Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2013349118 |
Stochastic dynamics of barrier island elevation | |
Orencio Durán Vinent; Benjamin E. Schaffer; Ignacio Rodriguez-Iturbe | |
2021-01-05 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2021 |
英文摘要 | Barrier islands are ubiquitous coastal features that create low-energy 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 high-elevation 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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/309068 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Orencio Durán Vinent,Benjamin E. Schaffer,Ignacio Rodriguez-Iturbe. Stochastic dynamics of barrier island elevation[J]. Proceedings of the National Academy of Science,2021. |
APA | Orencio Durán Vinent,Benjamin E. Schaffer,&Ignacio Rodriguez-Iturbe.(2021).Stochastic dynamics of barrier island elevation.Proceedings of the National Academy of Science. |
MLA | Orencio Durán Vinent,et al."Stochastic dynamics of barrier island elevation".Proceedings of the National Academy of Science (2021). |
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