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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Rates of planimetric change in a proglacial gravel-bed braided river: Field measurement and physical modelling
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Rates of planimetric change in a proglacial gravel-bed braided river: Field measurement and physical modelling

机译：Prooglacial砾石床编织河上的平面变化率：现场测量和物理建模

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Planimetric change was measured on daily hydrographs over two meltwater seasons using time-lapse images of the proglacial, gravel, braided, Sunwapta River, Canada. Significant planimetric change occurred on 10-15 days per year. Area of planimetric change correlated with peak and total daily meltwater hydrograph discharge. A clear threshold discharge can be identified below which no planform activity occurs, an intermediate range over which change occurs conditionally, and a peak flow range at which significant change always occurs. Field conditions were reproduced in a physical model in a laboratory flume. Photogrammetric DEMs of bed morphology and measurements of bedload output were made for each hydrograph experimental run. The physical model results for planimetric change had a threshold discharge for change, and trend with discharge, similar to the field data. The model data also show that planimetric change correlates strongly with volumes of erosion/deposition measured from successive DEMs, and with bedload transport rate. The relation between planimetric change and topographic change is also apparent from previous cross-section surveys at the field site. The results highlight the planimetric dynamics of braiding rivers in relation to discharge forcing, and the relationship between planimetric change, morphological change, and bedload transport in braided rivers. This also points to the potential use of measurements of planimetric change from time-lapse imagery as a low-cost method for high-frequency monitoring for braiding dynamics and also a surrogate for bedload transport measurement. (c) 2018 John Wiley & Sons, Ltd.
机译：使用Proglacial，Gravel，Raided，Sunwapta River，Canada的时间间隔图像，测量了两种熔喷季节的日常水季节上的平面图。显着的平面变化每年10-15天发生。平面图的面积与峰值和总日熔水水文放电相关。下面可以识别出清晰的阈值放电，没有发生平面变形活动，在条件上发生变化的中间范围，以及始终发生显着变化的峰值流量范围。在实验室水下的物理模型中再现现场条件。对每次水文术后，对床形态的摄影测量和床单输出的测量。平面变化的物理模型结果具有用于变化的阈值放电，并且具有与现场数据类似的放电趋势。模型数据还表明，平面变化强烈地与从连续的DEMS测量的腐蚀/沉积的体积强烈相关，并以床单运输速率强。平面变化与地形变化之间的关系也是从现场网站上的先前横截面调查中显而易见的。结果突出了与放电迫使的编织河流的平面动态，以及编织河流的平面变化，形态变化与床单运输之间的关系。这还指出了从延时图像的平面变化的潜在使用测量，作为编织动力学的高频监测的低成本方法，也是床单运输测量的代理。 （c）2018 John Wiley＆Sons，Ltd。

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