• 한국해양공학회지
• /
• 제23권1호
• /
• pp.31-37
• /
• 2009

Coastal vegetation consists of rooted flowering marine plants that provide a variety of ecosystem services to the coastal areas they colonize. The attenuation of currents and waves and sediment stabilization are often listed among these services. From this point of view, artificial seaweed is an effective method of controlling sea bed sediment and stabilization without damaging the landscape or the stability of the coastline. A series of hydraulic experiments were performed in a wave channel with regular and irregular waves to examine the effect of artificial seaweed in relation to scouring and beach erosion prevention. Based on the results of these experiments, the coastal vegetation model is efficient against scouring and beach erosion.

• 한국해안해양공학회:학술대회논문집
• /
• 한국해안해양공학회 2003년도 한국해안해양공학발표논문집
• /
• pp.18-27
• /
• 2003

The goal of the UN Framework Convention on Climate Change (UNFCCC) is to stabilize atmospheric CO2 concentration for preventing global warming in future. However, there are many unknown factors regarding stabilization of CO2 concentration. What level of concentration should be appropriate to prevent global warming？ When should we stop the increase of CO2 concentration\ulcorner What kind of countermeasures of reducing CO2 emission will be available for CO2 stabilization？(omitted)

• 한국환경과학회지
• /
• 제10권4호
• /
• pp.275-280
• /
• 2001

In an attempt to evaluate the possibility of producing an organic fertilizer using sediments from coastal farming areas, the chemical composition, bacteriological quality and heavy metals in the sediments alkalized by conditions : a 1:4 mixture of dry sediment to food wastes and the addition of 30% quicklime to the mixture. According to the classification standard for compost constituent by Higgins, all composts had a low or intermediate grade in T-N and $K_2O$ content, a low grade in $P_2O_5$ and a high grade in CaO and MgO content. Stabilization by quicklime and magnesium hydroxide is likely to inhibit th bacterial decomposition of organic matter and the actigity of pathogenic organic. Raising the pH of stabilized sediment to 12 for 2 hours(PSRP criteria of EPA) allowed 99.99% of the coliform group, fecal group and viable cell count to be reduced. the results suggested that the crude fertilizer produced by alkaline stabilization method was innoxious and thereby the sediments from coastal farming areas could be used as organic fertilizer.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2016년도 춘계학술대회
• /
• pp.130-131
• /
• 2016

Although many metals contaminated sediment from coastal area contain both anionic and cationic heavy metals, the current remediation technologies are not effective for stabilize heavy metals of both anionic and cationic elements from contaminated coastal region. the present work investigated the efficiency and mechanism of immobilization of Fe, Zn, Cr, Cu, Pb and Cd metal solutions in modified zeolite based biostimulant ball. Biostimulant ball containing acetate, nitrate and sulphate which are enhance the activity of marine microorganisms and it can act as electron donors and electron acceptors. Modified zeolite and chelating agent is greatly enhance the metal stabilization due to increased immobility of the analysed metals. The XRD, FT-IR and SEM of modified zeolite which cheating agents containing heavy metals were investigated. The results indicated that heavy metals could be effectively immobilized in modified zeolite and chelating agents in BSB added sediment. The immobilization of heavy metals in modified zeolite and chelating agents along with BSB could be due to stabilize of heavy metal cations. Immobilization of heavy metals using BSB with modified zeolite and chelating agent has lower cost effect and enhance the sediment quality.

• 한국해안·해양공학회논문집
• /
• 제31권4호
• /
• pp.209-220
• /
• 2019

해빈 안정화를 위해 거치되는 강성 구조물의 규모는 해빈의 자기 치유 능력이 구현되는 해빈 대순환 과정이 훼손되지 않는 범위에서 결정되어야 하나 최근 지나치게 대형화 되어 광폭 잠제도 빈번하게 차용되고 있는 실정이다. 이러한 시각에 기초하면 Irie et al.(1994)가 제안한 왜도 된 연흔모양 매트는 규모가 크지 않다는 점에서 현재 선호되는 광폭잠제의 대안이 될 수 있을 것으로 판단된다. 전술한 왜도 된 연흔모양 매트의 해빈 안정화 효과는 매트의 유수 단면 축소부에서 강제되는 와류가 run-down 시 외해방향으로 이송되는 표사를 얼마나 효과적으로 포획할 수 있느냐에 따라 결정되는 것으로 추정된다. 본 논문에서는 이러한 가설을 확인하기 위해 수치모의를 수행하였다. 수치모형은 Navier-Stokes 식과 물리기반 지형모형으로 구성하였으며, 모의 결과 왜도 된 연흔모양 매트 정점부에서 강제된 와류에 의해 포획된 표사가 해안 방향으로 이송되는 등 왜도 된 연흔모양 매트의 해빈 안정화 효과를 구성하는 주요 기작과 해빈 안정화 효과를 확인할 수 있었다.

• Journal of Forest and Environmental Science
• /
• 제18권1호
• /
• pp.31-44
• /
• 2001

우리나라 해안림(海岸林)의 다면적(多面的) 기능(機能)과 시대적(時代的) 가치관(價値觀)의 변화를 파악하고, 해안사방(海岸砂防)의 참고자료를 얻기 위해 일본의 해안림과 해안사방에 대한 각종 자료를 수집하고 있다. 따라서 일본(日本) 산형현(山形縣)의 장내해안림(庄內海岸林)을 중심으로 분석, 정리하였으며, 주요내용은 장내해안림(庄內海岸林)의 환경특성(環境特性), 연혁과 현황, 문제점, 장내지역(庄內地域)의 방풍림대(防風林帶)와 해안사방시설(海岸砂防施設) 등이다.

• Journal of Forest and Environmental Science
• /
• 제20권1호
• /
• pp.69-81
• /
• 2004

우리나라에 있어서 해안림(海岸林)의 다면적(多面的) 기능(機能)과 시대적(時代的) 가치관(價値觀)의 변화를 파악하고, 해안사방(海岸砂防)의 참고자료를 얻기 위해 일본의 해안림(海岸林)과 해안사방(海岸砂防)에 대한 각종 자료를 수집 분석하고 있다. 전보(전권우(全權雨) 등, 2002)에 이어 일본(日本) 충승현(沖繩縣)의 해안방재림(海岸防災林)을 중심으로 해안림(海岸林)의 개요(槪要), 해안보안림(海岸保安林)의 실태(實態)와 각 도서별(島嶼別) 주요 해안사방용(海岸砂防用) 수종(樹種) 및 대표적인 해안보안림(海岸保安林)에 대하여 분석 정리하였다.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2015년도 춘계학술대회
• /
• pp.179-180
• /
• 2015

The variety of organic and inorganic pollutants are introduced to coastal sediment and making highly contaminated due to rapid development of industralization and economic development. Numerous contaminants are release into marine sediment and it significantly affect marine aquatic environment. In the present study stated the optimize the biostimulant ball (BSB) in coastal sedimentand stabilse the heavy metals present in the sediment. The effective variables like BSB size, distance and month variables on Cu stabilization was determined by using Response surface methodology(RSM). The analysis of variance (ANOVA) and coefficient determination (R2) of Cu reduction 0.9610 and maximum stabilisation was obtained in 3cm ball size and 5.5cm distance and 4 month interval time. This result revealed that the BSB in effective for Cu reduction in coastal sediment.

• 한국해안·해양공학회논문집
• /
• 제22권1호
• /
• pp.47-57
• /
• 2010

Woo and Liu (2004)의 확장형 Boussinesq FEM 수치모형에서 한계점으로 지적되었던 수치진동현상과 계산 효율성이 크게 개선되었다. 수치진동을 해결하기 위해 subgrid scale stabilization method를 사용하였고, 계산효율성을 높이기 위해서 Hessian 연산자를 도입하였으며, 유속벡터에 대한 행렬 구성을 하나의 행렬로 구성하였다. 또한 추가변수에 대한 행렬은 mass lumping technique을 사용하여 대각행렬로 구성하였다. Vincent and Briggs(1989)의 파랑 굴절 및 회절에 대한 수치실험 결과 수치진동현상이 확연히 줄어 들은 것을 관찰할 수 있었으며, 수리실험 결과와도 상당히 일치하는 결과를 보였다. 이전 모형에 비해 약 10배의 계산소요시간이 줄어 향후 항만부진동이나 퇴적물 이동과 같은 현실적인 문제에 적용이 가능할 것으로 기대된다.

• 수산해양교육연구
• /
• 제23권3호
• /
• pp.515-525
• /
• 2011

Due to changes in internal and external environment of coastal & offshore fishery such as decrease in coastal & offshore fishery resources, rising labor costs, rising gas prices, rising turnover rate of seamen, and intensified avoiding 4D types of business, the domestic seamen's avoidance of going to sea is being intensified. In order to solve the problems of domestic seamen shortage, coastal & offshore fishery businesses prefer to employ foreign seamen whose wages are relatively low, so employment of foreign seamen continues to increase. However, the foreign seamen system has the problems in selecting and managing seamen but these problems have been not adequately dealt with, so damages to fishery business continue to occur due to the seamen's deserting. The cases, in which foreigners who entered the country to take the sea in coastal & offshore fishing boats deserted their workplace, recorded 36.4% as of 2010. So in order to achieve the purpose of the foreign seamen system itself through rational management of foreign seamen, the exclusive organization to manage foreign seamen should be established and the system to rationally select foreign seamen who have experiences of fishery should be established. The utilization of foreign seamen during off season needs to be maximized by establishing the employment connection system for the management of foreign seamen and employment stabilization, and the exclusive organization for education of foreign seamen and the organization for nurturing domestic seamen need to be established and operated.