Joint Seminar: X-band rain-radar observations for urban hydrology in Auckland, New Zealand

The uncertainty associated with rain gauge and rain radar measurements of rainfall has been a topic of active research over the last half century. Now, attention is turning to the downstream effects of these measurement errors on connected non-linear systems, for example, the impact of the influence of spatial variability of rainfall on modelling of urban hydrology.

This talk describes an ongoing monitoring and modelling project for urban Strom water catchments in Auckland, New Zealand. High spatial and temporal resolution (~100m/20 sec) rainfall estimates over the inner-city catchments have been obtained with a mobile X-band radar in the winters of 2013 and 2014. Cases have been identified where connective rainfall, poorly observed by the rain gauge network but imaged by the radar, causes a hydraulic response in the sewer. These these transient responses are present in the flow model driven with radar rainfall boundary conditions but missing from the rain-gauge driven model. This lends support to the notion that improvements in hydraulic model calibration and estimation of the Auckland sewer network state should be made possible through improved estimates of the model boundary conditions.




13:30 h


Bundesstr. 55, Room 1528


Luke Sutherland-Stacey, University of Auckland


Katharina Lengfeld

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