• 한국지반신소재학회논문집
• /
• 제21권2호
• /
• pp.1-9
• /
• 2022

최근 환경적 문제로 공유수면 매립사업이 감소추세에 있으나 매립사업의 특성상 일률적인 지표로 환경성을 평가하는 데 한계가 있다. 이 연구에서는 공유수면 매립지의 토질역학적 침하거동 인자를 활용하여 폐석회 매립시설의 침하 안정성을 분석하였다. 1차 압밀특성 인자로부터 폐석회는 압밀이 진행중인 점토특성과 유사함을 확인하였다. 매립지 지층을 얇은 토목섬유 보강재로 보강된 층상구조로 가정하고, Westergaard 방법에 따른 응력증가량을 이용하여 침하량을 예측하였다. 압밀도에 따른 침하량을 예측한 결과 연약지반의 표층이 토목섬유로 보강된 경우 보강되지 않은 경우보다 응력증가량이 40% 감소하는 것으로 나타났다. 또한, 폐석회의 소성지수와 내부마찰각의 상관관계를 이용하여 점토와 폐석회의 압밀거동 특성을 비교하였다. 공유수면 매립지내 폐석회는 압밀이 진행중인 상태이므로 장기적으로 침하는 더 증가하는 경향을 보일 것으로 예측되었다.

• 환경영향평가
• /
• 제19권6호
• /
• pp.563-571
• /
• 2010

In carrying out the prior review on environmental conditions for basic plan of public waters reclamation, the important item is review on conditions of location on prearranged reclaimed land. In this study, environmental assessment which needs careful consideration in the first stage of selecting location is presented by analyzing environmental impact assessment on public waters reclamation projects for about 10 years. The assessment index for alternative comparison is divided into two parts according to importance level. What is most important in alternative comparison is the comparison on direct influence due to reclamation. In other words, it figures out damaged extent of natural shoreline as well as intertidal and infralittoral zones. Comparing influence extent due to reclamation through the 1st comparison on this is regarded as to be important. In case there is no significant difference by alternatives through the 1st assessment, the 2nd assessment should be carried out. In the 2nd assessment indexes are damaged quantity of benthic organism, change in seawater current, erosion, accumulation and exchangeable rate of seawater. The plan for selecting optimal location which minimizes environmental influence in establishing public waters reclamation plan is demonstrated through model cases. For this, 3 districts which have similar environment and scale are selected, and then comparison on location alternative is made through environmental assessment index. In addition, the comparison on 3 arrangement alternatives are conducted, targeting certain areas. It is thought that carrying out comparison review on respective areas in the same cities and counties, not merely comparing arrangement plan by selecting 1 targeting area in advance, is the most appropriate. Besides, selection of arrangement plan considering environment, which minimizes damage of natural shoreline and influence due to change of seawater current is required in alternative comparison on arrangement plan as well. In case of the prior review on environmental conditions though alternative comparison method presented in this study is carried out, it is safely said that the influence on ocean environment due to public waters reclamation can be minimized.

• 한국해안·해양공학회논문집
• /
• 제21권5호
• /
• pp.371-379
• /
• 2009

본 논문은 매립지에서 과거의 해안선을 산정하는 방법과 문제에 대하여 논의하였다. 우리나라 해안토지의 미등록 실태는 공유수면 매립 시 복잡한 토지소유권 분쟁을 초래할 수 있다. 과거의 해안선은 지적경계와 달리 해안선 정의에 대한 제도적 미흡과 더불어 해안선 변화의 특성으로 인하여 다양한 위치의 해안선이 제시될 수 있으며, 이는 해안빈지 및 포락지의 면적 산정에 직접적인 영향을 미친다. 안정국가산업단지에 대한 사례연구를 통하여 이러한 문제를 저감할 수 있는 체계적인 해안선 조사 방법을 제시하였다. 해안선 변화가 없는 암반해안을 대상으로 매립 이전에 촬영된 항공사진을 이용하여 조위에 근거하는 해안선을 산정하였다. 이를 지상 지형 측량 성과와 비교한 결과, 항공사진측량에 의한 해안선의 정확도는 신뢰할 만한 수준이었다.

• 한국환경농학회지
• /
• 제19권5호
• /
• pp.426-432
• /
• 2000

Field experiment was performed from August 1996 to December 1999 to examine the feasibility of constructed wetland system for sewage treatment in rural areas. A pilot system was installed in Konkuk University and the effluent of septic tank for school building was used as an influent to the wetland treatment basin. The system was composed of sand and reed, and operated continuously including winter time. Average removal rate of about 70% was observed for BOD, COD, and SS, about 50% for T-P, and about 25% for T-N. The reason for poor T-N removal might be due to high loading rate and short retention time. The system demonstrated satisfactory effluent concentration and stable performance in growing season. And it also worked adequately in wintertime even below $10^{\circ}C$ without freezing, and removal was still significant. The amount removed in BOD, COD, and SS was almost the same as in the growing season, and the amount removed in nutrients was about half of the one in growing season. Overall performance of the experimental system was compared with existing data base (NADB, 1994), and it was within the range of general system performance. As study period increased, removal rates for BOD, COD, SS, and T-P were consistently maintained and even enhanced, but removal rate for T-N decreased slightly. Wetland system was thought to be a feasible alternative for sewage treatment in rural area considering its low cost and low maintenance requirement. However, the effluent of the experimental wetland system often exceeded current effluent water quality standards, therefore, further treatment could be required if the effluent should be discharged to public waters. Wetland system of interest locates in rural area and is a part of rural ecosystem, therefore, ultimate disposal of reclaimed sewage for agricultural purpose or subsequent land treatment might be available and further research in this matter is recommended.

• 한국지반환경공학회 논문집
• /
• 제25권4호
• /
• pp.5-12
• /
• 2024

간석지(공유수면) 내 단지를 조성하는 경우, 해안 퇴적지반 특성상 대규모 성토재가 필요하고, 단지공사 시 불가피하게 발생되는 연약점성토를 성토재료로 활용하는 것이 자원재활용 및 경제적 측면(소요토량감소)에서 필요한 실정이다. 본 연구에서는 연약점성토의 성토재활용에 따른 절취교란된 점성토의 압밀특성변화를 파악하고, 압밀침하량 설계방안에 대하여 제안하였다. 연구 대상지의 압밀시험결과를 통해 교란(절취)에 따른 압밀특성치 변화(압축지수감소, 선행하중산정불가)를 확인하였고, 점성토 성토층을 복합대상층(압밀대상 및 상재하중층)으로 산정(압밀침하량)하는 방안이 실제거동과 부합한 결과로 분석되었다.