气候变化领域集成服务门户(CCPortal): Stochastic dynamics of barrier island elevation

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DOI	10.1073/pnas.2013349118
	Stochastic dynamics of barrier island elevation
	Vinent O.D.; Schaffer B.E.; Rodriguez-Iturbe I.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:1
英文摘要	Barrier islands are ubiquitous coastal features that create lowenergy environments where salt marshes, oyster reefs, and mangroves can develop and survive external stresses. Barrier systems also protect interior coastal communities from storm surges and wave-driven erosion. These functions depend on the existence of a slowly migrating, vertically stable barrier, a condition tied to the frequency of storm-driven overwashes and thus barrier elevation during the storm impact. The balance between erosional and accretional processes behind barrier dynamics is stochastic in nature and cannot be properly understood with traditional continuous models. Here we develop a master equation describing the stochastic dynamics of the probability density function (PDF) of barrier elevation at a point. The dynamics are controlled by two dimensionless numbers relating the average intensity and frequency of high-water events (HWEs) to the maximum dune height and dune formation time, which are in turn a function of the rate of sea level rise, sand availability, and stress of the plant ecosystem anchoring dune formation. Depending on the control parameters, the transient solution converges toward a highelevation barrier, a low-elevation barrier, or a mixed, bimodal, state. We find the average after-storm recovery time-a relaxation time characterizing barrier's resiliency to storm impacts- changes rapidly with the control parameters, suggesting a tipping point in barrier response to external drivers. We finally derive explicit expressions for the overwash probability and average overwash frequency and transport rate characterizing the landward migration of barriers. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Barrier islands; Coastal dunes; Master equation; Stochastic dynamics
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160673
作者单位	Vinent, O.D., Department of Ocean Engineering, Texas A&M University, College Station, TX 77843-3136, United States; Schaffer, B.E., Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08540, United States; Rodriguez-Iturbe, I., Department of Ocean Engineering, Texas A&M University, College Station, TX 77843-3136, United States
推荐引用方式 GB/T 7714	Vinent O.D.,Schaffer B.E.,Rodriguez-Iturbe I.. Stochastic dynamics of barrier island elevation[J],2021,118(1).
APA	Vinent O.D.,Schaffer B.E.,&Rodriguez-Iturbe I..(2021).Stochastic dynamics of barrier island elevation.Proceedings of the National Academy of Sciences of the United States of America,118(1).
MLA	Vinent O.D.,et al."Stochastic dynamics of barrier island elevation".Proceedings of the National Academy of Sciences of the United States of America 118.1(2021).