DOI: 10.1073/pnas.2013349118
论文题名: Stochastic dynamics of barrier island elevation
作者: Vinent O.D. ; Schaffer B.E. ; Rodriguez-Iturbe I.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2021
卷: 118, 期: 1 语种: 英语
英文关键词: Barrier islands
; Coastal dunes
; Master equation
; Stochastic dynamics
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163884
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Vinent O.D.,Schaffer B.E.,Rodriguez-Iturbe I.. Stochastic dynamics of barrier island elevation[J]. Proceedings of the National Academy of Sciences of the United States of America,2021-01-01,118(1)