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在测流过程中和资料整理时会有各种各样误差引进。但是,其中有三种误差是主要的: 1.船体的影响。铁船体本身具有磁性。它能改变海流计中磁罗经的方向,船体对表层海流流速也有影响,一般来说铁船体可使流向差的方均根值达30°～49°,流速差的方均根值达4～10厘米/秒。 2.余流是低频的流动,具有3、5、10,15天,甚至更高的变化周期。在一个定点站只观测25小时的海流资料,是得不出准确的余流值,要尽可能延长观测资料的时间序列长度。 3.用观测24小时的海流资料序列来分析余流要比用25小时海流资料序列分析余流误差大,引起最大误差可达±4%。
There will be a variety of errors introduced during the flow measurement and data collation. However, three of these errors are major: 1. The impact of the hull. The iron hull itself is magnetic. It can change the direction of the magnetic compass in the current meter. The hull also has an influence on the surface current velocity. Generally speaking, the iron hull can reduce the root mean square value of the flow to 30 ° ~ 49 ° and the root mean square value of the flow velocity difference to 4 ~ 10 cm / s . 2. I-flow is low-frequency flow, with 3, 5, 10, 15 days, and even higher cycle of change. Observing 25-hour ocean current data at a fixed point can not provide an accurate residual current value. The time series length of the observed data should be prolonged as much as possible. 3. It is better to use the observed 24-hour ocean current data sequence to analyze the residual current than to use the 25-hour ocean current data sequence to analyze the large residual error, causing the maximum error up to ± 4%.