Author: W. Z. Sadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Book Description
The velocity and longitudinal turbulence intensity distributions inside and above a forest canopy along its center line were investigated. For this purpose a model forest canopy was used in a meteorological wind tunnel. The results indicate that the flow may be divided into an entrance and fully developed region followed by a short adjustment distance close to canopy end. The entrance region has a decisive effect on the flow characteristics through the canopy. The velocity and turbulence inside the canopy are strongly affected by its structure. A similar qualitative variation for both velocity and turbulence was found in and above the canopy. Its influence stretches over more than 4 roughness heights above it. Generally, the results are in relatively reasonable agreement with field measurements. Investigation of the modified logarithmic law for describing the velocity profile above the canopy revealed that both flow parameters, i.e., friction velocity and roughness length, are not local constants. On the contrary, they vary drastically with height. It is suspected that this is due to the fact the assumption of constant shear stress throughout the boundary layer or significant portions of it is not satisfied. (Author).
Flow Field Within and Above a Forest Canopy: Task I: Study of Airflow in Simulated Temperate and Tropical Forest Canopies
Author: W. Z. Sadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Book Description
The velocity and longitudinal turbulence intensity distributions inside and above a forest canopy along its center line were investigated. For this purpose a model forest canopy was used in a meteorological wind tunnel. The results indicate that the flow may be divided into an entrance and fully developed region followed by a short adjustment distance close to canopy end. The entrance region has a decisive effect on the flow characteristics through the canopy. The velocity and turbulence inside the canopy are strongly affected by its structure. A similar qualitative variation for both velocity and turbulence was found in and above the canopy. Its influence stretches over more than 4 roughness heights above it. Generally, the results are in relatively reasonable agreement with field measurements. Investigation of the modified logarithmic law for describing the velocity profile above the canopy revealed that both flow parameters, i.e., friction velocity and roughness length, are not local constants. On the contrary, they vary drastically with height. It is suspected that this is due to the fact the assumption of constant shear stress throughout the boundary layer or significant portions of it is not satisfied. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 71
Book Description
The velocity and longitudinal turbulence intensity distributions inside and above a forest canopy along its center line were investigated. For this purpose a model forest canopy was used in a meteorological wind tunnel. The results indicate that the flow may be divided into an entrance and fully developed region followed by a short adjustment distance close to canopy end. The entrance region has a decisive effect on the flow characteristics through the canopy. The velocity and turbulence inside the canopy are strongly affected by its structure. A similar qualitative variation for both velocity and turbulence was found in and above the canopy. Its influence stretches over more than 4 roughness heights above it. Generally, the results are in relatively reasonable agreement with field measurements. Investigation of the modified logarithmic law for describing the velocity profile above the canopy revealed that both flow parameters, i.e., friction velocity and roughness length, are not local constants. On the contrary, they vary drastically with height. It is suspected that this is due to the fact the assumption of constant shear stress throughout the boundary layer or significant portions of it is not satisfied. (Author).
Flow Field Within and Above a Forest Canopy
Author: Willy Z. Sadeh
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 62
Book Description
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 62
Book Description
Wind Tunnel Studies and Simulations of Turbulent Shear Flows Related to Atmospheric Science and Associated Technologies
Author: W.Z. Sadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 946
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 946
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
An Investigation of Flow Over High Roughness. Task I: Study of Airflow in Simulated Temperature and Tropical Forest Canopies, Fort Huachuca
Author: T. Kawatani
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
Book Description
An experimental investigation of the atmospheric boundary-layer flow on high roughness was conducted by simulating the flow over a forest canopy in a meteorological wind tunnel. The model forest canopy used consisted of plastic simulated-evergreen trees. The measurements were carried out at constant free-stream velocity and under thermally neutral conditions. Two canopy densities were tested to explore the effects of the roughness density on the flow. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 175
Book Description
An experimental investigation of the atmospheric boundary-layer flow on high roughness was conducted by simulating the flow over a forest canopy in a meteorological wind tunnel. The model forest canopy used consisted of plastic simulated-evergreen trees. The measurements were carried out at constant free-stream velocity and under thermally neutral conditions. Two canopy densities were tested to explore the effects of the roughness density on the flow. (Author).
Wastewater Aerosols and Disease
Author: H. Pahren
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 388
Book Description
Publisher:
ISBN:
Category : Aerosols
Languages : en
Pages : 388
Book Description
U.S. Government Research & Development Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 212
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 212
Book Description
Meteorological and Geoastrophysical Abstracts
Author:
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 900
Book Description
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 900
Book Description
Numerical Simulation of Canopy Flows
Author: Günter Groß
Publisher: Springer Science & Business Media
ISBN: 364275676X
Category : Science
Languages : en
Pages : 243
Book Description
Starting with the description of meteorological variables in forest canopies and its parameter variations, a numerical three-dimentional model is developed. Its applicability is demonstrated, first, by wind sheltering effects of hedges and, second, by the effects of deforestation on local climate in complex terrain. Scientists in ecology, agricultural botany and meteorology, but also urban and regional lanners will profit from this study finding the most effective solution for their specific problems.
Publisher: Springer Science & Business Media
ISBN: 364275676X
Category : Science
Languages : en
Pages : 243
Book Description
Starting with the description of meteorological variables in forest canopies and its parameter variations, a numerical three-dimentional model is developed. Its applicability is demonstrated, first, by wind sheltering effects of hedges and, second, by the effects of deforestation on local climate in complex terrain. Scientists in ecology, agricultural botany and meteorology, but also urban and regional lanners will profit from this study finding the most effective solution for their specific problems.
U.S. Government Research & Development Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1298
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1298
Book Description