丁字湾水文环境特征

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。

The Hydrological Conditions of Dingzi Bay

According to the survey data, this paper deals with the distribution and variation characteristics of water temperature and salinity in Dingzi Bay, together with an analysis of it tide, tidalcurrent and residual current. The results indicate that: (1) The monthly variations of distributions of water temperature and salinity in Dingzi Bay were obvious. water temperature was the highest in August in a year and salinity was the lowest in September in a year. The diurnal change of water temerature was mainly affectcd by radiation of the sun. while the diurnal change of salinity was apparently controlloed by tide. (2) The tidal tye of Dingzi Bay was of the regularsemi-diurnal tide, but the diurnal inequality was evident. (3) The a tidal current of Dingzi Bay was of the regular semi-diurnal tide current, the reciprocal current was the dominant part of the tidal current. (4 ) In August, the ressidual current flew towards the bay from the open sea in the middle part of Dingzi Bay mouth and flew towards the open sea from the bay in the southern and northern ports of it. The velocity of the residual current in the middle part of the bay mouth was larger than those in the southern and northern pperts of it.