• 물과 미래
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• 제10권2호
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• pp.113-124
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• 1977

Alone the southwesten coast of Korean peninsula, the extensive available arable acreages suited for forming are found in the development of tidal flats in the geographically curved bays with a motable tidal emplitude. It was found that the developments of these tidal flats cover an estimated area more than 276,000ha. In this paper, a flood control system by Pul's Storage Indication Method and Pul's Graphical Method at Return Periods-50 yrs, design rainfall-267mm per 48hrs and design flood-926c.m.s. and at 0.2meter control height above the High Water Ordinary Spring Tide Level (+11.0m) was studied. At the result, the flood demage in the reservoir at Return Periods-50 yrs and the tidal level at H.W.O.S.T.L. were satisfied to the below E.L. 11.20m (Flood Level in the reservoir). Well skilled flood control technique and management and control of draining sluice gate should be required for the disaster prevention from the flood and tide damage.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.114-119
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• 2004

Floating marina has been interests as an alternative to the facilities for recreational boats because of its cost effectivenes and less environmental conflicts. For tile present research, a square floating marina with a length of 400m and draft of 5m was used. This marina can be extended to 800m by putting anotjer one together. Tidal field around tile marina was simulated using a multi-level finite difference method. Tidal motion was assumed sinusoidal in a closed rectangular bay. Velocities and residual current were investigated for two cases of single marina and two marinas installed in tile bay. It was found that the horizontal velocity fields from the water surface to the structure bottom around tile marina were affected. In the marina basin, magnitude of velocity was reduced considerably but overall quality of water circulation was preserved even after two marina were installed.

• 한국산학기술학회논문지
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• 제17권4호
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• pp.464-473
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• 2016

이산화탄소의 배출 증가와 지구온난화, 엘리뇨 현상, 라니냐 현상 등과 같은 이상기후 현상의 발생빈도 증가로 인하여 전 세계적으로 내륙과 해안의 온도가 상승하고 있다. 지구온난화로 인한 바닷물의 열팽창 그리고 빙하의 해빙 등으로 인한 지구의 해수면은 매년 2.0mm/yr(전 세계 평균값)의 속도로 상승하고 있다. 그러나 해안에 인접한 수리구조물 혹은 해안 수리구조물을 설계할 시 기준이 되는 설계조위는 과거 관측된 조위 값으로부터 4대 분조 및 조화상수를 분석하거나 수치모형 실험에 의해 결정된다. 따라서, 설계조위는 구조물의 설계빈도에 상응하는 해수면의 상승속도를 감안해야 할 필요가 있다고 사료된다. 본 연구에서는 국립해양조사원(Korea Hydrographic and Oceanographic Administration; KHOA)에서 운영하고 있는 46개소의 조위관측소를 대상으로 관측개시일부터 2015년까지 시단위로 조위자료를 수집하였다. 우리나라를 크게 남해동부, 남해서부, 동해남부, 동해중부, 서해남부, 서해중부, 제주로 총 7개의 해역으로 구분하여 월별, 연별 변동추이 및 연평균 상승률 분석을 수행하였다. 향후 국지적 해수면상승의 원인규명 및 설계조위 고려 시 기초자료로 활용가능 할 것으로 판단된다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.759-762
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• 2008

연안지역에 위치하는 하수처리장은 배제된 우수와 처리수를 해양에 방류하는 것을 고려한다. 현재 인천 학익하수처리장은 해안에 인접한 수면에 처리수를 직접 방류하는 표층방류 방법으로 설계되었다. 이러한 표층방류 방법은 조차(Tidal Range)가 큰 해안에서 방류수위가 조위(Tidal Level)보다 낮을 경우 방류관거로 해수가 유입하여 하수처리장내에서의 수리적인 문제를 유발할 수 있다. 본 연구에서는 하수처리장 방류관거로의 해수유입 방지를 위하여 방류맨홀에 Weir를 설치하는 방안을 제시하였다. 그리고 Weir의 설치에 따른 수리계산을 수행함으로써 그 적정성을 검토하였다. 수리계산 결과 방류맨홀에서 해수의 유입이 발생되지 않는 것으로 분석되었으며, 이로 인해 인천 연안의 기왕 고극조위 발생시에도 처리수의 원활한 배출이 이루어질 것으로 판단된다.

• 한국해양학회지
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• 제10권2호
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• pp.67-75
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• 1975

Tidal Flushing at the entrance channels of tidal bay or estuary in the central western coast of Korea; Gum River Estuary, Garorim Bay, Asan Bay, and Yeomha Estuary were studied with the recent data of current surveys measured by curret meter at three or five anchored stations along the section for one or two tidal periods at mean spring tide. Equilibrium relationship between tidal prism at mean spring tide and minimum flow area below the mean sea level of the channel in alluvial material was found as of O'Brien's (1931, 1969) study. Bed load transport in the tidal channel is balanced with the tidal flushing ability having a mean velocity of about 0.75m/sec or maximum velocity of about 1.25m/sec for a half tidal cycle over the section at mean spring tide which fairly agree with Brunn's study(1955, 1957). flushing actions for different hydraulic depth( mean depth) and bed material size in the channel were reviewed and found that it depend to a minor extent on the factors.

• 해양환경안전학회지
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• 제6권2호
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• pp.47-56
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• 2000

This paper describes a simple prediction method of beach recession induced by storm surge. In order to evaluate the severest beach erosion, it is assumed that maximum beach recession occurs at the coming of storm surge overlapped with spring tide. Consequently, total surge lev디 becomes the sum of storm surge level and tidal range. Generally, storm surge level around Korea is small compared with tidal range. Therefore total surge can be expressed as the series of surges, which have same duration as tide. Through the case studies, the author Investigates correlation between tidal range, duration, wave condition, beach slope and beach recession.

• 한국콘텐츠학회논문지
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• 제16권4호
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• pp.604-613
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• 2016

지구온난화로 인한 바닷물의 열팽창, 빙하의 해빙 등으로 지구의 해수면은 매년 약 2.0mm/yr의 속도로 상승하고 있다. 그러나 해안에 인접한 하천을 설계할 시 기준이 되는 외수위는 과거 관측된 조위 값으로부터 4대 분조 및 조화상수를 분석하여 결정된다. 따라서, 외수위는 구조물의 설계빈도에 상응하는 해수면의 상승속도를 감안해야 할 필요가 있다고 사료된다. 본 연구에서는 국립해양조사원에서 운영하고 있는 47개소의 조위관측소를 대상으로 관측개시일부터 2015년까지 시단위로 조위자료를 수집하였다. 우리나라를 크게 서해, 남해, 동해, 제주 총 4개의 해역으로 구분하여 연별 변동추이 및 연평균 상승률 분석을 수행하였다. 그리고 기존 설계된 해안에 인접한 하천의 외수위를 검토하였다. 추후 국지적 해수면상승의 원인규명 및 외수위 고려 시 기초자료로 활용될 것으로 판단된다.

• 전기학회논문지P
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• 제63권2호
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• pp.113-118
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• 2014

Tidal power is one of new and renewable energy sources. Tidal power is generated by using the gap in the water level between the water outside and inside the embankment. All tidal power plant in Korea were being operated by import of turn-key from abroad. The know-how and technology which are the most important to build predictive control system has become increasingly difficult to obtain from advanced countries because most of them avoid to transfer, which the domestic development of the control system is needed. In this paper, a study on start stop system at water turbine-generator for tidal power plant at the beginning of development was presented. For improvement the efficiency and develope of core technology of the start stop system, the technique and characteristics of tidal power, modeling, maximum generation calculation method, and optimal control of joint control system in Sihwa tidal power plant were studied.

• Ocean and Polar Research
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• 제24권1호
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• pp.63-71
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• 2002

This preliminary study on the changes of macrobenthic assemblages in experimental sediment fences was conducted as a part of tidal marsh restoration project. Intertidal sediment fences were designed to increase the efficiency of trapping sediments on unvegetated tidal flats in order to raise sediment elevation and to allow colonization of intertidal vegetation. Although increment of soil surface level was not observed over the first three months of the study, it was possible to obtain some effects of the sediment fence. Three months later, the particle sizes of the surface sediment at experimental plots became much finer compared to unfenced areas on the natural mudflats located in the same tide level as that of the plots. The difference was much greater on the plot with drainage canals than on the plot without ones. Species diversity of the experimental plots became much higher than that of natural sites. Perinereis aibuhitensis and Glauconome chinensis which were absent from initial community appeared with high density in the plot with drainage canals. Those species were significantly different in abundance between the experimental plot and the natural mudflat. Changes in species composition were not detected in another experimental plot without drainage canals.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2002년도 춘계학술대회 논문집
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• pp.257-262
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• 2002

Numerical model introduced in this study combines wave refraction-diffraction, breaking, bottom friction, lateral mixing, and critical shear stress and three sub-models for simulating waves, currents, and bottom change were briefly discussed. Simulations of beach processes and harbor sedimentation were also described at the coast neighboring Bangpo Harbor, Anmyundo, Chungnam, where the area has suffered from accumulation of drifting sand in a small fishing harbor with a wide tidal range. We also made model test for the case of a narrow tidal range at Nakdong river's estuary area to understand the effect of water level variation on the littoral drift. Simulations are conducted in terms of incident wave direction and tidal level. Characteristics of wave transformation, nearshore current, sediment transport, and bottom change are shown and analyzed. We found from the simulation that the tidal level impact to the sediment transport is very important and we should apply the numerical model with different water level to analyze sediment transport mechanism correctly. Although the model study gave reasonable description of beach processes and harbor sedimentation mechanism, it is necessary to collect lots of field observation data, including waves, tides and bottom materials, etc. for better prediction.