珠江河口底边界层Taylor假设检验

Testing Taylor′s hypothesis on the bottom boundary layer in the Pearl River

通过三台ADV对珠江河口伶仃洋底边界层的Taylor假设进行了检验。实验结果表明:1)当平均流速大于0.1 m/s时,相距8 cm的两台ADV之间的空间相关系数和时间相关系数基本满足相等关系,表明Taylor假设在河口底边界层具有一定的合理性;2)空间相关系数的变化反映了湍涡最大相关尺度的变化。对于距底20 cm的底边界层湍涡,其最大相关尺度的临界值约为12 cm。超出该范围后,湍涡将不再具有相关性。

Taylor′s hypothesis for bottom boundary layer of Lingdingyang estuary in the Pearl River is verified by three ADV.The result shows that：（1） Spatial correlation coefficient and temporal correlation coefficient for two ADV which is apart 8 cm are almost equal,when the average current speed is lager than 0.1 m/s.It means that Taylor′s hypothesis is reasonable at bottom boundary layer of estuary;（2） Variation of spatial correlation coefficient reflects the largest eddy correlative scale.The critical value of the largest correlative scale is about 12 cm for the eddy,which is 20 cm above bottom.Beyond this range,the eddy will no longer be relevant.