Mapping Dependence Between Extreme Rainfall and Storm Surge

Journal of Geophysical Research: Oceans - Tập 123 Số 4 - Trang 2461-2474 - 2018
Wenyan Wu1,2, Kathleen L. McInnes3, Julian O’Grady3, Ron Hoeke3, Michael Leonard2, Seth Westra2
1Department of Infrastructure University of Melbourne Melbourne Vic Australia
2School of Civil, Environmental and Mining Engineering University of Adelaide Adelaide SA Australia
3Commonwealth Scientific and Industrial Research Organisation, Marine and Atmospheric Research Aspendale Vic Australia

Tóm tắt

AbstractDependence between extreme storm surge and rainfall can have significant implications for flood risk in coastal and estuarine regions. To supplement limited observational records, we use reanalysis surge data from a hydrodynamic model as the basis for dependence mapping, providing information at a resolution of approximately 30 km along the Australian coastline. We evaluated this approach by comparing the dependence estimates from modeled surge to that calculated using historical surge records from 79 tide gauges around Australia. The results show reasonable agreement between the two sets of dependence values, with the exception of lower seasonal variation in the modeled dependence values compared to the observed data, especially at locations where there are multiple processes driving extreme storm surge. This is due to the combined impact of local bathymetry as well as the resolution of the hydrodynamic model and its meteorological inputs. Meteorological drivers were also investigated for different combinations of extreme rainfall and surge—namely rain‐only, surge‐only, and coincident extremes—finding that different synoptic patterns are responsible for each combination. The ability to supplement observational records with high‐resolution modeled surge data enables a much more precise quantification of dependence along the coastline, strengthening the physical basis for assessments of flood risk in coastal regions.

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Journal of Geophysical Research: Oceans

Tập 123 Số 4

2461-2474

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