碎波帶內의 沿岸流 流速分析 特性을 考慮한 漂砂解析

咸契運,金基興 慶尙大學校 工科大學 附屬 生産技術硏究所 1985 生産技術硏究所論文集 Vol.1 No.-

In this paper, authors intented to calculate littoral drift with consideration of Radiation Stress in surf-zone. It is rational to calculate distribution of longshore current velocity (v) in field. With the ? authors calculated littoral drift at each points in surf-zone and compare to the others calculation methods. Discussed and calculated results are as follows; 1. The method by radiation stress concept is more pratical to understand the mechanism of longshore current velocity and littoral drift in surf-zone. 2. The longshore current velocities curve are ial type. 3. Calculated results have larger values than others methods and the cause could be predict to ignore the effect for lateral mixing friction stress.

Radiation Stress 에 의한 尙州海水浴場의 局所 海濱流 解析

咸契運,張大正,安庚模 慶尙大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.14 No.-

In this paper, authors analyzed to discuss on the near-shore current characteristics at the vicinity of groin with radiation stress concept. And authors calculated on the near-shore current velocity at SANGJU beach. Discussed and calculated results are as follows; 1. With the analysis results, near-shore current velocity is about 4 times that's of non-groin and radiation stress is about 3 times that's of non-groin. 2. The pattern of near-shore current is very important to sediment movement. 3. In this study, to compare numericial analysis with esbablished data was qualitatively harmonized.

碎波帶 외부에서 Return Flow에 관한 實驗的 硏究(Ⅰ)

咸契運,張大正 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-

The vertical distribution of eddy viscosity is discussed to the customary types which are the constant, the linear function and the exponential function. Each coefficient of the eddy viscosities which sensitively affect the precision of solutions is uniquely decided from the additional boundary condition which the velocity becomes zero at the wave trough level. Also the boundary conditions at the bottom and the continuity relation are used in the integration of the governing equation. The theoretical solutions of present model are compared with the various experimental results. The solutions show a good agreement with the experimental results in the case of constant or exponential function type eddy viscosity.

Radiation Shear Stress에 의한 沿岸流 流速分布 特性에 관한 解析(2) : 水評混合應力을 考慮한 경우

咸契運 慶尙大學校 1984 論文集 Vol.23 No.2

1. 孤立波理論을 適用한 碎波帶內에서의 沿岸流流動分布는 포물선 分布임이 確認되었다. 2. 沿岸流 流動의 變化에 支配的인 因子는 底面摩擦임이 確認되었다. 3. 本人의 沿岸流流動分布曲線의 理論値가 徵小振幅波 適用時의 값보다 다소 큰 값을 보이고 있다. 앞으로 亂類에서의 Reynold 應力을 고려한 沿岸流流速의 變化도 계속 究明하고자 한다. In this paper, author intented to discuss the Longshorecurrents characteristics in the breakzone with the Radiation Shear Stress concept in the consideration with the effect for the Lateral Mixing Friction (Lx). And author calculated longshore-current velocity variation according to wave condition. Discussed and calculated results are as follows ; 1. The longshore-currents distribution are parabola from breaking point to shoreline by solitary wave theory. 2. Maximum velocity point exist in breakzone. 3. The bottom friction is the most factor affecting the velocity of Longshore-Currents.

쌍곡선 모형에 의한 삼천포 항내 정온도 분석

함계운,박준일,장대정 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

The calmness inside a harbor plays an important role in the appropriate disposition of harbor structures. However, it is not easy to get the accurate computational results because it is affected by many factors concerning with the wave transformation. Recently, numerical model tests which are more economic and rapid than hydraulic model experiments, are carried out for the purpose of analyzing wave height distribution in harbors. This paper presents the numerical model which is able to calculate wave height inside a harbor. It is based upon the time-dependent mild slope equation involving wave refraction, diffraction, shoaling effect and reflection. In particular, the arbitrary reflectivity is used at the boundary in order to simulate the real harbor reflection condition. The proposed numerical model is applied to Samcheon port in order to investigated harbor calmness.

緩傾斜方程式을 사용한 尙州海濱의 海濱流 解析

咸契運,張大正 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

Maruyama and Kajima(1985) model, based on the time-dependent mild slope equation, is employed in computing wave transformations involving refraction, diffraction, and energy dissipation by the wave breaking in the surf zone. For the radiation stress, to offer the driving force to the wave-induced currents, Watanabe and Maruyama(1986) formula is used because of being relatively simple and being able to minimize the numerical error. To calculate the wave-induced currents, the depth-integrated and time-averaged continuity and Navier-Stokes equations for incompressible fluid are made use of, and solutions for them are numerically obtained by using a finite difference method.

尙州海水浴場의 砂濱侵蝕 原因과 養濱對策

咸契運 慶尙大學校生産技術硏究所 1987 生産技術硏究所論文集 Vol.3 No.-

Coastal development can affects coastal zone process as follows ; 1. Change the rate of sediment supplied to the coast. 2. Characteristics of sediment supplied to the coast. 3. A justing the level of wave energy flux to the coast. 4. Directly interfering with coastal sediment transport process. Improvement plan for HANREA National Ocean park, SANGJU Beach repaired river channel, constructed jetty and seawall. After project worked, serious erosion of beach profiles proceed now. In this study, author analyzed the causes for the eroison factors and propose the beach nourishment methods at SANGJU Beach. The results for the investigation and analysis as follows ; 1. The structures construction project of coastal development of SANGJU Beach do not regard adverse physical impacts including erosion of beach, littoral currents change and wave deformation vicinity of jetty. 2. With a weir-jetty, a off-shore breakwater, and sloped seawalls system, it is possible to improve adverse impacts of littoral net transport and to make dynamic equilibrium process.

원형 파일의 파압분포특성에 관한 실험적 연구

함계운,박준일,장대정 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

The computation of the water wave forces on offshore structures is one of the primary tasks in the design of the structures. It is also one of the most difficult tasks since it involves the complexity of the interaction of waves with the structures. The Morison equation assumes the wave force to be composed of inertia and drag forces linearly added together. The purpose of this paper is to investigate the wave forces acting on the cylinderical piles. Author set up a cylinderical piles model into 2 dimensional regular wave tank with vaned wave height, water depth, and wave period, and observed wave forced. In practice the wave forces depending on wave height, water depth, and wave period were predicted through the experimental model test. It is presented a good tool to predict qualitatively the wave forces acting on the cyinderical piles.

波浪의 쳐오름에 의한 護岸提脚部 海濱變形에 관한 實驗的 硏究

咸契運,申炳雨,徐在天 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

Wave run-up depends on seawall shape, seawall roughness, water depth at seawall toe, bottom slope and incident wave characteristic and beach deformation in front of seawall are return by wave run-up and wave deformation by shoaling. Because of the large number of variable involved, complete description of the beach deformation phenomenon is not avaliable in terms ranges of geometric variable and wave condition. This paper was analyzed beach deformation in front of seawall caused by experimental result of wave period, depth, seawall slope and seawall roughness.

전남 동부지역의 해수욕장 저질특성에 관한 분석

咸契運,申炯雨,徐在天 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

The grain distribution of beaches are measured by classification of sediments by grain diameter and this range is 2㎛ -200㎜. In this study it was used regions of Man Soung Ri beach and Nam Youl Ri beach and Bal Po beach in the Eastern Jeonnam. In this region Man Soung Ri beach was divided five sector, Nam Youl Ri beach was divided four sector, and Bal Po was divided four section. This paper was analyzed each beach are ever sector beach grain distribution and shore line in and out grain size distribution.