气候变化领域集成服务门户(CCPortal): The Influence of Channel Deepening on Tides, River Discharge Effects, and Storm Surge

CCPortal

DOI	10.1029/2020JC016328
	The Influence of Channel Deepening on Tides, River Discharge Effects, and Storm Surge
	Talke S.A.; Familkhalili R.; Jay D.A.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	We combine archival research, semi-analytical models, and numerical simulations to address the following question: how do changes to channel geometry alter tidal properties and flood dynamics in a hyposynchronous, strongly frictional estuary with a landward decay in tidal amplitudes? Records in the Saint Johns River Estuary since the 1890s show that tidal range has doubled in Jacksonville, Florida. Near the estuary inlet, tidal discharge approximately doubled but tidal amplitudes increased only ∼6%. Modeling shows that increased shipping channel depths from ∼5 to ∼13m drove the observed changes, with other factors like channel shortening and width reduction producing comparatively minor effects. Tidal amplitude increases are spatially variable, with a maximum change 20–25 km from the estuary inlet; tidal theory suggests that increases in amplitude approximately follow (Formula presented.), where x is the distance from the ocean and μ is a damping coefficient. Tidal changes are a predictor of altered surge dynamics: Numerical modeling of hurricane Irma under 1898 and 2017 bathymetric conditions confirms that both tidal and storm surge amplitudes are larger today, with a similar spatial pattern. Nonetheless, peak water levels are simulated to be larger under 1898 bathymetry. The cause is likely the record river discharge observed during the storm; as suggested by a subtidal water-level model, channel deepening since 1898 appears to have reduced the average surface slope required to drain both mean river flow and storm flows toward the ocean. Nonetheless, results suggest an increased vulnerability to storms with less river flow, but larger storm surge. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Compound flooding; data rescue; flood hazard; river flow; storm surge; tides
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/186305
作者单位	Civil and Environmental Engineering, California Polytechnic State University, San Luis Obispo, CA, United States; Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, United States; Civil and Environmental Engineering, Portland State University, Portland, OR, United States
推荐引用方式 GB/T 7714	Talke S.A.,Familkhalili R.,Jay D.A.. The Influence of Channel Deepening on Tides, River Discharge Effects, and Storm Surge[J],2021,126(5).
APA	Talke S.A.,Familkhalili R.,&Jay D.A..(2021).The Influence of Channel Deepening on Tides, River Discharge Effects, and Storm Surge.Journal of Geophysical Research: Oceans,126(5).
MLA	Talke S.A.,et al."The Influence of Channel Deepening on Tides, River Discharge Effects, and Storm Surge".Journal of Geophysical Research: Oceans 126.5(2021).