This project is one of several research projects involving the field of Data Model Integration (DMI) at WL-Delft Hydraulics. It is a direct continuation of R&D work conducted by WL-Delft Hydraulics in 2001 and 2002. This research focuses on the integration of optical remote sensing data with (3D) transport model results of Total Suspended Matter (TSM) concentration.
The specific application is for North Sea TSM concentrations for 1998. This project had three main objectives:
1. To generalise the procedure for spatially linking Remote Sensing (pixel) data to model (grid) coordinates.
2. To develop an optimal DMI method for the comparison of optical Remote Sensing data and a North Sea water quality (total suspended matter) model
3. To apply the DMI method for obtaining optimal TSM information products for the North Sea.
A full-year hydrodynamic and suspended sediment calculation for the North Sea was performed using Delft3D (ONL-grid) and by applying historic 1998 meteorological forcing (e.g. fully varying wind and pressure). Post-processing of model results was conducted in order to produce monthly average maps of TSM (mg/L) in the top model layer. Various Goodness of Fit (GoF) methods for comparing the remote sensing and model data were developed and tested. These provide an objective and reproducible means of quantifying the differences.
The project has shown that monthly averaged data from the SeaWiFS satellite provide very useful information on the seasonal evolution of concentration patterns when modelling seasonal distributions of (surface) TSM. Differences between transport- and process-driven patterns and changes become visible. The use of GoF as an extra means of evaluation is useful. It does not replace the visual inspection and analysis, but strengthens certain differences and in this way may trigger and focus the interpretation.
Financed by (a.o.) Ministry of: Transport, Public Affairs and Water Management |
