水资源保护2011，Vol.27Issue(4)：31-34,4.DOI:10.3969/j.issn.1004-6933.2011.04.008
长江口北支近期水流泥沙输移及含盐度的变化特性
Variation characteristics of sediment transport and salinity in north branch channel of Yangtze River estuary in recent years
李伯昌 1余文畴 2陈鹏 1徐俊1
作者信息
- 1. 长江水利委员会长江口水文水资源勘测局,上海,200136
- 2. 长江水利委员会长江科学院,湖北,武汉,430010
- 折叠
摘要
Abstract
In order to ensure the navigation functions of the north branch channel of the Yangtze River estuary and to meet the demand of water diversion and drainage in the region along the Yangtze River, the observed hydrology data of the Yangtze River Estuary since the 1970s, was analyzed. The results show that the flow diversion ratio of the north branch channel of the Yangtze River has been decreased continually in recent years, and its value at flood tide is greater than that at ebb tide. The sediment diversion ratios at flood and ebb tides tend to decrease in flood and dry seasons, and they are greater than the corresponding flow split ratios. The phenomenon that sediment flows backward into the south branch of Yangtze River estuary has been weakened in recent years. The influence of nmoff on the north branch channel is decreasing gradually, and the tidal current has a dominant influence on the north branch channel. With the gradual narrowing of the bell-mouth in the downstream reach, the flood tidal volume tends to decrease. The sediment concentration at flood tide is greater than that at ebb tide. The sediment concentration at the reach where the flow paths of flood current and ebb current separate is greater than that at other sites. The salinity of the north branch channel in dry season is significantly greater than that in flood season. The salinity variation along the north branch in flood season is greater than that in dry season. The salinity has been decreased in recent years. The artificial narrowing projects have a significant effect on the recent variation of sediment transport and salinity of the north branch channel.关键词
潮汐/潮流/分流比/分沙比/含盐度/北支/长江口Key words
tide/ tidal current/ flow diversion ratio/ sediment diversion ratio/ salinity/ north branch channel/ Yangtze River estuary分类
天文与地球科学引用本文复制引用
李伯昌,余文畴,陈鹏,徐俊..长江口北支近期水流泥沙输移及含盐度的变化特性[J].水资源保护,2011,27(4):31-34,4.
