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A simple distributed overland and channel routing method for the Time-Area approach to develop direct runoff hydrograph

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009391.(doi:10.13031/2013.29869)
Authors:   YOUNGGU HER, CONRAD D HEATWOLE
Keywords:   time-area, isochrone, distributed modeling, overland routing, channel routing, unit hydrograph, hydrograph, numerical methods.

The time-area approach provides a useful tool to understand runoff mechanisms and to construct hydrographs through its intuitive and inherently distributed concept. Some researchers have applied this approach to develop unit hydrographs (UH) at outlets. However, the UH concept has limitations in application due to assumptions of a uniform distribution of excess rainfall and a constant base time of the direct runoff hydrograph regardless of excess rainfall intensity. Therefore it may not be appropriate to use a UH in distributed hydrologic modeling of spatially varied excess rainfall. A direct method is presented to derive hydrographs from the distributed excess rainfall map using the time-area map (isochrone) without the assumptions of UH.

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