Dynamics of Lakes, Reservoirs, and Cooling Ponds

Imberger, Jörg; Hamblin, P. F.

doi:10.1146/annurev.fl.14.010182.001101

Cited by 318 publications

(185 citation statements)

References 66 publications

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“…5 that maximum exchange velocity at the end of the effective slope (u 11~5 .5 cm s -1 at 6 a.m. of the third day) is only 1.6 times larger than the maximum near-bottom velocity at the depth of 26 m (u 26~3 .5 cm s -1 at 6 pm of the third day), which is 2.4 times deeper and 1.4L further off-shore (L is the length of the effective slope). Both in lakes and the ocean, such horizontal isopycnal exchange is well known as a mechanism which transports littoral waters very far from the coast (Imberger and Hamblin, 1982;Thorpe, 1998).…”

Section: Instant Flow Featuresmentioning

confidence: 99%

Down-slope cascading modulated by day/night variations of solar heating

et al. 2013

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Section: Instant Flow Featuresmentioning

confidence: 99%

Down-slope cascading modulated by day/night variations of solar heating

et al. 2013

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“…Data on wind velocity and total daily irradiance at the nearest weather station Cabauw were provided by the Royal Dutch Meteorological Institute . The depth of the surface mixed layer (Zm ) was determined from data on wind speed and depth profiles of temperature, and was calculated as the depth where the Wedderburn number (W) reached unity, as described by Imberger & Hamblin (1982) :…”

Section: Sampling Scheme and Measurementsmentioning

confidence: 99%

Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir

Visser

Ketelaars²,

Breemen³

et al. 1996

Hydrobiologia

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Key words : buoyancy, artificial mixing, aeration, Microcystis, cyanobacteria Abstract In a storage reservoir, which is artificially mixed in order to reduce algal and especially cyanobacterial growth, the cyanobacterium Microcystis is still present . The aim of the research was to investigate why Microcystis was able to grow in the artificially mixed reservoir . From the results it could be concluded that the large shallow area in the reservoir allows this growth . The loss of buoyancy during the day was much higher in this shallow part than in the deep part. Assuming that the loss of buoyancy was the result of a higher carbohydrate content, a higher growth rate in the shallow part may be expected . A higher received light dose by the phytoplankton in the shallow mixed part of the reservoir than in the deep mixed part explains the difference in buoyancy loss . A significant correlation between the received light dose (calculated for homogeneously mixed phytoplankton) and the buoyancy loss was found . Apparently, the Microcystis colonies were entrained in the turbulent flow in both the shallow and the deep part of the reservoir. With a little higher stability on one sampling day, due to the late start of the artificial mixing, the loss of buoyancy at the deep site was higher than on the other days and almost comparable to the loss at the shallow site . Although the vertical biomass distribution and the temperature profiles showed homogeneous mixing, the colonies in the upper layers apparently received a higher light dose than those deeper in the water column . Determination of the buoyancy state of cyanobacteria appeared to be a valuable method to investigate the light history and hence their entrainment in the turbulent flow in the water column .

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“…[5] In terms of energy budget, changes in water temperature indicate changes in the potential energy of the lake, which increases in case of a mixing event [Fischer et al, 1979;Imberger and Hamblin, 1982;Wüest et al, 2000]. Potential energy per unit of area of bed is estimated as the gravity centre elevation times the total mass of the water column Antenucci et al, 2000]; therefore, since the deepest waters are denser in stratified conditions, the gravity centre is deeper than in homogenous conditions, thus being required an external source of energy to induce vertical mixing [Fischer et al, 1979;Imberger and Hamblin, 1982;Wüest et al, 2000].…”

Section: Field Measurements and Mixing Characterizationmentioning

confidence: 99%

“…Potential energy per unit of area of bed is estimated as the gravity centre elevation times the total mass of the water column Antenucci et al, 2000]; therefore, since the deepest waters are denser in stratified conditions, the gravity centre is deeper than in homogenous conditions, thus being required an external source of energy to induce vertical mixing [Fischer et al, 1979;Imberger and Hamblin, 1982;Wüest et al, 2000]. In case of Rapel reservoir, the potential energy per unit of bed area of the water column between the elevation of the deepest thermistor (zt) and the free surface at the elevation H, was computed by solving the integral…”

Section: Field Measurements and Mixing Characterizationmentioning

confidence: 99%

Strong vertical mixing of deep water of a stratified reservoir during the Maule earthquake, central Chile (M_w 8.8)

Fuente

Meruane²,

Contreras³

et al. 2010

Geophysical Research Letters

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[1] Vertical profiles of water temperature in Rapel reservoir (central Chile, 34°2′ 23″ S, 71°35′ 23″ W, 110 m.a.s.l.), recorded the hydrodynamic response of the stratified water column of the reservoir produced by the 8.8 magnitude Maule earthquake (epicentre located in 36°15′36″S, 73°14′ 20″W), showing an intense vertical mixing of deep water. The vertical mixing was characterized by changes in the potential energy of the water column and the eddy diffusivity of the mixing, and these values were used to estimate the mixing efficiency of the event. It is hypothesized that the turbulent flow that mixed the water column was mainly induced by the oscillation of the bed, although surface gravitational waves could also have contributed to the vertical mixing. So far, this is the first time that the hydrodynamic response of a reservoir during a mega-earthquake is measured and described.

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Dynamics of Lakes, Reservoirs, and Cooling Ponds

Cited by 318 publications

References 66 publications

Down-slope cascading modulated by day/night variations of solar heating

Down-slope cascading modulated by day/night variations of solar heating

Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir

Strong vertical mixing of deep water of a stratified reservoir during the Maule earthquake, central Chile (M_w 8.8)

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Dynamics of Lakes, Reservoirs, and Cooling Ponds

Cited by 318 publications

References 66 publications

Down-slope cascading modulated by day/night variations of solar heating

Down-slope cascading modulated by day/night variations of solar heating

Diurnal buoyancy changes of Microcystis in an artificially mixed storage reservoir

Strong vertical mixing of deep water of a stratified reservoir during the Maule earthquake, central Chile (Mw 8.8)

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Strong vertical mixing of deep water of a stratified reservoir during the Maule earthquake, central Chile (M_w 8.8)