• 한국환경과학회지
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• 제17권3호
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• pp.269-273
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• 2008

The objective of this study was to evaluate the relationship between nutrients and phytoplankton. This study was done by the comparison to two costal areas Mokpo, which inflow fresh water, and Wando. In August, salinity of the sea water decreased by 3.5-4.5%o in Mokpo coastal area, but was not nearly decreased in Wando coastal area. This suggests a lot of fresh water inflow in Mokpo coastal area. DIN and DIP were decreased by water temperature increasing in Wando. However, in Mokpo, DIN and DIP were increased greatly during the summer season. Nitrogen was limited to a 10 NIP ratio especially during the summer season in Wando coastal area while phosphorus in Mokpo coastal area was limited with over 28 N/P ratio in all the seasons. Coefficient of determination$(r^2)$ between DIP and Chl.-a was 0.91 in Mokpo coastal area. On the other hand, Coefficient of determination$(r^2)$ between Chl.-a and DIN, DIP were 0.93 and 0.89, respectively, in Wando coastal area. These results suggest DIP in Mokpo and DIN and DIP in Wando might be limited at the increase of phytoplankton.

• 한국습지학회지
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• 제3권2호
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• pp.107-118
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• 2001

The aim of this paper is to grasp eutrophication aspects in Namhae coastal seas, statistically analyzing existing data for their surface seawater and bottom mud. A pollution level(ignition loess) of bottom mud, on the whole, trended to increase as moving the coastal sea around Mokpo-Wando toward the east(Gyeongnam Namhae coastal seas). Especially, the pollution level(ignition loss=10.5%) of bottom mud for the coastal sea around Tongyeong-Keoje-Gosung was similar to that(10.3%) for the coastal sea around Masan-Jinhae, whose coastal marine pollution was the severest in Namhae coastal seas. It indicates that large amounts of pollutant from aqualculture facilities have been, thus far, accumulated on the coastal sea around Tongyeong-Keoje-Gosung, considering there was no significant inflow of sewage and industrial wastewater into this coastal sea. A COD, T-N, and T-P level of surface seawater, on the whole trended to increase as moving the coastal sea around Mokpo-Wando toward the east(Gyeongnam Namhae coastal seas). A COD level appeared to be the second grade of coastal water quality over the entire year throughout all Namhae coastal seas A T-N level exceeded the third grade of coastal water quality throughout all Namhae coastal seas except the coastal sea around Mokpo-Wando. Especially, a T-N level exceeded as many as three and six times over the third grade of coastal water quality in the coastal sea around Tongyeong-Keoje-Gosung and Masan-Jinhae, respectively. A T-P level appeared to be the second grade of coastal water quality in the coastal sea around Mokpo-Wando and the third grade of coastal water quality in the coastal sea around Yosu-Narnhae and Tongyeong-Keoje-Gosung, while it exceeded as many as two times over the third grade of coastal water quality. A degree of eutrophication of the surface seawater was 1.5 in the coastal sea around Mokpo-Wando and 11.9 In the coastal sea around Tongyeong-Keoje-Gosung, gradually increasing as moving toward the east(Gyeongnam Narnhae coastal seas). It sharply increased to 146.1 in the coastal sea around Masan-Jinhae. Because the degree of eutrophication throughout all Namhae coastal seas exceeded 1, a red tide organism could pose a possibility of proliferation at any place of Namhae coastal seas if other requirements were satisfied. It indicates that a red tide may move to another place once a red tide breaks out at a place of Namhae coastal seas.

• 한국환경과학회지
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• 제15권7호
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• pp.623-634
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• 2006

In this study, characteristics of fog at Mokpo as the west coastal area of Jeonnam were investigated, using statistical analysis of observed fog and meteorological data. Higher frequency of the fog occurrence at Mokpo was showed in spring(32%) and summer(34%) due to the seasonal high atmospheric pressure. Regional characteristics as radiation cooling, advection of fog and water vapor from surrounding sea and Yeongsan lake, and frontal fog had major effect on the coastal fog at Mokpo on the meteorological conditions of north-west/south wind and calm($0{\sim}2m/s$). Also, as the results of analyzing data of before and after the construction of Yeongsan dam, the frequency of annual mean fog days increased 41 %, specially increased 178% in autumn. The increase of fog days mainly resulted from evaporation during colder seasons and from temperature inversion during warmer seasons over the water surface of Yeongsan lake. The construction of Yeongsan dam had a little effect on the meteorological conditions concerning fog occurrence, because Yeongsan dam which only supplies the water for use do not always carry out outlet of the cold water. In addition, the sea fog at Heuksando located in offshore had not effect on the occurrence of fog at Mokpo.

• 한국해안해양공학회지
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• 제18권4호
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• pp.348-359
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• 2006

목포시는 낮은 도시기반시설, 하구언 및 방조제 건설에 따른 해양환경 변화 및 지구온난화에 의한 해수면 상승 등에 기인하여 태풍과 같은 악기상 조건을 수반하지 않더라도 해수범람에 의한 저지대 침수피해가 발생하고 있다. 이에 본 연구에서는 MIKE21 모형을 이용하여 해일/범람 모형을 수립하고, 목포지역에 침수피해를 발생시킨 태풍에 대해 적용하였다. 모의는 최근 10년간 내습한 태풍 중 가장 높은 해일고(59 cm)를 발생시킨 태풍 'RUSA(0215)'가 약최고고조위의 조위상황에 내습할 경우 발생할 수 있는 가상상황에 대해 수행되었다. 이때의 조위는 545cm로 금호방조제 건설이후 목포항 10년 빈도의 고극조위(544 cm)에 해당하는 조위이다. 해일/범람모의 결과, 범람이 발생할 경우 내항부근에서 단시간에 넓은 지역의 피해가 예상되고 있어, 이에 대한 방재대책 마련이 요구된다.

• 한국항만학회지
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• 제11권1호
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• pp.113-120
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• 1997

Tidal changes in Mokpo harbor and its adjacent coastal waters caused by the coastal development including the construction of the Youngsan, Youngam, and Gumho Estuary Barrages had been predicted previously. Since then, the construction work for these estuary barrages had been completed and it was available to get water level variations from the continuous measurement at the Mokpo tidal station. This study deals with the analysis of water level variation from the observed data by the harmonic analysis and mathematical treatment. Some comparisons between the observed water level changes and the predicted by the numerical model are made, which was not supported before. The result shows that the trend of the water level changes are following well the previously predicted variations.

• 한국항해학회지
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• 제15권2호
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• pp.87-96
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• 1991

The change of water level at Mokpo Harbour and its adjacent coastal area due to the construction of the Youngsan Estuary Barrage and the Third Land Reclamation Work of estuary barren had been roughly expected. Periodical floods, which occur 2 times per month, are also being observed at the low lying commercial areas near the Mokpo Old Harbor. Although it is said that the highest tidal current component among the tidal current records at the approaching channel to Mokpo Harbor is reduced to 6 kts, because of the esturary barrage, they do not give any precise statement or a deep analysis for the flooding and periodical water level change under certain environmental conditions. Moreover, they never tried the analysis of development plan considering the natural disaster such as typhoon or other extreme conditions. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality , etc. because of the development considering the extreme condition. Thus, it is necessary to collect and analyze the data related to floodings, harbor oscillations, currents, and water quality, etc. because of the development considering the extreme condition and to evaluate the field observation and measurement, including the numerical model simulation based on the scientific approaches. This study deals the problem of the water level change among the integrated analyses of the coastal area changes. The result can be used for the integrated planning to give a strong foundation and it will contribute to the development of local area.

• 한국해안·해양공학회논문집
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• 제23권1호
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• pp.93-100
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• 2011

박 등(2010)의 연구에서 적용성이 입증된 조석-해일 결합모형을 이용해 목포시에서 범람모의를 수행하였다. MIKE21 모형을 결합모형으로 활용하였으며, 적용영역은 박 등(2010)의 연구와 동일하게 선정하였고 범람모의를 위해 목포시에 대한 정밀역을 추가하였다. 하절기의 대조기 고조시에 맞춰 가상태풍이 목포해역에 직접적인 영향을 주는 경우에 대하여 해석하였으며, 이 경우 발생된 고조위 556 cm는 100년 빈도 정도로 평가된다. 계산된 최대 범람영역을 살펴보면 목포시 내항 및 북항 인근에서 50~100cm 가량 침수되는 것으로 나타나고 있으며, 이를 토대로 내항에서 해안침수예상도를 작성하였다.

• 한국해안·해양공학회논문집
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• 제21권3호
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• pp.230-240
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• 2009

선행연구에서 개발된 ESCORT 모형을 사용하여 영산강하구언 배수갑문을 통한 담수방류의 영향성을 분석하였다. 낙조우세를 감안한 해수유동 모의를 통해 2차원 뿐 아니라 3차원 흐름해석에 있어서도 모형의 적용성과 타당성을 입증하였다. 방류가 흐름양상에 미치는 영향성을 분석하였으며, 담수방류 모의 결과 확산현상은 3차원 모형으로 해석해야 함을 확인할 수 있었다. 또한, 방류구 인근에서 염도의 연직분포 특성을 규명하였고 목포해역 담수확산 범위를 추정하였다. 그 결과 외해수와의 해수교환이 원활치 않음에 기인하여, 목포해역에서는 담수농도의 희석이 매우 느리게 진행되고 있음을 확인할 수 있었다.

• 한국항해학회지
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• 제16권1호
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• pp.37-64
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• 1992

A study on the changes of the oceanographical environment caused by Mokpo coastal zone development was carried out. Special emphasis was placed on the clarification of the water level changes and coastal current structure and influence of the environmental factors on the coastal area. In order to understand the structure oceangraphical environemnt, such as water temperature, salinity, suspended solids, pH, dissolved oxygen, chemical oxygen demand, biochemical oxygen demand, distribution of bottom sediment, tide and current were measured. To investigated the structure of tide and current for the future development, a numerical analysis was carried out. In certain zones, it was found to be flooding problems near the lowlying commercial area.

• 생태와환경
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• 제42권4호
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• pp.432-440
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• 2009

During the period of past fifteen years (1992~2006), variations of chlorophyll a in relation with water quality in freshwater reservoirs were investigated. This study compared total nitrogen (TN), total phosphorus (TP), chlorophyll a, Secchi depth (SD) and total suspended solids (TSS) between terrestrial freshwater reservoir and coastal freshwater reservoir systems based on their location. Regression analyses (linear and non-linear regressions) were applied for all study sites to examine relationship and interaction of these factors in the freshwater systems from in-land to coasts. The results demonstrated that chlorophyll a was significantly correlated to total phosphorus ($R^2=0.94$, P<0.0001) and was remarkably related to TSS increase ($R^2=0.63$, P<0.0001) in the selected reservoirs. The TN : TP ratio in the reservoir systems was higher than Redfield ratio (16 : 1) indicating that the reservoirs are potentially experiencing P limitation. Water quality of coastal freshwater reservoir system was more significantly decreased than the reservoirs located in in-land during the past fifteen years. The strict management of nutrient discharge into freshwater systems should implemented in the coastal reservoirs since the freshwater is introduced into coastal estuarine systems.