진동수로 내장 해수교환방파제의 수로길이 변화에 따른 수위공진

이달수,오영민,전인식,김창일,Lee, Dal-Soo,Oh, Young-Min,Chun, In-Sik,Kim, Chang-Il 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.suppl3

The seawater exchange breakwater equipped with an oscillating water channel and water transmitting pipes has a very spectacular function that seawater supply can be greatly increased due to the upsurge of the water surface inside the channel at resonance condition which can be reached when the incident wave period becomes close to the natural period of the channel. The variations of the water level and period inside the channel are very important factors in enhancing the efficiency of sea water exchange, especially when designing the breakwater cross-section in shallow water zone which requires longer resonance period with the elongated horizontal projection of the channel. In the present study, a hydraulic experiment was performed varying the length of the oscillating channel, and the resonance periods and water surface variations are analyzed in terms of water transmission through the pipes.

해수교환방파제의 형상별 순유입유량 특성 비교

이달수,이창훈,오영민,전인식,김창일,Lee, Dal-Soo,Lee, Chang-Hoon,Oh, Young-Min,Chun, In-Sik,Kim, Chang-Il 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.suppl3

The seawater exchange breakwaters can be effectively employed to conserve or enhance the water quality inside harbors by transmitting the exterior water into the harbor. In the present study, three shapes of the breakwater, that is, the flow conduit embedded type, the wave chamber type and the oscillating water channel type are compared far their water exchanging capability through regular wave experiments. The results show that the net influx of water appears differently depending on wave period for each breakwater type. The net influx of the wave chamber type is much greater than that of the flow conduit embedded type. It is also ascertained that the influx of the oscillating water channel type can be greatly enhanced by attaining the resonance condition inside the channel at the wave periods frequently occurring at the fields where the breakwaters are to be installed.

마루높이가변월류제를 적용한 여수신항 Big-O구역의 해수교환율 향상방안

이달수(Dal Soo Lee),오상호(Sang.-Ho Oh),김건우(Gunwoo Kim),박성진(Sung Jin Park),김태인(Tae In Kim) 한국해양환경·에너지학회 2009 한국해양환경·에너지학회 학술대회논문집 Vol.2009 No.11월

본 연구에서는 해수가 정체된 여수신항 Big-O구역으로 파력을 이용하여 외해수를 유입함으로써 해수교환율을 향상시키는 효과적인 공법을 마련하여 제시하였다. 정체된 수역에 파력을 이용하여 외해수를 유입하면 해수교환율이 향상될 뿐 아니라 산소가 함께 공급되므로 수질 자정능력이 크게 향상된다. 월류제와 유수지를 설치하는 형식은 현존하는 해수교환방파제 형식 중 해수유입성능이 가장 우수할 뿐 아니라 전달파고가 거의 발생하지 않으며 도수로를 설치하면 원거리까지도 이송이 가능하다. 이 형식은 동해안의 주문진항에 설치되어 그 탁월한 성능이 검증되었다. 그러나 이 형식은 월류제의 마루가 수면으로부터 멀어질수록 유입유량이 크게 감소되는 단점이 있어 조수간만의 차이가 큰 해역에서는 적용하기가 곤란하다. 본 연구에서는 월류제의 상부에 Radial Gate를 설치하고 이 Gate의 상부가 장기 예측된 조위와 자동적으로 일치되도록 조절되는 마루높이가변월류제를 구상함으로써 상기 단점을 극복하였다. 서방파제 기부 외측에 단면이 작은 가변월류제 67m를 설치하고 유수지로부터 1.2㎞ 떨어진 Big-O구역까지 직경 2.7 m의 도수 파이프를 설치하여 외해수를 자연유하시키면 월평균 약 1,100,000㎥의 외해수가 유입되는 것으로 추산된다. 이는 Big-O구역의 1개월 해수교환율을 현재의 10%에서 70%로 향상시키는 결과를 가져온다. 아울러 이 공법을 적용하면 외해수가 4-9월에 집중적으로 유입되므로 항내 수질을 개선하기 위해서는 외해수의 유입이 수온이 높은 여름을 포함하여 초가을까지의 기간에 집중적으로 이루어져야 하는 중요한 조건을 잘 만족하고 있다. An effective method of improving seawater exchange rate at the Big-O zone in the Yeosu new harbor was proposed to promote seawater inflow into the harbor by utilizing the wave power. When fresh seawater is supplied to the stagnated waters, the self-purification capability is also improved thanks to the supply of oxygen besides the improvement of seawater exchange rate. It is known that the seawater exchange system composed of the overflowing levee and the water pool shows best performance in seawater inflow capability among the existing seawater exchange breakwaters. This system has more advantages of less wave transmission and easy transportation of seawater through pipelines to far distance from the inlet. It was already constructed at Jumunjin harbor on the Korean east coast and the water quality there was greatly improved since its operation. However, it was difficult to apply this system to a sea area of large tidal fluctuation since the inflow discharge is greatly diminished as the vertical distance between the levee crest and the water surface becomes large. In this study, this shortcoming of the conventional system was overcome by introducing the variable-crest overflowing levee, by which radial gate is installed on the top of the levee and the top plane of the gate is automatically coincide with the predicted tidal elevation. By constructing variable-crest levee of 67 m at the outside of base point of the western breakwater and installing pipelines of 2.7 m diameter to the Big-O zone that are 1.2 ㎞ away from the water pool, approximately 1,100,000 m3 of seawater is estimated to enter into the Big-O zone per month on average. This leads to substantial increase of the monthly seawater exchange from current 10% up to 70%. By applying this method, moreover, most of the seawater inflow occurs from April to September, which satisfy the requirement of intensive seawater inflow during summer and early autumn season of high temperature.

해수교환방파제의 L자형 수로에서의 수위 공진 2. 불규칙파 실험

이달수(Lee Dal Soo),이창훈(Lee Changhoon) 대한토목학회 2002 대한토목학회논문집 B Vol.22 No.2B

경사식 방파제의 사면 변형에 관한 실험연구

이달수(Dal Soo Lee),염기대(Ki Dai Yum),김창일(Chang Il Kim),오영민(Young Min Oh) 대한토목학회 2003 대한토목학회 학술대회 Vol.2003 No.10

투수성 블록 2층적으로 구성된 잠제의 기본설계법 연구

이달수(Lee, Dal Soo),오상호(Oh, Sang-Ho),박이동(Park, Yi-Dong),정원무(Jeong, Weon-Mu) 한국해안해양공학회 2013 한국해안해양공학회 논문집 Vol.25 No.3

이 연구의 초점은 실험적 연구결과를 바탕으로 투수성 블록 2층적으로 구성된 잠제에서 목표 전달파 성능을 만족시키는 잠제의 제원을 결정하거나 혹은 잠제 제원이 주어졌을 때 전달파고비를 예측하는 기술을 제시함에 있다. 이를 위해서 테트라포드 및 삼각뿔블록을 이용한 수리모형실험을 수행하고 실험자료의 분석과정에서 파라메터 K_Th_b/h를 도입 제안하였다. 실험자료의 분석을 통해 얻어진 선형 회귀식을 이용하면 잠제가 전달파고를 크게 감소시키는 여건에서는 잠제의 마루수심 변화에 대응하여 전달파고비를 쉽게 예측하는 것이 가능하였다. 이 방법은 서로 다른 블록을 사용하여 구성된 잠제의 전달파 특성을 비교하고, 블록의 소요수량을 추정함에도 효과적으로 이용될 수 있을 것이다. The focus of this study is to provide a method for determining the dimension of a submerged breakwater satisfying the target transmission performance or predicting the transmission coefficient of a given structure. This method was developed based on data analysis of the physical experiment that was carried out by using the submerged breakwater composed of double-layer permeable blocks. Two different armor blocks of Tetrapod and Triangular Pyramid Block were used in the experiment. The parameter K_Th_b/h was introduced in the analysis of the measurement data. By using the linear regression line deduced from the analysis of the experimental data, it was possible to readily predict the wave transmission coefficient irrespective different water depths at the crest of the submerged breakwater, under the condition of significant decrease in transmitted wave height due to the submerged breakwater. This method can be effectively utilized for estimating the necessary number of blocks used for the submerged breakwater as well as comparing the transmission characteristics of the submerged breakwater according to use of different armor blocks.

사석마운드 위에 설치되는 조력발전용 수문 케이슨의 통수성능에 대한 실험적 연구

이달수(Lee, Dal-Soo),오상호(Oh, Sang-Ho),이진학(Lee, Jin-Hak),박우선(Park, Woo-Sun),조휴상(Cho, Hyu-Sang),엄현민(Eum, Hyun-Min) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.2

The change of water discharge capability of sluice caisson for tidal power plant according to installation of the rubble mound was investigated by performing laboratory experiment. The experiment was carried out in an open channel flume with a great care to measure flow rate and water level in the flume accurately. Eight different sluice caisson models were used in the experiment. The water discharge capabilities of seven sluice models decreased with respect to the placement of the rubble mound, while increased for only one sluice model. On average, the values of discharge coefficient decreased by approximately 10% when the sluice models were placed on the rubble mound. It is concluded that the shape of the rubble mound can affect the water discharge capability of the sluice caisson, so that its shape should be significantly considered in the design of the sluice caisson, especially when it is deployed in a site of relatively deeper depth.

조력발전용 수문 형상에 따른 통수성능에 관한 실험적 연구 - II. 실험결과 및 분석

이달수(Lee, Dal-Soo),오상호(Oh, Sang-Ho),이진학(Yi, Jin-Hak),박우선(Park, Woo-Sun),조휴상(Cho, Hyu-Sang),안석진(Ahn, Suk-Jin) 한국해안해양공학회 2008 한국해안해양공학회 논문집 Vol.20 No.1

이 연구에서는 개수로시스템에 설치된 조력발전용 수문(sluice)에 대한 수리모형실험을 수행하여 취득된 자료의 분석 결과를 제시하였다. 실험은 수문 최소단면의 폭 및 바닥높이가 서로 다른 여섯 가지 수문 모형에 대하여 이루어졌다. 수문의 측면형상이 같을 경우에 수문 최소단면의 폭을 증가시킴으로써 수문의 유량계수는 대체로 증가하였지만, 유량이 작고 수문 상류측의 수위가 낮을 때는 유량계수가 증가하다가 감소하는 경향이 나타났다. 또한, 최소단면의 폭에 무관하게 최소단면의 바닥높이가 높은 경우에 유량계수가 크게 나타났다. 실험결과로부터 기존의 타당성조사 사업 등의 수문 설계시에 주로 적용하였던 유량계수 값은 과소산정되었으며, 따라서 유량계수 값을 상향조정하여 사용하는 것이 타당하다는 결론을 얻었다. In this study, the analysis results were presented for the experimental data of sluice for tidal power generation that were installed in an open channel flume. The experiment was carried out for the six different sluice models of different widths and bottom heights of the sluice throat section. If the side shape of the sluice was the same, the coefficient of discharge generally increased by increasing the width of the throat section. However, when the water discharge was small and the upstream water level was low, the coefficient of discharge increased for a while but decreased later with the increase of the throat section width. In addition, the coefficient of discharge was larger when the bottom height of the throat section was higher, regardless of the width of the throat section. It was concluded that the values of coefficient of discharge that were frequently used in the previous feasibility studies were underestimated so that should be adjusted to higher values.

인공섬 형식 해수교환시설의 단면 및 평면 수리모형실험 비교

이달수(Lee Dal Soo),김창일(Kim Chang Il),오상호(Oh Sang-Ho),팽재신(Paeng Jae Sin) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

매블록의 수리특성에 관한 실험적 연구

이달수(Lee Dal Soo),오상호(Oh Sang-Ho),이오진(Lee O-Jin) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10