Assessment of Suitability of WEAP for Studies of the Flood Dampening Effects of Reservoirs in Norway
Abstract
Flom er en stor fare over hele verden. Det ødelegger både mennesker og dyr og egenskaper. Mange flomreduserende alternativer har blitt grepet inn for å minimere disse skadene. Reservoarer er konstruert for en rekke faktorer; vanning, vannforsyning, kraftproduksjon samt flomkontroll. Norge er et land som produserer kraft hovedsakelig fra regulerte vannkraftsystemer. Det blir interessant å se hvordan flomdemping oppstår i et regulert vassdrag. I denne forskningen ble Nea River-bassenget valgt for å analysere demping av flom fra reservoarer. WEAP (Water Evaluation and Planning) programvare ble brukt til å bygge opp og kalibrere den hydrologiske modellen for uregulerte forhold og analysere flomdemping ved å sammenligne den med de regulerte strømmene. Et tilstøtende uregulert Garbergelva-basseng ble valgt for å sette opp WEAP-modellen. De kalibrerte klimaparametrene ble overført til Nea-modellen og modellen ble bygget for uregulert tilstand. Den ble kalibrert ved Stokke målestasjon (1958-1965) og modell ble kjørt på Kulset bru stasjon og sammenlignet resultatene med observert utslipp. WEAP ble vurdert for å bestemme egnetheten for flomdempende studier i norske klimaforhold. Flooding is a major hazard all over the world. It devastates both human and animal beings and properties. Many flood mitigation options have been intervened to minimize these damages. Reservoirs are constructed for a variety of factors; irrigation, water supply, power generation as well as flood control. Norway is a country that generates power mainly from regulated hydropower systems. It will be interesting to see how flood dampening occurs in a regulated river basin. In this research, the Nea River basin was selected to analyse the dampening of floods by reservoirs. WEAP (Water Evaluation and Planning) software was used to build up and calibrate the hydrological model for unregulated conditions and analyse flood dampening by comparing it with the regulated flows. An adjacent unregulated Garbergelva basin was selected to set up the WEAP model. The calibrated climate parameters were transferred to the Nea model and model was built for unregulated state. It was calibrated at Stokke gauging station (1958-1965) and model was run at Kulset bru station and compared the results with observed discharge. WEAP was assessed to determine the suitability for flood dampening studies in Norwegian climate conditions.