2023 Volume 79 Issue 18 Article ID: 23-18023
An improvement of an existing 3D topographic measurement method was used to measure the temporal topographic change of a gravel beach using a hydraulic model experiment. The existing method had low reproducibility of the 3D model, limiting the data that could be used to examine topographic changes. The effect on the reproducibility of the 3D model was verified by changing the imaging equipment to increase the processing speed of the images and by changing the imaging conditions by irradiating the gravel beach surface with lighting and lasers. The analysis conditions that best improve the reproducibility of the 3D model were also examined. As a result, the measurement accuracy of the gravel beach topography before and after wave generation was improved, and the measurement error was suppressed to the millimeter level. Furthermore, the improved image processing speed makes it possible to measure the development process of landforms during wave making and the topography of arbitrary cross sections over time.
