Dislocated boulders are one sign of high‐energy wave impacts on coasts. These high‐energy impacts, caused by severe storms or tsunamis, can trigger initial cracking and transport of boulders. Monitoring of these boulders, as well as the associated coastal sites is important in distinguishing between gradual coastal processes and high‐energy events. Western Greece is a seismically active area, where tsunamis and high‐energetic storms might occur and such past events are documented by historic and geoscientific research, making it an ideal location for monitoring dislocated boulders. Since 2008, monitoring of eight different coastal sites in this region was conducted by terrestrial laser scanning and photogrammetric approaches, with low‐cost unmanned aerial vehicles. The re‐use of similar surveying points in following years, allowed highly accurate monitoring. Point clouds derived from these methods were evaluated for change detection by point cloud comparisons. The data were also used to establish accurate three‐dimensional models of dislocated boulders (n = 70). The determined boulder volumes of these accurate three‐dimensional models were incorporated in wave transport equations and wave decay curves, and compared with monitoring results. A comprehensive overview of dislocated boulders in western Greece is presented. Three‐dimensional boulder reconstruction is compared to an approach which uses a tape‐based measuring of boulder axes, with the tape‐based measurement showing a mean overestimation of mass by 32%. Accurate monitoring over time by both methods, is achieved by using fixed networks of reference points. Changes for each site over time, detected by direct point cloud comparisons, are fit to the possible inundation calculated by wave decay curves based on computed minimum wave heights for boulder transport. Both storm and tsunami waves may have initiated movement from the cliff edge and further transport is also possible. However, boulders showed no further movement from their current position in the area for the time period of this study.

中文翻译：

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监测希腊西部的沉积物预算和大石块-自2008年以来的结果

巨石错位是高能波冲击海岸的迹象之一。由严重的风暴或海啸引起的这些高能影响可能会引发巨石的初始破裂和运输。对这些巨石以及相关的沿海站点进行监控对于区分渐进的沿海过程和高能事件非常重要。希腊西部是地震活跃地区，可能发生海啸和高强度风暴，历史和地质科学研究记录了此类过去的事件，使其成为监测巨石移位的理想地点。自2008年以来，通过地面激光扫描和摄影测量方法对低成本的无人驾驶飞机进行了对该区域八个沿海地点的监测。在接下来的几年中重复使用类似的测量点，允许高度精确的监视。通过点云比较评估了从这些方法得出的点云的变化检测。数据还用于建立错位巨石的精确三维模型（ñ = 70）。将这些精确的三维模型确定的巨石体积纳入波浪传输方程和波浪衰减曲线中，并与监测结果进行比较。介绍了希腊西部流离失所的巨石的全面概述。将三维巨石重建与使用基于磁带的巨石轴测量方法进行了比较，基于磁带的测量显示质量平均高估了32％。通过使用固定的参考点网络，可以通过两种方法随时间进行准确的监视。通过直接点云比较检测到的每个站点随时间的变化，都适合于波浪衰减曲线所计算出的淹没量，波浪衰减曲线基于计算出的巨石运输最小波浪高度而计算。风暴波和海啸波都可能已经从悬崖边缘开始移动，并且还可能进一步运输。但是，在此研究期间，巨石没有显示出其在该地区当前位置的进一步移动。