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Volumetric runoff coefficients for experimental rural catchments in the Iberian Peninsula

AuthorsTaguas, E. V.; Giráldez, Juan Vicente ; Gómez Macpherson, H. ; Gómez Calero, José Alfonso ; González Hidalgo, José Carlos; Mateos, Luciano ; Serrano Muela, M. P. ; Zabaleta, Ane
Issue DateApr-2015
CitationEGU General Assembly (2015)
AbstractAnalysis of runoff and peaks therein is essential for designing hydraulic infrastructures and for assessing the hydrological implications of likely scenarios of climate and/or land-use change. Different methods are available to calculate runoff coefficients. For instance, the runoff coefficient of a catchment can be described either as the ratio of total depth of runoff to total depth of rainfall or as the ratio of peak flow to rainfall intensity for the time of concentration (Dhakal et al. 2012). If the first definition is considered, runoff coefficients represent the global effect of different features and states of catchments and its determination requires a suitable analysis according to the objectives pursued (Chow et al., 1988). In this work, rainfall-runoff data and physical attributes from small rural catchments located in the Iberian Peninsula (Portugal and Spain) were examined in order to compare the representative values of runoff coefficients using three different approaches: i) statistical analysis of rainfall-runoff data and their quantiles (Dhakal et al., 2012); ii) probabilistic runoff coefficients from the rank-ordered pairs of observed rainfall-runoff data and their relationships with rainfall depths (Schaake et al., 1967); iii) finally, a multiple linear model based on geomorphological attributes. These catchments exhibit great variety with respect to their natural settings, such as climate, topography and lithology. We present a preliminary analysis of the rainfall-runoff relationships as well as their variability in a com- plex context such as the Iberian Peninsula where contrasted environmental systems coexist. We also discuss reference parameters representing runoff coefficients commonly included into hydrological models. This study is conceived as the first step to explore further working protocols and modeling gaps in a very susceptible area to the climate change such as the Iberian Peninsula′s, where the analysis of runoff coefficients is crucial for designing appropriate decision making tools for water management.
DescriptionTaguas, E. V. et al.-- Trabajo presentado en la EGU General Assembly 2016 (European Geosciences Union), celebrada en Viena del 12 al 17 de abril de 2015.
Appears in Collections:(IPE) Comunicaciones congresos
(IAS) Comunicaciones congresos
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