Modelled bottom current (BALANCE)

Summary Model results of the annual mean bottom current velocity (m/s). Description This dataset shows model results of the annual mean bottom current velocity (m/s). Data source, NERI/Denmark. Currents in the sea can be generated by many different parameters, among which are: I. Tidal motion II. Wind stress III. Density difference due to differences in salinity or temperature IV. Seismic activity and motion of the earth In near shore regions, the wave-induced along shore currents are the dominating currents, whereas in offshore regions, a combination of tidal and meteorological forces is the dominating current generating parameters. Near the sea bottom the friction of the current flow forms a turbulent layer, termed boundary layer, over the seabed. The thickness of this layer ranges from few meters up to several tens of meters. Within this layer the current speed increases nonlinearly with the height above the seabed, being zero at the seabed and maximum at the top of the layer. The variation of the current speed with height above the seabed is called current velocity profile.摘要：年平均海底流速（单位：米每秒，m/s）的模式结果。 本数据集展示了年平均海底流速（单位：米每秒，m/s）的模式结果，数据来源为丹麦国家环境研究所（NERI）。海洋洋流的形成可由多种不同参数驱动，具体包括：I. 潮汐运动；II. 风应力；III. 由盐度或温度差异引发的密度差；IV. 地震活动与地球运动。在近岸区域，波浪诱导的沿岸流为主要洋流；而在远海区域，潮汐与气象力的共同作用则是主导洋流生成的核心参数组合。在海底附近，水流的摩擦作用会在海床之上形成湍流层，该层被称为边界层，其厚度范围为数米至数十米不等。在该边界层内，水流流速随距海床的高度呈非线性增长，在海床表面流速为零，在层顶处流速达到最大值。水流流速随距海床高度的变化关系被称为流速剖面。