Parameterization of a Hydrological Model for a Large, Ungauged Urban Catchment

Gerald Krebs, Teemu Kokkonen, Heikki Setälä, Harri Koivusalo

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)
324 Downloads (Pure)

Abstract

Urbanization leads to the replacement of natural areas by impervious surfaces and affects the catchment hydrological cycle with adverse environmental impacts. Low impact development tools (LID) that mimic hydrological processes of natural areas have been developed and applied to
mitigate these impacts. Hydrological simulations are one possibility to evaluate the LID performance but the associated small-scale processes require a highly spatially distributed and explicit modeling approach. However, detailed data for model development are often not available for large urban areas, hampering the model parameterization. In this paper we propose a methodology to parameterize a hydrological model to a large, ungauged urban area by maintaining at the same time a detailed
surface discretization for direct parameter manipulation for LID simulation and a firm reliance on available data for model conceptualization. Catchment delineation was based on a high-resolution digital elevation model (DEM) and model parameterization relied on a novel model regionalization
approach. The impact of automated delineation and model regionalization on simulation results was evaluated for three monitored study catchments (5.87–12.59 ha). The simulated runoff peak was most sensitive to accurate catchment discretization and calibration, while both the runoff volume and the fit of the hydrograph were less affected.
Original languageEnglish
Article number443
Pages (from-to)1-23
JournalWATER
Volume8
Issue number10
DOIs
Publication statusPublished - 11 Oct 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • SWMM
  • model regionalization
  • DEM delineation
  • ungauged
  • large urban catchment
  • LID

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