Description:
This is the bleeding edge of ENVI-met.

This PDF is the running documentation of the recent ENVI-met version. All new things (if not in seperate research docs) are documented here.
Unfortunately it is in German ! If you can read German or if you think you will understand the equations anyhow, have a look at it.

Please note, that it is not revised most of the time. It's just the stuff I write. Please do not complain about typos and so on....

Description:
Up to version 2.5, the popular approach from Deardorff (1978) has been used to calculate the stomata resistance of the a plant.This approach is quite simple and does not take into account many factors that are known to influence the transpiration of the plant. Moreover, the Deardorff approach is based on analyses of the whole canopy rather and has bad performance when looking at a single leaf like in ENVI-met.
The Deardorff approach has been replaced by an up-to-date A-gs Model by Jacobs(1994). This complex model calculates the plants photosynthetic rate on a single leaf scale (A) and relates it to the stomata conductance (gs).

This module is developed in cooperation with INRA Bioclimatologie/ Avignon, France. Work is supported by the Deutscher Akademischer Austauschdienst DAAD in the PROCOPE program.

Description:
The dispersion model for particles have been linked to a new database containing information about different sources. A new section \SOURCES has been added to the .IN file. Model allows changing emission rates for each hour of the day, non-zero deposition sedimentation and detailed calculation of deposition at the soil or plants.

Work on this module is supported by the European Commission in the Project BUGS (EVK4-CT-2000-00041) in the 5th Framework Program.

Description:
As a microscale model, ENVI-met doesn't know anything about mesoscale meteorological effects or general weather dynamics outside its limited spatial region. To simulate specific meteorological conditions, it is necessary to force the model with external data (e.g. atmospheric profiles).

New boundary condition types have been introduced in ENVI-met to link to external data. However, the state of the work is still basic.

This module was initially developed in cooperation with INRA Bioclimatologie/ Avignon, France was enhanced inside the European Commission in the Project BUGS (EVK4-CT-2000-00041) in the 5th Framework Program. and is still not finished

Description:
Up to now, everything is placed on a flat ground surface. For many applications, it is desirable to include additional orography into the model domain. This can be realized by using the so-called terrain-following co-ordinates.

Changing the co-ordinate system is complex, especially the formulation of the wind field equations. The lab is working on the introduction of it, but it still needs lot of work.