A numerical study on salinity stratification at the Oujiang River Estuary, China

作     者：Yichun Li Jingui Liu 

作者机构：College of Civil Engineering and ArchitectureBeibu Gulf UniversityQinzhou 535011China Key Laboratory of Research on Marine Hazards ForecastingNational Marine Environmental Forecasting CenterBeijing 100081China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2019年第38卷第11期

页      面：40-50页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：The National Key Research and Development Program of China under contract No.2016YFC1401802 

主　　题：stratification the Oujiang River Estuary FVCOM Macrotidal Estuary potential energy anomaly 

摘      要：The Oujiang River Estuary(ORE)is a macrotidal estuary with drastic variation of river discharge and large tidal *** simulations based on the unstructured grid,Finite-Volume,primitive equation Community Ocean Model(FVCOM)are conducted to investigate the intratidal and intertidal variations of salinity with an extremely upstream river boundary and large computational *** dynamic equation of potential energy anomaly is adopted to evaluate the stratification and mixing processes from model ***,the stability of estuarine stratification on different timescales and its spatial variation are studied using estuarine Richardson number and stratification *** critical values of tidal range and river discharge that determine the stratification state are *** critical values exhibit distinct spatial *** north branch of the ORE exhibits well-mixed conditions when the tidal range exceeds 3.8,4.0 and 4.6m at upper inlet,middle segment and the river mouth,*** river discharge is below 280 m^3/s or exceeds 510 m^3/s,the upper part of the north branch is well-mixed *** the river mouth,river discharge of 280 m^3/s is a rough critical value that separates well-mixed and stratified *** is also concluded that periodic stratification exists in the North *** lower estuary appears to be partially stratified at early ebb or early flood tide,and well-mixed in other tidal *** stratification only develops during early ebb in the upper *** enhancement of stratification is mainly caused by longitudinal advection and lateral velocity shear,while turbulent mixing and longitudinal tidal strain are the main factors of stratification attenuation.