Flood map boundary sensitivity due to combined effects of DEM resolution and roughness in relation to model performance
Flood map boundary sensitivity due to combined effects of DEM resolution and roughness in relation to model performance
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由于 DEM 分辨率和粗糙度与模型性能的综合影响，洪水图边界敏感度
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
S. Anders Brandt
中科院分区：
文献类型：
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作者：
N. J. Lim;S. Anders Brandt
翻译后摘要在理解洪水模型的结果，我们进行了敏感性分析，并评估了不同的数字高程模型（DEM）的分辨率和曼宁的粗糙度的组合如何影响洪水图从二维水力模型。此外，我们分析了如何估计的精度可以进一步影响的性能措施和该地区的地形。DEM和曼宁的各种组合产生了不同的结果，在量化的性能与实际的洪水范围和生成的洪水边界。高分辨率DEM表现更好，更高的曼宁的，而较低的值更好的低分辨率DEM。此外，虽然较低的分辨率DEM（25和50米）收到较高的量化性能，有更多的差异，洪水图和水面高程（WSE）由他们生产。当前模型性能的统计估计器不一定能准确估计DEM分辨率和粗糙度的哪种组合更适合应用于建模。不同的统计估计有不同的假设，这会影响模型的选择。因此，应采用一种更全面的模型选择方法，对统计估计量以及洪水淹没程度的质量给予同等重视。
Abstract In comprehending flood model results, we performed sensitivity analyses and evaluated how different combinations of digital elevation model (DEM) resolution and Manning’s roughness affect flood maps produced from a 2D hydraulic model. Moreover, we analysed how the estimation of accuracy can further be influenced by the performance measure and the area’s topography. Various combinations of DEM and Manning’s produced different results, in terms of quantified performance in relation to actual flood extent and the generated flood boundaries. High-resolution DEMs performed better with higher Manning’s while lower values were better for lower resolution DEMs. Furthermore, although lower resolution DEMs (25 and 50 m) received higher quantified performances, there are more discrepancies in the flood maps and water surface elevations (WSE) produced by them. The current statistical estimators of model performance do not necessarily provide an accurate estimate of which combination of DEM resolution and roughness are more suitable for application to modelling. Different statistical estimates have different assumptions, which can affect the model selection. Therefore, a more holistic approach towards model selection should be adopted that gives equal importance to statistical estimators, as well as the quality of flood inundation extents.
DOI：
10.1080/02626661003683389
发表时间：
2010-01-01
期刊：
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
影响因子：
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作者：
Di Baldassarre, Giuliano;Schumann, Guy;Beven, Keith J.
通讯作者：
Beven, Keith J.