Ship-Wake 이론을 이용한 잠수함 항적탐색 가능성 = The Detectability of Submarine's Turbulent Wake on the sea surface using Ship-Wake Theory

국문 초록 (Abstract)

자유전단류(Shear free flow) 가정을 이용한 수상함 항적모델을 잠수함에 적용 결과 잠수함 난류항적 지름은 $x^n,\;({\frac{1}{5}}{\leq}n\;<{\frac{1}{2}})$ 에 비례하였으며, 난류항적의 최소 확산을 가정할 때(${\sigma}=50.25$, 즉 ${\infty}\;x^{1/5}$인 경우), 길이65m, 폭 6.5m 속력 6kts 인 잠수함의 난류항적 반지름은 잠수함 함미로부터 1.2Km 후방에서 약 20m, 10Km 후방에서는 약 30m에 달하였고, 해수면에서 관측 가능한 잠수함 난류항적은 잔잔한 해상상태에서 잠수함 후방 약 15Km에 이르는 것으로 나타났으나 쇄파가 발생하는 악천후에서는 해수면에서 난류항적을 관측하기는 매우 제한되었다. 이는 적어도 서해와 같이 얕은 잠수함 작전환경에서는 잠수함 난류항적이 해수면에서 나타나는 것을 의미하며 SAR와 같은 탐지체계를 이용 시 탐색 가능함을 의미한다.

다국어 초록 (Multilingual Abstract)

The width of a submarine's turbulent wake, using Shear-free and Ship wake theory, is proportional to $x^n,\;({\frac{1}{5}}{\leq}n<{\frac{1}{2}})$ If we assume submarine's length, width, velocity are 65m, 6.5m, 6kts respectively, and the minimum diffusion of turbulent wake ; ${\infty}\;x^{1/5}$, the width of wake behind the submarine is about 20m at 1.2km, 30m at 15km when there is no breaking waves on the sea surface. However, in the case of breaking waves, it is very limited to identify submarine's wake on the sea surface because wind generated turbulent wake has higher turbulent kinetic energy than that of submarine's wake. As a result, there is a high possibility to detect submarine's wake on the sea surface in the shallow water such as the Yellow-Sea using a proper detection method such as SAR. This means that in anti-submarine operations, non-acoustic sea surface serveillance applied turbulent wake will be very effective way to detect a submarine in near future. To do this we have to develop exact theory of submarine's turbulent wake above all.

참고문헌 (Reference)

1 지윤희, "항적 산란신호의 모델링과 실험적 검증" 한국음향학회 28 (28): 10-18, 2009

2 E.Naudascher, "low in the Wake of Self Propelled Bodies and related source of Turbulence" 22 (22): 1965

3 Minnett, "The Regional Optimization of Infrared Measurement of Sea Surface Temperature from Space" 95 (95): 13497-13510, 1990

4 Dickey T.D, "Ten Emergence of Concurrent High Resolution Physical and Bio-Optical Measurement" 29 (29): 383-413, 1991

5 Lyden, Hammond, "Synthetic Aperture Radar imaging of surface ship wakes" 93 (93): 12293-12303, 1988

6 Milgram, "Suppression of Short Sea waves in Ship Wake Measurements and Observations" 98 (98): 7103-7114, 1993

7 Monin, Yaglom, "Statistical Fluid Mechanics : Mechanics of Turbulence, Vol 1" 383-, 1979

8 A. Y. Benilov, "Ship-Wake Turbulence" 10 : 253-264, 1997

9 M. Reed, "Ship Wakes and Their Radar Images" 34 : 469-502, 2002

10 G. Zilman, "SAR Imaging of Ship Wakes and Inverse Ship Wake Problem" 2004

11 Milgram, Skop, "Modeling Short Wave Energy Distributions in the Far Wakes of Ships" 98 (98): 7115-7124, 1993

12 Stewart, "Methods of Satellite Oceano-graphy" Univ. of California Press 1985

13 이귀주, "Kelvin Ship Wake Modification due to Wind Waves" 한국해양공학회 22 (22): 1-6, 2008

14 Hasselmann, "Gurndleichungen der seegangs voraussage" 7 : 191-195, 1960

15 Shemer, "Estimates of Currents in the Nearshore Ocean Region using interferometric Synthetic Aperture Radar" 98 (98): 7001-7010, 1993

16 K. A. Hoffman, "Computational Fluid Dynamics for Engineers" A Publication of Engineering Education System 1989

17 R.L.Synider, "Array measurements of atmospheric pressure fluctuations above surface gravity waves" 102 : 1-59, 1981

18 Kelly, Caruso, "A Modified Objective Mapping Technique for Scatterometer Wind Data" 95 (95): 13483-13496, 1990

19 H. Tennekes, "A First course in Turbulence" MIT Press 1990