DOI: 10.1029/2017JG004358
Scopus记录号: 2-s2.0-85052372625
论文题名: Lateral Marsh Edge Erosion as a Source of Sediments for Vertical Marsh Accretion
作者: Hopkinson C.S. ; Morris J.T. ; Fagherazzi S. ; Wollheim W.M. ; Raymond P.A.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2444
结束页码: 2465
语种: 英语
英文关键词: erosion
; organic carbon
; salt marsh accretion
; sea-level rise
; sediment
; watershed
Scopus关键词: Prunus domestica
英文摘要: With sea level rise accelerating and sediment inputs to the coast declining worldwide, there is concern that tidal wetlands will drown. To better understand this concern, sources of sediment contributing to marsh elevation gain were computed for Plum Island Sound estuary, MA, USA. We quantified input of sediment from rivers and erosion of marsh edges. Maintaining elevation relative to the recent sea level rise rate of 2.8 mm yr−1 requires input of 32,299 MT yr−1 of sediment. The input from watersheds is only 3,210 MT yr−1. Marsh edge erosion, based on a comparison of 2005 and 2011 LiDAR data, provides 10,032 MT yr−1. This level of erosion is met by <0.1% of total marsh area eroded annually. Mass balance suggests that 19,070 MT yr−1 should be of tidal flat or oceanic origin. The estuarine distribution of 14C and 13C isotopes of suspended particulate organic carbon confirms the resuspension of ancient marsh peat from marsh edge erosion, and the vertical distribution of 14C-humin material in marsh sediment is indicative of the deposition of ancient organic carbon on the marsh platform. High resuspension rates in the estuarine water column are sufficient to meet marsh accretionary needs. Marsh edge erosion provides an important fraction of the material needed for marsh accretion. Because of limited sediment supply and sea level rise, the marsh platform maintains elevation at the expense of total marsh area. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113457
Appears in Collections: 气候减缓与适应
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States; Belle Baruch Institute for Marine and Coastal Studies, University of South Carolina, Columbia, SC, United States; Department of Earth and Environment, Boston University, Boston, MA, United States; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States; School of Forestry and Environmental Studies, Yale University, New Haven, CT, United States
Recommended Citation:
Hopkinson C.S.,Morris J.T.,Fagherazzi S.,et al. Lateral Marsh Edge Erosion as a Source of Sediments for Vertical Marsh Accretion[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)