Detailed local weather modelling may be needed to represent the effects of mountains or land / sea temperature differences on the wind; to get the effects of land roughness on the surface wind speed (e.g. during tropical cyclones); to get the extreme minimum or maximum ground temperature (for gas pipeline projects); to give information on the humidity and temperature (for working conditions).
3D animation of hurricane Katrina computed with WRF.
The ground overlay shows the temperature and the streamlines present the wind flow in the hurricane. During the top view the cloud cover is also shown.
Aktis is experienced at applying the WRF model. WRF is a fine scale weather model that can be nested in global weather models to create a refined local model that accounts for the effects of local topography and land and sea temperature on the wind, temperature and precipitation. Aktis has applied WRF to:
Simulate tropical cyclones and determine the effect of land roughness on the corresponding surface winds (U10);
Obtain design wind speeds in a Fjord (and hindcast the corresponding waves using SWAN);
Obtain the ground temperature along a pipeline route and using a local model of the temperature profile in the ground compute the design low temperature for a pipeline;
Obtain the wind speeds in an extensive sand dune area as part of a project to predict sand dune movement;
Show the affect of orographic effects on the wave conditions in a long narrow sea basin;
Establish temperature and humidity statistics on a tropical island to assess whether these were acceptable for working in.
Hindcasting the daily and extreme wind speeds at LNG terminals situated at the foot of high mountains in areas where violent cold downdraughts occur;
Producing design temperature, humidity and precipitation in tropical areas.
Aktis Hydraulics is an independent private company specialised in coastal metocean and vessel response analysis. Aktis Hydraulics provides operational and engineering design advise for environmentally challanging applications based on in-depth knowledge and a variety of numerical modelling techniques.
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