Browsing by Author "Parikka, Lauri"

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  • Developing and testing of a distributed, process-based hydrological model for urban environments
    (2024-09-15) Parikka, Lauri
     School of Engineering | Master's thesis
    Climate change and urbanization are megatrends affecting both natural areas and human infrastructure worldwide. While adaption measures are implemented all over the Europe, more people remain vulnerable especially due to urban heat island effect and flooding. Distributed process-based hydrological models are powerful tools for managing and planning climate change adaption measures in urban environments. However, connections between the urban and natural areas are complex and the current generation of models often simplify interactions between the governing processes. In addition, application of the models is cumbersome due to the detailed land use and soils in the urban mosaic. The objective of this thesis was to test an automated open-source modelling pipeline developed around STYX. STYX is a distributed, physics-based hydrological model and its key strengths are the interacting descriptions of 1d pipe, 2d surface, 3d subsurface flows along with a more detailed approach to simulate evapotranspiration. The model was applied to the Vallikallio catchment in Espoo, a residential area with a subsurface stormwater network. The STYX model pipeline was used to generate the model and run the simulations utilizing mainly open data. The model was automatically calibrated by comparing the stormwater outflow results to data. The model performance was assessed by comparing the simulated stormwater results to both existing data and results simulated with a pre-existing calibrated SWMM parametrization of the same catchment. STYX was successfully applied to the catchment and the STYX model pipeline was able to automate the process. The STYX discharge outputs where somewhat smaller than results simulated by SWMM but comparable. During the calibration and validation periods, the modelled cumulative stormwater outflow of STYX was 9-10% smaller than the SWMM comparison. In the future, STYX can be utilized in building-scale hydrological modelling to assess effects of land-use and climate changes and mitigation approaches done with nature-based solutions in urban environments.
  • Ruotsin EEC-ratkaisusta käyty poliittinen keskustelu vv. 1970-72
    (1973) Parikka, Lauri
     School of Business | Master's thesis
  • Tarinakarttojen käyttö luontopohjaisten ratkaisujen esittelyssä
    (2022-04-28) Parikka, Lauri
     Insinööritieteiden korkeakoulu | Bachelor's thesis
  • Lääkäreille tarjottavat telemaattiset palvelut
    (1992) Parikka, Lauri
     Helsinki University of Technology | Master's thesis