Flödesmodellering i MIKE urban baserad på högupplöst X-bandradardata

In recent years, X-band radar has emerged as a tool to improve the input data to rainfall-runoff modelling in urban catchments thanks to its high spatial and temporal resolution compared to other radars used for precipitation measurements. An X-band radar was installed in a pilot project run by VA SYD and LTH, ten kilometres east of Lund in the southernmost Sweden during July and August 2018. In this master thesis project these data were used as input data to a MIKE urban wastewater pipe system model over Lund, developed to control the inlet flow to Källby WWTP in Lund. The goal of the study was to conclude whether the X-band radar data could provide acceptable flow predictions compared to measured values of the same period. The results showed that the X-band radar data captured flow peaks that the rain gauge misses, that dense rainfall above the radar itself may attenuate the signal and that after low intensity rainfalls the radar data simulated flow peak occurs earlier than the measured. Overall, the radar has a potential to improve modelling results– if proper bias adjustment is obtained and the risk of underestimated flows after a heavy rain is minimized.