Articles | Volume 21, issue 5
Hydrol. Earth Syst. Sci., 21, 2277–2299, 2017
https://doi.org/10.5194/hess-21-2277-2017
Hydrol. Earth Syst. Sci., 21, 2277–2299, 2017
https://doi.org/10.5194/hess-21-2277-2017

Research article 03 May 2017

Research article | 03 May 2017

A synthesis of space–time variability in multicomponent flood response

Yiwen Mei, Xinyi Shen, and Emmanouil N. Anagnostou Yiwen Mei et al.
  • Civil and Environmental Engineering, University of Connecticut, Storrs, CT, USA

Abstract. Catchment flood response consists of multiple components of flow originating from different surface and subsurface layers. This study proposes an extension of Viglione et al. (2010a) analytical framework to represent the dependence of catchment flood response to the different runoff generation processes. The analytical framework is compared to simulations from a distributed hydrologic model. A large number of rainfall–runoff events from three catchments of Tar River basin in North Carolina are used to illustrate the analytical framework. Specifically, the framework is used to estimate three flood event characteristics (cumulative runoff volume, centroid, and spreadness of hydrograph) through three corresponding framework parameters: the rainfall excess and the mean and variance of catchment response time. Results show that, under the smooth topographic setups of the study area, the spatial and/or temporal correlation between rainfall and runoff generation are insignificant to flood response; delay in flood response due to runoff generation and routing are of equal importance; the shape of the flood is mainly controlled by the variability in runoff generation stage but with non-negligible contribution from the runoff routing stage. Sensitivity tests show that the framework's main error source is the systematic underestimation of the flood event's centroid and spreadness, while the random error is relatively low.

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