气候变化领域集成服务门户(CCPortal): The Future of Developed Barrier Systems: 2. Alongshore Complexities and Emergent Climate Change Dynamics

CCPortal

DOI	10.1029/2023EF004200
	The Future of Developed Barrier Systems: 2. Alongshore Complexities and Emergent Climate Change Dynamics
	Anarde, K. A.; Moore, L. J.; Murray, A. B.; Reeves, I. R. B.
发表日期	2024
EISSN	2328-4277
起始页码	12
结束页码	4
卷号	12 期号:4
英文摘要	Developed barrier systems (barrier islands and spits) are lowering and narrowing with sea-level rise (SLR) such that habitation will eventually become infeasible or prohibitively expensive for most communities in its current form. Before reaching this state, choices will be made to modify the natural and built environment to reduce relatively short-term risk. These choices will likely vary substantially even along the same developed barrier system as these landscapes are rarely uniformly managed alongshore. Building on the results from a companion paper, here we use a new modeling framework to investigate the complexities in barrier system dynamics that emerge as a function of alongshore variability in management strategies, accelerations in SLR, and changes in storm intensity and frequency. Model results suggest that when connected through alongshore sediment transport, barriers with alongshore variable management strategies-here, the construction of dunes and wide beaches to protect either roadways or communities-evolve differently than they would in the absence of alongshore connections. Shoreline stabilization by communities in one location influences neighboring areas managed solely for roadways, inducing long-term system-wide lags in shoreline retreat. Conversely, when barrier segments managed for roadways are allowed to overwash, this induces shoreline curvature system-wide, thus enhancing erosion on nearby stabilized segments. Feedbacks between dunes, storms, overwash flux, and alongshore sediment transport also affect outcomes of climate adaptation measures. In the case of partial, early abandonment of roadway management, we find that system-wide transitions to less vulnerable landscape states are possible, even under accelerated SLR and increased storminess. Because humans inhabit barrier islands and spits (collectively referred to as barriers) these landscapes, that would otherwise naturally change shape in response to storms and sea-level rise (SLR), are influenced by efforts to protect development with wide beaches and tall dunes. These features interfere with a process called overwash, which transports sand landward during storms, building barrier elevation relative to sea level. Here, we use a new model to better understand how these interactions influence the habitability of barriers over time. Our simulations show that different management decisions made for adjacent coastal segments affect each other in positive and negative ways. When communities nourish beaches, adjacent to segments managed for roadways, some nourished sand reaches the adjacent segments, reducing shoreline erosion there. Conversely, portions of barriers that are managed only for roadways allow some overwash to reach the barrier interior; this negatively affects neighboring communities by enhancing their shoreline erosion rates. We find that early abandonment of dune management along portions of barriers may prevent highly vulnerable future states, such as barrier drowning. As communities explore choices for climate adaptation, our findings reveal the importance of coordination among decision makers in adjacent communities to avoid undesirable outcomes. When management strategies vary alongshore, their effects are coupled via alongshore sediment redistribution, influencing barrier evolution Beach nourishment (along portions of barriers) induces system-wide lags in shoreline retreat, even decades after nourishment practices cease More overwash (due to lower dunes or increased storminess) can prolong habitability, but drives increased nourishment frequency elsewhere
英文关键词	barrier islands; coastal morphodynamics; coastal management; coupled human-natural dynamics; sea-level rise; long-term coastal change
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001198604000001
来源期刊	EARTHS FUTURE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306761
作者单位	University of North Carolina School of Medicine; University of North Carolina; University of North Carolina Chapel Hill; North Carolina State University; Duke University; United States Department of the Interior; United States Geological Survey
推荐引用方式 GB/T 7714	Anarde, K. A.,Moore, L. J.,Murray, A. B.,et al. The Future of Developed Barrier Systems: 2. Alongshore Complexities and Emergent Climate Change Dynamics[J],2024,12(4).
APA	Anarde, K. A.,Moore, L. J.,Murray, A. B.,&Reeves, I. R. B..(2024).The Future of Developed Barrier Systems: 2. Alongshore Complexities and Emergent Climate Change Dynamics.EARTHS FUTURE,12(4).
MLA	Anarde, K. A.,et al."The Future of Developed Barrier Systems: 2. Alongshore Complexities and Emergent Climate Change Dynamics".EARTHS FUTURE 12.4(2024).