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Water 2015, 7(2), 438-454; doi:10.3390/w7020438

Comparison of Different Grid Cell Ordering Approaches in a Simplified Inundation Model

1
Hydrotech Division, Taiwan Typhoon and Flood Research Institute, National Applied Research Laboratories, 11F., No. 97, Sec. 1, Roosevelt Rd., Taipei City 10093, Taiwan
2
Department of Geography, National Changhua University of Education, No. 1, Jinde Rd., Changhua City, Changhua County 50007, Taiwan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 1 December 2014 / Accepted: 22 January 2015 / Published: 30 January 2015
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Abstract

This study proposes a simplified model for non-riverine flood routing using a digital elevation model. The model has the advantage of running with only a few types of input, such as topographic data and cumulative rainfall. Given its ease of use, the model is stable and reliable for developing a real-time inundation forecasting system. This model uses two approaches to determine the collection of cells from which flooding is assumed to originate: (1) A traditional “lowest-elevation approach” that assumes flooding originates from the lowest elevations and that is only based on topographic data; and (2) a novel “D-infinity contributing area approach” that assumes flooding originates at the cells toward which the flow moves and that considers in situ topography and upslope information. The flood water is transferred based on the flat-water assumption that the water levels of adjacent cells are equalized. The performance was evaluated by comparing the simulated results with those from a complex inundation model. The simplified model with the lowest elevation assumption has limited applicability in flat areas and did not provide reasonable locations of the source of the flood. The D-infinity approach can improve the simplified inundation model and extend its application in various topographical areas. View Full-Text
Keywords: flooding; simplified inundation model; flat-water assumption, D-infinity contributing area flooding; simplified inundation model; flat-water assumption, D-infinity contributing area
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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MDPI and ACS Style

Yang, T.-H.; Chen, Y.-C.; Chang, Y.-C.; Yang, S.-C.; Ho, J.-Y. Comparison of Different Grid Cell Ordering Approaches in a Simplified Inundation Model. Water 2015, 7, 438-454.

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