Author(s): Ozgen-Xian, Ilhan; Kesserwani, Georges; Caviedes-Voullieme, Daniel; Molins, Sergi; Xu, Zexuan; Dwivedi, Dipankar; Moulton, J David; Steefel, Carl I | Abstract: Abstract A wavelet-based local mesh refinement (wLMR) strategy is designed to generate multiresolution and unstructured triangular meshes from real digital elevation model (DEM) data for efficient hydrological simulations at the catchment scale. The wLMR strategy is studied considering slope- and curvature-based refinement criteria to analyze DEM inputs: the slope-based criterion uses bed elevation data as input to the wLMR strategy, whereas the curvature-based criterion feeds the bed slope data into it. The performance of the wLMR meshes generated by these two criteria is compared for hydrological simulations; first, using three analytical tests with the systematic variation in topography types and then by reproducing laboratory- and real-scale case studies. The bed elevation on the wLMR meshes and their simulation results are compared relative to those achieved on the finest uniform mesh. Analytical tests show that the slope- and curvature-based criteria are equally effective with the wLMR strategy, and that it is easier to decide which criterion to take in relation to the (regular) shape of the topography. For the realistic case studies: (i) slope analysis provides a better metric to assess the correlation of a wLMR mesh to the fine uniform mesh and (ii) both criteria predict outlet hydrographs with a close predictive accuracy to that on the uniform mesh, but the curvature-based criterion is found to slightly better capture the channeling patterns of real DEM data.

中文翻译：

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用于降雨-径流模拟的基于小波的局部网格细化

作者（S）：Ozgen-Xian，Ilhan；凯瑟瓦尼，乔治；Caviedes-Voullieme，丹尼尔；莫林斯，塞尔吉；徐泽轩；德维迪，迪潘卡尔；莫尔顿，J大卫；斯蒂菲尔，卡尔我 | 摘要：摘要一种基于小波的局部网格细化 (wLMR) 策略旨在从真实数字高程模型 (DEM) 数据生成多分辨率和非结构化三角形网格，以便在流域尺度上进行有效的水文模拟。研究 wLMR 策略时考虑了基于坡度和曲率的细化标准来分析 DEM 输入：基于坡度的标准使用床高程数据作为 wLMR 策略的输入，而基于曲率的标准将床坡度数据输入其中。将这两个标准生成的 wLMR 网格的性能用于水文模拟；第一的，使用三种分析测试和地形类型的系统变化，然后复制实验室和实际规模的案例研究。将 wLMR 网格上的床高程及其模拟结果与在最精细均匀网格上获得的结果进行比较。分析测试表明，基于斜率和曲率的标准与 wLMR 策略同样有效，并且更容易决定与地形的（规则）形状相关的标准。对于实际案例研究：(i) 斜率分析提供了更好的度量来评估 wLMR 网格与精细均匀网格的相关性，以及 (ii) 两个标准都以与均匀网格上的预测精度接近的预测精度预测出口流量过程线，