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

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Koivusalo, Harri
dc.date.accessioned 2012-01-24T14:34:12Z
dc.date.available 2012-01-24T14:34:12Z
dc.date.issued 2003-01-10
dc.identifier.isbn 951-22-6237-1
dc.identifier.issn 1456-2596
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2038
dc.description.abstract This 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.format.extent 88, [92]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Helsinki University of Technology Water Resources publications en
dc.relation.ispartofseries 6 en
dc.relation.haspart Koivusalo, 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.haspart Koivusalo, 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.haspart Koivusalo, 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.haspart Koivusalo, 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.haspart Koivusalo, H. and Kokkonen, T. Modelling runoff generation in a forested catchment in southern Finland, Hydrological Processes, in press.
dc.subject.other Environmental science en
dc.title Process-oriented investigation of snow accumulation, snowmelt and runoff generation in forested sites in Finland en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Civil and Environmental Engineering en
dc.contributor.department Rakennus- ja ympäristötekniikan osasto fi
dc.subject.keyword hydrology en
dc.subject.keyword runoff en
dc.subject.keyword snow en
dc.subject.keyword forest en
dc.subject.keyword energy balance en
dc.subject.keyword mathematical models en
dc.identifier.urn urn:nbn:fi:tkk-000122
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Water Resources en
dc.contributor.lab Vesitalouden ja vesirakennuksen laboratorio fi
local.aalto.digifolder Aalto_64158
local.aalto.digiauth ask

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