垂线平均流速流向计算方法探讨

声学多普勒流速剖面仪可以测量多层水深的流速流向数据,但目前只使用其中符合传统"六点法"的数据,多余数据被舍弃浪费。文章根据传统的"六点法"垂线平均流速流向的计算原理,给出了"多点法"计算垂线平均流速流向的计算公式。根据上海洋山港海域和招远海域实测流速资料,对采用"六点法"和"多点法"计算垂线平均流速流向的结果进行了分析比较。结果表明:"六点法"和"多点法"计算的垂线平均流速值基本相当,但垂线平均流向差值随着垂线平均流速的减小而呈增大趋势。

Research on computing vertically-averaged current velocity and direction

Acoustic Doppler Current Profiler makes it possible to measure current velocity and current direction at any water depth, however, only the data consistent with the traditional six-point method are utilized, and others are abandoned and wasted. In this paper, based on the theorem to compute vertically-averaged current velocity and current direction by traditional six-point method, formulae were given to calculate vertically-averaged current velocity and current direction by multi-point method. According to in-situ data from Yangshan Harbor sea area and Zhaoyuan sea area, the computation results of vertically-averaged current velocity and current direction by traditional six-point method and multi-point method were analytically compared. The results show that the computed vertically-averaged current velocities by two methods are basically identical to each other, however, the difference of current direction tends to increase when the velocity decreases.