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Flash flood hazard maps provide a scientific support to mitigate flash flood\udrisk. The present study develops a practical framework with the help of\udintegrated hydrological and hydrodynamic modelling in order to estimate the\udpotential flash floods. We selected a small pilot catchment which has already\udsuffered from flash floods in the past. This catchment is located in the Nan\udRiver basin, northern Thailand. Reliable meteorological and hydrometric data\udare missing in the catchment. Consequently, the entire upper basin of the\udmain river was modelled with the help of the hydrological modelling system\udPANTA RHEI. In this basin, three monitoring stations are located along the\udmain river. PANTA RHEI was calibrated and validated with the extreme flood\udevents in June 2011 and July 2008, respectively. The results show a good\udagreement with the observed discharge data. In order to create potential\udflash flood scenarios, synthetic rainfall series were derived from temporal\udrainfall patterns based on the radar-rainfall observation and different\udrainfall depths from regional rainfall frequency analysis. The temporal\udrainfall patterns were characterized by catchment-averaged rainfall series\udselected from 13 rainstorms in 2008 and 2011 within the region. For regional\udrainfall frequency analysis, the well-known L-moments approach and related\udcriteria were used to examine extremely climatic homogeneity of the region.\udAccording to the L-moments approach, Generalized Pareto distribution was\udrecognized as the regional frequency distribution. The synthetic rainfall\udseries were fed into the PANTA RHEI model. The simulated results from PANTA\udRHEI were provided to a 2-D hydrodynamic model (MEADFLOW), and various\udsimulations were performed. Results from the integrated modelling framework\udare used in the ongoing study to regionalize and map the spatial distribution\udof flash flood hazards with four levels of flood severities. As an overall\udoutcome, the presented framework can be applied in areas with inadequate\udrunoff records

proceedings of iahs

A framework of integrated hydrological and hydrodynamic models using synthetic rainfall for flash flood hazard mapping of ungauged catchments in tropical zones