Desalination plants have been recently constructed in many parts of the world due to water scarcity caused by population growth, industrialization and climate change. Most seawater desalination plants are designed with a submarine pipeline for intake and discharge. Submarine pipelines are installed directly on the bottom of the water body if the bottom is sandy and flat. Intake is located on a low-energy shoreline with minimal exposure to beach erosion, heavy storms, typhoons, tsunamis, or strong underwater currents. Typically, HDPE (High Density Polyethylene) pipes are used in such a configuration. Submarine pipelines cause many problems when they are not properly designed; HDPE pipelines can be floated or exposed to strong currents and wind or tidal action. This study examines the optimal design method for the trench depth of pipeline, analysis of on-bottom stability and dilution of the concentrate based on the desalination plant conducted at the Pacific coast of Peru, Chilca. As a result of this study, the submarine pipeline should be trenched at least below 1.8 m. The same direction of pipeline with the main wind is a key factor to achieve economic stability. The concentrate should be discharged as much as high position to yield high dilution rate.

1. 서 론
 2. 연구방법
  2.1 해안 침식 및 퇴적 예측
  2.2 해저 배관의 안정성 분석
 3. 결과 및 고찰
  3.1 해수 담수화 설비의 취수 및 배출수 설비 고찰
   3.1.1 취수 설비
   3.1.2 배출수 설비의 고염도 농축수 희석
  3.2 해안침식 및 퇴적 분석 결과를 통한 해저배관 최적 매설깊이 결정
  3.3 해저배관의 안정성 검토
   3.3.1 취수배관의 안정성 검토
   3.3.2 배출수 배관의 안정성 검토
 4. 결 론
 References

• 최광민(서울시립대학교 일반대학원 환경공학과, Department of Environmental Engineering, The Graduate School of the University of Seoul) | Gwangmin Choi
• 한인섭(서울시립대학교 일반대학원 환경공학과, Department of Environmental Engineering, The Graduate School of the University of Seoul) | Inseop Han Corresponding author