Estimating watershed-scale storage changes from hourly discharge data in mountainous humid watersheds: toward a new way of dominant process modeling

Syuhei Kobayashi, Yoshiyuki Yokoo
Released: December 05, 2013

Estimating watershed-scale storage changes from hourly discharge data in mountainous humid watersheds: toward a new way of dominant process modeling

Syuhei Kobayashi1), Yoshiyuki Yokoo1) 2)

1) Graduate School of Symbiotic Systems Science, Fukushima University
2) Institute of Environmental Radioactivity, Fukushima University

The present study demonstrates and suggests a methodology for estimating watershed-scale storage changes from hourly discharge data in mountainous watersheds under a humid climate in Japan as the basis for watershed characterizations by combining a hydrograph separation and a storage-discharge formulizing method. Firstly, we separated hydrographs into different sub-components with respect to the time constants of the flow recession periods of the hydrograph by the filter-separation autoregressive method. Then we applied a storage-discharge formulizing method to the relationship between watershed-scale storage and discharge sub-components independently. As the result, we obtained a realistic estimate of annual watershed-scale storage change in the upper Abukuma River watershed. In addition, we compared our methodology with the non-linear reservoir modeling approach to explore the potential for extensive applications such as dominant process modeling, watershed classifications, and practical watershed management.

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Copyright © 2013 Japan Society of Hydrology and Water Resources

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