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首页> 外文期刊>Oceanologia >Coherent current oscillations and water exchange in the straits of the Gulf of Riga
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Coherent current oscillations and water exchange in the straits of the Gulf of Riga

机译：里加湾海峡的相干电流振荡和水交换

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The water exchange processes through the Irbe and Virtsu (Suur) Straits were investigated in 1993-1997 within the framework of a five-year study programme - the Gulf of Riga Project. Simultaneous current measurement data from autonomous mooring stations in both straits were available for the analysis in two periods. In addition to the dominant signals - inertial oscillations in the Virtsu Strait and diurnal oscillations in the Irbe Strait - low-frequency oscillations were found in both straits. During the experiment in July-August 1994, 12-14-day oscillations were observed in both straits: the maximum phase lag in the Virtsu Strait was 1 day. The other important low-frequency periodic component in both straits was 88 hours. In this case, the phase lag in the Virtsu Strait was about 20 hours. In the 1995 experiment in the Irbe Strait, 42-hour oscillations were observed with a phase lag of 10-12 hours. The amplitude was about 30 cm -1 in both straits. As in Lilover et al. (1998), where the flow regime in the Irbe Strait was observed, we can interpret these oscillations as being wind-generated. The present work shows the existence of these disturbances also in the Virtsu Strait. The 88-hour oscillations observed in July-August 1994 can be interpreted as the first mode of the basin's eigenoscillations according to the concept of Otsmann et al. (1997) of a basin with two separate outlets. The lowest frequency oscillation with the period of 12-14 days seemed to propagate to the Gulf of Riga from the Baltic Proper, but the generating force could not be established because there was no noticeable variability between depressions and anticyclones during that period. Based on the current measurements, two types of water exchange through the Irbe strait were established: the outflow over the whole cross-section of the strait, and a bidirectional flow with an inflow near the southern shore and increasing inflow in the near-bottom layers and an outflow in the northern part of the strait.
机译：1993年至1997年，在一项为期五年的研究计划（里加湾项目）的框架内，对通过Irbe和Virtsu（Suur）海峡的水交换过程进行了调查。来自两个海峡的自主系泊站的同时电流测量数据可用于两个时期的分析。除了主要的信号（Virtsu海峡的惯性振荡和Irbe海峡的日振荡）外，两个海峡都发现了低频振荡。在1994年7月至8月的实验中，两个海峡均观测到12-14天的振荡：Virtsu海峡的最大相位滞后为1天。两个海峡中另一个重要的低频周期性成分是88小时。在这种情况下，Virtsu海峡的相位滞后约为20小时。在1995年的Irbe海峡实验中，观测到42小时的振荡，相位滞后为10-12小时。两个海峡的振幅约为30 cm -1。如在Lilover等人中。 （1998年），观察到易北河海峡的流动状态，我们可以将这些振荡解释为风的产生。目前的工作表明，在Virtsu海峡也存在这些干扰。根据Otsmann等人的概念，1994年7月至8月观察到的88小时的振荡可以解释为盆地本征振荡的第一种模式。 （1997年）的一个盆地有两个独立的出口。最低频率的振荡出现在12-14天之间，似乎是从波罗的海波罗的海传播到里加湾的，但由于在此期间凹陷和反气旋之间没有明显的变化，因此无法确定产生力。根据当前的测量结果，建立了通过易北河海峡的两种类型的水交换：海峡整个断面的出水量，以及双向流，其中南岸附近有入水量，而近底层有增水量在海峡北部流出。

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