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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 velocity change according to wind angle change by measured points before and after construction of embankment.
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Related In: Results  -  Collection


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fig11: Wind velocity change according to wind angle change by measured points before and after construction of embankment.

Mentions: Five points between the two anemometers were selected as temperature measure points. The temperature change was recorded for 18 days, and the average temperature data measured every 5 minutes was automatically saved. The measurement range of the temperature sensor (HOBO Pro v2 Tem/RH Data Logger) was −40–70°C, and the measurement range of the wind velocity sensor was 0.5–50 m/s. Figure 11 compares the temperatures (average, maximum, and minimum) and wind velocities between the data recorded in the meteorological observatory and that measured in the field experiment during the 18-day experimental period. The weather station was 8.6 Km away from the field measurement location in straight-line distance, but their average temperatures were consistent. However, the number of days when a minimum temperature of below 0°C was observed was 9 days according to the meteorological observatory but 15 days in the field experiment, which means that the field-measured points had six more days that showed a minimum temperature of below 0°C. When the average temperature in the meteorological observatory was −4.1°C, it was −9.1°C at the field experiment site. For the average wind velocity distribution, a wind velocity of 1.1 m/s–2 m/s was shown for eight days in the field, while it was shown for only two days at the meteorological observatory. A wind velocity higher than 3 m/s was shown for three days in the field experiment and nine days at the meteorological observatory. The wind velocity was lower in the field-measured points than at the meteorological observatory. When comparing meteorological data between the meteorological observatory and the field experiment site during the experimental period (18 days), it was found that higher temperatures and lower wind velocities were observed more often at the field experiment site, although the highest recorded temperatures were almost identical. Figure 12 shows the average wind velocity and temperature at points (1.2 m and −11.5 m from the embankment) plotted against time. It was found that the temperature dropped below 0°C as the wind velocity rapidly decreased before 6 am and after 18 pm.


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

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

Wind velocity change according to wind angle change by measured points before and after construction of embankment.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig11: Wind velocity change according to wind angle change by measured points before and after construction of embankment.
Mentions: Five points between the two anemometers were selected as temperature measure points. The temperature change was recorded for 18 days, and the average temperature data measured every 5 minutes was automatically saved. The measurement range of the temperature sensor (HOBO Pro v2 Tem/RH Data Logger) was −40–70°C, and the measurement range of the wind velocity sensor was 0.5–50 m/s. Figure 11 compares the temperatures (average, maximum, and minimum) and wind velocities between the data recorded in the meteorological observatory and that measured in the field experiment during the 18-day experimental period. The weather station was 8.6 Km away from the field measurement location in straight-line distance, but their average temperatures were consistent. However, the number of days when a minimum temperature of below 0°C was observed was 9 days according to the meteorological observatory but 15 days in the field experiment, which means that the field-measured points had six more days that showed a minimum temperature of below 0°C. When the average temperature in the meteorological observatory was −4.1°C, it was −9.1°C at the field experiment site. For the average wind velocity distribution, a wind velocity of 1.1 m/s–2 m/s was shown for eight days in the field, while it was shown for only two days at the meteorological observatory. A wind velocity higher than 3 m/s was shown for three days in the field experiment and nine days at the meteorological observatory. The wind velocity was lower in the field-measured points than at the meteorological observatory. When comparing meteorological data between the meteorological observatory and the field experiment site during the experimental period (18 days), it was found that higher temperatures and lower wind velocities were observed more often at the field experiment site, although the highest recorded temperatures were almost identical. Figure 12 shows the average wind velocity and temperature at points (1.2 m and −11.5 m from the embankment) plotted against time. It was found that the temperature dropped below 0°C as the wind velocity rapidly decreased before 6 am and after 18 pm.

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