Drone-Based Monitoring to Remotely Assess a Beach Nourishment Program on Lord Howe Island

IF 4.4 2区 地球科学 Q1 REMOTE SENSING
Drones Pub Date : 2023-09-25 DOI:10.3390/drones7100600
Brendan P. Kelaher, Tommaso Pappagallo, Sebastian Litchfield, Thomas E. Fellowes
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Abstract

Beach nourishment is a soft engineering technique that is used to combat coastal erosion. To assess the efficacy of a beach nourishment program on the northwest coast of Lord Howe Island, remotely coordinated drone-based monitoring was undertaken at Lagoon Beach. Specifically, hypotheses were tested that beach nourishment could increase the dune height and the width of the beach where the sand was translocated but would not have any long-term impacts on other parts of the beach. During the beach nourishment program, sand was translocated from the north end to the south end of Lagoon Beach, where it was deposited over 2800 m2. Lagoon Beach was monitored using a time series of 3D orthomosaics (2019–2021) based on orthorectified drone imagery. The data were then analysed using a robust before-after-control-impact (BACI) experimental design. Initially, a fully automated drone mapping program and permanent ground control points were set up. After this, a local drone pilot facilitated automated drone mapping for the subsequent times of sampling and transferred data to mainland researchers. As well as being more cost-effective, this approach allowed data collection to continue during Island closures due to the COVID-19 pandemic. After sand translocation, the south end of Lagoon Beach had a lower dune with more vegetation and a more expansive beach with a gentler slope than the prior arrangement. Overall, drone monitoring demonstrated the efficacy of the beach nourishment program on Lord Howe Island and highlighted the capacity for drones to deliver cost-effective data in locations that were difficult for researchers to access.
基于无人机的监测远程评估豪勋爵岛的海滩营养计划
海滩营养是一种软工程技术,用于对抗海岸侵蚀。为了评估豪勋爵岛西北海岸海滩营养计划的效果,在泻湖海滩进行了远程协调无人机监测。具体来说,我们测试了一些假设,即海滩营养可以增加沙丘的高度和沙滩的宽度,但不会对海滩的其他部分产生任何长期影响。在海滩营养计划期间,沙子从泻湖海滩的北端转移到南端,在那里沉积了2800多平方米。使用基于正校正无人机图像的3D正形图像时间序列(2019-2021)对泻湖海滩进行监测。然后使用稳健的控制冲击前后(BACI)实验设计对数据进行分析。最初,建立了全自动无人机测绘程序和永久地面控制点。在此之后,一名当地的无人机飞行员为后续的采样提供了自动无人机测绘服务,并将数据传送给大陆的研究人员。除了更具成本效益外,这种方法还允许在因COVID-19大流行而关闭岛屿期间继续收集数据。沙位调整后,礁湖滩南端沙丘较低,植被较多,滩面较开阔,坡度较缓。总体而言,无人机监测证明了豪勋爵岛海滩营养计划的有效性,并强调了无人机在研究人员难以进入的位置提供经济有效数据的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Drones
Drones Engineering-Aerospace Engineering
CiteScore
5.60
自引率
18.80%
发文量
331
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