Browse > Article

Accuracy of HF radar-derived surface current data in the coastal waters off the Keum River estuary  

Lee, S.H. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Moon, H.B. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Baek, H.Y. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Kim, C.S. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Son, Y.T. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Kwon, H.K. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Choi, B.J. (Department of Oceanography, BK21 Saemangeum Environmental Research Team, Kunsan National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.13, no.1, 2008 , pp. 42-55 More about this Journal
Abstract
To evaluate the accuracy of currents measured by HF radar in the coastal sea off Keum River estuary, we compared the facing radial vectors of two HF radars, and HF radar-derived currents with in-situ measurement currents. Principal component analysis was used to extract regression line and RMS deviation in the comparison. When two facing radar's radial vectors at the mid-point of baseline are compared, RMS deviation is 4.4 cm/s in winter and 5.4 cm/s in summer. When GDOP(Geometric Dilution of Precision) effect is corrected from the RMS deviations that is analyzed from the comparison between HF radar-derived and current-metermeasured currents, the error of velocity combined by HF radar-derived current is less than 5.1 cm/s in the stations having moderate GDOP values. These two results obtained from different method suggest that the lower limit of HF radar-derived current's accuracy is 5.4 cm/s in our study area. As mentioned in previous researches, RMS deviations become large in the stations located near the islands and increase as a function of mean distance from the radar site due to decrease of signal-to-noise level and the intersect angle of radial vectors. We found that an uncertain error bound of HF radar-derived current can be produced from the separation process of RMS deviations using GDOP value if GDOP value for each component is very close and RMS deviations obtained from current component comparison are also close. When the current measured in the stations having moderate GDOP values is separated into tidal and subtidal current, characteristics of tidal current ellipses analyzed from HF radar-derived current show a good agreement with those from current-meter-measured current, and time variation of subtidal current showed a response reflecting physical process driven by wind and density field.
Keywords
HF Radar; PCA; RMS-Deviation; GDOP; Accuracy Evaluation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 국립해양조사원, 2005. 조석표(한국연안)
2 신은주, 이상호, 최현용, 2002. 금강풀룸의 구조와 분포에 대한 수치모델 연구. 한국해양학회지(바다), 7(3): 157-170
3 Bowden, K.F., 1983. Physical Oceanography of Coastal Waters, Ellis Horwood Limited, 302 pp.
4 Emery, W.J. and R.E. Thomson, 1997. Data analysis methods in physical oceanography, Elsevier, 638 pp
5 Graber, H.C., B.K. Haus, R.D. Chapman, and L.K. Shay, 1997. HF radar comparisons with moored estimates of current speed and direction: Expected differences and implications, J. Geophys. Res., 102(C08): 18,749-18,766
6 Hisaki, Y., T. Tokeshi, W. Fujiie, K. Sato, and S. Fujii, 2001. Surface current variability east of Okinawa Island obtained from remotely sensed and in situ observational data. J. Geophys. Res. 106(12): 31057-31073   DOI
7 Lee, S.H. and R.C. Beardsley, 1999. Influence of stratification on residual tidal currents in the Yellow Sea. J. Geophys. Res. 104(C7): 15679-15701   DOI
8 Lee, S.H., 2003. Variability of currents observed in Saemangeum coastal region. In: Choi, B.H., Kioka, W. (Eds.), Hydro-environmental impacts of large coastal developments, ACECC-TCI Workshop Proceeding by KSCOE and CECJSCE, pp. 73-89
9 Prandle, D. 1987. The fine structure of near shore tidal and residual circulations reveled by H.F. radar surface current measurements. J. Physical Oceanography 17: 231-245   DOI
10 Choi, B.H., 1980. A tidal model of the Yellow Sea and the Eastern China Sea. Korea Ocean Research and Development Institute (KORDI) Report 80-02, pp72
11 Easton, A.K., 1977. Selected programs for tidal analysis and prediction. Computing Report. The Flinders Institute for Atmospheric and Marine Sciences, pp79
12 김창수, 이상호, 손영태, 권효근, 이광희, 김영배, 정우진, 2006. 새만금 4호 방조제 완성 전후 HF 레이다로 관측된 표층 $M_2$ 조류의 변화. 한국해양학회지(바다), 11(2): 37-48   과학기술학회마을
13 Choi, B.H., 2001. Effect of Saemangeum tidal barriers on the Yellow Sea tidal regime. In: Proceedings Of The First Asian And Pacific Coastal Engineering Conference, PAPCE2001, Dalian, China, no. 1, pp. 25-36
14 Son, Y.T., S.H. Lee, C.S. Kim, J.C. Lee and G.H. Lee, 2007. Surface current variability in the Keum River Estuary (South Korea) during summer 2002 as observed by high-frequency radar and coastal monitoring buoy. Continental Shelf Research. 27: 43-63   DOI   ScienceOn
15 Kang, S.K., 2002. Study on tidal change prediction due to the large scale of coastal reclamation (TIDPRE, II), KORDI report BSPM 191-00-1560-2, 426 pp
16 Barrick, D.E., M.W. Evans, and B.L. Weber, 1977. Ocean surface currents mapped by radar, Science, 198: 138-144   DOI   ScienceOn
17 Kovacevic, V., M. Gacic, I.M. Mosquera, A. Mazzoldi, A. Mazzoldi and S. Marinetti, 2004. HF radar observations in the northern Adriatic: surface current field in front of the Venetian Lagoon. J. Marine Systems 51: 95-122   DOI   ScienceOn
18 최현용, 이상호, 유광우, 1999. 금강하구언 대량방류시 관측된 황해중동부 연안역의 염분분포. 한국해양학회지(바다), 4(1): 1-9
19 농어촌진흥공사, 1990-1998. 새만금지구 간척종합개발사업 사후환경영향 조사보고서
20 Haus, B.K., J.D. Wang, J. Martinez-Pedraja, and N. Smith, 2000. Remote radar measurement of shelf currents off Key Largo, Florida, USA. Estuarine, Coastal and Shelf Sciences 51: 553-569   DOI   ScienceOn
21 Paduan, J.D. and Graber, H.C., 1997. Introduction to HF radar, reality and myth. Oceanography 10: 36-39   DOI   ScienceOn
22 Yoshikawa, Y., T. Matsuno, K. Marubayashi, and K. Fukudome 2007. A surface velocity spiral observed with ADCP and HF radar in the Tsushima Strait, J. Geophys. Res., 112, C06022, doi: 10.1029/2006JC00362   DOI   ScienceOn
23 이상호, 최현용, 오임상, 1995. 하계금강 Plume의 구조와 변동. 한국해양학회지(바다), 30: 125-137
24 이상호, 최현용, 손영태, 권효근, 김영곤, 양재삼, 정해진, 김종구, 2003. 하계 서해안 새만금 연안역 주변 저염수와 순환. 한국해양학회지(바다), 8(2): 138-150
25 Choi, B.H. and Lee, H.S., 2003. Preoperational simulation of dyke closure for Saemangeum tidal barriers. In: Choi, B.H., Kioka, W. (Eds.), Hydro-environmental impacts of large coastal developments, ACECC-TC1 Workshop Proceeding by KSCOE and CECJSCE, pp. 91-118
26 고재원, 정신택, 김 철, 조흥연, 2001. 지리정보체계를 이용한 만경강동진강의 유역정보 및 오염 부하량 분석. 한국해안해양공학회지, 13(3): 237-244
27 Chapman, R.D., L.K. Shay, H.C. Graber, J.B. Edson, A. Karachintsev, C.L. Trump, and D.B. Ross, 1997. On the accuracy of HF radar surface current measurements: inter-comparisons with shipbased sensors, J. Geophys. Res., 102(C8): 18, 737-18, 748
28 Knight, P.J., Howarth, M.J., 1999. The flow through the northern channel of the Irish Sea. Continental Shelf Research 19: 693- 713   DOI   ScienceOn
29 Yoshikawa, Y., A. Masuda, K. Marubayashi, M. Ishibashi, and A. Okuno 2006. On the accuracy of HF radar measurement in the Tsushima Strait, J. Geophys. Res., 111, C04009, doi: 10.1029/2005JC003232