滦河口水文环境要素季节性变化特征及动力响应关系

基于2013年夏、冬季的最新实测资料,分析研究了滦河口海域温度、盐度、Chl a、浊度和DO等水文环境要素的季节性变化特征。结果表明:温度季节性差异较大,夏季呈现近岸向远岸递减之趋势,冬季与夏季截然相反,呈现由近岸向远岸递增之趋势;冬季水体的盐度要高于夏季,河口南部近岸存在向南流动的低盐水舌,夏季的范围大于冬季;冬季水体的浊度远高于夏季,且在河口以北和以南海域存在高值区,表现出夏储冬运的输运特征。冬季水体的Chl a和溶解氧也高于夏季,反映了Chl a、DO与温度的负相关性。各水文要素与潮汐潮流之间具备一定相关性。温度、Chl a、DO的变化极有规律,涨潮期间,温度、Chl a和DO减小,落潮期间增大,单周日内表现出双峰结构,且峰值不同。水体浊度在周日内也出现两次峰值,均出现于两次较大流速发生时刻。

Seasonal variation characteristics of hydrological environment factors and dynamic response relationship in Luanhe Estuary

Based on the observation data in summer and winter, 2013, to analyze the seasonal variation characteristics of temperature, salinity, turbidity, Chlorophyll a, and Dissolved oxygen.The results show that the temperature isgreatlyaffectedbydifferentseasonswith obviousseasonaldiversity, and the summer temperature decreases from the inshore to the offshore, however, the temperature increased from the inshore to the offshore in winter, being significantly lower than in summer; The salinity is greater in winter than that in summer, and a low salinity tongue along the south flowing in the south of the estuary in both season, but the range is greater in summer than that in winter; The suspended sediment concentration and sediment transport scope are greater in winter than that in summer, and two maximum turbidityareas are located in the north and south of the estuary, and the bottom turbid is far greater than the surface, which indicates the small and medium-sized rivers also have the distributions of storage in summer and transport in winter as the large rivers; The Chlorophyll a and Dissolved oxygen is greater in winter than that in summer, indicating the negative correlation between Chlorophyll a, Dissolved oxygen and temperature.The hydrological environment factors exhibit obvious periodical with tidal changes trend.The temperature, Chlorophyll a and Dissolved oxygen increases during ebb tide, and decreases during the flood tide, showing bimodal structures with different peak value in one day.The maximum value of turbidity appears after the larger velocity has reached, which indicates most water column sediment is provided by seabed sediment re-suspended.