DOI QR코드

DOI QR Code

Settling Characteristics of Saemankeum fine-Cohesiv Sediments : Effects of Physico-Chemical Properties

새만금 미세점착성 퇴적물의 침강특성 : 퇴적물의 물리.화학적 특성의 영향

  • 황규남 (전북대학교 토목환경공학부, 공학연구원 공업기술연구센터) ;
  • 조용식 (한양대학교 공과대학 토몽공학과)
  • Published : 2002.10.01

Abstract

A series of settling tests and physico-chemical property tests on Saemankeum fine-cohesive sediments has been conducted in order to investigate the correlation between settling properties and their physico-chemical properties which are represented as grain size distribution, mineralogical composition, and percentage of organic contents. Experimental results of physico-chemical property tests show that Saemankeum sediments are relatively large in average grain size(52${\mu}{\textrm}{m}$), and contain very small organic materials(2%), and are dominantly composed of Quarts in mineralogical aspect which has relatively low cohesion. Thus, Saemankeum sediments might be specified as the sediments whose settling properties are more influenced by the gravity than the cohesion. This characteristics of Saemankeum sediments are found to lead to relatively small settling velocity in flocculated settling region in which increasing cohesion results in increasing settling velocity, while relatively large settling velocity in hindered settling region in which settling velocity decreases with increasing cohesion.

새만금 미세점착성 퇴적물의 침강특성을 퇴적물 자체의 물리ㆍ화학적 기본특성과 연계 해석하기 위하여, 퇴적물의 입경분포, 광물질 구성 및 유기물 함량 조사로 구성되는 새만금 퇴적물에 대한 물리ㆍ화학적 특성 조사가 수행되었다. 새만금 퇴적물의 물리ㆍ화학적 특성에 대한 분석 결과, 새만금 퇴적물은 평균입경(52$\mu\textrm{m}$)이 비교적 크고 유기물 함량(2%)이 매우 작으며, 점착력이 비교적 자은 석영이 주된 광물질 구성성분으로 점착력에 의한 침강효과 보다는 중력에 의한 침강효과가 더 큰 퇴적물인 것으로 밝혀졌다. 따라서 이러한 효과로 인하여, 새만금 퇴적물은 응집효과가 침강속도를 증가시키는 응집침강 영역에서 비교적 작은 침강속도를 가지며, 응집효과가 침강속도를 감소시키는 간섭침강 영역에서는 비교적 큰 침강속도를 갖는 것으로 나타났다.

Keywords

References

  1. 박용철 (1997). 해양환경공정시험방법. 한국해양학회, 국립수산진흥원
  2. 나영 (2000). 새만금 갯벌 내의 중금속 흡착특성에 관한 연구. 석사학위논문, 전북대학교
  3. 이재연 (2001). 새만금 해역 갯벌 퇴적물의 침강특성에 관한 연구. 석사학위논문, 전북대학교
  4. 황규남 (2000). '새만금 갯벌퇴적물의 침강속도 산정을 위한 실험적 연구.' 대한토목학회 논문집, 대한토목학회, 제20권, 2-B호, pp. 277-286
  5. ASTM (1987). Annual Book of A.S.T.M. Standards, 04.08, American Society for Testing and Materials, Philadelphia, USA
  6. Burt, T.N. (1986). 'Field settling velocities of estuary muds.' Estuarine Cohesive Sediment Dynamics, Edited by Mehta, A.J., Springer-Verlag, Berlin. pp. 126-150
  7. Choi, J.H. (1981). Recent clay minerals in the Kunsan Estuary and the adjacent continental shelf. Master's thesis, Dept. of Oceanography, Seoul National Univ.
  8. Hwang, K.-N. (1989). Erodibility of fine sediment in wave-dominated environments. Master's thesis, Univ, of Florida, Gainesville, Florida
  9. Krone, R.B. (1962). Flume studies of the transport of sediment in estuarial shoaling process. Final Report, Hydraulic Engineering Laboratory and Sanitary Engineering Research Laboratory, University of California, Berkeley, California
  10. Kynch, G.J. (1952). 'A theory of sedimentation.' Transactions of the Faraday Society, Vol. 48, pp. 166-176 https://doi.org/10.1039/tf9524800166
  11. van Leussen, W. (1988). 'Aggregation of particles, settling velocity of mud flocs-a review.' Physical Processes in Estuaries, Edited by Dronkers J. and van Leussen, W., Springer-Verlag, Berlin, pp. 347-403
  12. Mehta, A.J. (1986). 'Characterization of cohesive sediment properties and transport processes in estuaries.' Estuarine Cohesive Sediment Dynamics, Edited by Mehta, A.J., Springer-Verlag, Berlin, pp. 290-325
  13. Mehta, A.J. (1988). 'Laboratory studies on cohesive sediment deposition and erosion.' Physical Processes in Estuaries, Edited by Dronkers J. and van Leussen, W., Springer-Verlag, Berlin, pp. 427-445
  14. Ross, M.A. (1988). Cohesive sediments in estuarine environment. Ph.D. dissertation, Univ. of Florida, Gainesville, FL

Cited by

  1. An Experimental Study on Depositional Properties of Cohesive Sediments in Masan Port vol.27, pp.6, 2015, https://doi.org/10.9765/KSCOE.2015.27.6.434