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Determining the safe route of the vessel based on the atmospheric condition by using the automatic meteorological system
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Ali Mohammadi    , Mehriar Ali Mohammadi , Ahmad Zadaghabadi , Hamid Momeni |
| Imam Khomeini University of Marine Sciences , mhyar_alimohammadi@yahoo.com |
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Abstract: (62 Views) |
Background and Objectives: Atmospheric condition is one of the most important natural hazards for floating units. One of the shortcomings related to the weather situation is the lack of attention of the watch officers to the correct collection of weather data through the devices in the command bridge. For example, air pressure is read without instrument and altitude corrections and is never compared to a long-term average. Therefore, the aim of this research is to build a system on floating units that can automatically measure the atmospheric parameters and by calculating the required parameters from the measured parameters and comparing with the long-term average data, it can identify the atmospheric anomaly and as a result, make the right decisions regarding the appropriate maneuvers.
Methods: In this research, using existing sensors, a meteorological device has been built that can collect atmospheric data from the environment and store it in the computer, and by using a computer program, it can compare the measured data with the long-term average and detect atmospheric and oceanic anomalies. to identify By identifying the atmospheric anomaly, the phenomenon related to this anomaly is also identified, and the guard officer can have an appropriate maneuver related to the identified phenomenon. Finally, in this research, the way the device works has been evaluated using numerical tests. In this numerical experiment, a floating unit moves from the origin of Bandar Abbas in such a way that it collides with cyclone Gonu along the way and the measured pressure is compared with the average pressure of 40 years.
Findings: The first point along the track to experience a pressure drop of 3 hPa compared to the 40-year average is at approximately 135° ˚ and 120 miles from the storm's center. In fact, the distance of 120 miles from the center of the storm is a close distance, and in this case, the pressure has decreased by only 3 hectopascals compared to the 40-year average. The first point where the pressure has reached 5 hPa below the 40-year average is when the center of the storm is southeast and about 50 miles from the center of the storm. Therefore, it can be seen that the floating unit is very close to the storm and in this case it experienced only 5 hectopascal pressure drop.
Conclusion: The results show that a pressure drop of 5 millibars is a suitable criterion to definitively prove that the floating unit is in a tropical storm, and of course, due to the extreme proximity of the floating unit to the center of the storm in this case, a pressure drop of 1 hectopascal is suggested as a warning. |
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| Keywords: Safe way, tropical storm, air pressure, Average 40 years old |
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Type of Study: Research/ Original/ Regular Article |
Subject:
Marine Warning & Hazards
Received: 2023/11/26 | Revised: 2024/07/21 | Accepted: 2024/07/21
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