Publication
Title
Flow interaction with dynamic vegetation patches : implications for biogeomorphic evolution of a tidal landscape
Author
Abstract
Feedback between vegetation growth, water flow, and landform is important for the biogeomorphic evolution of many landscapes, such as tidal marshes, alluvial rivers, and hillslopes. While experimental studies often focus on flow reduction within static homogeneous vegetation, we concentrate on flow acceleration around and between dynamically growing vegetation patches that colonize an initially bare landscape, with specific application to Spartina anglica, a pioneer of intertidal flats. Spartina patches were placed in a large-scale flow facility of 16 × 26 m, simulating the growth of two vegetation patches by increasing the patch diameter (D = 13 m) and decreasing the interpatch distance (d = 2.30 m). We quantified that the amount of flow acceleration next to vegetation patches, and the distance from the patch where maximum flow acceleration occurs, increases with increasing patch size. In between the patches, the accelerated flow pattern started to interact as soon as D/d ≥ 0.430.67. As the patches grew further, the flow acceleration increased until D/d ≥ 6.6710, from which the flow acceleration between the patches was suppressed, and the two patches started to act as one. These findings are in accordance with theory on flow around and between nonpermeable structures; however, the threshold D/d values found here for permeable vegetation patches are higher than those for nonpermeable structures. The reported flow interactions with dynamic vegetation patches will be essential to further understanding of the larger-scale biogeomorphic evolution of landscapes formed by flowing water, such as tidal flats, floodplain rivers, and hillslopes.
Language
English
Source (journal)
Journal of geophysical research / American Geophysical Union [Washington, D.C.] - Richmond, Va, 1949 - 2012
Publication
Richmond, Va : 2011
ISSN
0148-0227 [print]
2156-2202 [online]
0022-1406 [cancelled]
0196-6928 [cancelled]
0196-6936 [cancelled]
0885-3401 [cancelled]
8755-8556 [cancelled]
0196-2256 [cancelled]
0747-7309 [cancelled]
1934-8592 [cancelled]
1934-8843 [cancelled]
Volume/pages
116(2011), p. F01008,1-F01008,13
Article Reference
F01008
ISI
000287520200001
Medium
E-only publicatie
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 25.02.2011
Last edited 04.11.2017
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