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本文依据丁字湾水文观测资料阐述了该湾温、盐度分布及变化特征，并对潮汐、潮流和余流进行了分析研究．结果表明：1．丁字湾温、盐度分布的月际差异明显．水温8月最高，盐度9月最低；水温日变化主要受太阳辐射的影响，盐度日变化则明显由潮汐所控制．2．该湾潮汐类型属正规半日潮，但潮汐日不等现象明显．3．该湾属于正规半日潮流区域，潮流运动以往复流为主。4．8月湾口中部余流从湾外流向湾内，湾口两端余流流向与中部相反；余流流速湾口中部大于两端。
Based on the Tidal Bay hydrological data, the distribution of temperature and salinity of the bay and its variation characteristics are expounded. The tide, tidal current and residual flow are analyzed. The result shows: 1. T bay temperature, salinity distribution of obvious differences between the months. The water temperature was the highest in August and the salinity was the lowest in September. The diurnal variation of water temperature was mainly affected by solar radiation, while the diurnal variation of salinity was obviously controlled by tides. 2. The type of tide in the bay is a formal half-tide, but tidal day is not clear. 3. The Bay is a formal half-day trend area, the trend of reciprocating flow-based movement. 4.5. The excess flow in the middle of Wankou Bay flows from the bay to the bay. The residual flow at the two ends of the bayou is opposite to that in the middle. The excess flow at the middle of the bay is greater than the two ends.