DOI: 10.1038/NGEO2233
论文题名: Optimum vegetation height and density for inorganic sedimentation in deltaic marshes
作者: Nardin W. ; Edmonds D.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 10 起始页码: 722
结束页码: 726
语种: 英语
Scopus关键词: delta
; deltaic sedimentation
; hydrodynamics
; inorganic matter
; marsh
; multiple regression
; numerical model
; vegetation
; Atchafalaya Delta
; Louisiana
; United States
; Wax Lake Delta
英文摘要: River deltas support a disproportionate percentage of the world's population and some are drowning as sea level rises1. Resilient deltas theoretically balance relative sea-level rise with vertical growth from surface sedimentation2-7. Vegetation generally enhances inorganic sedimentation and resiliency in some settings, such as tidal saltwater marshes8, but the effect of vegetation on freshwater marshes in river deltas is less clear. Here we use a hydrodynamic numerical model9 to simulate deposition in a river delta with varying vegetation characteristics and water discharge and show that vegetation does not always enhance sedimentation on a freshwater marsh. For a given flood, we find that intermediate vegetation height and density are optimal for enhancing both sand and mud deposition, whereas tall or dense vegetation causes sand to remain in the river channel, reducing marsh sedimentation. A multivariate regression analysis of remote-sensing data from Wax Lake Delta, Louisiana, USA shows that the delta exhibits a hydrodynamic response to vegetation in agreement with model predictions. Because most sediment is delivered to freshwater deltaic marshes by infrequent storm and flood events, we further suggest that the timing of such events relative to seasonal vegetation growth determines the integrated effect of vegetation on delta resiliency. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106406
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Indiana University, Department of Geological Sciences, Center for Geospatial Data Analysis, Bloomington, IN, United States; Boston University, Department of Earth and Environment, Boston, MA, United States
Recommended Citation:
Nardin W.,Edmonds D.A.. Optimum vegetation height and density for inorganic sedimentation in deltaic marshes[J]. Nature Geoscience,2014-01-01,7(10)