A new algorithm for the automatic extraction of valley floor width
A new algorithm for the automatic extraction of valley floor width
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DOI：
10.1016/j.geomorph.2019.03.015
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发表时间：
2019-06
期刊：
影响因子：
3.9
通讯作者：
Yinjun Zhao;Pengfei Wu;Jiaxu Li;Qing Lin;Yuan Lu
中科院分区：
文献类型：
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作者：
Yinjun Zhao;Pengfei Wu;Jiaxu Li;Qing Lin;Yuan Lu
谷底的宽度在宏观层面上决定了相关河流或溪流的结构和功能。因此，谷底宽度越来越被认为是一个关键参数，并已被用于许多应用（例如，河流分类）。为了支持不同分辨率的数字高程模型（dem），本文提出了一种利用谷壁与谷底之间的坡度断点自动提取U型和v型谷底宽度的算法。该算法包括5个步骤：1)数据预处理，2)提取线性河段，3)提取河段的垂直线，4)圈定谷底轮廓，5)计算谷底宽度。用八个案例研究验证了该算法。计算和测量了谷底轮廓和宽度，结果表明，该算法具有较高的相关系数（CC> 0.88）和确定系数（R2> 0.77），相对偏差低（|RB| < 10%）。该算法在u型谷中比在v型谷中表现得更好。该算法为研究和管理提供了一种快速、廉价的获取谷形信息的工具。
The width of the valley floor dictates the structure and function of the associated river or stream at the macro level. Consequently, the valley floor width is increasingly recognized as a key parameter and has been employed for many applications (e.g., river classification). Here, we propose an automated algorithm approach to extract the valley floor width of U- and V-shaped valleys by using the breakpoint of the slope between the valley wall and valley floor to support digital elevation models (DEMs) of different resolutions. The algorithm includes five steps: 1) preprocessing data, 2) extracting linear reach, 3) extracting perpendiculars of reaches, 4) delineating the outlines of the valley floor and 5) calculating the width of the valley floor. Eight case studies were used to validate the algorithm. Valley floor outlines and widths were computed and measured, revealing that the algorithm performs well with a high correlation coefficient (CC> 0.88) and coefficient of determination (R2> 0.77), as well as low relative bias (|RB| < 10%). The algorithm performs better when applied in U-shaped valleys than in V-shaped valleys. The algorithm offers a fast and inexpensive tool with which to obtain valley shape information for research and management.