Analysis of Atmospheric Stability for the Prevention of Coastal Disasters and the Development of Efficient Coastal Renewable Energy

Kim, Hyun-Su; Moon, Chae-Joo; Kim, Young-Gon; Chon, Kyung-Hee; Joo, Joon Young; Ryu, Geon Hwa

doi:10.2112/jcr-si114-049.1

Cited by 1 publication

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“…Atmospheric stability is an important factor used to define atmospheric turbulence or to describe the magnitude of atmospheric diffusion [13]. It refers to the degree to which the atmosphere in a state of mechanical equilibrium is slightly disturbed to return to its original state or the state of the atmosphere is likely to change significantly.…”

Section: Atmospheric Stability Indexmentioning

confidence: 99%

“…It is an index of atmospheric stability indicating the degree of dominance of buoyancy over the shear effect. The MO similarity theory is basically organized under five hypotheses [13,43]:…”

Section: Monin-obukhov Lengthmentioning

confidence: 99%

“…In general, it is difficult to accurately calculate wind resources because the wind in the lower part of the atmospheric boundary layer is generated by the simultaneous action of mechanical forcing due to surface friction and thermal forcing involving the heat balance due to surface heating [11,12]. In particular, in the case of coastal areas, a large amount of water vapor is distributed in the atmosphere and the change in atmospheric stability is relatively larger than that of land due to the difference in heat balance between the ocean and inland [13]. In addition, South Korea has a lot of mountainous terrain and a complex coastline, but not a lot of flat lands compared to its total area.…”

Section: Introductionmentioning

confidence: 99%

“…Atmospheric conditions include turbulence intensity, wind shear, and heat flux, all of which depend largely on atmospheric stability. Therefore, analysis of atmospheric stability is essential [13]. According to a previous study, thermal forcing based on humidity and temperature should be considered before predicting offshore and coastal vertical shear because winds at each vertical layer analyzed from the meteorological observation tower located on the offshore show rapid changes according to atmospheric stability [20].…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric Stability Effects on Offshore and Coastal Wind Resource Characteristics in South Korea for Developing Offshore Wind Farms

Ryu

Kim²,

Kwak

et al. 2022

Energies

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South Korea is surrounded by the sea on three sides. The characteristics of offshore wind resources vary from region to region due to the influence of the distribution of the coastline and differences in roughness length and atmospheric stability between the coast and the sea. In particular, turbulent gusts and low-level wind shear occurring near the hub height of the wind turbine within the atmospheric boundary layer have a significant effect on the load of wind turbines. These severe weather phenomena are closely related to atmospheric stability. Therefore, the objective of this study is to determine differences in wind resource characteristics in the South Korean offshore and coast in relation to variations in atmospheric stability using observation data from the HeMOSU-1 meteorological tower in the West Sea and the Boseong meteorological observation tower on the southern coast. On the southern coast, changes in sea and land breezes are observed throughout diurnal and nocturnal periods, with an atmospheric stability distribution similar to that of land, which is unstable during the day and becomes more stable at night. On the other hand, the stable ratio continues to dominate in the west offshore. In the case of coastal areas, low-level wind shear occasionally occurs near the general wind turbine hub height approximately over 100 m due to the influence of winds from the sea. This study shows that when constructing an offshore wind farm, it is necessary to first analyze the characteristics of local coastal and offshore wind resources for more efficient and safe wind farm construction and operation.

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Section: Atmospheric Stability Indexmentioning

confidence: 99%

Section: Monin-obukhov Lengthmentioning

confidence: 99%