Representing hydrodynamically important blocking features in coastal or riverine lidar topography
Representing hydrodynamically important blocking features in coastal or riverine lidar topography
复制标题
代表沿海或河流激光雷达地形中流体动力学上重要的阻塞特征
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Hodges
中科院分区：
文献类型：
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作者：
B. Hodges
抽象的。新的自动化方法被开发出来，用于识别导致水动力阻塞的狭窄景观特征，并可能对河流洪水、沿海洪水、气候变化或极端事件分析的管理模型产生关键影响。处理成高分辨率栅格 (1 m × 1 m) 的激光雷达数据可以解决地形中的窄块特征，但通常不能直接用于流体动力学建模。对于实际应用，此类数据被提取到更大的尺度，这可能导致流体动力学阻塞效应的损失。解决流体动力学阻塞特征的传统方法是将它们表示为根据空间特征调整的定制非结构化网格内的单元边界。开发了一种新的自动边缘阻塞方法，该方法允许在较粗的尺度上应用任意结构化（笛卡尔）网格，并提供沿笛卡尔单元边界的阻塞特征的连续表示。这种方法扭曲了阻挡特征的形状（即，使其沿着网格单元面呈直线），但保留了地形模型内的关键流体动力学阻挡高度特征和空间连续性。
Abstract. New automated methods are developed for identifying narrow landscape features that cause hydrodynamic blocking and might have critical impacts for management models of river flooding, coastal inundation, climate change, or extreme event analysis. Lidar data processed into a fine-resolution raster (1 m × 1 m) can resolve narrow blocking features in topography but typically cannot be directly used for hydrodynamic modeling. For practical applications such data are abstracted to larger scales, which can result in a loss of hydrodynamic blocking effects. The traditional approach to resolving hydrodynamic blocking features is to represent them as cell boundaries within a customized unstructured grid that is tuned to the spatial features. A new automated edge-blocking approach is developed, which allows application of an arbitrarily structured (Cartesian) mesh at coarser scales and provides contiguous representation of blocking features along Cartesian cell boundaries. This approach distorts the shape of a blocking feature (i.e., making it rectilinear along grid cell faces) but retains its critical hydrodynamic blocking height characteristics and spatial continuity within the topographic model.