22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Predictive groundwater flood mapping in a lowland karst environment

26 Sep 2019, 12:30
15m
Conference room 2.2 ()

Conference room 2.2

Oral Topic 7 - Karst Hydrogeology Parallel

Speaker

Dr Owen Naughton (Institute of Technology Carlow)

Description

Quantifying the frequency and magnitude of flood events is a key step in the management of flood risks However, the nature of groundwater flooding on the lowland karst limestone plains of Ireland pose significant technical challenges in this respect. These areas are susceptible to groundwater flooding due to the combination of low soil and aquifer storage, high diffusivity and limited surface drainage. A sequence of extreme flood events in the past decade has highlighted the lack of understanding of groundwater flooding as a geohazard, and highlighted the need for greater understanding of the risks posed by groundwater flooding in a changing climate. A novel approach was developed to produce predictive groundwater flood maps for Ireland in line with the 2nd implementation cycle of the EU Floods Directive. A monitoring network of over 50 sites was established during to provide baseline model calibration data. These data were supplemented with water level time series derived from multi-temporal Synthetic Aperture Radar (SAR) imagery for the key 2015/2016 flood event. Hydrological models capable of reproducing groundwater flood behaviour from antecedent rainfall and soil moisture conditions were developed. Models for viable groundwater flooding locations were calibrated on a combination of observed and SAR hydrographs. Using long-term observational and stochastic meteorological series as input, the models have been used to construct long-term hydrological series suitable for extreme value analysis and the generation of predictive groundwater flood extents and maps.

Primary author

Dr Owen Naughton (Institute of Technology Carlow)

Co-authors

Dr Ted McCormack (Geological Survey Ireland) Ms Rebecca Bradford (Tobin Consulting Engineers) Dr Joan Campanya (Geological Survey Ireland)

Presentation Materials

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