동해 울산 연안해역 SSDP-105 심부코어 지점의 지음향 모델 = Geoacoustic Model at the SSDP-105 Long-core Site of the Ulsan Coastal Area, the East Sea

다국어 초록 (Multilingual Abstract)

Geoacoustic model comprises physical and acoustic properties of submarine bottom layers influencing sound transmission through sea water and underwater. This study suggested for the first time that we made a geoacoustic model of long-coring bottom layers at the SSDP-105 drilling site of the Ulsan coastal area, which is located in the southwestern inner shelf of the East Sea. The geoacoustic model of 52 m depth below seafloor with three-layer geoacoustic units was reconstructed in the coastal sedimentary strata at 79 m in water depth. The geoacoustic model was based on the data of a deep-drilled sediment core of SSDP-105 and sparker seismic profiles in the study area. For actual modeling, the geoacoustic property values of the models were compensated to in situ depth values below the sea floor using the Hamilton modeling method. We suggest that the geoacoustic model be used for geoacoustic and underwater acoustic experiments of mid- and low-frequency reflecting on the deep bottom layers in the Ulsan coastal area of the East Sea.

국문 초록 (Abstract)

지음향 모델은 수중과 해저 음파의 전파에 영향을 미치는 해저 지층의 물성과 음향 특성을 포함한다. 이 연구는 동해 남서부 내대륙붕에 위치한 울산 해역의 SSDP-105 시추 지점에서 심부 지층의 지음향 모델을 처음으로 제시하였 다. 수심 79 m의 연안 퇴적 지층에서 52 m 심도의 3개 지음향 모델을 구성하였다. 지음향 모델은 연구 해역의 SSDP- 105 심부시추 코어 자료와 스파커 탄성파 단면 자료에 근거한다. 실제 모델링을 위해, 모델의 지음향 특성값은 Hamilton 모델링 방법을 이용하여 해저면 하부 현장 심도의 특성값으로 보정하였다. 이 지음향 모델은 동해 울산 연안 해역에서 심부 지층의 지음향 특성을 반영하는 중·저주파수 지음향/수중음향 실험을 위해 활용될 것이다.

참고문헌 (Reference)

1 양우헌, "동해 한국대륙주변부 정동진 연안 지층의 지음향 모델" 한국지구과학회 37 (37): 200-210, 2016

2 양우헌, "동해 옥계, 북평 연안 기반암의 지음향 속도와 제3기 퇴적층" 한국지구과학회 28 (28): 367-373, 2007

3 Korea Institute of Geoscience and Mining Resources, "Study on Quaternary stratigraphy and environmental changes in Korean seas (Analyses of SSDP-101, SSDP-102, SSDP-103, SSDP-104, SSDP-105 cores), KR-00(B)-02" 678-, 2000

4 Hamilton, E.L., "Sound velocity gradients in marine sediments" 65 : 909-922, 1979

5 Carey, W.M., "Shallow-water sound transmission measurements on the New Jersey continental shelf" 20 : 321-336, 1995

6 Kwon, Y.K., "Seismic stratigraphy of the western South Korea Plateau, East Sea: implications for tectonic history and sequence development during back-arc evolution" 29 : 181-189, 2009

7 Agency for Defense Development (ADD), "Seismic stratigraphy and deep coring in the major harbors, NSDC-408-040241" 76-, 2004

8 Ainslie, M.A., "Principles of sonar performance modeling" Springer 707-, 2010

9 Hamilton, E.L., "Predictions of in-situ acoustics and elastic properties of marine sediments" 36 : 266-284, 1971

10 Kim, G.Y., "Physical and geotechnical properties of drill core sediments in the Heuksan Mud Belt off SW Korea" 468 : 33-48, 2018

11 Folk, R.L., "Petrology of sedimentary rocks" Hemphill's 170-, 1968

12 Mackenzie, K.V., "Nine-term equation for sound speed in the oceans" 70 : 807-812, 1981

13 Chough, S.K., "Marine geology of Korean seas" Elsevier 313-, 2000

14 Korea Institute of Geoscience and Mining Resources, "Marine geological and geophysical mapping of the Korean seas, GP2010-013-2012(3)" 344-, 2012

15 Jackson, D.R., "High-frequency seafloor acoustics" Springer 616-, 2007

16 Zhou, J-X., "Geoacoustic parameters in a stratified sea bottom from shallow-water acoustic propagation" 82 : 2068-2074, 1987

17 Hamilton, E.L., "Geoacoustic modeling of the sea floor" 68 : 1313-1339, 1980

18 양우현, "Geoacoustic model at the DH-1 long-core site in the Korean continental margin of the East Sea" 한국지질과학협의회 18 (18): 269-279, 2014

19 Katsnelson, B., "Fundamentals of shallow water acoustics" Springer 540-, 2012

20 Hamilton, E.L., "Acoustics and Ocean Bottom" Cosejo Superior de Investigaciones Cientificas 3-58, 1987

21 Folk, R.L., "A study in the significance of grain-size parameters" 27 : 3-27, 1957