Project aims at creating means to understand physical, chemical and biological processes in the Tonle Sap and to assist in the maintenance of sustainable conditions of the lake. Following advanced hydrological, hydrodynamic, water quality and eutrophication models have been used in the project:
a) for the watersheds
• HBV as a conceptual lumped-parameter model
• VMOD as a physically based distributed-parameter model
b) for the lake and its flood plains
• Three-dimensional (3D) Flow Model for computation of water currents and changes of water levels
• 3D Water Quality Model for computation of transport and interactions of a selected set of water quality indicators.
Three-dimensional (3D) EIA Flow Model and 3D EIA Water Quality Model allow modelling of variables such as water levels and currents, inundation of the flood plains, suspended sediments, and transport and processes of a selected set of water quality indicators and hazardous materials. The flow model can be classified as a 3-dimensional baroclinic z-level model and is based on solving Navier Stokes equations in a rectangular model grid.
The models are coupled with a database which consists of standard GIS-data and versatile meteorological, hydrological, hydrodynamic and water quality measurements. The database and the models are run through a common graphical user interface. The model outputs can be utilized directly e.g. in the standard GIS environment for combination with socio-economic data and further analysis. In this paper, the used in-house and commercial GIS tools for analysis will be compared as well.
Click the image above to view an animation about the sediment concentration in the Tonle Sap Lake during the year 2000 flood.