Water Surface Elevations and Near-bed Velocity Measurements over Ultra-rough Bed Surfaces Subjected to Regular Waves

Ultra-rough oceanic surfaces, such as oyster reefs, bare the potential to effectively attenuate wave energy due to increased bed roughness compared to the surrounding sea floor. The high bed roughness is influenced by the size and shape of the individual roughness elements, e.g., the oyster shells. To effectively employ ultra-rough oceanic surfaces as a nature-based solution in coastal protection, a currently unavailable detailed understanding of the frictional wave energy dissipation processes is necessary. This dataset provides the results of an experimental study in which primitive surrogate models of ultra-rough oceanic surfaces were subjected to regular waves. Three shapes of roughness elements (bluntly-shaped (semicircle), sharp-edged (lamella), and combinations thereof (mix)) with two spacings between elements, λ (1: λ1 = 0.10 m; 2: λ2 = 0.20 m), have been tested, resulting in six ultra-rough bed surface configurations (abbreviated as: SC1, SC2, L1, L2, M1, and M2) and a reference configuration (REF) without roughness elements. The surrogate models (total length of 16 m) were subjected to regular waves with a constant water depth d = 0.7 m, a constant wave height H = 0.147 m, and varying wave periods T = 1.5 s; 2.0 s 2.5 s; 3.0 s. The dataset comprises water surface elevations η and near-bed instantaneous velocity components, ui, vi, and wi, in x, y, and z directions, respectively, measured along the tested ultra-rough bed surfaces.

诸如牡蛎礁这类超粗糙海洋表面，相较于周边海底床面，因床面粗糙度更高，具备有效衰减波浪能量的潜力。床面的高粗糙度受单个粗糙单元（如牡蛎壳）的尺寸与形态影响。为将超粗糙海洋表面有效用作海岸防护领域的基于自然的解决方案（nature-based solution），目前仍需建立对摩擦型波浪能量耗散过程的详尽认知，但此类认知目前仍较为匮乏。本数据集收录了一项实验研究的成果：该实验以超粗糙海洋表面的简化替代模型为研究对象，使其承受规则波浪作用。本次实验共测试了三种形态的粗糙单元：钝型（半圆形，bluntly-shaped (semicircle)）、锐边型（lamella）以及二者的组合型（mix），且每种形态分别设置两种单元间距λ（1: λ1=0.10 m；2: λ2=0.20 m），最终形成6种超粗糙床面配置（缩写为SC1、SC2、L1、L2、M1、M2）以及1组无粗糙单元的基准配置（REF）。该替代模型总长16 m，实验中施加的规则波浪参数为：恒定水深d=0.7 m、恒定波高H=0.147 m，以及变化的波浪周期T=1.5 s、2.0 s、2.5 s、3.0 s。本数据集包含沿测试超粗糙床面采集的水面高程η，以及x、y、z三个方向的近底瞬时流速分量ui、vi、wi。