近年珠江三角洲潮流特征变化分析

Change Analysis of Tidal Current Characteristics in the Pearl River Delta in Recent Years

针对河道取砂等因素的影响,基于实测资料,建立珠江口潮流数学模型,通过模型计算,从潮位、潮波传播速度、潮区界与潮流界位置、潮量与历时等方面,分析了近年珠三角潮流特征的变化情况。结果表明:网河区潮位总体下降明显而口门区潮位变幅较小,潮波传播速度变快,潮区界、潮流界往上游移动,潮流动力增强、径流动力相对减弱,涨潮通量增加、历时延长。成果供航道整治与港口建设等参考。

For river sand - digging and other factors, the tidalcurrent numerical model of Pearl River Estuary is built based on measured data. This paper analyzed the changes of tidal current characterstics of Pearl River Delta in recent years by model computation from the tidal level, the tidal wave dissemination velocity, the location of tidal limit and tidal current limit, the tidal volume and duration, etc. Results showed that the tidel level hadadramtic decline in the overall water netand a little change at the entrance area. Besides, the dis- semination velocity of tidal wave became faster, tidal limit and tidal current limit movedto upstream. Also, it showed the stronger tidal power and the relative weakening runoff. The discharge of flood current increased and lasted longer at the same time. The results could be references to the channel regulation, port constructionand so on.