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Characteristics of wind velocity and temperature change near an escarpment-shaped road embankment.

Kim YM, You KP, You JY - ScientificWorldJournal (2014)

Bottom Line: Artificial structures such as embankments built during the construction of highways influence the surrounding airflow.The construction of the embankment influenced surrounding temperatures.The degree of temperature change was large in locations with large level differences from the embankment at daybreak and during evening hours when wind velocity changes were small.

View Article: PubMed Central - PubMed

Affiliation: The Department of Architectural Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea.

ABSTRACT
Artificial structures such as embankments built during the construction of highways influence the surrounding airflow. Various types of damage can occur due to changes in the wind velocity and temperature around highway embankments. However, no study has accurately measured micrometeorological changes (wind velocity and temperature) due to embankments. This study conducted a wind tunnel test and field measurement to identify changes in wind velocity and temperature before and after the construction of embankments around roads. Changes in wind velocity around an embankment after its construction were found to be influenced by the surrounding wind velocity, wind angle, and the level difference and distance from the embankment. When the level difference from the embankment was large and the distance was up to 3H, the degree of wind velocity declines was found to be large. In changes in reference wind velocities around the embankment, wind velocity increases were not proportional to the rate at which wind velocities declined. The construction of the embankment influenced surrounding temperatures. The degree of temperature change was large in locations with large level differences from the embankment at daybreak and during evening hours when wind velocity changes were small.

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Related in: MedlinePlus

Wind angles and measurement points.
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fig3: Wind angles and measurement points.

Mentions: To identify the flow of air near the highway embankments, a wind velocity test was performed upon a 1/150 scaled land model. The land model for the wind tunnel was made of Styrofoam, and an aluminum bar was installed so that anemometers could be installed to measure wind velocity. The turbulent boundary layer wind tunnel device was a vertical circulation closed-circuit type, and the sectional size of the tunnel was 12 m in width, 2.5 m in height, and 40 m in length. Figure 2 shows the experimental land model installed inside the wind tunnel. To identify wind velocity changes in highway embankments, multichannel anemometers (System 6242 Model 1560) were used. The experiment was performed to identify changes in wind velocity according to the level difference in the surrounding topography before and after the construction of highway embankments with a certain initial wind velocity. To identify changes in wind velocity below the embankment, a total of 19 points were selected, as there was a difference in the levels from the southern side and northern side of the embankment. The anemometer was installed only in the southern direction. As the southern area was larger than the northern area, it was used as an orchard. Wind velocity tests were conducted in five sites just below the embankment and in 14 sites at random distances from the embankment. The tested wind angles were limited to those of the winds blown from the northern and southern directions of the embankment. The wind velocity tests were performed on 10 wind angles including each set of four wind angles with a 22.5° gap between the NW-NE wind angle and the SW-SE wind angle. Figure 3 presents the wind angles in the wind tunnel test. The anemometer that measured reference wind velocities was installed above the road with the embankment. The heights of 19 measurement sites and the reference anemometer were fixed at 10 mm (full-scale height was 1.5 m).


Characteristics of wind velocity and temperature change near an escarpment-shaped road embankment.

Kim YM, You KP, You JY - ScientificWorldJournal (2014)

Wind angles and measurement points.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4127258&req=5

fig3: Wind angles and measurement points.
Mentions: To identify the flow of air near the highway embankments, a wind velocity test was performed upon a 1/150 scaled land model. The land model for the wind tunnel was made of Styrofoam, and an aluminum bar was installed so that anemometers could be installed to measure wind velocity. The turbulent boundary layer wind tunnel device was a vertical circulation closed-circuit type, and the sectional size of the tunnel was 12 m in width, 2.5 m in height, and 40 m in length. Figure 2 shows the experimental land model installed inside the wind tunnel. To identify wind velocity changes in highway embankments, multichannel anemometers (System 6242 Model 1560) were used. The experiment was performed to identify changes in wind velocity according to the level difference in the surrounding topography before and after the construction of highway embankments with a certain initial wind velocity. To identify changes in wind velocity below the embankment, a total of 19 points were selected, as there was a difference in the levels from the southern side and northern side of the embankment. The anemometer was installed only in the southern direction. As the southern area was larger than the northern area, it was used as an orchard. Wind velocity tests were conducted in five sites just below the embankment and in 14 sites at random distances from the embankment. The tested wind angles were limited to those of the winds blown from the northern and southern directions of the embankment. The wind velocity tests were performed on 10 wind angles including each set of four wind angles with a 22.5° gap between the NW-NE wind angle and the SW-SE wind angle. Figure 3 presents the wind angles in the wind tunnel test. The anemometer that measured reference wind velocities was installed above the road with the embankment. The heights of 19 measurement sites and the reference anemometer were fixed at 10 mm (full-scale height was 1.5 m).

Bottom Line: Artificial structures such as embankments built during the construction of highways influence the surrounding airflow.The construction of the embankment influenced surrounding temperatures.The degree of temperature change was large in locations with large level differences from the embankment at daybreak and during evening hours when wind velocity changes were small.

View Article: PubMed Central - PubMed

Affiliation: The Department of Architectural Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea.

ABSTRACT
Artificial structures such as embankments built during the construction of highways influence the surrounding airflow. Various types of damage can occur due to changes in the wind velocity and temperature around highway embankments. However, no study has accurately measured micrometeorological changes (wind velocity and temperature) due to embankments. This study conducted a wind tunnel test and field measurement to identify changes in wind velocity and temperature before and after the construction of embankments around roads. Changes in wind velocity around an embankment after its construction were found to be influenced by the surrounding wind velocity, wind angle, and the level difference and distance from the embankment. When the level difference from the embankment was large and the distance was up to 3H, the degree of wind velocity declines was found to be large. In changes in reference wind velocities around the embankment, wind velocity increases were not proportional to the rate at which wind velocities declined. The construction of the embankment influenced surrounding temperatures. The degree of temperature change was large in locations with large level differences from the embankment at daybreak and during evening hours when wind velocity changes were small.

Show MeSH
Related in: MedlinePlus