Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Hydrol. Earth Syst. Sci., 10, 861-871, 2006
https://doi.org/10.5194/hess-10-861-2006
© Author(s) 2006. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
 
16 Nov 2006
Simplified stochastic soil-moisture models: a look at infiltration
J. R. Rigby and A. Porporato Department of Civil and Environmental Engineering, Duke University, Durham NC, USA
Abstract. A simplified, vertically-averaged model of soil moisture interpreted at the daily time scale and forced by a stochastic process of instantaneous rainfall events is compared with a vertically-averaged model which uses a non-overlapping rectangular pulse rainfall model and a more physically based description of infiltration. The models are compared with respect to the importance of short time-scale (intra-storm) variable infiltration in determining the probabilistic structure of soil-moisture dynamics at the daily time-scale. Differences in approach to infiltration modelling show only minor effects on the probabilistic structure of soil-moisture dynamics as simulated in the two models. The partitioning of losses during a single rainfall event are examined closely and the conditions under which surface-controlled runoff is significant, as a proportion of total losses, are delineated.

Citation: Rigby, J. R. and Porporato, A.: Simplified stochastic soil-moisture models: a look at infiltration, Hydrol. Earth Syst. Sci., 10, 861-871, https://doi.org/10.5194/hess-10-861-2006, 2006.
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