Climate Risk and Short Duration (Sub-hourly) Extreme Rainfall Analysis

Published on by for ClimSystems Ltd

Climate Risk and Short Duration (Sub-hourly) Extreme Rainfall Analysis

To assist our clients to better understand the implications of data and methods to extreme rainfall events analysis we have put together the following matrix and links to more detailed information. After digesting some or all of this information sometimes a quick call is helpful to further refine your specific methodological requirements.

· Proprietary climate change projections based on downscaled sub-hourly to daily GCM/RCM output

· Multiple distributions fitting and testing

· Multiple station/duration regional analysis

· Bootstrapping confidence intervals

· Intensity density function chart generation

· Time series analysis utilities

· High quality outputs for application in future design storm modelling

CLIMsystems developed an innovative hybrid approach to perturb 5 to 15 minute rainfall time series data. The approach better reflects the climate change signal projected in GCMs and RCMs, including extremes, variation and total amount of change in precipitation that can be applied either for a locale or spatially. There are several key factors accommodated in the approach that are important: (1) the method must preserve the extreme precipitation change information in the climate model (perturbed) output, especially the Intensity Duration Frequency (IDF) change characteristics; (2) the changes in non-extreme precipitation Cumulative Distribution Function (CDF) distribution in all quantiles must be retained; and, (3) the changes in annual and monthly precipitation must be retained. The approach devised and applied by CLIMsystems meets these three criteria.

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