Wind speed data

Field measurements of wind flow and sand transport were conducted over a low gradient (25 m wide beach, and concave to straight, low to moderate gradient (up to 31°), 200 m long, climbingdune slope in southern Morocco. Velocity profiles and sand transport measurements were conductedat 10 sites across this system. Site 1 was located on the flat beach, sites 2 and 3 on the gentle lowerslope (effective slope to 8 at the steepest upper portion of the slope (26-29° effective slope). Generally, the wind speedincreases significantly above site 4 and this increase is inversely proportional to the wind speed.Although a slight deviation from log-linear is evident in the wind velocity profiles, they are essentiallylog-linear, which results from the absence or low curvature of the dune’s slope over a long distance.Regardless of slope inclination, when flow accelerates, the relative increase of wind speed with heightabove the bed is higher. A total of 254 measurements of vertical mass flux distributions were analyzed,and regardless of the site topography, a flat horizontal or inclined slope, all mass flux profiles are welldescribed by an exponential-decay function.在摩洛哥南部，研究团队针对两类区域开展了气流与输沙的野外实地测量：其一为宽25米、呈凹弧至平直形态的低坡度海滩；其二为坡度介于中低区间（最大31°）、长200米的爬升沙丘坡面。本次研究在该区域内共布设10个测点，开展风速廓线与输沙量测量。其中测点1位于平坦海滩；测点2、3位于缓坡下坡段，该坡面最陡的上段等效坡度为8，对应实际坡度26°至29°。总体而言，测点4以上区域的风速显著升高，且该风速增幅与来流风速呈反比关系。尽管风速廓线存在轻微的对数线性偏离，但整体仍基本符合对数线性分布特征，这源于该沙丘坡面在长距离范围内曲率极低或近乎平直。无论坡面倾角如何，当气流加速时，床面上方的风速随高度的相对增幅均更高。本次研究共分析了254组垂直质量通量分布实测数据，结果显示，无论测点所在地形为平坦水平坡面还是倾斜坡面，所有质量通量廓线均可通过指数衰减函数实现良好拟合。