Evaporation reduction from farm dams using air-bubble plume destratification

Fernanda Helfer, Hong Zhang, Charles Lemckert

Research output: Contribution to conference (non-published works)Paper

Abstract

Abstract: The objective of this paper is to assess the effectiveness of destratification by air- bubble plumes in reducing evaporation from shallow and deep dams in Australia, based on modelling. DYRESM was applied to model the thermodynamics and evaporation from a farm dam in Queensland under different destratification conditions and two different depths: 6.5 and 13.5 metres. The results showed that destratification can reduce surface temperature and evaporation from both shallow and deep waters, but higher effectiveness is expected in deep lakes. This occurs because the bottom water of a deep lake is colder than the surface water during almost the entire year, which is a condition necessary for reducing the surface water temperature and, consequently evaporation rates, under destratification conditions. However, the reduction in surface water temperature and evaporation will not be significant during hot weather periods (that is, when the difference between the surface water temperature and the air temperature is high). Under this condition, the cooled surface water will be rapidly heated and the destratification system will only contribute to further increasing the heat stored in the water.
Original languageEnglish
Pages13-18
Number of pages6
Publication statusPublished - 2012
Externally publishedYes
EventIWA World Congress on Water, Climate and Energy - Dublin, Ireland
Duration: 13 May 201218 May 2012
http://iwa-wcedublin.org/

Conference

ConferenceIWA World Congress on Water, Climate and Energy
CountryIreland
CityDublin
Period13/05/1218/05/12
Internet address

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air bubble
plume
evaporation
dam
farm
surface water
surface temperature
water temperature
lake
bottom water
shallow water
deep water
air temperature
thermodynamics
weather
modeling
water

Cite this

Helfer, F., Zhang, H., & Lemckert, C. (2012). Evaporation reduction from farm dams using air-bubble plume destratification. 13-18. Paper presented at IWA World Congress on Water, Climate and Energy , Dublin, Ireland.
Helfer, Fernanda ; Zhang, Hong ; Lemckert, Charles. / Evaporation reduction from farm dams using air-bubble plume destratification. Paper presented at IWA World Congress on Water, Climate and Energy , Dublin, Ireland.6 p.
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title = "Evaporation reduction from farm dams using air-bubble plume destratification",
abstract = "Abstract: The objective of this paper is to assess the effectiveness of destratification by air- bubble plumes in reducing evaporation from shallow and deep dams in Australia, based on modelling. DYRESM was applied to model the thermodynamics and evaporation from a farm dam in Queensland under different destratification conditions and two different depths: 6.5 and 13.5 metres. The results showed that destratification can reduce surface temperature and evaporation from both shallow and deep waters, but higher effectiveness is expected in deep lakes. This occurs because the bottom water of a deep lake is colder than the surface water during almost the entire year, which is a condition necessary for reducing the surface water temperature and, consequently evaporation rates, under destratification conditions. However, the reduction in surface water temperature and evaporation will not be significant during hot weather periods (that is, when the difference between the surface water temperature and the air temperature is high). Under this condition, the cooled surface water will be rapidly heated and the destratification system will only contribute to further increasing the heat stored in the water.",
keywords = "Water management, Bubble plumes, Water quality",
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year = "2012",
language = "English",
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Helfer, F, Zhang, H & Lemckert, C 2012, 'Evaporation reduction from farm dams using air-bubble plume destratification' Paper presented at IWA World Congress on Water, Climate and Energy , Dublin, Ireland, 13/05/12 - 18/05/12, pp. 13-18.

Evaporation reduction from farm dams using air-bubble plume destratification. / Helfer, Fernanda; Zhang, Hong; Lemckert, Charles.

2012. 13-18 Paper presented at IWA World Congress on Water, Climate and Energy , Dublin, Ireland.

Research output: Contribution to conference (non-published works)Paper

TY - CONF

T1 - Evaporation reduction from farm dams using air-bubble plume destratification

AU - Helfer, Fernanda

AU - Zhang, Hong

AU - Lemckert, Charles

PY - 2012

Y1 - 2012

N2 - Abstract: The objective of this paper is to assess the effectiveness of destratification by air- bubble plumes in reducing evaporation from shallow and deep dams in Australia, based on modelling. DYRESM was applied to model the thermodynamics and evaporation from a farm dam in Queensland under different destratification conditions and two different depths: 6.5 and 13.5 metres. The results showed that destratification can reduce surface temperature and evaporation from both shallow and deep waters, but higher effectiveness is expected in deep lakes. This occurs because the bottom water of a deep lake is colder than the surface water during almost the entire year, which is a condition necessary for reducing the surface water temperature and, consequently evaporation rates, under destratification conditions. However, the reduction in surface water temperature and evaporation will not be significant during hot weather periods (that is, when the difference between the surface water temperature and the air temperature is high). Under this condition, the cooled surface water will be rapidly heated and the destratification system will only contribute to further increasing the heat stored in the water.

AB - Abstract: The objective of this paper is to assess the effectiveness of destratification by air- bubble plumes in reducing evaporation from shallow and deep dams in Australia, based on modelling. DYRESM was applied to model the thermodynamics and evaporation from a farm dam in Queensland under different destratification conditions and two different depths: 6.5 and 13.5 metres. The results showed that destratification can reduce surface temperature and evaporation from both shallow and deep waters, but higher effectiveness is expected in deep lakes. This occurs because the bottom water of a deep lake is colder than the surface water during almost the entire year, which is a condition necessary for reducing the surface water temperature and, consequently evaporation rates, under destratification conditions. However, the reduction in surface water temperature and evaporation will not be significant during hot weather periods (that is, when the difference between the surface water temperature and the air temperature is high). Under this condition, the cooled surface water will be rapidly heated and the destratification system will only contribute to further increasing the heat stored in the water.

KW - Water management

KW - Bubble plumes

KW - Water quality

M3 - Paper

SP - 13

EP - 18

ER -

Helfer F, Zhang H, Lemckert C. Evaporation reduction from farm dams using air-bubble plume destratification. 2012. Paper presented at IWA World Congress on Water, Climate and Energy , Dublin, Ireland.