3D-modelling of the thermal circumstances of a lake under artificial aeration

Xiaoqing Tian, Huachen Pan, Riia Margit Petrina Köngäs, Jukka Antero Horppila

Tutkimustuotos: ArtikkelijulkaisuKatsausartikkeliTieteellinenvertaisarvioitu

Kuvaus

A 3D-model was developed to study the effects of hypolimnetic aeration on the temperature profile of a thermally stratified Lake Vesijärvi (southern Finland). Aeration was conducted by pumping epilimnetic water through the thermocline to the hypolimnion without breaking the thermal stratification. The model used time transient equation based on Navier–Stokes equation. The model was fitted to the vertical temperature distribution and environmental parameters (wind, air temperature, and solar radiation) before the onset of aeration, and the model was used to predict the vertical temperature distribution 3 and 15 days after the onset of aeration (1 August and 22 August). The difference between the modelled and observed temperature was on average 0.6 °C. The average percentage model error was 4.0% on 1 August and 3.7% on 22 August. In the epilimnion, model accuracy depended on the difference between the observed temperature and boundary conditions. In the hypolimnion, the model residual decreased with increasing depth. On 1 August, the model predicted a homogenous temperature profile in the hypolimnion, while the observed temperature decreased moderately from the thermocline to the bottom. This was because the effect of sediment was not included in the model. On 22 August, the modelled and observed temperatures near the bottom were identical demonstrating that the heat transfer by the aerator masked the effect of sediment and that exclusion of sediment heat from the model does not cause considerable error unless very short-term effects of aeration are studied. In all, the model successfully described the effects of the aerator on the lake’s temperature profile. The results confirmed the validity of the applied computational fluid dynamic in artificial aeration; based on the simulated results, the effect of aeration can be predicted.
Alkuperäiskielienglanti
LehtiApplied water science
Vuosikerta7
Numero8
Sivut4169-4176
DOI - pysyväislinkit
TilaJulkaistu - 2017
OKM-julkaisutyyppiA2 Katsausartikkeli tieteellisessä aikakauslehdessä

Tieteenalat

  • 1181 Ekologia, evoluutiobiologia

Lainaa tätä

Tian, Xiaoqing ; Pan, Huachen ; Köngäs, Riia Margit Petrina ; Horppila, Jukka Antero. / 3D-modelling of the thermal circumstances of a lake under artificial aeration. Julkaisussa: Applied water science . 2017 ; Vuosikerta 7, Nro 8. Sivut 4169-4176.
@article{24735d6fff434c05b7c85e23f4bd80dc,
title = "3D-modelling of the thermal circumstances of a lake under artificial aeration",
abstract = "A 3D-model was developed to study the effects of hypolimnetic aeration on the temperature profile of a thermally stratified Lake Vesij{\"a}rvi (southern Finland). Aeration was conducted by pumping epilimnetic water through the thermocline to the hypolimnion without breaking the thermal stratification. The model used time transient equation based on Navier–Stokes equation. The model was fitted to the vertical temperature distribution and environmental parameters (wind, air temperature, and solar radiation) before the onset of aeration, and the model was used to predict the vertical temperature distribution 3 and 15 days after the onset of aeration (1 August and 22 August). The difference between the modelled and observed temperature was on average 0.6 °C. The average percentage model error was 4.0{\%} on 1 August and 3.7{\%} on 22 August. In the epilimnion, model accuracy depended on the difference between the observed temperature and boundary conditions. In the hypolimnion, the model residual decreased with increasing depth. On 1 August, the model predicted a homogenous temperature profile in the hypolimnion, while the observed temperature decreased moderately from the thermocline to the bottom. This was because the effect of sediment was not included in the model. On 22 August, the modelled and observed temperatures near the bottom were identical demonstrating that the heat transfer by the aerator masked the effect of sediment and that exclusion of sediment heat from the model does not cause considerable error unless very short-term effects of aeration are studied. In all, the model successfully described the effects of the aerator on the lake’s temperature profile. The results confirmed the validity of the applied computational fluid dynamic in artificial aeration; based on the simulated results, the effect of aeration can be predicted.",
keywords = "1181 Ecology, evolutionary biology",
author = "Xiaoqing Tian and Huachen Pan and K{\"o}ng{\"a}s, {Riia Margit Petrina} and Horppila, {Jukka Antero}",
year = "2017",
doi = "10.1007/s13201-017-0577-6",
language = "English",
volume = "7",
pages = "4169--4176",
journal = "Applied water science",
issn = "2190-5487",
publisher = "Springer Heidelberg",
number = "8",

}

3D-modelling of the thermal circumstances of a lake under artificial aeration. / Tian, Xiaoqing; Pan, Huachen; Köngäs, Riia Margit Petrina; Horppila, Jukka Antero.

julkaisussa: Applied water science , Vuosikerta 7, Nro 8, 2017, s. 4169-4176.

Tutkimustuotos: ArtikkelijulkaisuKatsausartikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - 3D-modelling of the thermal circumstances of a lake under artificial aeration

AU - Tian, Xiaoqing

AU - Pan, Huachen

AU - Köngäs, Riia Margit Petrina

AU - Horppila, Jukka Antero

PY - 2017

Y1 - 2017

N2 - A 3D-model was developed to study the effects of hypolimnetic aeration on the temperature profile of a thermally stratified Lake Vesijärvi (southern Finland). Aeration was conducted by pumping epilimnetic water through the thermocline to the hypolimnion without breaking the thermal stratification. The model used time transient equation based on Navier–Stokes equation. The model was fitted to the vertical temperature distribution and environmental parameters (wind, air temperature, and solar radiation) before the onset of aeration, and the model was used to predict the vertical temperature distribution 3 and 15 days after the onset of aeration (1 August and 22 August). The difference between the modelled and observed temperature was on average 0.6 °C. The average percentage model error was 4.0% on 1 August and 3.7% on 22 August. In the epilimnion, model accuracy depended on the difference between the observed temperature and boundary conditions. In the hypolimnion, the model residual decreased with increasing depth. On 1 August, the model predicted a homogenous temperature profile in the hypolimnion, while the observed temperature decreased moderately from the thermocline to the bottom. This was because the effect of sediment was not included in the model. On 22 August, the modelled and observed temperatures near the bottom were identical demonstrating that the heat transfer by the aerator masked the effect of sediment and that exclusion of sediment heat from the model does not cause considerable error unless very short-term effects of aeration are studied. In all, the model successfully described the effects of the aerator on the lake’s temperature profile. The results confirmed the validity of the applied computational fluid dynamic in artificial aeration; based on the simulated results, the effect of aeration can be predicted.

AB - A 3D-model was developed to study the effects of hypolimnetic aeration on the temperature profile of a thermally stratified Lake Vesijärvi (southern Finland). Aeration was conducted by pumping epilimnetic water through the thermocline to the hypolimnion without breaking the thermal stratification. The model used time transient equation based on Navier–Stokes equation. The model was fitted to the vertical temperature distribution and environmental parameters (wind, air temperature, and solar radiation) before the onset of aeration, and the model was used to predict the vertical temperature distribution 3 and 15 days after the onset of aeration (1 August and 22 August). The difference between the modelled and observed temperature was on average 0.6 °C. The average percentage model error was 4.0% on 1 August and 3.7% on 22 August. In the epilimnion, model accuracy depended on the difference between the observed temperature and boundary conditions. In the hypolimnion, the model residual decreased with increasing depth. On 1 August, the model predicted a homogenous temperature profile in the hypolimnion, while the observed temperature decreased moderately from the thermocline to the bottom. This was because the effect of sediment was not included in the model. On 22 August, the modelled and observed temperatures near the bottom were identical demonstrating that the heat transfer by the aerator masked the effect of sediment and that exclusion of sediment heat from the model does not cause considerable error unless very short-term effects of aeration are studied. In all, the model successfully described the effects of the aerator on the lake’s temperature profile. The results confirmed the validity of the applied computational fluid dynamic in artificial aeration; based on the simulated results, the effect of aeration can be predicted.

KW - 1181 Ecology, evolutionary biology

U2 - 10.1007/s13201-017-0577-6

DO - 10.1007/s13201-017-0577-6

M3 - Review Article

VL - 7

SP - 4169

EP - 4176

JO - Applied water science

JF - Applied water science

SN - 2190-5487

IS - 8

ER -