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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

Temperature and wind velocity distribution on clear days and rainy days.
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Related In: Results  -  Collection


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fig13: Temperature and wind velocity distribution on clear days and rainy days.

Mentions: This temperature-reversal phenomenon is shown in Figure 13, which shows a graph of time averages during the measurement period. In the measured data, the temperature in lower areas was 2.0°C lower than in higher areas at night, but it was also 3.5°C higher in the daytime. Figure 13 shows 24 hours' worth of data measured at survey points on rainy days and the days prior to rainy days. In the daytime before rainy days, there was a clear temperature-reversal phenomenon in lower areas. The temperature was below zero in the dawns and evenings and above zero in the afternoons. However, during rainy days, all survey sites showed tiny temperature differences between the day and night of less than 1°C.


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

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

Temperature and wind velocity distribution on clear days and rainy days.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig13: Temperature and wind velocity distribution on clear days and rainy days.
Mentions: This temperature-reversal phenomenon is shown in Figure 13, which shows a graph of time averages during the measurement period. In the measured data, the temperature in lower areas was 2.0°C lower than in higher areas at night, but it was also 3.5°C higher in the daytime. Figure 13 shows 24 hours' worth of data measured at survey points on rainy days and the days prior to rainy days. In the daytime before rainy days, there was a clear temperature-reversal phenomenon in lower areas. The temperature was below zero in the dawns and evenings and above zero in the afternoons. However, during rainy days, all survey sites showed tiny temperature differences between the day and night of less than 1°C.

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