The random redistribution of sediment by wind in a lak

Research output: Contribution to journalArticle

Abstract

The total sedimentation rate was measured fortnightly for a year in a large shallow lake (Lough Neagh, Northern Ireland, surface area 383 km(2), mean depth 8.9 m) at five sites using 10 sediment traps. The total sedimentation rate included both primary and secondary sedimentation. As the annual average total sedimentation rate, 53.2 +/- 44.1 g m(-2) d(-1), is more than 25 times the primary value, secondary sedimentation due to wind-induced resuspension is very important. The average of the largest 30% of wave mixed layer (WML) values, a function of wind speed and effective fetch, strongly correlates with the total sedimentation rate (r(2) values of 0.69 and 0.98 at two westerly sites) at most of the sites. As the WML value approaches the water depth, then the orbital motion of the waves and the associated turbulence cause sediment disturbance and resuspension. Changing WML values, then, provide a basis to describe the ``random redistribution'' (RR) of sediment in lakes and these resuspension events can occur as frequently as 2-3 times every two weeks. This study provides, for the first time, clear results and a description of the process of RR of sediment in a lake, particularly the link between wind and sediment resuspension.
LanguageEnglish
Pages686-694
JournalLimnology and Oceanography
Volume45
Issue number3
Publication statusPublished - May 2000

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resuspension
sedimentation rate
mixed layer
sediment
lake
sedimentation
fetch
sediment trap
westerly
water depth
surface area
wind velocity
turbulence
disturbance

Cite this

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title = "The random redistribution of sediment by wind in a lak",
abstract = "The total sedimentation rate was measured fortnightly for a year in a large shallow lake (Lough Neagh, Northern Ireland, surface area 383 km(2), mean depth 8.9 m) at five sites using 10 sediment traps. The total sedimentation rate included both primary and secondary sedimentation. As the annual average total sedimentation rate, 53.2 +/- 44.1 g m(-2) d(-1), is more than 25 times the primary value, secondary sedimentation due to wind-induced resuspension is very important. The average of the largest 30{\%} of wave mixed layer (WML) values, a function of wind speed and effective fetch, strongly correlates with the total sedimentation rate (r(2) values of 0.69 and 0.98 at two westerly sites) at most of the sites. As the WML value approaches the water depth, then the orbital motion of the waves and the associated turbulence cause sediment disturbance and resuspension. Changing WML values, then, provide a basis to describe the ``random redistribution'' (RR) of sediment in lakes and these resuspension events can occur as frequently as 2-3 times every two weeks. This study provides, for the first time, clear results and a description of the process of RR of sediment in a lake, particularly the link between wind and sediment resuspension.",
author = "RW Douglas and B Rippey",
year = "2000",
month = "5",
language = "English",
volume = "45",
pages = "686--694",
number = "3",

}

The random redistribution of sediment by wind in a lak. / Douglas, RW; Rippey, B.

Vol. 45, No. 3, 05.2000, p. 686-694.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The random redistribution of sediment by wind in a lak

AU - Douglas, RW

AU - Rippey, B

PY - 2000/5

Y1 - 2000/5

N2 - The total sedimentation rate was measured fortnightly for a year in a large shallow lake (Lough Neagh, Northern Ireland, surface area 383 km(2), mean depth 8.9 m) at five sites using 10 sediment traps. The total sedimentation rate included both primary and secondary sedimentation. As the annual average total sedimentation rate, 53.2 +/- 44.1 g m(-2) d(-1), is more than 25 times the primary value, secondary sedimentation due to wind-induced resuspension is very important. The average of the largest 30% of wave mixed layer (WML) values, a function of wind speed and effective fetch, strongly correlates with the total sedimentation rate (r(2) values of 0.69 and 0.98 at two westerly sites) at most of the sites. As the WML value approaches the water depth, then the orbital motion of the waves and the associated turbulence cause sediment disturbance and resuspension. Changing WML values, then, provide a basis to describe the ``random redistribution'' (RR) of sediment in lakes and these resuspension events can occur as frequently as 2-3 times every two weeks. This study provides, for the first time, clear results and a description of the process of RR of sediment in a lake, particularly the link between wind and sediment resuspension.

AB - The total sedimentation rate was measured fortnightly for a year in a large shallow lake (Lough Neagh, Northern Ireland, surface area 383 km(2), mean depth 8.9 m) at five sites using 10 sediment traps. The total sedimentation rate included both primary and secondary sedimentation. As the annual average total sedimentation rate, 53.2 +/- 44.1 g m(-2) d(-1), is more than 25 times the primary value, secondary sedimentation due to wind-induced resuspension is very important. The average of the largest 30% of wave mixed layer (WML) values, a function of wind speed and effective fetch, strongly correlates with the total sedimentation rate (r(2) values of 0.69 and 0.98 at two westerly sites) at most of the sites. As the WML value approaches the water depth, then the orbital motion of the waves and the associated turbulence cause sediment disturbance and resuspension. Changing WML values, then, provide a basis to describe the ``random redistribution'' (RR) of sediment in lakes and these resuspension events can occur as frequently as 2-3 times every two weeks. This study provides, for the first time, clear results and a description of the process of RR of sediment in a lake, particularly the link between wind and sediment resuspension.

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