Using post-flood surveys and geomorphologic mapping to evaluate hydrological and hydraulic models: The flash flood of the Girona River (Spain) in 2007

JOURNAL OF HYDROLOGY

卷:541

Article

Segura-Beltran, F.¹  Sanchis-Ibor, C.²  Morales-Hernandez, M.³  Gonzalez-Sanchis, M.⁴  Bussi, G.⁵  Ortiz, E.⁶ 

[1] Univ Valencia, Dept Geog, Avda Blasco Ibanez 28, Valencia 46010, Spain

[2] Univ Politecn Valencia, Ctr Valenciano Estudios Riego, E-46022 Valencia, Spain

[3] Univ Zaragoza, CSIC, LIFTEC EINA, Fluid Mech, C Maria de Luna 3, Zaragoza 50018, Spain

[4] Univ Politecn Valencia, Dept Hydraul Engn & Environm, Valencia, Spain

[5] Univ Oxford, Sch Geog & Environm, S Parks Rd, Oxford OX1 3QY, England

[6] Idrol & Ambiente Srl, Via Stazio 66, I-80123 Naples, Italy

关键词: Flash floods;    Hydrological modeling;    Hydraulic modeling;    Alluvial fans;    Post-flood surveys;    Geomorphologic mapping;   

DOI  :  10.1016/j.jhydrol.2016.04.039

来源: Elsevier

【 摘 要 】

This paper analyzes the Girona River (Spain) flash flood, occurred on the 12th of October 2007, combining hydrological and hydraulic modeling with geomorphologic mapping and post-flood survey information. This research aims to reproduce the flood event in order to understand and decipher the flood processes and dynamics on a system of prograding alluvial fans. The hydrological model TETIS was used to characterize the shape and dimension of the October 2007 Girona River hydrograph. Subsequently, the flood event was reproduced using the free surface flow module of the model RiverFlow2D. The combination of hydrological and hydraulic models was evaluated using post-flood surveys defining maximum flooded area and flood depths. Then, simulations with different peak discharges were carried out to estimate the hydro-geomorphologic response of the Girona River floodplain, through the identification of the activation thresholds in different geomorphic elements. Results showed that the unit peak discharge of the October 2007 flood event (5 m(3) s(-1) km(-2)) was among the largest ever recorded in the area, according to the existing literature. Likewise, the hydraulic model showed a good performance in reproducing the flood event (Fit(A) = 76%, RMSE = 0.65 m and NSE = 0.6), despite the complexity of the case, an ephemeral and ungauged river. The model simulation revealed the existence of an activation pattern of paleochannels and alluvial fans, which was altered by the presence of some anthropogenic disturbances. This multidisciplinary approach proved to be a useful strategy for understanding flash flood processes in ungauged catchments. It allowed understanding the mechanisms governing floods in alluvial fans systems and it represented a solid contribution for early warning plans and risk mitigation policies. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free