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Träfflista för sökning "AMNE:(NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser) srt2:(1980-1989)"

Search: AMNE:(NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser) > (1980-1989)

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11.
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12.
  • Omstedt, Anders, et al. (author)
  • Measured and numerically-simulated autumn cooling in the Bay of Bothnia
  • 1983
  • In: Tellus. Series A, Dynamic meteorology and oceanography. - : Stockholm University Press. - 0280-6495 .- 1600-0870. ; 35A:3, s. 231-240
  • Journal article (peer-reviewed)abstract
    • Vertical temperature profiles are analysed for the case of cooling of brackish sea water around the temperature of maximum density. Field measurements in the Bay of Bothnia cover a period of 52 days, during which the surface water was cooled from 6°C to 1.5°C. A mathematical model, which is based on the conservation equations for momentum, heat and salt in their one-dimensional forms, is presented. The equation of state is linear with respect to salinity and quadratic with respect to temperature. Turbulent exchange coefficients are calculated with a two-equation model of turbulence.The measured temperature profiles clearly demonstrate the importance of both temperature and salinity gradients in the mixed-layer dynamics. The mathematical model describes these and the general development of the temperature profile in a most satisfactory way.
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13.
  • Zhang, Tielin, et al. (author)
  • Temporal patterns and spatial scale of soil water variability in a small humid catchment
  • 1988
  • In: Journal of Hydrology. - : Elsevier BV. - 0022-1694. ; 104:1-4, s. 111-128
  • Journal article (peer-reviewed)abstract
    • Temporal and spatial variability of soil water content on mainly two different scales is visualized by means of correlation analyses. The soil water data were collected at seven sites for a period of about ten years. The spatial variability of soil water in the unsaturated zone is illustrated and discussed from the aspects of interdepth, intersite and temporal changes respectively. The results in terms of the correlation structure show an increase in spatial variability when depth increases. Three soil layers with different patterns of variability are identified: 0-60, 60-140, and 140-240 cm. It is concluded that the mean time series values of the soil water content do not differ significantly within horizontal distances of about 10-20m. For distances of about 1100m this variation may be more than 5% by volume in absolute values. Higher spatial variability is noted during the summer period (May-September).
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  • Result 11-13 of 13

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