Assimilation of Observed Soil Moisture Data in Storm Rainfall-Runoff Modeling
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 2
Abstract
Estimation of antecedent wetness conditions is one of the most important aspects of storm rainfall-runoff modeling. This study investigated the use of observations of near-surface soil moisture carried out in a small experimental plot to estimate wetness conditions of five nested catchments, from 13 to in area, in Central Italy, including the plot itself. In particular, the relationship between the observed degree of saturation, , and the potential maximum retention parameter, , of the soil conservation service-curve number (SCS-CN) method for abstraction was investigated using 15 rainfall-runoff events (ten for calibration and five for verification) that occurred in the period 2002–2005. Two antecedent precipitation indices (API) and one base flow index (BFI) were also considered for the estimation of wetness conditions. When interpreting as the mean soil water deficit of the catchment, an inverse linear relationship with was found with the coefficient of determination decreasing with catchment area, but still significant for the largest catchment. On the contrary, the reliability of regression increased with catchment area when BFI was employed. Both API indices led to poor results for all investigated catchments. The accuracy of the modified SCS-CN method, i.e., incorporating for the estimation of , coupled with a geomorphological unit hydrograph transfer function, was tested in simulating the catchment response. Assimilating the observed soil moisture in the rainfall-runoff model, both the runoff volume and the peak discharge were well predicted with average Nash–Sutcliffe efficiency greater than 90% in the verification phase.
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Acknowledgments
The writers wish to thank B. Bani and R. Rosi for their assistance. This work was funded by the National Research Council of Italy.
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Published In
Journal of Hydrologic Engineering
Volume 14 • Issue 2 • February 2009
Pages: 153 - 165
Copyright
© 2009 ASCE.
History
Received: Aug 29, 2007
Accepted: Apr 30, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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