Complex Cascade Dams Operation The Glommen and Laagen Case
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1 Complex Cascade Dams Operation The Glommen and Laagen Case Hans-Christian Udnæs Head of Department Hydrology, Eidsiva
2 About GLB Glommens og Laagens Brukseierforening (GLB) is a Water Management Association for the largest river system in Norway Lillehammer
3 Glomma & Laagen watercourse Catchment area: 42 km 2 13 % of Norway (-2469 masl) 21 reservoirs and 5 diversions Storage capacity: 3 5 mill.m 3 5 hydroelectric powerstations Inst. capacity: 2 5 MW Production: 12 TWh/year Appr. 9 % of Norway
4 GLB main task Regulate the water flow in the rivers Glomma and Laagen, within licensed conditions, in order to maximize energy production (economic outcome) in the hydropower stations. Commersial, but take into account all stakeholders
5 Raudalsvatn jan. 1. apr. 1. jul. 1. okt. Lalm jan. 1. apr. 1. jul. 1. okt Fundin 1. jan. 1. apr. 1. jul. 1. okt. Stai jan. 1. apr. 1. jul. 1. okt Storsjøen Hydrological regimes - usefulness of regulations 2 15 Olstappen 1. jan. 1. apr. 1. jul. 1. okt jan. 1. apr. 1. jul. 1. okt. Losna jan. 1. apr. 1. jul. 1. okt. Mjøsa jan. 1. apr. 1. jul. 1. okt. Elverum jan. 1. apr. 1. jul. 1. okt. Øyeren jan. 1. apr. 1. jul. 1. okt. Effect of regulations and diversions is about 2,5 TWh/yr (~2 % of total production). Additional economic effect caused by variations in electricity price.
6 Requirements for operating the river system Sufficient and reliable observations Weather forecasts Well calibrated hydrological models A river system model to link the sub catchments together and for planning how to operate A model for optimizing the total profit within actual weather forecasts and known restrictions in the river system
7 Sufficient and reliable observations Water level and outflow (reservoirs) Discharge (power plants and hydrological stations) Precipitation, temperature, snow (meteorological stations) Snow (manual measurements) GLB operates ~125 hyd./met. stations with hourly time resolution
8 Weather forecasts Weather forecasts (precip.+temp.) 1 days ahead for specified areas are imported every morning into the hydrological models Temperature Lillehammer ( ) Beyond 1 days historical observations are used
9 Well calibrated hydrological models m3/s Aursunden reservoir Observed precipitation Observed temperature Observed runoff Simulated runoff For each sub catchment a hydrological model is calibrated on historical data to establish the connection between the model input (precipitation and temperature) and output (runoff) With this model runoff can be forecasted based on the meteorological forecast
10 GLB simulates runoff daily for 4 subcatchments using the HBV model Well calibrated hydrological models Sub catchments Regulated Unregulated Main river
11 River system model Schematic representation of the river system model Reservoir (water level, inflow, outflow) Discharge station (river flow) River Diversion Power plant
12 Schematic representation of the river system model River system model - examples Reservoir Lake Aursunden Discharge station power plant Røstefossen Reservoir (water level, inflow, outflow) Discharge station (river flow) River Diversion Power plant
13 River system model Reservoir; Lake Aursunden m3/s Inflow (unregulated) Outflow (regulated) Production capacity m.a.s.l. Water level Limits
14 River system model Discharge station; Røstefossen m3/s Local inflow (unregulated Aursunden Røstefossen) Outflow Aursunden (regulated) Flow Røstefossen Production capacity Røstefossen
15 River system model Restrictions Lake Osen water level Variable limits for water level in reservoirs especially due to leisure activities in summer m3/s Rånåsfoss power plant - capacity Variable capacity in power plants due to upgrading and maintenance Framruste power plant - discharge m3/s Small variations in outflow/production in winter due to ice conditions in the river
16 River system model forecast single module Mm3 Lake Osen Reservoir volume 1 days forecast Forecast/scenarios based on observed weather the last 3 yeras Based on known restrictions, weather forecast for 1 days, and observed weather for the last 3 years, forecasts and plans are prepared daily.
17 River system model forecast for river Glomma downstream all reservoirs m3/s
18 River system model forecast for river Glomma (totals) reservoir volume Mm3 production GWh*1 price kr/mwh
19 THE END Lake Øyeren 1967, a flooding situation hopefully to be avoided in the future due to activities to reduse floods and optimal use of upstream reservoirs
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