개발에 의해 조성된 매립지의 기후특성(Ⅱ)

도근영(Doe Geun-Young),김가현(Kim Ga-Hyun),이승휘(Lee Seoung-Hwi),옥치율(Ok Chi-Yool),강대석(Kang Dae-Suck) 동아대학교 해양자원연구소 2003 동아대학교 해양자원연구소 연구논문집 Vol.15 No.-

This study started with the measured experiment of climatic characteristic at the coastal reclamation area formed by the reclamation and development which is inevitable selection presently. As a result of the examination, the climate variation is predicted to be large in summer and the salt concentration is shown in the order of top layer, bottom layer and intermediate layer. Therefore, the greens space and wind path are occupied at the coastal reclamation.

염수로 포화된 해안지역 대수층을 활용한 수자원확보 방안

정은태(Eun Tae Jung),박남식(Namsik Park),김인철(In Chul Kim),이승휘(Seoung Hwi Lee) 한국해안해양공학회 2015 한국해안해양공학회 논문집 Vol.27 No.5

해수침투로 인하여 부존되어 있는 지하수의 염분농도가 높아 방치되고 있는 해안지역 대수층을 활용한 수자원 확보 방안을 제안하였다. 대수층으로 담수를 주입하여 염수를 치환할 수 있는 주입-양수 시스템을 연구하였다. 염수로 포화되어 있는 충적층에서 인공함양 및 회수 기술이 성공하기 위해서는 양수정으로 유입되는 염수를 방지하는 것이 가장 중요한 문제 중의 하나이다. 본 연구에서는 양수정을 염수 침투로부터 방지하기 위한 염수포획관정의 효과를 수치모델링 방법으로 분석하였다. 적절히 설계된 염수포획관정은 담수 양수정을 염수침입으로부터 보호할 수 있음을 제시하였다. A new method is proposed for water resources using aquifers in coastal areas. These aquifers are generally filled with saline water due to seawater intrusion and consequently being left unutilized. Surface water can be injected into these aquifers and recovered for water quality enhancement and stored water. Injection and pumping wells are used. For this technique to be successful protection of pumping well from seawater intrusion is an essential issue. Salt water pumping can be used to prevent saline water upconing. Numerical analysis demonstrated that a properly designed and executed salt water pumping well can protect a freshwater pumping well from salt water intrusion.

테트라포드로 피복된 사석경사제의 상치콘크리트에 작용하는 파력과 안정성

김인철 ( In-chul Kim ),박한주 ( Han-ju Park ),이승휘 ( Seoung-hwi Lee ) 한국환경기술학회 2017 한국환경기술학회지 Vol.18 No.2

월파량을 저감시키고 사석제체의 마루높이를 낮추어 제체의 사석량을 줄이는데 기여하고 방파제의 마루를 따라 보행자 및 차량의 접근을 용이하게 하는 상치콘크리트와 제체의 전면에 테트라포드로 피복된 사석경사제는 국내에 가장 많이 시공되어 있다. 사석경사제에 태풍이나 해일이 내습하는 경우, 설계조위보다 높은 이상조위로 인하여 발생되는 월파로부터 방파제의 마루부에 있는 소파블록 및 상치콘크리트가 파손되어 제 기능을 발휘하지 못한다. 이러한 피해상황을 미연에 방지하기 위하여 상치콘크리트에 작용하는 파력의 특성과 구조물의 안정성을 파악하기 위하여 수리모형실험을 수행하였다. 상대여유고(Rc/H)가 감소하고 주기가 증가함에 따라 상치콘크리트에 작용하는 파력은 증가한다. 그리고 사석경사제의 상치콘크리트는 안정계수가 1.1을 초과할 때 미끌림에 대하여 안정하다. In Korea, a rubble mound breakwater covered with on the front of the structures is mostly constructed with concrete cap at its crest because concrete cap contributes to reduce the amount of the overtopping water and provides pedestrian and vehicular access onto and along the crest of rubble mound breakwater. In case of typhoon and storm surge against the rubble mound breakwater, the existing dissipating blocks and concrete cap doesn`t function very well due to the wave overtopping caused by abnormal level higher than design tide level. In order to prevent the above mentioned damages in advance, laboratory experiments were conducted to study the characteristics of wave forces acting on the concrete cap and its stability. The wave forces acting on a cap concrete are found to be increase with decreasing relative freeboard(Rc/H) and increasing wave period. The cap concrete of rubble breakwater is stable when safety factor against sliding exceeds 1.1.

해안 잠재 수변공간 개발 대상지 선정에 관한 연구 - 기장군을 중심으로

민병형(Min Byung-hyung),김가현(Kim Ga-Hyun),유상호(Yu Sang-Ho),민상철(Min Sang-Chul),이승휘(Lee Seoung-Hwi) 동아대학교 해양자원연구소 2002 동아대학교 해양자원연구소 연구논문집 Vol.14 No.-

  This study is to determin digging and development preferential ranking which is the potential area of seafront in Busan Kijanggun according to rise citizen of literary life and increase desire of culture life.<BR>  Obtained results of this study are summarized as follows.<BR>  1. Decide to development preferential program that eight area selected from the potential area of seafront to position in Busan kijjanggun.<BR>  2. Appraisal standardⅠ decided to development preferential program which is Yunhwa gigu, Yonggung temple, Juksung estuary, Sirangdae, MunJung? Mundong harbor, Seoam harbor, Hoyamlee and Sinpyung harbor.<BR>  3. Appraisal standardⅡ decided to development preferential program which Yunhwa gigu, Yonggung temple, Juksung estuary, Hoyamlee and Sirangdae, Seoam harbor, Sinpyung harbor and MunJung?Mundong harbor get the same grade.<BR>  4. As a result of comparative appraisal standardⅠ,Ⅱ is that first~third program is equal but it was changed from fourth program.<BR>  5. When potential area in seafront appraised by Lee unit, appraisal standardⅠ is superior than appraisal standardⅡ.

Boussinesq 방정식에서 조파, 흡수 및 반사에 관한 연구

김인철,이승휘 東西大學校 1999 동서논문집 Vol.5 No.-

The purpose of this study is to observe the applicability for wave generation wave energy absorption by sponge lauer and reflection in Nwogu's extended Boussinesq wave model. To accomplish these objective, the numerical model using Enquist and Majda's(1977) method as nonreflective boundary condition is applied to wave fields with a constant water deoth. From this study, it is found that waves are well propagated towards downstream and sponge layer at end of the domain works quite well to dissipate wave energy. The model applied to generate monochromatic waves with various periods or amplitudes shows very very close to the their target value for the individual cases. These results indicate that model can be applied to simulate one of nonlinear waves, random waves, reflective waves.

上戰荷重에 의한 水平上壓에 대한 考察

李萬烈,李承輝 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.1

The elastic theory is generally used to calculate lateral earth pressures due to surcharge loads, but this was sometimes discord with the measurements fo lateral pressures on the condition of surcharge loads. In this study, the methods to obtain the lateral pressures, the elastic and the plastic theories and the empirical methods, applied to the results of measurement on the condition of surcharge loads. As a result, it showed that the lateral pressures obtained by the earth pressure coefficient times the vertical stress calculated by the elastic theory should be not used. For the surcharges of point load, the Mindlin's method agreed roughly with the results of measurements when the distance from a surcharge to a wall, a, was less than about 0.5times of the depth, and the Boussinesq's method was in closely accord with them when a>0.5. For the surcharges of line and rectangular loads, it was difficult to look for the trend between the calculated values and the measurements, because of the insufficiently measured data. Especially, the application of the elastic theory showed the overestimated results when the surcharges of rectangular loads were distant from the wall.

방류관거의 안정성에 대한 실험적연구

김가현,이승휘,유상호 慶南專門大學 2000 論文集 Vol.28 No.1

규칙파를 이용한 방향 스펙트럼 추정방법

김가현,이승휘,민일규,이정환 慶南專門大學 1999 論文集 Vol.27 No.1

海雲臺 海濱 侵蝕防止에 관한 實驗的 硏究 : 突堤 및 離岸堤의 組合構造物에 대하여

閔丙亨,李承輝,민일규 東亞大學校 海洋資源硏究所 1988 硏究論文集 Vol.1 No.1

Recently the HAEUNDAE beach has an impact on intense erosion phemomena. At this point, the purpose of this study is to examine the sedimentation effect by using a three-dimensional hydraulic model test when a jetty is set up. jetty From the results of the experiment it can be concluded that the optimum length of jetty would be L₁=300m, direction angle would be θ=22.5°when, H=3.0m and T=8.0 sec. A jetty and offshore breakwater are also considered as a compound structure. From this experiment the optimum length of offshore breakwater would be L₂=200m. A jetty and T-Type jetty are also comtemplated as compound structure. From this experiment the optimum length of T-Type jetty would be L₃=300m.

남사천 하류지역 홍수피해 분석 연구

김가현,이승휘,서진호,민일규,이영재 동아대학교 건설기술연구소 2000 硏究報告 Vol.24 No.1

Where no records are available at a site, a preliminary estimate may be made from relations between floods and catchment characteristics. Anumber of these characteristics were chosen for testing and were measured for those catchments where mean annual flood estimates were available. Although the improvement using extended data in regression of flood estimates on catchment characteristics was small, this may be due to the limitations of the regression model. When an individual short term record is to be extended, more detailed attention can be given; an example is presented of the technique which should be adopted in practice, particularly when a short term record covers a period which is known to be biassed. A method of extending the peaks over a threshold series is presented with a numerical example. The extension of records directly from rainfall by means of a conceptual model is discussed, although the application of such methods is likely to be limited by lack of recording raingauge information. Methods of combining information from various sources are discussed in terms of information from catchment characteristics supplemented by records, but are generally applicable to different sources of information. The application of this technique to estimating the probable maximum flood requires more conservative assumptions about the antecedent condition, storm profile and unit hydrograph. It is suggested that the profile and catchment wetness index at the start of the design duration should be based on the assumption that the estimated maximum rainfall occurs in all durations centered on the storm peak.