This study was conducted for the understanding of zooplankton community structure and energy flow in Yongsan River estuary through the analysis on the seasonal community structure and the measurements of growth rates of dominant copepod Paracalanus parvus s. l.. Field survey was carried out at 7 stations near Yongsan River estuary in May, July, September, and November 2008. Meso-zooplankton communities were composed of 22 taxa in this study period. The spatial variations of species compositions showed a relatively identical distribution regardless of season. This distribution pattern was resulted from the weak effects of the spatial salinity variations that is known to be an important factor for the determination of spatial zooplankton distribution in estuary. The zooplankton communities in this study waters could be generally characterized by the typical coastal-estuarine community structure that was comprised with a few dominant species and abundant density. The mass occurrence of Noctiluca scintillans in May suggested that the environmental situation was unstable due to the geological features and active anthropogenic impacts in Yongsan River estuary. The seasonal average growth rates of dominant copepod Paracalanus parvus s. l. showed a narrow range from 0.12 to 0.15 day−1. However, The spatial variations of growth rates showed that the growth rates near Yongsan River estuary barrage were continuously higher than those at outer stations throughout the year. This results suggested that the growth of copepod was a food-dependent in Yongsan River estuary.

최근 기후변화의 영향으로 우리나라에서 과거 100년간(1906-2005)년동안 평균기온은 0.74℃ 상승하였고, 우리나라의 평균기온은 약 1.5℃ 상승하였다. 또한 강수량의 경우 전 지구적으로 약 2.3% ~ 3.6%가 증가하였다. 기후변화로 인한 기온 상승으로 인한 증발산량의 증가에 따른 유역내 물 부족 현상이 예상된다. 본 연구에서는 SLURP 준 분포형 수문모형을 이용하여 기후변화가 영산강유역의 물 순환 구조에 미치는 영향을 분석하고자 한다. 영산강유역은 총 유역면적 3,469.58으로 서울시의 약 5.7배 이고, 총 하천길이는 4,991.25, 평균 경사는 20.91%, 평균 표고는 111.15이다. 또한 영산강유역에는 4개의 농업용저수지(광주댐, 나주댐, 담양댐, 장성댐)가 설치되어있다. 본 논문에서는 영산강유역의 농업용 저수지를 고려하여 영산강유역의 나주관측소를 대상으로 4개년(2000년∼2003년) 동안의 일별 유출량 자료를 바탕으로 모형의 보정(2000년∼2003년)과 검증(2004년~2006년)을 하고, 지역기후모형을 이용하여 미래를 3개의 기간(future 1: 2011년∼2040년, future 2 : 2041년∼2070년, future 3 : 2071년∼2100년)으로 나누어 영산강유역에서 기후변화가 물 순환 구조에 미치는 영향을 분석하였다. 또한 유황분석을 통해 미래의 하천의 유황의 변화를 전망하였다. 그 결과 미래로 갈수록 유출량이 증가하리라 전망되었고, Future 2일 때 유출량이 가장 많이 발생하리라 전망되었다. 유황분석 결과 미래로 갈수록 풍수량과 갈수량이 증가하리라 전망되었고, Future2기간일 때 가장 많이 증가하리라 전망되었고, 풍수량과 갈수량의 경향성 분석을 통해 미래로 갈수록 풍수량과 갈수량이 증가하는 것을 확인 할 수 있었다.

It is essential for port planning, coastal zone management and environmental impact study to analyze the variation of current and water quality due to the development of water area and discharged water from estuary barrage and basin etc. Mokpo sea area downstreams from a long river and two large basins, the Yongsan river and Yongam-Kumho basins discharging much of water through water gates for the purpose of flood control and prohibition of salt intrusion to the inland fresh water area. In this study, the numerical calculations were carried out for the analysis of diffusion characteristics due to discharging operation, adapting the results of tidal current simulation ADI methord is applied to the governing equation for the movement of sea water and diffusion and 6-point method to the advection terms of diffusion equation. As the results of this study, it is known that the discharging operation causes increasing and/or decreasing of current velocity and enlarging and/or depressing of pollutant diffusion limits depending on the distance from the discharging gates and the mode of discharging operation. To utilize these result, the linked gate operation and the method increasing exchange of sea water must be considered.

Mokpo coastal area is connected to the adjacent a long river and two large basins. It is essential for port planning coastal zone management and environmental impact study to analyze the data related to the ship operation and variation of current and water quality due to the development of water area including dredging reclamation and estuary barrage. The Yongsan river estuary weir and Yongam-Kumho basins discharge much of water through water gates for the purpose of flood control and prohibit salt intrusion at the inland fresh water area. To meet this purpose discharge through the gates have been done at the period of maximum water level difference between inner river and sea level. This discharged water may cause the changes of current pattern and other environmental influences in the vicinity and inner area of semi-closed Mokpo harbor. In this study ADI method is applied to the governing equation for the analysis of the changes on current pattern due to discharged water. As the results of this study it is known that the discharging operation causes many changes including the increase of current velocity at the front water area at piers approaching passage and anchorages. Discussion made on the point of problems such as restricted maneuverability and the safety of morred vessels at pier and anchorage. To minimize this influence the linked gate operation discharging warning system and laternative mooring system are recommended.