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Use of surface currents measured by HF radar in planning coastal discharges
Institution:1. Institute of Strength Physics and Materials Science SB RAS, 2/1 Akademichesky av., Tomsk 634055, Russia;2. JSC “A.A. Bochvar High-Technology Research Institute of Inorganic Materials”, 5 Rogov st., Moscow 123060, Russia;1. Marine Chemical Research Institute, State Key Laboratory of Marine Coatings, Qingdao 266071, China;2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Abstract:Surface currents measured by HF Radar (OSCR) are analysed to determine near-shore circulation in connection with planning optimum locations for sewage discharges. Dual radar units, each measuring a radial velocity component, were deployed at a total of five sites for three separate periods each of one week's duration (one site being common to two deployments). Observed data from 20 radial ‘bins’ each 1.2 km long were obtained for six beams each 6° wide at all five sites. These data were analysed separately to determine 1. the tidal constituents, 2. the wind driven component and 3. the steady residual component. In deriving the wind-driven response a relationship
></figure> was assumed where R(t) is the non-tidal velocity, W<sub>E</sub> and W<sub>N</sub> east and west components of wind speed, Δt a time lag and α and β empirical coefficients determined by least squares fitting techniques. At positions where beams from any two sites crossed, their separate current components were combined, producing the following spatial distributions of surface current vectors: 1. tidal ellipses, 2. separate responses to unit wind forcing from a. west and b. south and 3. steady residual drifts. The validity of these current distributions is examined by 1. comparison with other observational data, 2. by consideration of their self coherence and 3. in terms of simple theory.</td>
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