Repair wind field in oil contaminated areas with SAR images -- Journal of Oceanology and Limnology,2015,33(2):525-533

	Cite this paper:
	GUO Jie, HE Yijun, LONG Xiao, HOU Chawei, LIU Xin, MENG Junmin. Repair wind field in oil contaminated areas with SAR images[J]. Journal of Oceanology and Limnology, 2015, 33(2): 525-533

Repair wind field in oil contaminated areas with SAR images

GUO Jie¹, HE Yijun^2,3, LONG Xiao⁴, HOU Chawei⁵, LIU Xin¹, MENG Junmin⁶

1 Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences; Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, CAS, Yantai 264003, China;
2 School of Marine Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3 Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China;
4 Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
5 Yantai Marine Environmental Monitoring Central Station, State Oceanic Administration (SOA), Yantai 264006, China;
6 First Institute of Oceanography, State Oceanic Administration (SOA), Qingdao 266061, China

Abstract:

In this paper, we compared the normalized radar cross section in the cases of oil spill, biogenic slicks, and clean sea areas with image samples made from 11-pixel NRCS average, and determined their thresholds of the NRCS of the synthetic aperture radar. The results show that the thresholds of oil and biogenic slicks exhibit good consistency with the corresponding synthetic aperture radar images. In addition, we used the normalized radar cross section of clean water from adjacent patches of oil or biogenic slicks areas to replace that of oil or biogenic slicks areas, and retrieve wind field by CMOD5.n and compare wind velocity mending of oil and biogenic slicks areas with Weather Research and Forecasting modeled data, from which the root mean squares of wind speed (wind direction) inversion are 0.89 m/s (20.26°) and 0.88 m/s (7.07°), respectively. Therefore, after the occurrence of oil spill or biogenic slicks, the real wind field could be repaired using the method we introduced in this paper. We believe that this method could improve the accuracy in assessment of a real wind field on medium and small scales at sea, and enhance effectively the monitoring works on similar oil or biogenic slicks incidents at sea surface.

Key words: wind speed|oil spill|biogenic slicks|normalized radar cross section

Received: 2014-04-04 Revised: 2014-05-12

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