• 한국수산과학회지
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• 제30권6호
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• pp.964-973
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• 1997

A tidal prism eutrophication model, an one-dimensional intertidal model, is developed to study water quality conditions at small coastal basins and tidal creeks. The model simulates the physical transport processes using the concept of tidal flushing. The concept is simple and straightforward, and thus is ideal for small coastal basins with complex geometry. The model, having twenty-four state variables in the water column, simulates salinity, temperature, dissolved oxygen, three algal groups, and the cycles of carbon, nitrogen, phosphorus and silica. The model is applied to the Lynnhaven Bay, a small coastal basin of Chesapeake Bay in U.S.A. The model is calibrated using the field data collected in 1994, and then is verified using the independently collected data in 1980. The model overall gives a good reproduction of the field data, partly owing to the data collected from the field surveys specifically designed for the model application. This paper presents the procedure, and the results of the model calibration and verification.

• 한국해안·해양공학회논문집
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• 제28권3호
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• pp.160-170
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• 2016

본 연구에서는 조석 유입구에서의 단면통과 유량 및 조량 산정을 목적으로 목포해역 내 조석 유입구에서 ADCP를 이용한 단면 유속관측이 수행되었다. 우선, 원시 관측자료는 지배적인 유속성분 도출을 위하여 단면의 회전정도를 고려한 좌표회전이 수행되었으며, 정규화를 통하여 수평/수직방향 Sigma 좌표로 변환되었다. 또한, 관측이 이루어지지 않는 저면과 수면 근처의 Blank zone 데이터는 von-Karman 유속분포식을 이용하여 보간되었다. 보정된 자료를 이용하여 단면통과 유량이 정량적으로 산정되었는데, 조석에 따른 단면통과 유량의 변화양상 뿐만 아니라 목포해역의 낙조우세적 조석특성이 잘 나타나는 것으로 확인되었다. 또한, 과거 연구들에서 제시되는 조량 산정자료의 조석조건을 보완하여 현장 관측자료에 기반한 조량산정 방법의 조건이 재정립되었으며, 새로운 정의에 근거하여 조석 유입구에서의 단면 유속관측 자료를 이용한 조량의 정량적 산정이 국내 최초로 수행되었다. 조량 산정결과는 과거 연구들로부터 도출된 조량과 조석 유입구 흐름 단면적의 상관관계 결과와 비교 분석되었으며, 산정된 결과는 과거 연구결과들과 잘 일치하는 것으로 나타났다.

• 물과 미래
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• 제15권1호
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• pp.43-56
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• 1982

본 연구에서는 우리나라 서해안의 남부, 중부에 위치하고 있는 11개 해만에서 실측한 자료를 이용하여 평균상태에 이르고 있는 해만의 특성을 구명하기 위하여 평균대조기 최대조량($P_n$), 평균대조기 평균조량($P_n$) 및 평균소조기 평균조량($P_n$) 등 세가지와 본 해만인구의 최소횡단면적과의 상관관계를 구명하였다. 해만의 횡단면적과 조량간의 상관연구에서 $P_n$가 상관이 잘되고 있어 $P_n$ 상관식이 평행흐름에 지배적인 요인이라는 것을 알 수 있었으며 이 $P_n$ 상관식을 미국 태평양 연안에서의 비교한 바 비슷한 결과가 나왔다. 본 연구에서 얻어진 상관식은 다음과 같다. $A=9.078{\times10^{-4} P_n^{0.865}$ $A=3.048{\times10^{-3} P_n^{0.808}$ $A=2.30{\times10^{-2} P_n^{0.730}$상기 세가지 식을 이용하여 조사되지 않은 해만에 대해서도 횡단면적만 알 수 있다면 일정기간 동안 유출입하는 조량, 평균유속을 간접적으로 산정할 수 있어 해만의 안정성 검토에 활용될 수 있을 것이다.

• 한국수산과학회지
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• 제18권2호
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• pp.101-108
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• 1985

거제만의 물질수지와 굴양식장관리를 위한 해양환경개선 및 해양공학적 기초자료를 마련코저, 1984년 8월의 대조기 23시간 및 소조기 13시간 동안 거제만입구의 단면에서 연속측류와 측심 및 채수를 실시하였다. 거제만의 해수교환과 그 기구에 관한 결과는 다음과 같다. 1. 거제만입구의 해수류출입현상은 만의 중앙부 및 육구단측이 만의 서부인 아지랑측보다 담수유출이 많은 우기에 유출이 우세하고 건기에는 상층에서 유출되나 저층에서는 유입이 우세하였다. 2. 해수교환율은 대조기 $26\%$, 소조기 $5{\sim}15\%$ 범위이다. tidal prism에 의한 체류시간은 대조기 약 48시간, 소조기 약 81시간으로 나타났다. 그러나, 해수교환정도는 교환개념과 수문기상학적 요소 및 계절에 따라 변동된다. 3. 협수도에 접한 거제만은 지형과 조류의 영향으로 와류현상이 활발하다. 따라서, 거제만은 지형성 와류가 해수교환에 미치는 영향이 클 것으로 추정된다.

• 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.

• 한국해양학회지
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• 제7권2호
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• pp.86-97
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• 1972

The tides, tidal currents and tidal prisms at Inchon Harbor are studied with recent data. The tides at Inchon Harbor is of semi-diurnal type having a spring range of 798cm and a phase age of 2 days. The monthly mean sea level at Inchon has a maximum at August and a minimum at January with a annual range of about 40cm. the tidal currents at Inchon Outer Harbor are of semi-diurnal type same as tides and nearly reversing type. The flood and ebb currents set north and south with a velocity of about 90-175 cm/sec and 120-225 cm/sec at spring tide and begin 0.2 hours after L.W. and 0.7 hours after H. W., respectively. Non-tidal currents flow southward with 10-20 cm/sec at west side of the stream and northward with 15-20 cm/sec at east side of the stream at Inchon Outer Harbor. The flood volume through the Inchon Outer Harbor fluctuates fortnightly from 590 10$\^$6/㎥ spring tide to 260 $10^6/m^3$ at neap tide and ebb volume changes from 470 $10^6/m^3$ at spring tide to 200 $10^6/m^3$ at neap tide, respectively. The flow area along the channel to the Estuary of Yeomha is controlled by the tidal prism as expressed by $A=1.14{\times}10^{-4}P^{0.966}$

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.519-519
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• 2023

Estuarine dams are a recent and global phenomenon. While estuarine dams can provide the benefit of improved freshwater resources, they can also alter estuarine processes. Due to the wide range of estuarine types and estuarine dam configurations, the effect of estuarine dams on estuaries is not well understood in general. To develop a systematic understanding of the effect of estuarine dam location and freshwater discharge interval on a range of estuarine types (strongly stratified, partially mixed, periodically stratified, and well-mixed), this study used a coupled hydrodynamic-sediment dynamic numerical model (COAWST) and compared flow, sediment transport, and morphological conditions in the pre- and post-dam estuaries. For each estuarine type, scenarios with dam locations at 20, 55 and 90 km from the mouth and discharge intervals of a discharge every 0.5, 3, and 7 days were investigated. The results were analyzed in terms of change in tide, river discharge, estuarine classification, and sediment flux mechanism. The estuarine dam location primarily affected the tide-dominated estuaries, and the resonance length was an important length scale affecting the tidal currents and Stokes return flow. When the location was less than the resonance length, the tidal currents and Stokes return flow were most reduced due to the loss of tidal prism, the dead-end channel, and the shift from mixed to standing tides. The discharge interval primarily affected the river-dominated estuaries, and the tidal cycle period was an important time scale. When the interval was greater than the tidal cycle period, notable seaward discharge pulses and freshwater fronts occurred. Dams located near the mouth with large discharge interval differed the most from their pre-dam condition based on the estuarine classification. Greater discharge intervals, associated with large discharge magnitudes, resulted in scour and seaward sediment flux in the river-dominated estuaries, and the dam located near the resonance length resulted in the greatest landward tidal pumping sediment flux and deposition in the tide-dominated estuaries.

• 한국환경과학회지
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• 제7권3호
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• pp.311-320
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• 1998

The volume transport and turnover time of the Deukryang Bay. located at the southern area of Korea, were calculated based on the current meter(RCM-7,ACM 16M) data observed at the three gateways of the tegrating observed data and then averaging on time. dangdo and Kogumdo. The total water volume transports through three entrances of the bay in May and October were $3.9{\times}10-2Sv, 3.4{\times}10^{-2}Sv(1Sv=10^6m^3s^{-1}$) and turnover time were 0.97day, 1.12day, respectively. Semidiurnal tides were predominant (70~85%). The water volume transports by residual currents were 2~4% of total water volume transports . The average fraction of fresh water calculated by tidal prism method using salinity difference between inflow current and outflow current through three entrances In Deukryang Bay was about 0.06% of total volume and the flushing time of fresh water was estimated as 0.97day.