NDLI: Effects of a sharp change of emergent vegetation distributions on thermally driven flow over a slope

Content Provider	Springer Nature Link
Author	Lin, Ying Tien Wu, Chin H.
Copyright Year	2014
Abstract	In this study, thermally driven flow within a sharp change of rooted emergent vegetation distributions is discussed. A conceptual and linear model is developed to study the interferences and competitions between two forcing mechanisms (vegetation shading and sloping bottom effects) on circulation patterns. The two forcing mechanisms can counteract or reinforce each other according to the presence of emergent vegetation in shallow or deep regions. For tall vegetation in shallows and open water in deep regions, vegetation shading leads to opposite temperature gradients against those from a slope. A critical vegetation blockage $$B_{\textit{critical}}$$ is found to cause a minimum horizontal exchange flowrate and divide the flow regime as topographic or vegetation shading dominated. In clear water, opposite circulation from the bottom is produced and gradually spreads to the whole water column. On the contrary, in turbid water, the opposite circulation emerges from the water surface and gradually propagates to the sloping bottom. The circulation in turbid water is more easily affected by a sharp change of vegetation distributions rather than clear water. For open in shallows and tall vegetation in deep water, pressure gradients from vegetation shading can enhance buoyancy from the sloping bottom and lead to greater horizontal exchange flowrates. Due to a sharp change of emergent vegetation distributions, horizontal exchange flowrates are possibly increased and greater than those without vegetation. In short, circulation patterns and strength can be significantly affected by a sharp change of emergent vegetation distributions.
Starting Page	771
Ending Page	791
Page Count	21
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	15
Issue Number	4
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-08-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Vegetation distribution Vegetation shading Rooted and emergent Sloping bottom Stratified environments Earth Sciences Environmental Physics Hydrology/Water Resources Mechanics Hydrogeology Oceanography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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