Estimation of the effective zone of sea/land breeze in a coastal area

Pokhrel, Rajib; Lee, Heekwan

doi:10.5094/apr.2011.013

Cited by 61 publications

(32 citation statements)

References 26 publications

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“…The location of the AWS is on land in the coastal region of Ratnagiri, whereas the values reported by Kumar et al (2006) are based on NCEP wind for an ocean location. Analysis shows that during the preand postmonsoon periods, wave height reaches a maximum value at around 15:00 UTC, similar to the observations of Pattiaratchi et al (1997) and Pokheral and Lee (2011) because of the sea breeze persisting over the coastal region of India and resulting wind sea. Minimum wave height is observed during the early hours of the day (03:00-06:00 UTC) due to the land breeze system.…”

Section: Sea Breeze and Land Breezesupporting

confidence: 79%

Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea

et al. 2013

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Abstract. Wave data collected off Ratnagiri, west coast of India, during 1 May 2010 to 30 April 2012 are used in this study. Seasonal and annual variations in wave data controlled by the local wind system such as sea breeze and land breeze, and remote wind generated long period waves are also studied. The role of sea breeze on the sea state during pre-and postmonsoon seasons is studied and it is found that the maximum wave height is observed at 15:00 UTC during the premonsoon season, with an estimated difference in time lag of 1-2 h in maximum wave height between premonsoon and postmonsoon seasons. Observed waves are classified in to (i) short waves (T p < 8 s), (ii) intermediate waves (8 < T p < 13 s), and (iii) long waves (T p > 13 s) based on peak period (T p ) and the percentages of occurrence of each category are estimated. Long period waves are observed mainly during the pre-and the postmonsoon seasons. During the southwest monsoon period, the waves with period > 13 s are a minimum. An event during 2011 is identified as swells propagated from the Southern Ocean with an estimated travelling time of 5-6 days. The swells reaching the Arabian Sea from the south Indian Ocean and Southern Ocean, due to storms during the pre-and postmonsoon periods, modify the near surface winds due to higher phase wave celerity than the wind speed. Estimation of inverse wave age using large-scale winds such as NCEP (National Centers for Environmental Prediction) reflects the presence of cyclonic activity during pre-and postmonsoon seasons but not the effect of the local sea breeze/land breeze wind system.

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Section: Sea Breeze and Land Breezesupporting

confidence: 79%

Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea

et al. 2013

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“…Airflow in the coastal area transports and disperses the pollutants generated from the sources in the coastal area. The boundary of air pollution transportation is confined by the horizontal and the vertical boundary layer of airflow in the coastal area (Pokhrel and Lee, 2011). Therefore, the airflow/air dispersion modeling was carried out to estimate the air dispersion mechanism in the study area.…”

Section: Resultsmentioning

confidence: 99%

“…1(b). The modeling period was selected for typical summer period; late July (Julian day 198-204) when the maximum number of S/L breeze days were observed (Jeong et al, 2008;Pokhrel and Lee, 2011). The potential temperature (298 K), reference pressure (1004 mb) and inversion height (1000 m) were set based on references (Annual Climatological Report, 2007;Lee and Lee, 2004).…”

Section: Modeling Conditionsmentioning

confidence: 99%

“…The best example of mesoscale air circulation in coastal area is Sea/Land (S/L) breeze, which is highly significant to transport the air pollution from source to the receptor (Kim and William, 2007;Karim et al, 2007;Fan et al, 2008;Jung et al, 2009;Pokhrel and Lee, 2011). Due to its diurnal variation characteristics, it transports the air pollution from the sea to land, and vice-versa in the coastal area.…”

Section: Introductionmentioning

confidence: 95%

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Estimation of air pollution from the OGVs and its dispersion in a coastal area

Pokhrel

Lee

2015

Ocean Engineering

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“…Northeast monsoon is the most important effects of Aeolian dust in Taiwan. Besides, due to the strong sea breezes during the daytime (Pokhrel and Lee, 2011) in winter, the wind speed of monsoon is faster than in summer.…”

Section: Study Zone and Weathermentioning

confidence: 99%

The Horizontal and Vertical Characteristics of Aeolian Dust from Riverbed

Syu

Cheng

Kao

et al. 2016

Aerosol Air Qual. Res.

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Arid riverbed is an important source of Aeolian dust to influence the atmosphere of nearby village or downtown. In general, Aeolian dust pertains to wind activity in the study of geology, environment and meteorology on particle suspension. This field study set the horizontal/vertical sampling system up in order to investigate the Aeolian dust dimensional distribution properties from the riverbed of the Jhuoshuei River. In addition, the study utilized the unmanned aerial vehicle (UAV) imagery to discriminate the covering condition of riverbed. The results revealed that the percentage of riverbed covering conditions, including bare zone, wetlands, green covering and water covering was about 50.1, 15.7, 16.8 and 17.4%, respectively, on January 5 th , 2011. Two Aeolian dust cases from riverbed were measured on November 26 th , 2010 and January 15 th , 2011. First sampling case was under slower wind speed, and the total particulate matter (PM) concentration in vertical sampling was almost decreased with increasing sampling height, however, the phenomena of second case (faster wind speed) was just on the contrary. Besides, Aeolian dust was distributed in a bimodal or a multimodal curve, and the main peak size was above 10 µm. Mode size of suspension particle diameter was increased as the wind speed increased (14.8 µm/ first case; 21.3 µm/ second case). The total mass concentration ratio of south site to source site (one meter height) was about 1:9 in first case and about 1:3 in second case. Comparing with those two cases, the faster the wind is, the shorter the surface roughness height is (3.08 mm/ first case; 1.07 mm/ second case). Besides, as the wind speed increasing, the friction velocity was also increased (0.33 m s -1 / first case; 0.68 m s -1 / second case). Consequently, this study clued the spatial variability of river dust events, which can further aid the site investigating, forecasting and preventing of dust influences.

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Estimation of the effective zone of sea/land breeze in a coastal area

Cited by 61 publications

References 26 publications

Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea

Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea

Estimation of air pollution from the OGVs and its dispersion in a coastal area

The Horizontal and Vertical Characteristics of Aeolian Dust from Riverbed

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