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南渡江河口长度较短,河口内驻波发育。河口内盐水入侵近年来呈加剧之势。根据2009年2月大小潮多站同步的周日水流、盐度观测以及2009年11-12月连续38天的表层盐度观测资料,结合EFDC数值模拟结果,分析了南渡江河口枯季大小潮期的盐度与水体分层的时空变化规律。结果表明,枯季时南渡江河口干流自口门向陆,潮流流速递减,盐度减小,水体分层增强。水体分层在落潮时增大,涨潮时减小。大潮期的混合作用强于小潮期。河道内采砂形成的深坑对高盐水起到捕集作用,涨潮时输入的高盐水在落潮时无法向海输出,对南渡江的盐水入侵起到加剧作用。实测资料显示,小潮期的盐水入侵长度要大于大潮期。
The length of the Nandu River estuary is short and the standing wave in the estuary develops. In recent years, salt water intrusion in the estuary has intensified. According to the observation data of the sunflow and salinity at the synchronicity of large and small tidal wave stations in February 2009 and the observation data of surface salinity for 38 consecutive days from November to December in 2009 and the EFDC numerical simulation results, The salinity of the water body and the temporal and spatial variation of water body stratification. The results show that the dry flow of Nandu River estuary from the gate to the land in the dry season decreases with the decrease of the flow velocity, the salinity decreases and the water layer stratification increases. The stratification of water increases at low tide and decreases at high tide. The tidal period of mixing is stronger than the tidal period. The deep pit formed by sand mining in the river channel plays a role in trapping high salt water. The high salt water input at high tide can not be exported to the sea at low tide, aggravating the salt water invasion of the Nandu River. The measured data show that the length of saline intrusion during the tide is greater than the tide period.