椒江河口盐淡水混合对口外拦门沙的作用

本文根据1980年洪季和1983年枯季对椒江河口两次9站同步大潮的水文泥沙观测,探讨盐淡水混合对口外拦门沙的作用,观测数据的分析和计算表明,拦门沙年内洪淤枯冲的变化规律与河口“锋面”(全潮净流速为零的面)密切有关,而与近底层“滞流点”的关系不大。经拦门沙断面量测,证实了分析结果与实际量测情况基本相符。

MIXING ACTION OF SALINE WATER WITH FRESH WATER OF JIAOJIANG RIVER ESTUARY ON THE MOUTH BAR

On the basis of the 25h synchronous measurements of current velocity, water depth, salinity and SMP concentration made at 9 stations of the JiaoJiang River estuary during the spring tides in July, 1980 and November, 1983, this paper discusses the mixed action of saline water with fresh water on the mouth bar in JiaoJiang River estuary. An analysis of the obtained data shows that the changes of siltation in flood season and errosion in dry season within a year is closely related to estuary "Front" (the front is defined as a face where the net velocity during a tidal period is zero), but not to the "null point". The results of anslysis is in conformity with measured topography.