PDF · Útgáfa VÍ 2012-006 / 4812 — júní 2012

Rann­sókn­ir á flóð­um íslenskra vatns­falla – Flood-Durati­on-Frequ­ency modell­ing. Applicati­on to ten catch­ments in Nort­hern Iceland

Streamflow data from ten hydrographic station in Northern Iceland are used to develop flood-duration-frequency (QDF) curves, using the so-called continuous converging model. The QDF curves are equivalent to the well known intensity-duration-frequency (IDF) curves used in extreme rainfall modeling, except that they are applied to discharge data which is the variable of interest. QDF curves give a complete description of the flood dynamics of a basin and allow to directly derive the T-year flood peak discharge of any duration D with a unique and straightforward formula. Results obtained so far indicate that the approach adopted in this study looks promising for deriving QDF curves and complement the regional flood frequency analysis at ungauged catchments. The QDF curves will also be useful for deriving extreme flood statistics of any duration D from simulated daily discharge series made with the WaSiM-ETH distributed hydrological modal used at IMO and will thus enhance its usefulness.