Rainfall timing and runoff: The influence of the criterion for rain event separation

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Title:Rainfall timing and runoff: The influence of the criterion for rain event separation
Creators:
Molina-Sanchis, Isabel ; imolinasanchis at gmail dot com; Avenue Juegos del Mediterráneo 1, portal 1, 1ªA. El Toyo, Almería 04131, Spain.
Lázaro, Roberto; lazaro at eeza dot csic dot es; Estación Experimental de Zonas Áridas-CSIC, Carretera de Sacramento s/n, 04120 La Cañada de San Urbano, Almería, Spain.
Arnau-Rosalén, Eva ; eva dot arnau at gmail dot com; Department of Geography, University of Valencia, Avenida Blasco Ibañez 28, 46010, Valencia, Spain.
Calvo-Cases, Adolfo ; adolfo dot calvo at uv dot es; Department of Geography, University of Valencia, Avenida Blasco Ibañez 28, 46010, Valencia, Spain.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 64, 3, pp. 226-236
Uncontrolled Keywords:rain events, minimum inter-event time (MIT), runoff, Macrochloa tenacissima (= Stipa tenacissima), semiarid

Abstract

Rain is not uniform in time and space in semiarid areas and its distribution is very important for the runoff process. Hydrological studies usually divide rainfall into events. However, defining rain events is complicated, and rain characteristics vary depending on how the events are delimited. Choosing a minimum inter-event time (MIT) is a commonly used criterion. Our hypothesis is that there will be an optimal MIT that explains the maximum part of the variance of the runoff, with time to runoff used as a surrogate. The objective is to establish a procedure in order to decide upon this optimal MIT. We developed regressions between time to runoff (T0) and three descriptive variables of rain. Our results show that the optimum MIT is 1 hour, which seems to be the minimum period of time required for water in larger macropores to drain and sufficiently modify the effect of antecedent soil moisture on the runoff generation process. Rain events are classified into three significantly different groups: (1) large and intense rains, (2) light rains on wet soil, and (3) light rains on dry soil. Intense rains produce most of the runoff, but there were significant differences between small events in the runoff generated. Of rain events, 63.75% are single-tip events, and many could be dew.

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Title:Rainfall timing and runoff: The influence of the criterion for rain event separation
Translated title:Rainfall timing and runoff: The influence of the criterion for rain event separation
Creators:
Molina-Sanchis, Isabel ; imolinasanchis at gmail dot com; Avenue Juegos del Mediterráneo 1, portal 1, 1ªA. El Toyo, Almería 04131, Spain.
Lázaro, Roberto; lazaro at eeza dot csic dot es; Estación Experimental de Zonas Áridas-CSIC, Carretera de Sacramento s/n, 04120 La Cañada de San Urbano, Almería, Spain.
Arnau-Rosalén, Eva ; eva dot arnau at gmail dot com; Department of Geography, University of Valencia, Avenida Blasco Ibañez 28, 46010, Valencia, Spain.
Calvo-Cases, Adolfo ; adolfo dot calvo at uv dot es; Department of Geography, University of Valencia, Avenida Blasco Ibañez 28, 46010, Valencia, Spain.
Uncontrolled Keywords:rain events, minimum inter-event time (MIT), runoff, Macrochloa tenacissima (= Stipa tenacissima), semiarid
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:64
Number:3
Page Range:pp. 226-236
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8664
Item Type:Article
Deposited On:18 Aug 2016 14:26
Last Modified:18 Aug 2016 12:26

Citation

Molina-Sanchis, Isabel; Lázaro, Roberto; Arnau-Rosalén, Eva; Calvo-Cases, Adolfo (2016) Rainfall timing and runoff: The influence of the criterion for rain event separation. Journal of Hydrology and Hydromechanics, 64 (3). pp. 226-236. ISSN 0042-790X

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