桑沟湾邻近海域潮余流对该海域物质输运具有重要作用,但由于观测资料不足的限制,该海域潮余流的整体分布状况尚不明确。本文利用22套锚系海流观测资料和高分辨率数值模拟资料,分析了桑沟湾邻近海域潮余流的整体分布特征,并探讨了其产生机理。桑沟湾内潮余流总体上较弱,其邻近海域的潮余流在3个岬角(俚岛,寻山和楮山)附近呈现出显著的潮余流涡对结构,每个岬角的北面存在气旋式潮余流涡,南面存在反气旋式潮余流涡。无论是流速大小还是涡覆盖范围,俚岛和楮山外海潮余流涡对均大于寻山外海的涡对。动力诊断分析表明,岬角附近3对潮余流涡的主要形成机制都是由侧边界摩擦引起的水平剪切作用,底摩擦应力旋度的作用只影响俚岛附近的潮余流涡对,位势涡度守恒的作用都不显著。
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