Comparison of Different Grid Cell Ordering Approaches ina Simplified Inundation Model

Water

Yi-Chin Chen¹  Sheng-Chi Yang²  Ya-Chi Chang²  Tsun-Hua Yang²  Jui-Yi Ho² 

[1] Department of Geography, National Changhua University of Education, No. 1, Jinde Rd.,Changhua City, Changhua County 50007, Taiwan;Hydrotech Division, Taiwan Typhoon and Flood Research Institute,National Applied Research Laboratories, 11F., No. 97, Sec. 1, Roosevelt Rd., Taipei City 10093, Taiwan;

关键词: flooding;    simplified inundation model;    flat-water assumption, D-infinity contributing area;   

DOI  :  10.3390/w7020438

来源: DOAJ

【 摘 要 】

This study proposes a simplified model for non-riverine flood routing usinga 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.

【 授权许可】

Unknown