本文選題：河口羽流 + 小河口　； 參考：《熱帶海洋學(xué)報》2017年04期

【摘要】：小河口與大河口的羽流特征具有顯著的不同,其更多地受風(fēng)、徑流的變化所控制。文章以海南博鰲萬泉河口為例,研究其河口羽流的季節(jié)性變化特征,以及洪水對河口羽流的影響。采用動量平衡方法,分析了萬泉河口羽流的動力特征。結(jié)果表明,萬泉河口羽流具有顯著的季節(jié)性變化,羽流的擴(kuò)展路徑與范圍主要受徑流和風(fēng)的控制,夏季時以向外海與向上游方向(相對于開爾文波的傳播方向)擴(kuò)展為主,而冬季時則向下游擴(kuò)展。夏季的羽流范圍大于冬季。一次近2天的洪水可極大地影響羽流的范圍及鹽度大小,鹽度減小1‰的范圍可達(dá)300km2。但洪水過后,在風(fēng)與潮汐的混合作用下,河口近岸的鹽度可較為快速地恢復(fù)到洪水前水平。在羽流的遠(yuǎn)場區(qū)域,流速切線方向主要為壓強(qiáng)梯度力與摩擦力的平衡,而在法線方向則為地轉(zhuǎn)平衡;在近場切線方向主要為平流項(xiàng)、壓力梯度項(xiàng)與摩擦力項(xiàng)的平衡,而法線方向則主要為壓強(qiáng)梯度力與離心力之間的平衡,科氏力項(xiàng)可忽略不計,這與中緯度大河口的近場動力特征具有明顯不同。
[Abstract]:The plume characteristics of the small estuary and the big estuary are obviously different, and they are more controlled by the changes of wind and runoff. Taking Boao Wanquan River estuary in Hainan as an example, the seasonal variation characteristics of estuarine plume and the influence of flood on estuary plume are studied in this paper. The momentum equilibrium method is used to analyze the dynamic characteristics of the plume at the mouth of Wanquan River. The results show that the plume in the mouth of Wanquan River has a significant seasonal variation. The plume spreading path and range are mainly controlled by runoff and wind. In summer, the plume extends to the offshore and upstream direction (relative to the propagation direction of Kelvin wave). In winter, it extends downstream. The plume range in summer is larger than that in winter. The range of plume and salinity can be greatly affected by a flood of nearly 2 days, and the range of salinity decrease by 1 鈥，

本文編號：2003515