气候变化领域集成服务门户(CCPortal): Land loss due to human-altered sediment budget in the Mississippi River Delta

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DOI	10.1038/s41893-023-01081-0
	Land loss due to human-altered sediment budget in the Mississippi River Delta
	Edmonds, Douglas A. A.; Toby, Stephan C. C.; Siverd, Christopher G. G.; Twilley, Robert; Bentley, Samuel J. J.; Hagen, Scott; Xu, Kehui
发表日期	2022
ISSN	2398-9629
页码	10
英文摘要	Land loss in the Mississippi River Delta is due to the human-altered sediment budget, yet the relative contributions of building dams, levees and extracting subsurface resources are unknown. Here, using numerical models, we show how each cause contributed to the land loss crisis in Barataria Basin within the Mississippi River Delta. Before human interference, Barataria Basin had a sediment budget surplus, and the excess sediment would have grown the wetlands at 7-13 km(2) yr(-1). Dam building in the Mississippi River basin decreased overbank fluvial sediment deposition in Barataria by a third, yet the basin-wide sediment surplus persisted. The installation of flood-protection levees eliminated overbank sediment deposition and created an annual basin-wide sediment deficit, leading to land loss of 7 km(2) yr(-1). During its peak, subsurface resource extraction enhanced the deficit and doubled the land loss rates. Our findings show that these three causes can explain the land loss crisis, and the recent slowdown in land loss is linked to the declining rate of resource extraction. Finally, we find that the effect of dams is secondary to levees and resource extraction, which implies that sediment supply reduction may not be as detrimental to sediment diversions and coastal restoration as previously thought. Coastal deltas around the world have been losing land and disagreement on the extent of anthropogenic causes is rife. A balanced sediment budget for the Mississippi River Delta shows that the impact of levees and resource extraction have been the dominant drivers of land loss within Barataria Basin.
学科领域	Green & Sustainable Science & Technology; Environmental Sciences; Environmental Studies
语种	英语
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
WOS记录号	WOS:000943957300006
来源期刊	NATURE SUSTAINABILITY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272871
作者单位	Indiana University System; Indiana University Bloomington; Louisiana State University System; Louisiana State University; Louisiana State University System; Louisiana State University; Louisiana State University System; Louisiana State University; Louisiana State University System; Louisiana State University
推荐引用方式 GB/T 7714	Edmonds, Douglas A. A.,Toby, Stephan C. C.,Siverd, Christopher G. G.,et al. Land loss due to human-altered sediment budget in the Mississippi River Delta[J],2022:10.
APA	Edmonds, Douglas A. A..,Toby, Stephan C. C..,Siverd, Christopher G. G..,Twilley, Robert.,Bentley, Samuel J. J..,...&Xu, Kehui.(2022).Land loss due to human-altered sediment budget in the Mississippi River Delta.NATURE SUSTAINABILITY,10.
MLA	Edmonds, Douglas A. A.,et al."Land loss due to human-altered sediment budget in the Mississippi River Delta".NATURE SUSTAINABILITY (2022):10.