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낙동강하구 사주지형의 시공간적 변화와 SS거동과의 상관성
이인철(I.C. LEE),이병호(B.H. Yi),윤한삼(H.S. Yoon) 한국해양환경·에너지학회 2006 한국해양환경공학회 학술대회논문집 Vol.2006 No.-
In this study, as a basic study for prediction of topographical change in Nakdong River Estuary, monitoring of topographical changes at a sand bar around Jinudo which located in western of Nakdong River Estuary were carried out. From the results of the monitoring of topographical change, all parts except northern part of Jinudo have active topographical changes and have a tendency to deposit annually. From the results of correlation analysis between the seasonal changes of erosion/deposition rate around Jinudo and SS concentration, southern part of the Jinudo has a positive correlation. It was considered that SS worked as important factor in topographical change of southern part of Jinudo.
고차고해상도 수치기법을 이용한 초음속 제트 screech tone의 axisymmetric mode 해석
이인철(I.C. Lee),이덕주(D.J. Lee) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
The screech tone of an underexpanded jet is numerically calculated without any specific modeling for the screech tone itself. A fourth-order optimized compact scheme and fourth-order Runge-Kutta method are used to solve the 2D axisymmetric Euler equation. The Fourier transform of pressure signal at upstream shows the directivity pattern of the screech tone very clearly. Pressure signal is shown to observe the generation of the screech tone. Most importantly, we can simulate the axisymmetric mode change of the screech tone very precisely with the proposed method. It can be concluded that the basic phenomenon of the screech tone including its frequency can be calculated and its mode change can be simulated with inviscid Euler equations.
이인철(I.C. LEE),김경희(K.H. KIM),류청로(C.R. RYU),김윤태(Y.T. KIM) 한국해양환경·에너지학회 2004 한국해양환경·에너지학회 학술대회논문집 Vol.2004 No.-
This study investigated about inflow behavior & quantitative rating of sediments to make a management plan in Nakdong river Estuary using in-situ collector experiment of suspended particle matter and resuspended bed load, grain size analysis and tidal current observation. The grain-size analysis of surface sediments using Unified Solid Classification System (USCS) shows that SC is distributed mainly in the north of the sand bar and SP in the south. In terms of spatial distribution, the sedimentation rate has a large value in St.1 and St.4 and bed flux has maximum value in St.4 and minimum value in St.3. The range of the sedimentation rate and bed load flux is 0.0004~0.427 g/㎠/day and 0.085~1.7579 g/㎠/day, respectively.
이인철(I.C. LEE),공화훈(H.H. KONG),옥곤(K. OK) 한국해양환경·에너지학회 2006 한국해양환경공학회 학술대회논문집 Vol.2006 No.-
In this paper, in order to setup the management system of water quality environment in Jinhae Bay. inflowing pollutant loads were estimated. Inflowing pollutant loads of COD, SS, TN, TP, DIN and DIP in Jinhae Bay were estimated 148,181 ㎏/day. 1,218,715 ㎏/day. 56,315 ㎏/day. 1,915 ㎏/day, 46,756 ㎏/day and 1.172 ㎏/day. respectively in flood season and 27,763 ㎏/day. 143,787 ㎏/day. 6,195 ㎏/day, 845 ㎏/day. 6.518 ㎏/day and 748 ㎏/day, respectively in dry season. Estimated pollutant loads were more than results of Cho. et al.[1998] in flood season but were lower than those in dry season.