Primary results of investigation on dynamics of water quality in the Truc Bach lake - Hanoi

Abstract

Ha Noi owns over 100 lakes which are playing a very important role for creating landscape as well as are the habitant for many aquatic animals. However, as closed water bodies (exchange rate with external waters is negligible), these lakes are facing a wide range of water quality problems due to receiving waste sources which are not controlled properly as well as immanent causes of closed water bodies. Specifically, thermal stratification which is dependent greatly on meteorological conditions has great impact on their water quality. To research and discover this issue, Truc Bach Lake which is located in the North-West of Hanoi’s central was chosen as a typical one to conduct a case study. In the research, water quality variables of Truc Bach Lake during a daily cycle were measured on site and sampled periodically (in four seasons) for analyzing in Laboratory in order to investigate the vertical dynamics of its water quality during a daily cycle as well as the seasonal change within a year. The results of this study provide not only many valuable information on the temporal and spatial changes of the lake’s water quality within a year but also the premise for simulating the water quality dynamics in the targeted lake, which would be conducted in further researches.