Ertan Hydropower Project

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Ertan Ertan Hydropower Project Flood discharge of Ertan Section drawing of Ertan Arch Dam Section drawing of power conduit and power house Ertan Main features Project Location On the Yalong River, Sichuan Project Purpose Hydroelectric Power Generation province, P. R. China Years of 1987-1999 Catchment and Reservoir Construction Catchment Area 116,400km2 Main Dam Mean Annual Runoff 1,670m3/s Type Double-curvature Arch Dam Reservoir Area at FSL 101km2 Height 240m Storage at FSL 5,800 million m3 Crest Length 774.69m Active Storage 3,370 million m3 Power plant Discharge Capacity Maximum gross 189 m Crest Outlet 7 / 6,260 m3/s head Mid Level Outlet 6 / 6,930 m3/s Installed Capacity 3,300 MW Bottom Outlet 4 / 2,084m3/s No. and Capacity 6×550 MW Flood Discharging 2 / 7,400 m3/s of Units Tunnel Power Conduits 6 steel embedded in concrete I.D.=9.0 River Diversion for Construction m First Phase Cofferdam of Left and Right Type of Turbine Francis Diversion Tunnel, Diversion Main Construction Volumes Tunnel Construction Concrete 5,857,000 m3 Second Phase Remove of Diversion Tunnel Excavation 12,638,000 m3 Cofferdam, Closure, Cofferdam of Main Equipment Suppliers Dam Turbines GE Canada, Dongfang Electrical Third Phase Close Diversion Tunnel, Temp Machinery Co, Ltd., Harbin Electric Diversion Bottom Outlet Machinery Co, Ltd. Fourth Phase Close Temp Diversion Bottom Generators & HV GE Canada, Dongfang Electrical Outlet, Ponding Electrical Machinery Co, Ltd., Harbin Electric Project Developers Machinery Co, Ltd. Owner Ertan Hydropower Development Gates & Jiajiang Hydraulic Machinery Works, Company,Ltd. Hydromechanical China Gezhouba (Group) Corporation, Designer CHIDI Sinohydro Bureau No.8, Contractor EJV, SGEJV, GYBD The main project components of Ertan are a concrete double-curvature arch dam (240m high and 775m long) and a huge underground powerhouse complex. Ertan dam is China’s first dam exceeding 200m, and Ertan underground powerhouse complex is the largest one in Asia. The underground complex includes a powerhouse cavern (281m×26m to 31m×66m) with six 550MW units, a transformer cavern (215m×19m×25m) and a surge chamber (201m×19m×69m). The project also has the two large spillway tunnels (13m×13.5m) and a 500m-long bridge, 7 surface spillways and 6 middle outlets. The Project was completed in 2000. General layout of Ertan hydroelectric scheme .

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Supplementary File
Supplementary file: Dam-break flood calculation results and investigation data of the Ertan Hydropower Station We have conducted a detailed study on dam-break calculation of the Ertan Hydropower Station and compiled a report: Analysis report on dam-break flood of the Ertan Hydropower Station. This report contains eight chapters, 280 pages and all written in Chinese, it is difficult to translate all of them. Due to the flooding scenario is a full dam break in our study, we only translated the main content of full dam-break calculation process. 1. Basic equation The evolution of the flood wave downstream is calculated by Saint Venant equation, and the Saint Venant equation is: (1) Where: Q: Discharge at dam site (m3/s); A: Effective cross section area (m2); A0: Area of beach land (m2); x : Distance along the direction of water flow (m); t: Time (s)； q: Lateral inflow or outflow (m3/s); g: Gravity (m/s2) n 2 Q Q f： S Friction ratio drop, S f 4 2.21A2 R 3 kQ / A2 Se：local head loss, S e 2gx h：Water elevation (m); k：Coefficient of contraction. 2. Computational method Presimann's four-point eccentric implicit scheme is used to solve the equations (1) and the values of h and Q can be obtained at any time. Implicit difference equation can be written as: j11 j j j QQQQ 1 j11 j j j i11 i10 i i AAAAAAAA 0i 0 i11 0 i 0 i xi x i 2 t j (2) j1 j1 1 Q 2 Q 2 Q j1 Q j1 Q j Q j 2t i i1 i i1 x A A j i i1 i 2 j 2 j j1 1 j1 j1 j1 j1 1 Q Q (3) g A hi1 hi S f Se x x A A i i i1 i j 1 j j j j g A hi1 hi S f Se 0 xi Where, A Ai Ai1 / 2 2 2 4 3 S f n Q Q 2.21A R Q Q Q 2 i i1 R A B B B B 2 i i1 3.
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