防城湾的环境特征及其水体自净特点分析

根据(1983-1997)15 a间对防城湾6个航次的调查资料,分析探讨了该湾水体的自净能力。结果表明:该湾具有较强的水体自净能力,但与北海湾和钦洲湾的表现特点明显不同。物理自净能力虽以往复流影响为主,但其旋转方向是以逆时针方向为主,且湾内外流速出现大小不等现象,与该湾特殊的地形影响有关;较强的化学自净能力虽从富氧特征及明显偏低的COD值体现出来,但三态氮的形态转化没有达到较佳状态,与该湾多方位、多途径源源不断地向湾内直接排放富含有机物的生活污水及养殖废水有关;生物自净能力既体现在微生物对有机物较强的降解能力上,也体现在浮游植物对DO的贡献作用及其对营养盐的吸收能力上,具有富营养海湾的水体自净特点。

The environmental feature and analysis on character of waterbody self-purification in Fangcheng Bay

According to the datum from 6 surveys in Fangcheng Bay in 15a (1983 - 1997),the self-purification ability of waterbody was analysed.The result showed that the self-purification ability of waterbody of the bay was strong, which was obviously different from Beihai bay and Qingzhou Bay. Although the physical self-purifying ability in Fangcheng Bay was mainly effected by the oscillating currents, it contrarotated mainly and the velocity of flow wasn t sizable between outside and inside in the bay, which was relative to the effect of the special landform. Though the strong chemical self-purifying ability showed from the charater of oxygen profuse and the clear low COD value, the form conversion of the three states of nitrogen could not be able to get on better status, which was relative to the living sewage and the culture effluents directly inter endlessly into the bay. The strong degradation ability of microorganism acts on the organic matter and the contribution of phytoplankton to DO and the absorption ability to nutrients embodies the biological self-purifying ability, which has the character of self-purifying ability of waterbody of eutrophic gulf.