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  • Articles  (3)
  • Articles: DFG German National Licenses  (3)
  • Springer  (3)
  • 1985-1989  (3)
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  • Articles  (3)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Numerical studies on cold fronts Part II: Orographic effects on gravity flows (1989)
    Springer
    Meteorology and atmospheric physics 40 (1989), S. 159-169 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary A two-dimensional nonhydrostatic numerical model was used to investigate the behaviour of a cold air gravity current, moving along complex terrain. It is found, that the model with a high horizontal and vertical resolution and with a closure scheme, using the turbulent kinetic energy, is suitable to simulate currents, which have the main features of those found in laboratory experiments. Simulations are presented for different orographic structures (mountain and valley), for varying thermal stratification of the environmental atmosphere (neutral, stable and stable with an elevated inversion) and for different heights of the cold air reservoir. The major effect of a hill on the advance of a gravity current is a reduction of the front speed upstream as well as (even stronger) downstream of the obstacle, where the amount of this decrease depends on thermal stratification. Near surface blocking of the air flow on the windward side occurs for all simulations. However, for small depths of the oncoming cold air, the current cannot surmount the hill and remains on the lee side.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032456
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The wind-induced shaping and migration of an isolated dune: A numerical experiment (1986)
    Springer
    Boundary layer meteorology 36 (1986), S. 319-334 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Numerical experiments are carried out to simulate the development and migration of a barchan dune starting with a conical pile of sand. Such an experiment is done in three steps: (1) computation of the steady-state wind field over and around a barchan using the numerical meso-scale simulation model FITNAH, whereby the horizontal variation of the friction velocity is also calculated; (2) computation of the sand transport using the friction velocity in the transport formula by Lettau and Lettau (1978); (3) computation of the erosion and deposition rates as the divergence of the sand transport, where a special treatment is used for the slip-face of the barchan dune. Adding these rates to the height field leads to a different shape of the dune after a time step δt h . Then this procedure has to be repeated for the next time step δt h . The results are in good agreement with observations: the initial pile of sand develops wings (‘horns’) and a slip-face between them. In addition, flow separation over the lee-side can be simulated. Finally, the tendency to form a barchan in equilibrium is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00118335
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    MESOKLIP (first special observation period): Observations and numerical simulation — A comparison (1986)
    Springer
    Boundary layer meteorology 35 (1986), S. 83-102 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A short outline of the MESOKLIP experiment and the results of its first special observation period (SOP) are given. This experiment was carried out in the Upper-Rhine valley, F.R.G. in September 1979 with the first SOP from 17th 08:00 UTC to 18th 08:00 UTC. After a brief description of the analysis procedure, some observational results are presented. They are mainly concentrated on the channeling in the Upper-Rhine valley, the height of the layer affected increasing during daytime and decreasing at night in more stable conditions. The results of a nonhydrostatic mesoscale simulation model are compared with the measurements. At least qualitative agreement is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117303
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    Paper (German National Licenses)
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