Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

Chen, Albert S.

Djordjevic, Slobodan

Savic, Dragan A.

English

Hydraulic Engineering Repository

Conference Paper, Published VersionChen, Albert S.; Djordjevic, Slobodan; Savic, Dragan A.Rain Gauge and Radar Rainfall Information for Urban FlashFlood AnalysisZur Verfügung gestellt in Kooperation mit/Provided in Cooperation with:Kuratorium für Forschung im Küsteningenieurwesen (KFKI)Verfügbar unter/Available at: https://hdl.handle.net/20.500.11970/108590Vorgeschlagene Zitierweise/Suggested citation:Chen, Albert S.; Djordjevic, Slobodan; Savic, Dragan A. (2016): Rain Gauge and RadarRainfall Information for Urban Flash Flood Analysis. In: Yu, Pao-Shan; Lo, Wie-Cheng (Hg.):ICHE 2016. Proceedings of the 12th International Conference on Hydroscience &Engineering, November 6-10, 2016, Tainan, Taiwan. Tainan: NCKU.Standardnutzungsbedingungen/Terms of Use:Die Dokumente in HENRY stehen unter der Creative Commons Lizenz CC BY 4.0, sofern keine abweichendenNutzungsbedingungen getroffen wurden. Damit ist sowohl die kommerzielle Nutzung als auch das Teilen, dieWeiterbearbeitung und Speicherung erlaubt. Das Verwenden und das Bearbeiten stehen unter der Bedingung derNamensnennung. Im Einzelfall kann eine restriktivere Lizenz gelten; dann gelten abweichend von den obigenNutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte.Documents in HENRY are made available under the Creative Commons License CC BY 4.0, if no other license isapplicable. Under CC BY 4.0 commercial use and sharing, remixing, transforming, and building upon the materialof the work is permitted. In some cases a different, more restrictive license may apply; if applicable the terms ofthe restrictive license will be binding.Verwertungsrechte: Alle Rechte vorbehalten12th International Conference on Hydroscience & Engineering Hydro-Science & Engineering for Environmental Resilience November 6-10, 2016, Tainan, Taiwan.  Rain Gauge and Radar Rainfall Information for Urban Flash Flood Analysis Albert S. Chen, Slobodan Djordjevic, Dragan A. Savic Centre for Water Systems, University of Exeter    ABSTRACT  Convective storms often lead to intense rainfall concentrated in local areas that overwhelms the drainage capacity and causes flash flooding. Such events are difficult to capture by scattered rain gauges, while the rainfall radar could provide a viable alternative to get the required precipitation information. However, the observations from rain gauges and radar often disagree with each other and efforts have been made to get a better estimation via blending the radar and rain gauge information. In general, the radar rainfall measurements are calibrated with rain gauge observations such that the records of the both datasets are consistent. Nonetheless, the spatiotemporal variations of convective rainfall events are rapid and difficult to capture by sparse rain gauges. In that case, the calibration using the rain gauge data that are outside the track of the rain storm may underestimate the radar rainfall.  The paper presents such a convective event for which the radar observations offered good representation of spatiotemporal pattern of rainfall distributions, but not for the magnitude. The rainfall concentrated in a local area that official rain gauges did not record the event. Fortunately, two additional rain gauges provided extra information such that the rain gauge observations were used to calibrate the radar rainfall estimation.   The rainfall data were then applied to simulate a flash flooding event in Exeter, UK. The spatiotemporal varied rainfall was used as the input to the hydraulic model to reconstruct the flood event via numerical modelling. The constant infiltration rate was used to reflect the capacity of the storm drainage network. The flood modelling results using the non-uniform rainfall showed better agreement to the flood records. Furthermore, the function of drainage network was also found to play a critical role during the event.    

Rain Gauge and Radar Rainfall Information for Urban Flash Flood Analysis

http://henry.baw.de/bitstream/20.500.11970/108590/1/078_ICHE_2016.pdf

Rain Gauge and Radar Rainfall Information for Urban Flash Flood Analysis

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