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Quantifying decadal volumetric changes along sandy beaches using improved historical aerial photographic models and contemporary data
Earth Surface Processes and Landforms ( IF 3.3 ) Pub Date : 2021-04-13 , DOI: 10.1002/esp.5130
Rafael C. Carvalho 1, 2 , Blake Allan 1 , David M. Kennedy 3, 4 , Chloe Leach 3 , Stephan O'Brien 1 , Daniel Ierodiaconou 1
Affiliation  

Technological advances have reinvigorated the aerial photogrammetric technique using both historical and contemporary imagery, and fostered new perspectives in geomorphology studies. On sandy beaches, however, the dynamic processes, the lack of tonal contrast and reduced texture, make the application of photogrammetry extremely more difficult than in most other landscapes. This study quantifies decadal volumetric changes along the beaches of the Great Ocean Road, Australia, using improved digital surface models (DSMs) derived from structure-from-motion (SfM) photogrammetry applied to historical archives and a contemporary unmanned aerial vehicle survey. Alongside surficial sediment analysis, this approach demonstrates the potential to relate present-day to historical morphological changes at sandy beaches worldwide. The discussion highlights the influence of photographic scale, lens distortions, ground control points in segmented blocks, and the use of shoreline as a proxy of volumetric change. DSMs were derived using datasets obtained in 1946, 1966, 1971, 1977, 1986 and 2019, and compared to a 2007 light detection and ranging (LiDAR)-derived DSM. The emerging approach produced suitable DSMs for volumetric analysis, except for the 1946 dataset, which had the smallest scale and was significantly vertically offset. Volumetric losses of up to 60 m3/m of beach length were calculated for parts of Mounts Bay between 1977 and 2007, and up to 21 m3/m in recent years. At Apollo Bay, the construction of the port in the early 1950s significantly impacted the natural longshore drift to the beach. The adjacent stretch of coastline accreted at a rate of ~35 m3/m between 1966 and 2007, as a function of dredge disposal and changes in sediment transport, whereas a maximum volumetric loss of ~47 m3/m was detected further north between 1977 and 2007. A volume of ~71,330 ± 15,200 m3 was lost from the system from 2007 to 2019, despite the continued deposition along the northern section of the beach.

中文翻译:

使用改进的历史航拍模型和当代数据量化沿沙滩的年代际体积变化

技术进步利用历史和当代图像重振了航空摄影测量技术,并为地貌学研究提供了新的视角。然而,在沙滩上,动态过程、缺乏色调对比度和纹理减少,使得摄影测量的应用比大多数其他景观更加困难。这项研究使用改进的数字表面模型 (DSM) 来量化澳大利亚大洋路海滩沿线的年代际体积变化,该模型源自应用于历史档案的运动结构 (SfM) 摄影测量和当代无人机调查。除了地表沉积物分析外,这种方法还展示了将当今世界与全球沙滩历史形态变化联系起来的潜力。讨论强调了摄影比例、镜头畸变、分段块中的地面控制点以及使用海岸线作为体积变化代理的影响。DSM 是使用 1946、1966、1971、1977、1986 和 2019 年获得的数据集推导出来的,并与 2007 年光检测和测距 (LiDAR) 派生的 DSM 进行比较。新兴方法为体积分析生成了合适的 DSM,但 1946 年的数据集除外,该数据集的尺度最小且垂直偏移显着。体积损失高达 60 m 新兴方法为体积分析生成了合适的 DSM,但 1946 年的数据集除外,该数据集的尺度最小且垂直偏移显着。体积损失高达 60 m 新兴方法为体积分析生成了合适的 DSM,但 1946 年的数据集除外,该数据集的尺度最小且垂直偏移显着。体积损失高达 60 m3沙滩长度/ M计算了1977年和2007年之间的支架湾的部分地区,高达21米3近年/平方米。在阿波罗湾,1950 年代初期港口的建设极大地影响了自然沿岸漂流到海滩。海岸线的相邻拉伸以〜35μm的速率增生3 /米1966和2007之间,如疏通处置和泥沙运动的变化的函数,而〜的最大体积损失47米3检测/米之间进一步北1977 年和 2007年。尽管沿海滩北段继续沉积,但从 2007 年到 2019 年,系统损失了约 71,330 ± 15,200 m 3 的体积。
更新日期:2021-04-13
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