Author(s): Linmei Nie; Asgeir Petersen- O. Verleir
Linked Author(s):
Keywords: Urban hydrology; Gauge stations; Data collection; Precipitation
Abstract: This paper provides an overview of urban hydrology monitoring experience in Norway: the state-or-the-art of gauge stations, observation parameters and data state. As an example, temporal distributions of daily precipitation are presented in chronological plots and polar diagrams for selected stations. The annual maximum daily values are also studied to estimate the effect of climate change. In addition, spatial distributions of daily precipitation in Norway are demonstrated by the selected stations. The investigation in this paper shows that most of existing gauge stations in Norway have operated longer than 20 or 30 years, which matches some needs of storm sewer design and practical analysis, but the data series is not long enough for flood frequency analysis of recurrence intervals rarer than 20 or 30 years. Temporal and spatial distribution of precipitation for selected stations illustrates the change of daily precipitation over time and the variation over geographical locations. Considering the national and international challenges, research perspectives in urban hydrology in Norway in the near future should focus on theses aspects: deciding the dimension and pattern of design storms, quantify the effects of climate change in urban areas, and the possible social and economic consequences. In addition, more efforts should be given to the monitoring of snow and snowmelting and their impacts on surface and subsurface runoff should be qualified by advanced numerical models.
Year: 2007