 31520 6840.37 220 229.82 4.40 0.08 30680 5908.55 200 245.07 4.34 0.07 30360 1413.07 200 222.47 4.18 0.01 29700 4210.38 200 214.11 4.09 0.46 28850 1781.26 200 207.04 4.0 0.09 28550 1133.52 200 209.12 3.94 0.13 27650 1311.21 200 203.95 3.84 0.07 26950 996.95 160 166.74 3.72 0.05 26150 1010.13 140 159.38 3.61 0.02 25550 1299.58 140 159.43 3.43 0.01 24550 1139.85 120 159.47 2.91 0.11 22750 5174.1 120 141.28 2.83 0.11 21750 3979.51 100 127.62 2.65 0.12 20250 4753.11 60 75.31 2.42 0.23 19250 4823.89 55 74.55 2.32 0.11 17450 15368.4 55 75.18 2.28 0.11 16950 12197.8 55 74.66 2.22 0.12 15150 4174.52 55 74.04 2.15 0.03 13650 4063.64 55 73.96 2.09 0.02 12750 3896.33 55 73.94 1.99 0.02 11370 3615.23 55 73.92 1.92 0.02 10720 3480 55 73.91 1.84 0.01 9830 3303.67 55 73.86 1.78 0.05 8180 1957.88 55 73.86 1.74 0.01 7380 1901.37 55 73.88 1.70 0.02 6110 1651.85 55 73.91 1.62 0.01 5650 1122.97 55 73.91 1.57 0.01 4130 1097.91 55 73.92 1.55 0.01 2630 1860.64 55 61.79 1.44 0.03 1130 12256.9 35 54.35 1.37 0.05 730 12082.8 35 54.3 1.32 0.07 0 12080.5 35 53.21 45 1.27 0.28
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 07 | July-2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 3415 6. CONCLUSION Overtopping mode of failure of the structure was considered for the analysis. The parameters of breach selected is reasonable for the dam break flood generation. The peak flow at downstream of river reach is 28345.8 cumecs for Idukki dam. The depth of flow at different location vary from 58.24m (just below Idukki dam site) to18.21m at the end of the reach. Manning’s roughness coefficient (N) was found to be most influencing point in the analysis. The details of water surface elevations, time of arrival of maximum flow at different locations of the valley gives an idea about extent of flooding REFERENCES [1] Doiphode Sanjay L ,Oak Ravindra A, Dynamic Flood Routing and Unsteady Flow Modelling: A case study of Upper Krishna River, International Journal of Advanced Engineering Technology,vol 3,2012,pp 55- 59. [2] P.O. Adewale, A.Y. Sangodoyin, J. Adamowski, flood routing in the ogunpa river in nigeria using hec-ras, Journal of Environmental Hydrology, vol 18,2010,pp 1-11. [3] Sunil Kute, Sayali Kakad, Vrushali Bhoye, Akshada Walunj, Flood modeling of river godavari using hec- ras, International Journal of Research in Engineering and Technology, vol 3,2014,pp81-87 [4] Yi (Frank) Xiong, A Dam Break Analysis Using HEC- RAS, Journal of Water Resource and Protection, vol 3,pp 370-379 [5] D. M. Gee and G. W. Brunner, Dam Break Flood Routing using HEC-RAS and NWS- FLDWAV,Proceeding of Environmental Engineering; Water Resources Management, World Water Congress, 2005. [6] Sunit Deo, Scott M. Muchard, Dam Breach Modeling With Unsteady Hec-Ras: Common Techniques And Assumptions Compared, Innovative Dam and Levee Design and Construction, pp1383-1396 [7] Yongping Yuan , Kamal Qaiser,Floodplain Modeling in the Kansas River Basin Using Hydrologic Engineering Center (HEC) Models ,2011,pp 1-30 [8] Purvang. H. Pandya , Thakor Dixitsinh Jitaji, A Brief Review of Method Available for Dam Break Analysis,indian Journal Of Research, vol 2,2013,pp117-118. [9] U.S . Army Corps of engineers, HEC-RAS River Analysis System, Hydraulic Reference manual, Version 4.0,March 2008 [10] U.S . Army Corps of engineers, Using HEC-RAS for Dam Break Studies BIOGRAPHIES Abhijith R, Assistant Professor to the Dept. of Civil Engineering has done his Master in Technology from NIT Surathkal, Karnataka with specialization in Marine Structures. Amrutha G ,UG Scholar, Dept. of Civil Engineering,a final year student of Viswajyothi college of Engineering and Technology Vazhakhulam. Gopika Vijayaraj ,UG Scholar, Dept. of Civil Engineering , a final year student of Viswajyothi college of Engineering and Technology,Vazhakhulam. Rijisha T V ,UG Scholar, Dept. of Civil Engineering , a final year student of Viswajyothi college of Engineering and Technology Vazhakhulam. Author’s Photo Author’s Photo
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