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Office fédéral de météorologie et de climatologie MétéoSuisse

CN-MET

Introduction

Main purpose of the CN-MET project (Centrale Nucléaire et METéorologie) is to bring up to date the system delivering weather information necessary to the population safety in case of a nuclear hazard. CN-MET represents the coupling of a specifically adapted measurement network and a predictive tool in the form of a fine grid numerical weather prediction model currently developed at MeteoSwiss (COSMO-2). This new tool, calling upon modern measurement and modeling techniques of the atmosphere, represents a solution which will keep all its relevance for the next decades.

In case of a nuclear accident, the necessary atmospheric data used to calculate the diffusion of a contaminated air mass will be provided by a fine grid numerical model, covering the whole Swiss territory. The new measurement network within CN-MET is directly adapted to provide the best information (initial and boundary conditions, and test measurements) for this model. CN-MET not only ensures the emergency preparedness for the concerned population on a local scale, but also enhances it on a regional scale corresponding to the Swiss Plateau.

 

TECO, 2008

1(03)_Calpini_Switzerland.pdf, 1.5 MB

 

CN-MET Final assessment report, November 2009

CN-MET_final_report_v1 0.pdf, 1.0 MB

 

The measurement network

With the CN-MET project a new measurement network (Figure 1) is being set up which includes:
  • three remote sensing sites measuring wind and temperature profiles within the planetary boundary layer (PBL), located downwind, upwind and in the center of the domain (data examples cf. Figures 2 and 3),
  • surface weather stations from the new SwissMetNet (SMN) network (with additional turbulence measurements) at each of the four nuclear power plants,
  • four SMN boundary layer stations in order to add information on wind and temperature measurement in the PBL, which are integrated in the MeteoSwiss measurement network.

 

The CN-MET measurement network

Figure 1: The CN-MET measurement network, including 3 remote sensing sites (green), 4 SMN stations at the nuclear power plants (blue) and 4 SMN Surface Layer stations (red).

Vertical temperature profiles measured on 18 March 2006 (time step of ca. 90 sec) with a microwave radiometer installed at the Aerological Station in Payerne

Figure 2: Top: Vertical temperature profiles measured on 18 March 2006 (time step of ca. 90 sec) with a microwave radiometer installed at the Aerological Station in Payerne. Bottom: Comparison with the sounding in Payerne at 00, 12 and 24 UTC; red: sounding, blue: radiometer.

Vertical wind profiles (speed and direction) measured on 23 May 2005 (time step of 30 min) with a wind profiler installed at the Aerological Station in Payerne

Figure 3: Vertical wind profiles (speed and direction) measured on 23 May 2005 (time step of 30 min) with a wind profiler installed at the Aerological Station in Payerne. The wind profiler measurements of Payerne are available in real time from the U.K. Metoffice website.

The fine-grid model COSMO-2

As a part of the CN-MET project, a new fine-grid numerical weather prediction model (Figure 4), COSMO-2, is being developed, with the following caracteristics:
  • data assimilation from the above mentioned network for initial conditions, thus offering a complete and coherent image of the state of the atmosphere and its evolution (wind, turbulence, precipitation, etc)
  • providing input data for the dispersion models in operation at the Swiss Federal Nuclear Safety Inspectorate (ENSI; Eidgenössisches Nuklearsicherheitsinspektorat) for short-distance dispersion calculation around the Swiss nuclear power plants
  • providing an 24 hours forecast every 3 hours, with a 10 minutes output time step, for the whole Swiss Plateau
  • providing an emergency mode, activated on demand by the ENSI, with an hourly computation of  a short-range forecast, in order to satisfy the high requirements of a predictive emergency response tool.

 

Example of a simulated wind field displayed with WMO wind barbs.

Figure 4: Example of a simulated wind field on the Swiss Plateau obtained by the new fine grid model COSMO-2 with a horizontal resolution of 2.2 km. Background colour shading according to terrain height in the model.

windfield_large.png, 44 KB

Contacts

  • Bertrand Calpini, CN-MET project leader, MeteoSwiss, Aerological Station, P.O. BOX 316, 1530 Payerne, Switzerland
  • Dominique Ruffieux, responsible for the CN-MET measurement network, MeteoSwiss, Aerological Station, P.O. BOX 316, 1530 Payerne, Switzerland
  • Philippe Steiner, responsible for the development of COSMO-2, MeteoSwiss, Krähbühlstrasse 58, 8044 Zürich, Switzerland
  • Olaf Maier, project management, MeteoSwiss, Aerological Station, P.O. BOX 316, 1530 Payerne, Switzerland
  • Pirmin Kaufmann, CN-MET operating manager, MeteoSwiss, Krähbühlstrasse 58, 8044 Zürich, Switzerland

 

CN-MET Operations

A meteorological system for nuclear emergency response in SwitzerlandCN-MET

COSMO Model

SwissMetNet

ENSI

NEOC

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