초록 ▼

O 연구목표
- 새만금 해양환경 실천계획에 따른 해양환경보전 대책수립
- 새만금 해양환경 감시를 위한 학제적 감시망 구축 및 운영
- 방조제 끝막이 공사에 의한 해양환경 변화 및 평가
- 배수갑문 유출수에 의한 해양수질환경 변화 모니터링
- 해수유통 시나리오별 해양환경변화 예측/평가
O 주요연구내용
- 새만금 외해역 해양환경 종합감시망 구축
- 해수유통 기간중 만경수역 해양환경 감시
- 주요 해양환경 쟁점사항별 정밀조사 및 과정규명
- 해양환경 변화 예측, 평가
- 해양환경

O 연구목표
- 새만금 해양환경 실천계획에 따른 해양환경보전 대책수립
- 새만금 해양환경 감시를 위한 학제적 감시망 구축 및 운영
- 방조제 끝막이 공사에 의한 해양환경 변화 및 평가
- 배수갑문 유출수에 의한 해양수질환경 변화 모니터링
- 해수유통 시나리오별 해양환경변화 예측/평가
O 주요연구내용
- 새만금 외해역 해양환경 종합감시망 구축
- 해수유통 기간중 만경수역 해양환경 감시
- 주요 해양환경 쟁점사항별 정밀조사 및 과정규명
- 해양환경 변화 예측, 평가
- 해양환경 관리, 이용 및 활용방안 제안
- 정책결정에 필요한 해양과학기술 지원
O 연구성과 (핵심기술 및 성과물)
- 수질모니터링과 상시감시망 운영
- 배수갑문 유출수, 저산소충 등 정밀조사
- 외해역 해저지형 변화 및 저서생물서식환경 조사
- 유출수 이동 확산 및 퇴적물이동 모텔링
- 끝막이 전후 해양환경변화에 대한 1차 평가
(출처 : 보고서 초록 4p)

Abstract ▼

제 2 장 상시감시망 분야
IV. Results
。Installation and operation of the real time monitoring system
· Deployed three data buoys and maintained a tower,
· Maintained a buoys inside the Mangyung dike (35˚ 51.22'N, 126˚ 33 . 05'E)
· Maintained a buoys off the Sinsi gate (35-47.6'N, 126-26.9'E),

제 2 장 상시감시망 분야
IV. Results
。Installation and operation of the real time monitoring system
· Deployed three data buoys and maintained a tower,
· Maintained a buoys inside the Mangyung dike (35˚ 51.22'N, 126˚ 33 . 05'E)
· Maintained a buoys off the Sinsi gate (35-47.6'N, 126-26.9'E),
· Maintained a buoys off the Byunsan Beach area (35˚ 41.21', 126˚ 30.02'),
· Maintained a tower off the Mankyung dyke (35-53.695'N, 126-26.901'),
· Checked the sensors 없ld cleaned bio-organism attached to the sensors.
。Modification of tidal current after the finial closing of open gaps
· Decreased tidal current more than 80 % inside the Mankyung dike and off the Sinsi gate after closing,
· Decreased tidal current about 30-40 % off the Byunsan Beach area,
。Observation of current variation in the entrance area to Kogunsan islands of outflow through the Saemangeum gate
· Northward flow in summer and eastward in winter of low-frequency current in the trough between Sinsi and Munyo islands
。Monitoring of water quality inside of Mankyung dike in sununer
· Monitoring of stratification and dissolved oxygen in the channel of Mankyung area,
· Frequent appearance of low concentrated of dissolved oxygen less than 5 mg/l at 0.5 m above the bottom in summer
· Three times appearance of low concentrated of dissolved oxygen less than 2mg/l in late June, early August and early October
。Manufacture and installation of Saemangeum observation tower
· Installation position of observation tower: Off the Garyuk gate (35˚ 43.2'N, 126˚ 30.9’E)
· Choosing the manufacture and installation company
: Structure of observation tower - Sukjung Co. and Ecocean Co
: Electricity supply - Maxcom Co.
· Go forward with manufacture and installation of Garyuk observation tower

(출처: 제2편 분야별 요약 SUMMARY 85p)

제 3 장 방조제 외해역 해저환경 이용분야
IV. Results
。Topography
· Decrease in the distributional area of surface sands as compared with that of 2005, most likely caused by artificial activities
· Deposition of coarser sediments within the Gogunsan Archipelago during the last one year
· Weakened seasonality of wintertime erosion and summertime deposition on Byunsan Beach with remarkable degradation of the latter resulting in a gradual erosion during the last 3 years as a whole
。Tidal flat ecosystem and shellfish resources
· Macrobenthic communities on the outer tidal flats of the dyke largely changed in their similarity both after dyke connection of sector 4 and after completion of the dyke
· Changes in the structure of macrobenthic community accelerated with respect to increase of organic materials after the completion of the dyke
· Apprehensions of degradation of the macrobenthic community due to the accumulated effects of organic materials and need of their discharged amounts from inside the dyke
· Identification of shellfish resources such as Crassostrea gigas and Ruditapes philippinarum in the tidal flat around the Gogunsan Archipelago
· Low standing crop of shellfishes in the subtidal areas
· Need for investigating population ecology of shellfishes such as Comb pen shell (Atrina pectinata) and japonese cockle (Fulvia mutica)
。 Monitoring of benthic ecosystem
· Mean grain size of the sediments outside the dyke tend to decrease as a results of reduced water movements.
· Chemical oxygen demand (COD) of the sediment reflected the grain size decrease and COD value increased since 2006. The increasing trend continued in 2007, especially outside the dyke.
· The number of species tend to decrease since 2002~4 inside the dyke but the species number increased again in 2005. The trend continued in 2006 and 2007.
· The number of species and mean density in outside the dyke tend to decrease in 2005 compared to 2002~4 and the decreasing trend continued in 2006 and 2007

(출처: 제2편 분야별 요약 SUMMARY 127p)

제 4 장 예측ㆍ평가 모델링 분야
IV. Results
。Marine environmental change after the Saemangeum dike closure
. Tidal and residual currents near the Gunsan outer port increase about 5 % after the 4th dike c10sure
. The change of tidal current near the Gomso bay is negligible.
. The suspended sediment concentration outside of the dike decreased after the dike closure
。Behavior of the sluice gate outflow
. The outf1ow is mixed up in the southern area of the Kogunsan Islands and it is extended southward
. The flushing time increase after the dike closure
。Improvement of the circulation and water quality coupled model
. The bathymetry is improved using digital charts
. The runtime of the model is shortened 40 % in maximum with a parallel method
. Model results are calibrated using long-term sea level observation
。Integrated marine environmental prediction system
. The concept and structure of the system are designed
。 Development and validation of lD sediment diffusion equation using field data
. Field data were obtained at about 15-m depth to validate the lD sediment diffusion equation.
. Field data included waves, currents 없ld suspended sediment concentrations.
. Previous lD model gave more than 2-order of magnitude difference between the observed and modeled supsended sediment concentration.
. Changing sediment grain-size on the bed surface to fine sediment greatly improved the model prediction.
o Development of 3D sediment transport model
. The model domain extended to include Gomso Bay and Geum River Estuary.
. The open boundary condition of tide was taken from that of K-COM model.
. The EFDC was improved to run with coupled, unsteady waves and currents.
. The model resulted in increased suspended sediment concentration and morphologic change under the influence of waves.
o prediction of morphologic change due to sand mining
. A large-scale sandpit was assumed at about 13-m depth in front of the dyke 4 and the effect of sandpit on morphologic change was examined.
. With tide alone, the effect of the sandpit was minima1. The difference of morphologic change withj out the sandpit was nearly zero.
. Under the influence of waves and currents, the difference of morphologic change with/out the sandpit was quite significant.
. Schemes to minimize environmental impacts due to sand mining was examined analytically and numerically.
. Since waves are very important resuspending agent of bottom sediment, sand must be mined at a deeper depth than 50 m where wave effects are almost diminished.

(출처: 제2편 분야별 요약 SUMMARY 167p)

제 5 장 총괄운영 분야
IV. Results
。Saemangeum Coastal Research Center
. Operation of the center and a liaison office in the Saemangeum area
. Planning the annual program and joint measurements between discip1ines
. Management and coordination of the subprojects
. Reports progressive and interim reports, annual reports
。Documentation for evaluation by MOMAF and Prime Ministry
. MOMAF interim and annua1 evaluation of research outputs interim report : 5-6 July 2007, Spa Castle, Deogsan annual evaluation 21 Feb. 2008, Korea lnstitute of Marine Science and Technology Promotion
. Prime Ministry evaluation of the armual plan, interim and annual products
。Special Survey and synthetic summary
. Float experiment for outflow through the sluice gates
. Conduction of surveys in the Archepelagos of Gogunsan Islanlds
. lnternal assessment for oceanographic changes after the final dyke closure
o Ocean Data Management unit
. Data Management data collection, processing and distribution
. Establishrnent of DB based on the Oracle DBMS and data retrieval system
. Operation of the internet web site: www.saemangeum.re.kr

(출처: 제2편 분야별 요약 SUMMARY 201p)