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  • 1.
    Bergstrand, Marie
    et al.
    SMHI, Core Services.
    Asp, Sara-Sofia
    SMHI, Core Services.
    Lindström, Göran
    SMHI, Research Department, Hydrology.
    Nationwide hydrological statistics for Sweden with high resolution using the hydrological model S-HYPE2014In: HYDROLOGY RESEARCH, ISSN 1998-9563, Vol. 45, no 3, p. 349-356Article in journal (Refereed)
    Abstract [en]

    A first version of nationally covering hydrological statistics for Sweden based on the S-HYPE hydrological model for the period 1961-2010 is described. A key feature of the proposed method is that observed data are used as input wherever such data are available, and the model is used for interpolation in between stations. Short observation records are automatically extended by the use of the model. High flow statistics typically differed by about +/- 10% from observations. The corresponding number for low flow was about +/- 30%. High flow peaks were usually simulated slightly too low whereas low flows were too high. In a relative sense low flows were more uncertain than high flows. The mean flow was relatively certain. The annual maximum values were fitted to a Gumbel distribution, by the method of moments, for each subbasin. Flood statistics were then calculated up to a return period of 50 years. According to a Kolmogorov-Smirnov test, less than 1% of the fitted distributions were rejected. Most rejections occurred in regulated systems, due to difficulties in simulating regulation strategies, but also due to uncertainties in the precipitation input in the mountainous region. Results at small scale are very uncertain. The proposed method is a cost-effective way of calculating hydrological statistics with high spatial resolution.

  • 2.
    Marmefelt, Eleonor
    et al.
    SMHI, Professional Services.
    Sahlberg, Jörgen
    SMHI, Professional Services.
    Bergstrand, Marie
    SMHI, Core Services.
    HOME Vatten i södra Östersjöns vattendistrikt: Integrerat modellsystem för vattenkvalitetsberäkningar2007Report (Other academic)
    Abstract [sv]

    SMHI har utvecklat ett interaktivt modellsystem för vattenkvalitetberäkningar i mark, sjöar, vattendrag och kustvatten, HOME Vatten. Ett av de första områden som systemet implementerades i var Östergötlands skärgård, med tillhörande avrinningsområde. I detta uppdrag har HOME Vatten implementerats i resterande områden i södra Östersjöns vattendistrikt, dvs. i Kalmar, Blekinge, Skåne och Gotlands län. De ingående modellerna i HOME Vatten är HBV-N (TRK) modellen för mark, sjöar och vattendrag samt Kustzonsmodellen för kustvattnen. Atmosfärsdepositionen både på land och i kustområdet beräknas av den atmosfärskemiska MATCH-modellen.HOME Vatten har utvecklats för att vara ett verktyg i svensk vattenförvaltning med speciellt fokus på EUs ramdirektiv för vatten. Modelluppsättningarna i Kalmar och Skåne-Blekinge läns kustvatten har validerats mot tillgängliga mätdata, och visar en god överrensstämmelse med data.I Gotlands län förekommer inget kustvattenkontrollprogram, varför modellen inte har kunnat valideras i detta område.

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