水道港口2024，Vol.45Issue(6)：851-858,8.
寒潮对长江口北槽与附近海域水沙交换影响研究
Study on influence of cold-air front on water and sediment exchange between the north passage of the Changjiang River Estuary and adjacent sea areas
摘要
Abstract
In order to investigate the characteristics of water and sediment exchange between the North Passage(NP)and adjacent sea areas in the Changjiang River Estuary(CRE)under cold-air fronts,events of cold-air fronts were statistical analyzed during 20 years.A three-dimensional flow-wave-sediment coupling model was established to simulate the influence of cold-air fronts with varying paths and intensities on the dynamics,suspended sediment,and water and sediment transport between the NP and the nearby sea areas.The results show that the frequency of cold-air fronts affecting the CRE in the east path and middle path is comparable and less than half that observed in the west path.The range of wind speeds during the west-path cold-air fronts is large,with both weak and extremely strong cold-air fronts occurring,while the range of wind speeds during the middle-path and east-path cold-air fronts is small,with cold-air fronts of magnitudes 7 and 8 being dominant.The cold-air fronts significantly increase the bottom shear stress on shallow shoals near the NP and beyond its mouth,increasing the suspended sediment concentration(SSC)in the water.This high-concentration sediment is then transported into the NP by currents,leading to an increase in the SSC of the NP.The influence of cold-air fronts in the west path on water and sediment transport near the NP is obviously weaker than that in the east path and middle path,due to limitations imposed by wind blowing distance.The intensity of cold-air fronts in different paths is always the key factor affecting the SSC and suspended sediment inflow in the NP.With the increase of wind speed,the total sediment inflow in the NP increases significantly.关键词
长江口北槽/寒潮路径/寒潮强度/数值模拟/水沙输运Key words
North Passage of the Changjiang River/cold-air front path/cold-air front intensity/numerical simulation/water and sediment transport分类
交通工程引用本文复制引用
华厦,陆杨,张磊,陈大可,徐岢..寒潮对长江口北槽与附近海域水沙交换影响研究[J].水道港口,2024,45(6):851-858,8.基金项目
国家重点研发计划项目(2017YFC0405400) （2017YFC0405400）
南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金项目(Y222006 （）
Y223002) （）
长江科学院开放研究基金资助项目(CKWV20221007/KY) （CKWV20221007/KY）
