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Full-Text Articles in Physical Sciences and Mathematics
Unsteady Motions Of Separated Shear Layer In Wake Flow Due To Upstream Disturbance, Chin-Tsan Wang, Jun-Ji Miau, Cheng Kuang Shaw
Unsteady Motions Of Separated Shear Layer In Wake Flow Due To Upstream Disturbance, Chin-Tsan Wang, Jun-Ji Miau, Cheng Kuang Shaw
Journal of Marine Science and Technology
The phenomenon of physical wake flow is complex and remains relatively unknown, especially for the relationship between the span-wise motions of separated shear layers and low frequency variations embedded in the vortex shedding process of upstream disturbances. In this study experiments were executed by situating a mesh grid and controlling cylinder upstream. Results showed that the integral time scale of the span-wise motions for a separated shear layer was close to that of the low frequency variations for an upstream disturbance. This evidence supports the idea that span-wise motions of a separated shear layer and the low frequency variations should …
Aerosol Optical Depth Retrieval For Spot Hrv Images, Chien-Hui Liu, Gin-Rong Liu
Aerosol Optical Depth Retrieval For Spot Hrv Images, Chien-Hui Liu, Gin-Rong Liu
Journal of Marine Science and Technology
Atmospheric aerosol is an important factor of the Earth’s radiation budget. The aerosol optical depth (AOD) is also the key parameter in generating surface products from remotely sensed data. An image-based retrieval algorithm of aerosol characteristics and surface reflectance is used to retrieve the AOD from SPOT satellite images in this paper. The accuracy of retrieved AOD is assessed using sunphotometer measurements. SPOT satellite images in Jhongli , Taoyuan county are used to testify the algorithm. The results show that the rootmean-square error (RMSE) of the retrieved AOD at 0.55 µm is 0.10. Over the range of measured AOD 0.08~0.34, …
Analysis On Typhoon Longwang Intensity Changes Over The Ocean Via Satellite Data, Chung-Chih Liu, Tian-Yow Shyu, Chun-Chieh Chao, Yu-Feng Lin
Analysis On Typhoon Longwang Intensity Changes Over The Ocean Via Satellite Data, Chung-Chih Liu, Tian-Yow Shyu, Chun-Chieh Chao, Yu-Feng Lin
Journal of Marine Science and Technology
The changes in the typhoon intensity are a very important process. In this study, we used satellite data to analyze the cloud structure of Typhoon Longwang. Results show that the changes in the high level cirrus pattern seemed to have a connection to the typhoon intensity. During the time period from 0600UTC to 1200UTC 30 September 2005, the high level cirrus clouds of Typhoon Longwang radiated from the inner core region. The cloud area that Typhoon Longwang covered grew larger, and the pattern changed from a asymmetric to symmetric distribution during 0000UTC to 1200UTC 30 September 2005. The best track …