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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 left of embankment.
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Related In: Results  -  Collection


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fig6: Distribution of wind velocities by measurement site according to wind angle changes in area to left of embankment.

Mentions: Figure 6 shows wind velocity changes by measurement site according to wind angle changes in the area to the left of the embankment. The left area contained many areas that were over 50% higher in terms of the average level difference. The left area was also being influenced by the measurement sites and wind angles in the degree of wind velocity changes compared to the reference wind velocities before and after the construction of the embankment. Measurement Site 5 located just below the embankment had a level difference of −11.5 m from the embankment road and showed a large degree of wind velocity decline with over 70% after the construction of the embankment at a reference wind velocity of 3 m/s. However, Measurement Sites 9, 14, and 15 exhibited little wind velocity changes compared to the reference wind velocities regarding the wind angles of the southern direction before and after the construction of the embankment. This is probably because these sites had larger level differences than the equivalent right sites. It was confirmed that the wind velocity changes around the embankment were largely influenced by the distance and 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 left of embankment.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig6: Distribution of wind velocities by measurement site according to wind angle changes in area to left of embankment.
Mentions: Figure 6 shows wind velocity changes by measurement site according to wind angle changes in the area to the left of the embankment. The left area contained many areas that were over 50% higher in terms of the average level difference. The left area was also being influenced by the measurement sites and wind angles in the degree of wind velocity changes compared to the reference wind velocities before and after the construction of the embankment. Measurement Site 5 located just below the embankment had a level difference of −11.5 m from the embankment road and showed a large degree of wind velocity decline with over 70% after the construction of the embankment at a reference wind velocity of 3 m/s. However, Measurement Sites 9, 14, and 15 exhibited little wind velocity changes compared to the reference wind velocities regarding the wind angles of the southern direction before and after the construction of the embankment. This is probably because these sites had larger level differences than the equivalent right sites. It was confirmed that the wind velocity changes around the embankment were largely influenced by the distance and 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