Grid-based rainfall-runoff model with radar data as an input (using satellite data and genetic algorithm)

The analysis of influence of rainfall input derived from radar on quality of hydrological models was conducted on a basis of both weather radar and hyetographs data. Weather radar in Katowice covers lowlands, highlands and mountains. Research was carried out in Wis³a catchment up to level gauge Skoczów (Beskid Œl¹ski mountains, catchment area is 296,7 km2, altitude is from 300 to 1220 m). MaxCAPPI and SRI measurement’s methods were applied. Spatial resolution was from 0.5 x 0.5 km up to the mean value for the whole catchment and data resolution was 4 or 8 bites. Both (1) raw data (just after Doppler processing, e.g. clutters elimination) and (2) data corrected due to distance to radar site and shielding caused by the mountains or other obstacles were taken into consideration. Usefulness of different estimation methods of precipitation field was verified by a conceptual hydrological IUH rainfall-runoff model allowing for infiltration processes. Parameters of models were estimated for each pixel separately with time step of one hour. Analysis of agreement of radar and raingauges data and results of catchment runoff simulation was conducted for various methods of radar measurements.