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Hydrology 2019, 6(1), 12; https://doi.org/10.3390/hydrology6010012

Case Study: Comparative Analysis of Hydrologic Simulations with Areal-Averaging of Moving Rainfall

Department of Civil Engineering, the University of Texas at Arlington, Arlington, TX 76019, USA
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Author to whom correspondence should be addressed.
Received: 27 December 2018 / Revised: 30 January 2019 / Accepted: 31 January 2019 / Published: 31 January 2019
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Abstract

The goal of this investigation is to compare the hydrologic simulations caused by the areal-averaging of dynamic moving rainfall. Two types of synthetic rainfall are developed: spatially varied rainfall (SVR) is the typical input to a distributed model while temporally varied rainfall (TVR) emulates SVR but is spread uniformly over the entire watershed as in the case of a lumped model. This study demonstrates a direct comparison of peak discharge and peak timing generated by synthetic moving storms over idealized rectangular basins and a real watershed. It is found that the difference between the hydrologic responses from SVR and TVR reflects the impact from the areal-averaging of rainfall; the areal-averaging of rainfall for the movement from upstream to downstream over a lumped model can result in underestimated and delayed peak values in comparison to those from a distributed model; the flood peaks from SVR and TVR are found similar when the storm moves from downstream to upstream. The findings of the study suggest that extra cautions are needed for practitioners when evaluating simulated results from distributed and lumped modeling approaches even using the same rainfall information. View Full-Text
Keywords: storm movements; moving storms; hydrologic simulations; areal-averaging rainfall storm movements; moving storms; hydrologic simulations; areal-averaging rainfall
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fang, Z.N.; Shultz, M.J.; Wienhold, K.J.; Zhang, J.; Gao, S. Case Study: Comparative Analysis of Hydrologic Simulations with Areal-Averaging of Moving Rainfall. Hydrology 2019, 6, 12.

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