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NEA-1617 ZZ-SIESTA.

ZZ SIESTA, Atmospheric Dispersion Experiment over Complex Terrain

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1. NAME OF EXPERIMENT:  SIESTA.
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2. COMPUTERS
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Program name Package id Status Status date
ZZ-SIESTA NEA-1617/01 Tested 12-JAN-2000

Machines used:

Package ID Orig. computer Test computer
NEA-1617/01 DEC VAX 6000 DEC VAX 6000
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3. PURPOSE AND PHENOMENA TESTED

The aim of the project was to obtain knowledge of the general nature of the turbulence, advection and atmospheric dispersion in the two flow regimes parallel to the Swiss Jura ridge, which represent the most frequent wind systems occurring on the Swiss Plain.
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4. METHODS

DESCRIPTION OF THE EXPERIMENTAL SET-UP USED - The atmospheric dispersion process was investigated by carrying out SF6 tracer experiments. The tracer was released about 6m above ground level near the Goesgen meteo tower. Sampling units were placed on ellipses around the release point. Total sampling time was at least one hour. Tracer concentrations were determined after each experiment by gaschromatography.
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7. SPECIAL FEATURES

Because of the uncertainty in the transport direction of the tracer plume, a mobile tracer analyzing system was used.
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9. STATUS
Package ID Status date Status
NEA-1617/01 12-JAN-2000 Screened
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10. REFERENCES
NEA-1617/01, included references:
- E. Sartori and W. Schuler:
  Tracer Experiment Data Sets for the Verification of Local and
  Meso-scale Atmospheric Dispersion Models including Topographic
  Effects
  OECD/NEA Data Bank
- F. Gassmann(EUR), P. Gaglione(JRC), S.E. Gryning (Riso),
  H. Hasenjaeger(JRC), E, Lyck(APL), H. Richner,
  B. Neininger(LAPETH), S. Vogt, P. Thomas (KfK)
"Experimental Investigation of Atmospheric Dispersion over Complex
Terrain in a Prealpine Region (Experiment SIESTA)
EIR-Bericht Nr. 604 (October 1986)
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12. PROGRAMMING LANGUAGE(S) USED

No item found

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14. DESCRIPTION OF EXPERIMENT AND ANALYSIS

To investigate the flow field in the test region, the following measuring setups were used: (1) Three tethered balloon sounding systems to measure temperature, humidity, wind speed and direction; (2) a meteo tower to measure 10-minute averages of wind direction and velocity at two fixed heights; (3) sonic anemometers to measure heat flux, friction velocity, Monin-Obukhov length, and wind speed at the release point and at a certain distance; (4) 2-m masts to measure wind speed and direction continuously. The wind flow system was measured by radar-tracked tetroons.
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15. NAME AND ESTABLISHMENT OF AUTHORS

AUTHOR/ORGANIZER - The project group consisted of the following
institutions:
- Swiss Federal Institute for Reactor Research (EIR)
- Riso National Laboratory, Denmark
- Air Pollution Laboratory of the Danish National Agency of Environmental Protection (APL)
- Joint Research Center, Ispra Establishment, Italy (JRC)
- Institute for Meteorology and Climate Research of Karlsruhe
  University and KfK, Germany (IMK)
- Nuclear Research Center, Karlsruhe, Germany (KfK)
- Laboratory for Atmospheric Physics, ETH Zurich, Switzerland (LAPETH)
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16. MATERIAL AVAILABLE
NEA-1617/01
File name File description Records
ATE0001_01.001 Information file 36
ATE0001_01.002 SF6 - SF6 concentrations (JRC + APL) 2151
ATE0001_01.003 CLB - Constant level balloons (KFK+LAPETH) 11300
ATE0001_01.004 TOPO - Orography 25013
ATE0001_01.005 RISOE- Micrometeorology of Risoe Nat. Lab. 8636
ATE0001_01.006 HASENJ - Micrometeorology of JRC . 27408
ATE0001_01.007 TETHER-Tethered balloons (EIR+LAPETH+RISOE) 10979
ATE0001_01.008 ANETZ-ANETZ stations of Swiss Meteor. Serv. 11278
ATE0001_01.009 FILE8-Meteorological Data from Swiss sites 498
ATE0001_01.010 MIDSOND-Midday soundings from diff. sites 2074
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17. CATEGORIES
  • Y. Integral Experiments Data, Databases, Benchmarks

Keywords: atmosphere, dispersions, experimental data.