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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >TerEx Toolbox for semi-automated selection of fluvial terrace and floodplain features from lidar
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TerEx Toolbox for semi-automated selection of fluvial terrace and floodplain features from lidar

机译：TerEx Toolbox用于从激光雷达半自动选择河流阶地和洪泛区特征

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摘要

Terraces and floodplains are important indicators of near-channel sediment dynamics, serving as potential sediment sources and sinks. Increasing availability of high resolution topography data over large areas calls for development of semi-automated techniques for identification and measurement of these features. In this study we introduce a novel tool that accommodates user-defined parameters including, a local-relief threshold selected by a variable-size moving window, minimum area threshold, and maximum distance from the channel to identify and map discrete terrace and floodplain surfaces. Each of the parameters can easily be calibrated for a given watershed or reach. Subsequently, the tool automatically measures planform area, absolute elevation, and height relative to the local river channel for each terrace polygon.We validate the tool in two locations where terrace maps were previously developed via manual digitization from lidar and extensive field mapping campaigns. The tool is also tested on six different types of rivers to provide examples of starting selection parameters, and to test effectiveness of the tool across a wide range of landscapes. Generally, the tool provides a high quality draft map of terrace and floodplain surfaces across the wide range of environmental conditions for which it has been tested. We find that the tool functions best in catchments where the terraces are spatially extensive, with distinct differences between the terrace and floodplain. The most challenging environments for semi-automated terrace and floodplain mapping include steep catchments with dense riparian vegetation, and very small terraces(~10m~2 in areal extent).We then apply the tool to map terraces and floodplains in the Root River watershed, southeastern Minnesota and generate exceedance plots for terrace heights. These plots provide a first pass analysis to indicate the tributaries and reaches of the river where terraces constitute a significant source of sediment.
机译：阶地和洪泛区是近渠道沉积物动力学的重要指标，是潜在的沉积物来源和汇。在大面积上越来越高分辨率的地形数据的可用性要求开发用于识别和测量这些特征的半自动化技术。在这项研究中，我们介绍了一种新颖的工具，可容纳用户定义的参数，包括通过可变大小的移动窗口选择的局部起伏阈值，最小面积阈值以及距通道的最大距离，以识别和绘制离散的梯田和洪泛区表面。每个参数都可以轻松地针对给定的分水岭或范围进行校准。随后，该工具会自动测量每个露台多边形相对于本地河道的平面区域，绝对高程和高度。我们在以前通过激光雷达和广泛的野外制图活动进行手动数字化开发了露台地图的两个位置验证了该工具。该工具还在六种不同类型的河流上进行了测试，以提供起始选择参数的示例，并在广泛的景观中测试该工具的有效性。通常，该工具在经过测试的各种环境条件下都能提供阶地和洪泛区表面的高质量草图。我们发现，该工具在梯田空间广泛的集水区中效果最佳，梯田和洪泛区之间存在明显差异。半自动梯田和洪泛区制图最具挑战性的环境包括陡峭的集水区，密集的河岸植被以及非常小的梯田（面积约为10m〜2）。然后，我们将该工具用于绘制根河流域的梯田和洪泛区，明尼苏达州东南部，并生成梯田高度的超标图。这些图提供了首过分析，以指示阶流构成重要沉积物来源的支流和河段。

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