DOI: 10.1002/2017JC013145
Scopus记录号: 2-s2.0-85045960223
论文题名: Fragmented Canopies Control the Regimes of Gravity Current Development
作者: Barcelona A. ; Serra T. ; Colomer J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 3 起始页码: 1631
结束页码: 1646
语种: 英语
英文关键词: drag-dominated
; emergent vegetation
; fragmented vegetation
; gravity current
Scopus关键词: canopy
; climate change
; coastal zone
; current velocity
; drag
; ecosystem dynamics
; emergence
; experimental study
; gap dynamics
; gravity survey
; hydrodynamics
; runoff
; salinity
; sedimentation
; vegetation dynamics
; wetland
英文摘要: Coastal ecosystems (marine littoral regions, wetlands, and deltas) are regions of high biological productivity. However, they are also one of the world's most threatened ecosystems. Wetlands are characterized by aquatic vegetation adapted to high salinity levels and climatic variations. Wetland canopies buffer these hydrodynamic and atmospheric variations and help retain sediment by reducing current velocity during sea storms or runoff after periods of rain. This work focuses on the effect of the presence of a gap (i.e., nonvegetated zone) parallel to the direction of the main current has on the sedimentation and hydrodynamics of a gravity current. The study aims to (1) address the behavior of a gravity current in a vegetated region compared to one without vegetation (i.e., the gap), (2) determine the effect gap size has on how a gravity current evolves, and 3) determine the effect gap sizes have on the sedimentary rates from a gravity current. Laboratory experiments were carried out in a flume using four different sediment concentrations, four different canopy densities (884, 354, 177, and 0 plants·m−2) and three different gap widths (H/2, H, and 1.5H, where H is the height of the water). This work shows that a gravity current's evolution and its sedimentary rates depend on the fractional volume occupied by the vegetation. While current dynamics in experiments with wider gaps are similar to the nonvegetated case, for smaller gaps the dynamics are closer to the fully vegetated case. Nonetheless, the gravity current exhibits the same behavior in both the vegetated region and the gap. © 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/114403
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Girona, Girona, Spain
Recommended Citation:
Barcelona A.,Serra T.,Colomer J.. Fragmented Canopies Control the Regimes of Gravity Current Development[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(3)