Process-oriented investigation of snow accumulation, snowmelt and runoff generation in forested sites in Finland

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorKoivusalo, Harri
dc.contributor.departmentDepartment of Civil and Environmental Engineeringen
dc.contributor.departmentRakennus- ja ympäristötekniikan osastofi
dc.contributor.labLaboratory of Water Resourcesen
dc.contributor.labVesitalouden ja vesirakennuksen laboratoriofi
dc.date.accessioned2012-01-24T14:34:12Z
dc.date.available2012-01-24T14:34:12Z
dc.date.issued2003-01-10
dc.description.abstractThis thesis summarises development and application of a hydrological model for simulating forest canopy processes, snow accumulation and melt, soil and ground water interactions, and streamflow routing. A motivation behind the model development is to outline a methodology for predicting the influence of land use changes on catchment hydrological processes. In addition, the development aims at providing linkages from the hydrological model to atmospheric models through implementation of surface energy balance and to water quality models through quantification of runoff components. The work started with comparison of two existing snow energy balance models using meteorological and snow data from Northern Finland. Based on the comparison the more simple of the tested snow parameterisations was modified to improve its performance in terms of snow heat balance simulation. The modified snow model was then coupled with a canopy scheme to account for the influence of forest on snow processes. The combined model was applied to clear-cut and coniferous forest sites in Southern Finland to identify the differences in snow mass and energy fluxes between open and forest. Finally, runoff generation in a forested catchment (Rudbäck, 0.18 km2) was studied by using two different parameterisations. First, the catchment was parameterised as a three-dimensional domain, and secondly, as a vertical two-dimensional hillslope. The models produced similar results in terms of fit against measured daily streamflow, but the computed runoff components were different. Independent calibration of hydrological submodels yielded a more realistic partition of runoff into surface and subsurface components than did calibration merely against streamflow data. It is proposed that the hillslope model can be used to simulate runoff generation in each possibly non-contiguous area that is similar in terms of its land-use. A system where a set of such models is combined together can be used to quantify runoff contributions from pre-classified areas of different land-use, and constitutes a tool for studying hydrological impacts of land use changes.en
dc.description.versionrevieweden
dc.format.extent88, [92]
dc.format.mimetypeapplication/pdf
dc.identifier.isbn951-22-6237-1
dc.identifier.issn1456-2596
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/2038
dc.identifier.urnurn:nbn:fi:tkk-000122
dc.language.isoenen
dc.publisherHelsinki University of Technologyen
dc.publisherTeknillinen korkeakoulufi
dc.relation.haspartKoivusalo, H. and Heikinheimo, M. 1999. Surface energy exchange over a boreal snowpack: comparison of two snow energy balance models, Hydrological Processes, 13, 2395-2408.
dc.relation.haspartKoivusalo, H., Heikinheimo, M. and Karvonen, T. 2001. Test of a simple two-layer parameterisation to simulate the energy balance and temperature of a snowpack, Theoretical and Applied Climatology, 70, 65-79. [article2.pdf] © 2001 Springer-Verlag. By permission.
dc.relation.haspartKoivusalo, H. and Kokkonen, T. 2002. Snow processes in a forest clearing and in a coniferous forest, Journal of Hydrology, 262, 145-164. [article3.pdf] © 2002 Elsevier. By permission.
dc.relation.haspartKoivusalo, H., Karvonen, T. and Lepistö, A. 2000. A quasi-three-dimensional model for predicting rainfall-runoff processes in a forested catchment in southern Finland, Hydrology and Earth System Sciences, 4, 65-78. [article4.pdf] © 2000 European Geosciences Union. By permission.
dc.relation.haspartKoivusalo, H. and Kokkonen, T. Modelling runoff generation in a forested catchment in southern Finland, Hydrological Processes, in press.
dc.relation.ispartofseriesHelsinki University of Technology Water Resources publicationsen
dc.relation.ispartofseries6en
dc.subject.keywordhydrologyen
dc.subject.keywordrunoffen
dc.subject.keywordsnowen
dc.subject.keywordforesten
dc.subject.keywordenergy balanceen
dc.subject.keywordmathematical modelsen
dc.subject.otherEnvironmental scienceen
dc.titleProcess-oriented investigation of snow accumulation, snowmelt and runoff generation in forested sites in Finlanden
dc.typeG5 Artikkeliväitöskirjafi
dc.type.dcmitypetexten
dc.type.ontasotVäitöskirja (artikkeli)fi
dc.type.ontasotDoctoral dissertation (article-based)en
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