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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

Distribution of wind velocities by measurement site according to wind angle changes in area to right of embankment.
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Related In: Results  -  Collection


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fig5: Distribution of wind velocities by measurement site according to wind angle changes in area to right of embankment.

Mentions: Figure 4 shows the outline of the wind velocity measurements by reference wind velocity and measurement site. Figure 5 shows the distribution of wind velocities by measurement site according to wind angle changes in the area to the right of the embankment. Wind velocity changes by measurement site were found to vary compared to the reference wind velocities according to wind angle changes. However, the wind velocity of the southeastern position as the valley wind on the land was at most 60% smaller than the wind velocities measured from other wind directions. After the construction of the embankment road, large declines in wind velocity were shown compared to the reference wind velocities in all measured wind directions except some northern directions. The wind directions (N and NNW) with small wind velocity changes before and after the construction of the embankment were found in the sites with lower embankment heights than the other sites. This study examined wind velocity changes according to increases in the reference wind velocities before and after the construction of the embankment. The wind angles from some northern directions (N, NNW, and NW) before and after the construction of the embankment showed that the rates of decline of wind velocities after construction were small at less than 20% regardless of the measurement location or wind velocity. A smaller distance between the measurement site and the embankment and an increase in the reference wind velocity resulted in a corresponding larger degree of wind velocity decline. This study examined wind velocity changes compared to the reference wind velocities according to the level difference between the embankment's height and the measurement site. In the case of Measurement Site 3, it was −13.6 m under the embankment road. After its construction, wind velocity changes were 1 or below in all wind velocities. It was confirmed that the rate of decline of wind velocities was being influenced by the level difference from the embankment.


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

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

Distribution of wind velocities by measurement site according to wind angle changes in area to right of embankment.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig5: Distribution of wind velocities by measurement site according to wind angle changes in area to right of embankment.
Mentions: Figure 4 shows the outline of the wind velocity measurements by reference wind velocity and measurement site. Figure 5 shows the distribution of wind velocities by measurement site according to wind angle changes in the area to the right of the embankment. Wind velocity changes by measurement site were found to vary compared to the reference wind velocities according to wind angle changes. However, the wind velocity of the southeastern position as the valley wind on the land was at most 60% smaller than the wind velocities measured from other wind directions. After the construction of the embankment road, large declines in wind velocity were shown compared to the reference wind velocities in all measured wind directions except some northern directions. The wind directions (N and NNW) with small wind velocity changes before and after the construction of the embankment were found in the sites with lower embankment heights than the other sites. This study examined wind velocity changes according to increases in the reference wind velocities before and after the construction of the embankment. The wind angles from some northern directions (N, NNW, and NW) before and after the construction of the embankment showed that the rates of decline of wind velocities after construction were small at less than 20% regardless of the measurement location or wind velocity. A smaller distance between the measurement site and the embankment and an increase in the reference wind velocity resulted in a corresponding larger degree of wind velocity decline. This study examined wind velocity changes compared to the reference wind velocities according to the level difference between the embankment's height and the measurement site. In the case of Measurement Site 3, it was −13.6 m under the embankment road. After its construction, wind velocity changes were 1 or below in all wind velocities. It was confirmed that the rate of decline of wind velocities was being influenced by the level difference from the embankment.

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