Quantification of bedform dynamics and bedload sediment flux in sandy braided rivers from airborne and satellite imagery
Quantification of bedform dynamics and bedload sediment flux in sandy braided rivers from airborne and satellite imagery
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通过机载和卫星图像量化沙质辫状河中的床形动力学和床载沉积通量
DOI：
10.1002/esp.4558
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发表时间：
2019
影响因子：
3.3
通讯作者：
Strick R
中科院分区：
文献类型：
--
作者：
Strick R
来自专门委托的飞机架次（载人飞行器，MAV），重复无人驾驶飞行器（UAV）调查和Planet CubeSat卫星的图像用于量化加拿大南萨斯喀彻温省桑迪辫状河的沙丘和沙洲动态。运动恢复结构（SfM）技术和深度亮度模型的应用被用于在低和近岸流条件下生成一系列数字表面模型（DSM）。一些技术和图像处理的挑战，所产生的SfM在干燥和淹没的环境中的应用。分析表明，深度-亮度模型方法可以反映低浊流浅（< 2 m深）桑迪辫状河不同尺度的底形特征，并利用航空影像分别定量分析了18 km河段和3 ~1 km河段的单元沙坝和沙丘迁移率的空间分布。沙丘和单元坝迁移率是高度可变的，以响应当地的变化，在平面形态。通过整合迁移速率（来自无人机）和移动的沉积物体积（来自使用MAV图像的DSM）获得的沙丘和单元沙洲的沉积物输运速率显示出沉积物通量的近似相等。因此，基于河段的输沙率估计值可以仅从单位沙坝数据得出。此外，它表明，合理的估计输沙率可以使用刚刚从二维图像，包括从卫星图像测量的单位酒吧迁移率，只要明智的假设是关于平均酒吧的形状和高度。随着最近频繁的重复卫星图像的可用性，以及进行重复MAV和UAV调查的便利性，第一次，可能有可能提供大型或难以进入的低浊度河流的推移质泥沙通量的全球估计值，这些河流目前缺乏有关推移质泥沙输移率的信息。© 2018作者地球表面过程和地貌由约翰威利父子有限公司出版。
Images from specially‐commissioned aeroplane sorties (manned aerial vehicle, MAV), repeat unmanned aerial vehicle (UAV) surveys, and Planet CubeSat satellites are used to quantify dune and bar dynamics in the sandy braided South Saskatchewan River, Canada. Structure‐from‐Motion (SfM) techniques and application of a depth‐brightness model are used to produce a series of Digital Surface Models (DSMs) at low and near‐bankfull flows. A number of technical and image processing challenges are described that arise from the application of SfM in dry and submerged environments. A model for best practice is presented and analysis suggests a depth‐brightness model approach can represent the different scales of bedforms present in sandy braided rivers with low‐turbidity and shallow (< 2 m deep) water.The aerial imagery is used to quantify the spatial distribution of unit bar and dune migration rate in an 18 km reach and three ~1 km long reaches respectively. Dune and unit bar migration rates are highly variable in response to local variations in planform morphology. Sediment transport rates for dunes and unit bars, obtained by integrating migration rates (from UAV) with the volume of sediment moved (from DSMs using MAV imagery) show near‐equivalence in sediment flux. Hence, reach‐based sediment transport rate estimates can be derived from unit bar data alone. Moreover, it is shown that reasonable estimates of sediment transport rate can be made using just unit bar migration rates as measured from 2D imagery, including from satellite images, so long as informed assumptions are made regarding average bar shape and height. With recent availability of frequent, repeat satellite imagery, and the ease of undertaking repeat MAV and UAV surveys, for the first time, it may be possible to provide global estimates of bedload sediment flux for large or inaccessible low‐turbidity rivers that currently have sparse information on bedload sediment transport rates. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.
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影响因子：
5.4
作者：
C. Legleiter
通讯作者：
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影响因子：
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作者：
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影响因子：
3.3
作者：
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影响因子：
6.3
作者：
Filippo Bandini;D. Olesen;J. Jakobsen;C. M. Kittel;Sheng Wang;Mónica García;P. Bauer‐Gottwein
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DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
C. Kelleher;Christopher Scholz;L. Condon;Marlowe Reardon
通讯作者：
Marlowe Reardon