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Estimation of areal precipitation for runoff modelling using wind data: a case study in Sweden
SMHI, Affärsverksamhet.
2005 (Engelska)Ingår i: Climate Research (CR), ISSN 0936-577X, E-ISSN 1616-1572, Vol. 29, nr 1, s. 53-61Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In mountainous regions, rainfall distribution is influenced by topography in combination with wind speed and direction. This has implications for estimates of catchment precipitation as input to hydrological models. The objective of this work was to investigate if wind information can be used to improve the accuracy of precipitation estimates, particularly for operational applications. A geostrophic wind, computed from pressure observations, was assumed to represent the airflow at an altitude relevant for precipitation distribution. Interpolated values of precipitation (optimal interpolation) were verified directly against point observations. In some mountainous catchments with low annual evapotranspiration, estimates of long-term mean areal precipitation could be verified through the water balance equation. The effects of the interpolations with and without wind information on the performance of a rainfall-runoff model were also investigated. There were 2 main factors in favour of using wind information in the interpolation: (1) a better description of the seasonal distribution; and (2) a lower sensitivity to reductions in the number of meteorological stations.

Ort, förlag, år, upplaga, sidor
2005. Vol. 29, nr 1, s. 53-61
Nyckelord [en]
areal precipitation, orographic enhancement, interpolation, rainfall-runoff modelling, spatial distribution, airflow, Sweden
Nationell ämneskategori
Oceanografi, hydrologi och vattenresurser
Forskningsämne
Hydrologi
Identifikatorer
URN: urn:nbn:se:smhi:diva-1269DOI: 10.3354/cr029053ISI: 000231971900005OAI: oai:DiVA.org:smhi-1269DiVA, id: diva2:843150
Tillgänglig från: 2015-07-27 Skapad: 2015-05-26 Senast uppdaterad: 2018-01-11Bibliografiskt granskad

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Johansson, Barbro

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