USING RAIN RADAR TO ESTIMATE THE SIZE OF FLOOD EVENTS

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Presentation transcript:

USING RAIN RADAR TO ESTIMATE THE SIZE OF FLOOD EVENTS Luke Sutherland-Stacey Weather Radar NZ luke@weatherradar.co.nz Tom Joseph Mott MacDonald Geoff Austin University of Auckland g.Austin@Auckland.ac.nz Ken Williams and Nick Brown, Auckland Healthy Waters

Estimating Flood events with Rain Gauges Resulting ARI estimates are spatially smooth Is there more variability between the rain gauge locations which might better explain observed flooding?

Rainfall Quantification: Observation Systems Metservice Radar Two Radar systems are available in Auckland. NZ Metservice: large permanent radar station UoA: small (including mobile) research radars Significant post processing is required to yield good quality radar data MILSOM, G. et al. Project Storm 2 - A "world class" strategic planning tool. Water New Zealand Conference. 19-21 September, Energy Events Centre, Rotorua 2007. University of Auckland Field Site (20 km range) 100km Range

Radar Data preparation Data handling Binary manufacturer radar data format Polar to GIS coordinate system (NZTM) mapping Automatic QC Ground clutter (hills, buildings and trees) 2nd trip echoes Other R/F transmitters Advection between scans Radar/Rain gauge correction Frame n Frame n+1 Frame n+a (0<a<1)

Post Event Reporting July 2015 Now Auckland Stormwater is investigating the use of Radar for stormwater event analysis. An event July 2015 is the first to be investigated with this method.

Post Event Reporting July 2015 … and big differences between using rain gauges and radar for calculation of ARI statistics. Current Work: Post Event Reporting July 2015 Radar Rain Gauge

Post Event Reporting July 2015 Current Work: Post Event Reporting July 2015 … which can help to explain the location of Requests of Service. Non- habitable RFS Habitable RFS

Post Event Reporting July 2015 Current Work: Post Event Reporting July 2015 … which can help to explain the location of Requests of Service. Non- habitable RFS Habitable RFS

Post Event Reporting July 2015 … and highlights differences between using rain gauges and radar for calculation of ARI statistics… Current Work: Post Event Reporting July 2015 Radar

Where to from here? Operational use of radar data planned. (H2KnowHow interface) 1 hours Radar Nowcasts for operational stormwater management

Where to from here? Operational use of radar data planned. (H2nOw-How interface) 1 hours Radar Nowcasts for operational stormwater management