%0 Journal Article
%T Comparison of Different Grid Cell Ordering Approaches in a Simplified Inundation Model
%A Tsun-Hua Yang
%A Yi-Chin Chen
%A Ya-Chi Chang
%A Sheng-Chi Yang
%A Jui-Yi Ho
%J Water
%P 438-454
%D 2015
%I MDPI AG
%R 10.3390/w7020438
%X 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 ˇ°lowest-elevation approachˇ± that assumes flooding originates from the lowest elevations and that is only based on topographic data; and (2) a novel ˇ°D-infinity contributing area approachˇ± 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.
%K flooding
%K simplified inundation model
%K flat-water assumption
%K D-infinity contributing area
%U http://www.mdpi.com/2073-4441/7/2/438