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Suseentharan, V.
- Indian Coastal Ocean Radar Network
Abstract Views :269 |
PDF Views:77
Authors
Affiliations
1 Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Chennai - 600 100, IN
1 Coastal and Environmental Engineering Division, National Institute of Ocean Technology, Chennai - 600 100, IN
Source
Current Science, Vol 116, No 3 (2019), Pagination: 372-378Abstract
As a part of the Indian Ocean Observation Network, National Institute of Ocean Technology operates and maintains a network of high frequency radar (HFR) systems along the Indian coast, known as Indian coastal ocean radar network (ICORN). It is a land-based remote sensing system capable of measuring surface currents as far as 200 km from the coast and waves, and wind direction nearly 100 km offshore. The HFR systems utilize electromagnetic waves in the 3-45 MHz frequency band and use Bragg scattering principle to deduce the oceanographic parameters. ICORN currently operates and maintains five pairs (10 sites) of long-range systems (∼5 MHz) which covers four states and Andaman and Nicobar Islands. These systems operate at a spatial resolution of 6 km and temporal resolution of one hour. Indian National Centre for Ocean Information Services at Hyderabad disseminates this data for scientific and maritime operations. The potential of HFR systems is enormous and can be employed in various facets of operational oceanography and applied research.Keywords
HF Radar, EICC, ICORN, Surface Currents, Waves.Full Text
References
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- Surface Circulation off the Andaman Islands from HF Radar Observations
Abstract Views :245 |
PDF Views:84
Authors
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai 600 100, IN
Source
Current Science, Vol 118, No 11 (2020), Pagination: 1739-1745Abstract
Surface circulations off the Andaman Islands are least studied, much of the fundamental understanding of the circulations are from model studies. A pair of High-Frequency Radar (HFR) systems, as a part of the Indian Coastal Ocean Radar Network operated by the National Institute of Ocean Technology, MoES measures surface currents as far as 200 km from the coast since 2010. The present study focuses on the coastal circulation and its variability along the east coast of the Andaman Islands. The general circulation pattern in this region shows a poleward flow during December and January with November and February as transition months, and in the remaining months the flow is more or less equatorward. The current present in the HFR coverage is strongly influenced by the tides. Semidiurnal tidal constituents dominate surface current with a maximum variability of 24%. The amplitude of M2 component varied between ∼5 and 10.5 cm s–1. The major tidal constituents matched well with tide gauge measurements in the study region. These findings point towards the strong influence of remote forcing on the currents along the east coast of the Andaman Islands.Keywords
HF Radar, Surface Currents, Tidal Ellipse, Waves.Full Text
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