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Density-driven current between reed belts and open water in a shallow lake

Borell Lövstedt, Charlotta LU and Bengtsson, Lars LU (2008) In Water Resources Research 44(10).
Abstract
Differential heating of surface waters of lakes caused by shading from vegetation can induce convection, which could be significant for the ecosystem because the chemistry and biology can differ in the reed belt zone compared to the open lake. This process has been given little attention in the literature. In the present study surface currents just outside a reed belt as well as radiation and water temperature profiles within and outside the vegetated belt were measured in a shallow lake in southern Sweden to determine the lateral flux between the two zones. The measured surface current directed toward the vegetation was about 1 cm/s. Net radiation at the water surface was 85% lower within the vegetation than in the open lake. The water... (More)
Differential heating of surface waters of lakes caused by shading from vegetation can induce convection, which could be significant for the ecosystem because the chemistry and biology can differ in the reed belt zone compared to the open lake. This process has been given little attention in the literature. In the present study surface currents just outside a reed belt as well as radiation and water temperature profiles within and outside the vegetated belt were measured in a shallow lake in southern Sweden to determine the lateral flux between the two zones. The measured surface current directed toward the vegetation was about 1 cm/s. Net radiation at the water surface was 85% lower within the vegetation than in the open lake. The water surface temperature during sunny days was on average 0.5 degrees C warmer outside the reed belt, and at maximum 1 degrees C warmer. The lateral heat flux from the open water into the water within the reeds was estimated to similar to 200 W/m(2) during midday on sunny days, which corresponded to a calculated maximum current of 1.5 cm/s. This current between the open water and the reed vegetation is presumably the main water exchange process between the two zones during sunny summer days with low wind speeds. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Resources Research
volume
44
issue
10
publisher
American Geophysical Union
external identifiers
  • wos:000260389400003
  • scopus:57149088843
ISSN
0043-1397
DOI
10.1029/2008WR006949
language
English
LU publication?
yes
id
a2c4ac55-384d-423e-8ebf-8af75d782501 (old id 1283744)
date added to LUP
2009-02-10 09:58:54
date last changed
2017-09-10 04:04:33
@article{a2c4ac55-384d-423e-8ebf-8af75d782501,
  abstract     = {Differential heating of surface waters of lakes caused by shading from vegetation can induce convection, which could be significant for the ecosystem because the chemistry and biology can differ in the reed belt zone compared to the open lake. This process has been given little attention in the literature. In the present study surface currents just outside a reed belt as well as radiation and water temperature profiles within and outside the vegetated belt were measured in a shallow lake in southern Sweden to determine the lateral flux between the two zones. The measured surface current directed toward the vegetation was about 1 cm/s. Net radiation at the water surface was 85% lower within the vegetation than in the open lake. The water surface temperature during sunny days was on average 0.5 degrees C warmer outside the reed belt, and at maximum 1 degrees C warmer. The lateral heat flux from the open water into the water within the reeds was estimated to similar to 200 W/m(2) during midday on sunny days, which corresponded to a calculated maximum current of 1.5 cm/s. This current between the open water and the reed vegetation is presumably the main water exchange process between the two zones during sunny summer days with low wind speeds.},
  author       = {Borell Lövstedt, Charlotta and Bengtsson, Lars},
  issn         = {0043-1397},
  language     = {eng},
  number       = {10},
  publisher    = {American Geophysical Union},
  series       = {Water Resources Research},
  title        = {Density-driven current between reed belts and open water in a shallow lake},
  url          = {http://dx.doi.org/10.1029/2008WR006949},
  volume       = {44},
  year         = {2008},
}