The current study aims to investigate the characteristics of scour topography around High-Rise Structure Foundations (HRSFs) via physical modeling tests. Clear-water scour tests with a uniform non-cohesive bed are modeled under the action of unidirectional steady flows. Time variations of the erosion and deposition topography are measured. The results show that deposition downstream of the first dune behind the HRSF is not located on the centerline of the wake. The deposition pattern indicates that a long steady wake region exists behind the permeable foundation. The scour depth around an HRSF is much less than that around a monopile because of the structural permeability, which gives rise to the bleed flow and a weakened downflow and horseshoe vortex. Additionally, the asymmetry of the HRSF affects the scour rate but not the final equilibrium scour depth. The average scour slope decreases along the direction of the flow. On the contrary, the scour radial distance increases along the direction of the flow, with the average value changing from 1.36D_e to 2.35D_e (where D_e is the equivalent diameter of the foundation). Furthermore, the scour hole around the HRSF is serrated rather than smooth owing to the presence of multiple piles. Empirical formulae are suggested for estimating the evolution of scour depth and volume. These laboratory experiments provide reference information for relevant numerical modeling studies and can be applied to guide engineering designs in an ocean area.

本研究旨在通过物理模型测试研究高层结构基础（HRSF）周围的冲刷地形特征。在单向稳定流的作用下，模拟了具有均匀无粘性床的清水冲刷试验。测量侵蚀和沉积形貌的时间变化。结果表明，HRSF后的第一个沙丘下游的沉积物不位于尾流的中心线上。沉积模式表明在渗透性地基后面存在一个长的稳定尾流区域。由于结构的渗透性，HRSF周围的冲刷深度远小于单桩周围的冲刷深度，这会导致渗出流，减弱的下流和马蹄涡。另外，HRSF的不对称性会影响冲刷速率，但不会影响最终的平衡冲刷深度。平均冲刷斜率沿流动方向减小。相反，冲刷径向距离沿流动方向增加，平均值从1.36更改D _e到2.35 D _e（其中D _e是地基的等效直径）。此外，由于存在多个桩，HRSF周围的冲孔呈锯齿状，而不是光滑的。建议使用经验公式估算冲刷深度和冲刷量的演变。这些实验室实验可为相关的数值建模研究提供参考信息，并可用于指导海洋地区的工程设计。