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Harikumar, R.
- Wave Forecasting and Monitoring during very Severe Cyclone Phailin in the Bay of Bengal
Authors
1 Information Services and Ocean Sciences Group, ESSO-Indian National Centre for Ocean Information Services, 'Ocean Valley', Pragathi Nagar (BO), Nizampet (SO), Hyderabad 500 090, IN
2 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
3 Earth System Science Organization, New Delhi 110 003, IN
Source
Current Science, Vol 106, No 8 (2014), Pagination: 1121-1125Abstract
Wave fields, both measured and forecast during the very severe cyclone Phailin, are discussed in this communication. Waves having maximum height of 13.54 m were recorded at Gopalpur, the landfall point of the cyclone. The forecast and observed significant wave heights matched well at Gopalpur with correlation coefficient of 0.98, RMS e rror of 0.35 m and scatter index of 14%. Forecasts were also validated in the open ocean and found to be reliable (scatter index < 15%). The study also revealed the presence of Southern Ocean swells with a peak period of 20-22 sec hitting Gopalpur coast along with the cyclone-generated waves.Keywords
Buoys, Phailin, Tropical Cyclone, Swell, Wave Forecast.- Ground-Zero Met-Ocean Observations and Attenuation of Wind Energy during Cyclonic Storm Hudhud
Authors
1 ESSO-Indian National Centre for Ocean Information Services, Hyderabad 500 090, IN
2 Andhra University, Visakhapatnam 530 003, IN
3 Earth System Science Organisation, New Delhi 110 003, IN
Source
Current Science, Vol 110, No 12 (2016), Pagination: 2245-2252Abstract
Ocean-met observations from INCOIS real-time automatic weather station on-board a ship RV Kaustubh served as strong ground truth for satellite- and modelderived forecasts during the very severe cyclonic storm Hudhud, which made a landfall at Visakhapatnam, India. The ship recorded maximum wind speed of 204 km/h (with a minimum central pressure of 945 hPa), which is the highest (lowest) ever instrumentally recorded value at a location on the Indian coastline during any cyclone. Though the global model forecasts of wind fields have shown good agreement inland, they failed in representing the reality along the coasts. Variation in wind energy from ocean towards inland suggests that it is attenuated exponentially inland (the maximum wind power density had reduced by 93,406 W/m2 at Anakapalle (~25 km) compared to the ocean, and by 7022 W/m2 at Chintapalle (~100 km inland) compared to Anakapalle). The present study reinforces the significance of having realtime near-shore ocean-met observations, and their operational usage for evaluation (assimilation) of (into) ocean-met forecast models in realtime.Keywords
Automatic Weather Stations, Bias-Corrected Wind Forecasts, Forecast Models, Tropical Cyclones, Shipbased Observations, Wind Power Density.- Lyapunov-Based Impact Time Control Guidance Law against Maneuvering Target
Authors
1 Department of Electrical and Electronics Engineering, College of Engineering, Trivandrum, Kerala, IN
Source
Artificial Intelligent Systems and Machine Learning, Vol 8, No 8 (2016), Pagination: 286-290Abstract
Nonlinear guidance law that consider impact time constraints are proposed. An impact time control problem has been considered in the two-dimensional environment using Lyapunov stability theory, and the law was expressed in very simple forms to be implemented easily. Under the consideration of the nonlinear kinematics, it is shown that the missile states converge to the desired equilibrium point by the Lyapunov stability theory. The singularity issue of the proposed guidance law is also analyzed. Numerical simulations are performed to verify the performance of the proposed guidance laws. The proposed ITCG laws can be used for the salvo attack of multiple missiles to provide effective results.