Author:
Furey P. R.,Gupta V. K.,Troutman B. M.
Abstract
Abstract. We hypothesize that total hillslope water loss for a rainfall–runoff event is inversely related to a function of a lognormal random variable, based on basin- and point-scale observations taken from the 21 km2 Goodwin Creek Experimental Watershed (GCEW) in Mississippi, USA. A top-down approach is used to develop a new runoff generation model both to test our physical-statistical hypothesis and to provide a method of generating ensembles of runoff from a large number of hillslopes in a basin. The model is based on the assumption that the probability distributions of a runoff/loss ratio have a space–time rescaling property. We test this assumption using streamflow and rainfall data from GCEW. For over 100 rainfall–runoff events, we find that the spatial probability distributions of a runoff/loss ratio can be rescaled to a new distribution that is common to all events. We interpret random within-event differences in runoff/loss ratios in the model to arise from soil moisture spatial variability. Observations of water loss during events in GCEW support this interpretation. Our model preserves water balance in a mean statistical sense and supports our hypothesis. As an example, we use the model to generate ensembles of runoff at a large number of hillslopes for a rainfall–runoff event in GCEW.
Reference50 articles.
1. Achouri, M. and Gifford, G. F.: Spatial and seasonal variability of field measured infiltration rates on a rangeland site in Utah, J. Rangeland Manage., 37, 451–455, 1984.
2. Akaike, H.: A new look at the statistical model identification, IEEE Trans. Automatic Control, 19, 716–723, 1974.
3. Amerman, C. R. and McGuinness, J. L.: Plot and small watershed runoff: Its relation to larger areas, Trans. ASABE, 10, 464–466, 1967.
4. Bell, K. R., Blanchard, B. J., Schmugge, T. J., and Witczak, M. W.: Analysis of surface moisture variations within large-field sites, Water Resour. Res., 16, 796–810, 1980.
5. Blackmarr, W. M. and the Channel and Watershed Processes Research Unit: Documentation of hydrologic, geomorphic, and sediment transport measurements on the Goodwin Creek Experimental Watershed, Northern Mississippi, for the period 1982–1993 – preliminary release, Tech. Rep. 3, Natl. Sediment Lab., Agric. Res. Serv., US Dept. of Agric., Oxford, MS., 1995.
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