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This paper describes the application of hydrodynamic modelling in conjunction with remote sensing to estimate flood inundation and discharge in a sparsely monitored and topographically complex tropical catchment in Western Australia. The hydrodynamic modelling was performed using the MIKE 21 model which is a fully dynamic two-dimensional flow model. We used a Shuttle Radar Topographic Mission (SRTM) derived 30 m digital elevation model (DEM), following drainage enforcement and removal of vegetation to reproduce floodplain topography and stream networks in the model. Laser altimetry derived fine resolution elevation data were used at a number of locations to improve the resolution of key features within the topographic model. Surface roughness parameters were estimated based on a grid based land use map which was developed using a combination of DEM, aerial photos, topographic mapping and Google Earth imagery. The model was calibrated using a combination of gauge water heights and remotely sensed inundation extent maps. The inundation maps were derived using MODIS (Moderate Resolution Image Spectrometer) and AMSR-E (Advanced Microwave Scanning Radiometer for EOS) Satellite image of daily frequency. These water extent maps were combined with SRTM derived 30 m DEM to obtain estimates of inundation depths across the floodplain. Discharges for flood event in 2002 were computed at several locations on the Fitzroy River using the hydrodynamic model and compared with the gauge records (where available). Results shows gauge records could be over predicted at some locations. However, we are still testing the model for improved calibration and results are inclusive before the completion of final calibration. The method described in this study would help to address the problem of data deficiency in calibrating hydrodynamic models and provides improved estimates of flood discharge. It is intended that this model will be used to investigate the hydrological connectivity of wetlands on the Fitzroy River floodplain and to estimate groundwater recharge to the lower Fitzroy River alluvial aquifers.

The use of hydrodynamic modelling and remote sensing to estimate floodplain inundation and flood discharge in a large tropical catchment