淺水灣 水質變動에 關한 硏究 : After Reclamation of Sosam A and B area 瑞山 A,B地區 干拓 工事以後 = A Study on the Annual Changes of Water Quality in Chonsu Bay

국문 초록 (Abstract)

瑞山 A, B地區 干拓工事以後 淺水灣水質變動에 關한 結果를 要約하면 다음과 같다.
水溫은 冬節期에 2.0℃의 高溫相을, 夏節期는 1.1℃의 低溫相을 나타내었다.
分은 23.55∼33.05‰ 範圍로 8月에 가장 큰 變化르 보였다.
浮遊物質은 9.47∼35.52mg/ㅣ로서 Ⅱ 級水質基準値를 超過하고 있다. 燐酸 의 季節別平均値는 0.26∼0.41㎍-at/ㅣ로서 2月이 가장 높았고 N/P ratio는 13.47∼19.96이었다.
溶存性 無機窒素(DIN)는 4.54∼6.27㎍-at/ㅣ로 2月이 가장 높았다. DIN에 對한 ammonia 比率은 81.5∼90.5%를 보였다.
아질산 질소(NO₂-N)는 0.24∼0.53㎍-at/ㅣ로 질산성질소농도의 60.5∼177.7%를 占하고 있어 脫窒化 科程이 活潑한 것으로 立證하였다.
질산성질소(N)₃-N)는 0.20∼0.38㎍-at/ㅣ로 DIN중 3.59∼11.62%를 보이고 있다.
淺水灣의 汚染度指數는 干拓工事直後인 85年度에 2.75로 最高를 보이다가 86年度부터는 0.13∼0.19를 보이고 있다.
全般的으로 볼 때 淺水灣의 水質은 점차 貧營養化되는 傾向을 보이고 있다. 그러나 排水閘門의 操作으로 因하여 一時에 汚染된 淡水가 流入되어 水産被害가 發生하는 것으로 推定된다.

다국어 초록 (Multilingual Abstract)

In order to study on the change of water quality after the land reclamation of Sosan A and B district in Chonsu Bay, the physical and chemical paramenters were investigated from February 1985 to November 1990.
The average water temperature increased about 2℃ in winter while decreased 1.1℃ in summer. The concentration of salinity ranged from 23.53 to 33.08%, showing the high value in summer.
The concentration of suspended soild ranged from 29.47 to 35.50mg/l, exceeding the Ⅱ grade standard of sea water quality.
The average concentration of orthophosphate showed the range of 0.26∼0.41 ㎍-at/l and the highest level was Febraury and the N/P ratio was a range of 13.47∼19.96. The concentration of dissolved inorganic nitrogen(DIN) was a range of 4.54∼6.27㎍-at/l and showed the highest level in Febraury.
The rate of ammonia to DIN ranged from 81.5 to 90.5%, showing higher level than that of Inchon coastal water.
The concentration of nitrite was a range of 0.24∼0.35 ㎍-at/l and the rate of nitrite ot nitrate ranged from 60.5∼177.7%, showing the active denitrification made progressing.
The concentration of nitrate was a range of 0.20∼0.38㎍-at/l and the rate of nitrate to DIN ranged from 3.59∼11.6%.
The index of pollution in chonsu Bay appeared the high level as 2.74 during the land reclamation but decreased to the range of 0.13∼0.19 after 1986.
As the results, the water quality in chonsu Bay is getting oligotrophic but fisheries demage could be occurred by heavy polluted fresh water form A, B districts when controlling the water gate during the agricultural opening season and heavy rainfall season.