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פותח על ידי קלירמאש פתרונות בע"מ -
From atmospheric winds to fracture ventilation: Cause and effect
Year:
2012
Authors :
נחשון, אורי
;
.
Volume :
117
Co-Authors:
Nachshon, U., Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
Dragila, M., Faculty of Soil Science, School of Integrated Plant, Soil and Insect Sciences, Oregon State University, Corvallis, OR, United States
Weisbrod, N., Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
Facilitators :
From page:
To page:
(
Total pages:
1
)
Abstract:
Vadose zone fractures and soil cracks exposed to the atmosphere have an impact on gas exchange processes at the Earth-atmosphere interface. In this study we explored and quantified the role of ground-surface winds on fracture ventilation. While the governing physical mechanisms that cause ventilation are relatively well understood, this is the first work to quantify these processes in natural fractures and to determine the net effect on gas exchange. In this study field measurements pointed to a correlation between surface wind velocity and the ventilate rate of surface-exposed fractures. To better explore and quantify this phenomenon, laboratory experiments were carried out using a Hele-Shaw chamber to simulate a natural fracture and the ventilation of smoke, used as a gas tracer, was explored as a function of controlled surface-wind and fracture aperture. It was found that ventilation depth is linearly correlated to wind velocity and nonlinearly with fracture aperture. Results were used to formulate an empirical model for Earth-atmosphere air exchange. This model can be used to estimate by how much the presence of fractures enhances that exchange under windy conditions. Incorporating this venting process into Earth-atmosphere gas exchange simulations is another step toward improving our ability to better predict and quantify soil aeration, soil temperature variation, water vapor loss and processes related to climate change, such as the fate and transport of greenhouse gases. Copyright 2012 by the American Geophysical Union.
Note:
Related Files :
climate change
Fracture
soil temperature
Tracer
vadose zone
Ventilation
wind velocity
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2011JG001898
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26513
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:23
Scientific Publication
From atmospheric winds to fracture ventilation: Cause and effect
117
Nachshon, U., Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
Dragila, M., Faculty of Soil Science, School of Integrated Plant, Soil and Insect Sciences, Oregon State University, Corvallis, OR, United States
Weisbrod, N., Department of Environmental Hydrology and Microbiology, Ben-Gurion University of the Negev, Sede Boker Campus, Midreshet Ben-Gurion, 84990, Israel
From atmospheric winds to fracture ventilation: Cause and effect
Vadose zone fractures and soil cracks exposed to the atmosphere have an impact on gas exchange processes at the Earth-atmosphere interface. In this study we explored and quantified the role of ground-surface winds on fracture ventilation. While the governing physical mechanisms that cause ventilation are relatively well understood, this is the first work to quantify these processes in natural fractures and to determine the net effect on gas exchange. In this study field measurements pointed to a correlation between surface wind velocity and the ventilate rate of surface-exposed fractures. To better explore and quantify this phenomenon, laboratory experiments were carried out using a Hele-Shaw chamber to simulate a natural fracture and the ventilation of smoke, used as a gas tracer, was explored as a function of controlled surface-wind and fracture aperture. It was found that ventilation depth is linearly correlated to wind velocity and nonlinearly with fracture aperture. Results were used to formulate an empirical model for Earth-atmosphere air exchange. This model can be used to estimate by how much the presence of fractures enhances that exchange under windy conditions. Incorporating this venting process into Earth-atmosphere gas exchange simulations is another step toward improving our ability to better predict and quantify soil aeration, soil temperature variation, water vapor loss and processes related to climate change, such as the fate and transport of greenhouse gases. Copyright 2012 by the American Geophysical Union.
Scientific Publication
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