Chen, Shangzhi

Dellinger, G.

Finaud-Guyot, P.

Garambois, P.-A.

Ghenaim, Abdallah

Terfous, Abdelali

English

Hydraulic Engineering Repository

Conference Paper, Published VersionChen, Shangzhi; Garambois, P.-A.; Finaud-Guyot, P.; Dellinger, G.;Terfous, Abdelali; Ghenaim, AbdallahSensitivity analysis of urban flood flows to hydrauliccontrolsZur Verfügung gestellt in Kooperation mit/Provided in Cooperation with:TELEMAC-MASCARET Core GroupVerfügbar unter/Available at: https://hdl.handle.net/20.500.11970/104493Vorgeschlagene Zitierweise/Suggested citation:Chen, Shangzhi; Garambois, P.-A.; Finaud-Guyot, P.; Dellinger, G.; Terfous, Abdelali;Ghenaim, Abdallah (2017): Sensitivity analysis of urban flood flows to hydraulic controls. In:Dorfmann, Clemens; Zenz, Gerald (Hg.): Proceedings of the XXIVth TELEMAC-MASCARETUser Conference, 17 to 20 October 2017, Graz University of Technology, Austria. Graz: GrazUniversity of Technology. S. 119-119.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.Sensitivity analysis of urban flood flows to hydraulic controls  Shangzhi Chen1, P.-A.Garambois1, P. Finaud-Guyot2, G. Dellinger2, Abdelali Terfous1, Abdallah Ghenaim1 1ICUBE-UMR 7357, fluid mechanics team, INSA Strasbourg, 24 Boulevard de la Victoire, 67084 Strasbourg cedex, France 2ICUBE-UMR 7357, ENGEES, fluid mechanics team, 2 rue Boussingault, 67000 Strasbourg cedex, France shangzhi.chen@insa-strasbourg.fr   Abstract: Flooding represents one of the most significant natural hazards on each continent and particularly in highly populated areas. Improving the accuracy and robustness of prediction systems has become a priority. However, in situ measurements of floods remain difficult while a better understanding of flood flow spatiotemporal dynamics along with dataset for model validations appear essential. The present contribution is based on a unique experimental device at the scale 1/200, able to produce urban flooding with flows corresponding to frequent to rare return periods. The influence of 1D Saint Venant and 2D Shallow water model (Telemac2D) input parameters on simulated flows is assessed using global sensitivity analysis (GSA). The tested parameters are: global and local boundary conditions (water heights and discharge) and spatially uniform or distributed friction coefficient tested around their calibrated values thanks to accurate experimental data and related uncertainties, where the outputs of interest are spatially distributed water height and outlet discharge. For various experimental configurations a variance decomposition method (ANOVA) is used spatially to calculate distributed Sobol' sensitivity indices (Si's). The sensitivity of water depth and discharge to input parameters on the whole experimental device is presented here. Results show that the closer from the downstream boundary condition on water height, the higher the Sobol' index as predicted by hydraulic theory for subcritical flow, while interestingly the sensitivity to friction decreases. The sensitivity indices of all lateral inflows representing crossroads in 1D are also quantified in this study along with their asymptotic trends along flow distance. The relationship between lateral discharge magnitude and resulting sensitivity index of water depth is investigated. The spatially distributed Sobol’ index in 2D configuration show similar trends as in 1D with except for a sub-critical flow zone where coupling effects between the tested parameters is highlighted. The role of street width and obstruction on discharge distributions is also analyzed using GSA. This methodology could be applied to any urban flood configuration in order to better understand flow dynamics and distribution but also guide model calibration in the light of flow controls. 119

Sensitivity analysis of urban flood flows to hydraulic controls

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Sensitivity analysis of urban flood flows to hydraulic controls

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