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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Through-water terrestrial laser scanning of gravel beds at the patch scale
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Through-water terrestrial laser scanning of gravel beds at the patch scale

机译：补丁规模的砾石层水上地面激光扫描

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摘要

Acquiring high resolution topographic data of natural gravel surfaces is technically demanding in locations where the bed is not exposed at low water stages. Often the most geomorphologically active surfaces are permanently submerged. Gravel beds are spatially variable and measurement of their detailed structure and particle sizes is essential for understanding the interaction of bed roughness with near-bed flow hydraulics, sediment entrainment, transport and deposition processes, as well as providing insights into the ecological responses to these processes. This paper presents patch-scale laboratory and field experiments to demonstrate that through-water terrestrial laser scanning (TLS) has the potential to provide high resolution digital elevation models of submerged gravel beds with enough detail to depict individual grains and small-scale forms. The resulting point cloud data requires correction for refraction before registration. Preliminary validation shows that patch-scale TLS through 200mm of water introduces a mean error of less than 5mm under ideal conditions. Point precision is not adversely affected by the water column. The resulting DEMs can be embedded seamlessly within larger sub-aerial reach-scale surveys and can be acquired alongside flow measurements to examine the effects of three-dimensional surface geometry on turbulent flow fields and their interaction with instream ecology dynamics.
机译：从技术上讲，在低水位条件下不暴露岩床的地方，要求获得天然砾石表面的高分辨率地形数据。通常，最活跃地貌的表面被永久淹没。砾石床在空间上是可变的，测量其详细的结构和粒径对于了解床粗糙度与近床水力水力，泥沙夹带，运输和沉积过程之间的相互作用以及提供对这些过程的生态响应的见解至关重要。本文介绍了斑块规模的实验室和野外实验，以证明通过水下陆地激光扫描（TLS）可以提供淹没砾石床的高分辨率数字高程模型，该模型具有足够的细节来描述单个颗粒和小规模形式。生成的点云数据需要在配准之前对折射进行校正。初步验证表明，在理想条件下，穿过200毫米水的斑块级TLS引入的平均误差小于5毫米。水柱不会对点精度产生不利影响。生成的DEM可以无缝地嵌入到较大的空中航向规模调查中，并且可以与流量测量同时获取，以检查三维表面几何形状对湍流场的影响以及它们与河流生态动力学的相互作用。

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