시화호 배수갑문 개방 후의 수질 및 퇴적환경 변화

Abstract

근년, 시화호에서는 수질환경이 악화되어 큰 사회적문제가 되었다. 본 연구에서는 수온, 염분, 용존산소 등의 수질관측과 함께 주상시료를 3개정점에서 채취하여 입도분석, CN 함량 등의 퇴적물분석 및 방사선 강도측정을 실시하였다. 그 결과, 추계에서도 시화호 북측하구와 반월공단 앞에서는 염분 성층에 의한 용존산소 농도의 저하가 하층에서 관찰되었으며, 주상시료 분석을 통해서는 방조제 완공 후의 오염 퇴적층과 공사기간 및 건설전의 퇴적층에 있어서의 퇴적환경 변화의 과정을 명확히 하였다.

In recent years, water environment of the Lake Shihwa has been deteriorating and it has created huge social problems in Korea. In order to identify the reasons for the deterioration, an efficient investigation is required and can recommend the measures to overcome such problems. Based on the field observation and analysis of the collected samples, we will discuss the environment of Lake Shihwa, considering the parameters such as water temperature, salinity and dissolved oxygen (DO). Similarly, core samples from three points in the lake area were collected and the particle distribution, Total Carbon/Nitrogen content(C/lf ratio) and radioactive strength were measured. Even in the autumn, the lower value of DO concentration was observed in the near bottom layer of the north river mouth and in the front area of Ban-Weul which is caused by salinocline. Furthermore, the core sample analysis clearly showed the change of sedimentation process on the time basis such as before, during and after the construction of the water gate. The sediment layer has been a good record of the contamination after the completion of the water gate. In other words, the result of this research enables us to understand the impacts of construction of the water gate, which triggered the pollution of the organic matters in the lake.