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象山港盐度分布和水体混合I.盐度分布和环流结构
董礼先, 苏纪兰
国家海洋局第二海洋研究所 杭州310012
摘要:
利用1981–1990年的实测水文资料分析了象山港与混合密切相关的盐度分布和环流结构，并对盐度锋面出现成因进行了探讨。研究结果表明，象山港盐度受长江冲淡水活动影响较大，冬、夏口门附近盐度分别为24–25左右和31以上，湾顶附近盐度季节变化不大。冬季湾内盐度空间梯度较小。夏季湾内有两个盐度锋面出现，水体垂向略有层化但并无明显的跃层出现。此外，象山港狭湾内以重力环流为主，狭湾外以水平环流为主。
关键词:  盐度分布  锋面  环流  象山港
DOI：10.11693/hyhz200002007007
分类号:
基金项目:国家自然科学基金资助项目，48907026号
SALINITY DISTRIBUTION AND MIXING IN XIANGSHANGANG BAY I. SALINITY DISTRIBUTION AND CIRCULATION PATTERN
DONG Li-xian, SU Ji-lan
Second Institute of Oceanography, State Oceanic Administration, Hangzhou, 310012
Abstract:
The salinity distribution, mixing processes and their controlling mechanism in Xiangshangang Bay are analyzed using a data set collected during 1981–1990. Influencing by Changjiang diluted water, the salinity in Xiangshangang Bay has a large seasonal variation, with a maximum value of about 24–25 in winter and more than 31 in summer. The longitudinal salinity gradient in summer is larger than that in winter. Two salinity fronts in bayhead areas and over the middle part of the system, respectively, are formed in summer as a result of freshwater dilution and the mixing capacity difference between the inside and outside of the inlet. The residual current pattern is mainly horizontal in the outside part of the Xiangshangang Bay inlet and vertical within the inlet.
Key words:  Salinity, Front, Circulation, Xiangshangang Bay
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