气候变化领域集成服务门户(CCPortal): Numerical Experiments on Variation of Freshwater Plume and Leakage Effect From Mississippi River Diversion in the Lake Pontchartrain Estuary

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DOI	10.1029/2019JC015282
	Numerical Experiments on Variation of Freshwater Plume and Leakage Effect From Mississippi River Diversion in the Lake Pontchartrain Estuary
	Huang W.; Li C.; White J.R.; Bargu S.; Milan B.; Bentley S.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	A Finite Volume Community Ocean Model is used to investigate how wind impacts the circulation and evolution of a freshwater plume from Mississippi River diversion in the Lake Pontchartrain Estuary. Results show that northerly and southerly winds tend to stretch the plume in the east-west directions, while easterly and westerly winds constrain the plume in the north-south directions. Increasing wind magnitude tends to increase the total salt content of the estuary except under weak westerly wind (<6 m/s) during which salt content decreases. A no-motion middepth interface is found (by the model and verified by the data), separating the top layer downwind flow and bottom layer upwind flow. Increasing wind magnitude can enhance the two-layered flows and lower the no-motion plane between the two opposite flows. Apparent small leakage of the river water through the diversion structure prior to its opening is found to impact the vertical structure of flows and salinity: Mixing is facilitated by the large amount of freshwater leaked into the lake prior to the opening of the diversion; wind-driven gyres are diminished; the average potential energy demand, a quantity used to measure the vertical stratification, is reduced to very low values; more deviation from the quasi-steady state balance tends to occur; and a total of 3.7 × 108 kg of salt is reduced during the opening period of the Bonnet Carré Spillway. The Lake Pontchartrain Estuary is completely dominated by the river water within about 25 days, when salinity drops from an average value of 4 g/kg to essentially zero. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	cold fronts; counter-wind flows; freshwater diversion; FVCOM modeling; leakage from diversion structure; no-motion plane
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186974
作者单位	Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA, United States; Coastal Studies Institute, Louisiana State University, Baton Rouge, LA, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, United States
推荐引用方式 GB/T 7714	Huang W.,Li C.,White J.R.,et al. Numerical Experiments on Variation of Freshwater Plume and Leakage Effect From Mississippi River Diversion in the Lake Pontchartrain Estuary[J],2020,125(2).
APA	Huang W.,Li C.,White J.R.,Bargu S.,Milan B.,&Bentley S..(2020).Numerical Experiments on Variation of Freshwater Plume and Leakage Effect From Mississippi River Diversion in the Lake Pontchartrain Estuary.Journal of Geophysical Research: Oceans,125(2).
MLA	Huang W.,et al."Numerical Experiments on Variation of Freshwater Plume and Leakage Effect From Mississippi River Diversion in the Lake Pontchartrain Estuary".Journal of Geophysical Research: Oceans 125.2(2020).