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Determination of Representative Long-term Water Quality Parameters of the Streams in Estuarine Lake  

Kim, Young-Chul (Department of Environmental Engineering, Hanseo University)
Lee, Dong-Ryul (Department of Environmental Engineering, Hanseo University)
Hwang, Gil-Son (Korea Institute of Construction Technology, Department of Water Resources.Water Environment Research Center)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.3, 2005 , pp. 262-272 More about this Journal
Abstract
This study was undertaken to obtain design concentrations for the natural system treating stream water flowing into estuarine lake(Sapgyo). This lake has three major, so called, national-class streams: one is Gokgyo flowing through two medium-size municipal areas and the others are Muhan and Sapgyo placed in mostly rural area nested with some small towns. The results of three year's investigation showed big changes in water quality during the period between dry and wet seasons. Nitrogen concentration usually decreases as the flow rate increases. The change of phosphorus concentration in Gokgyo was the same pattern as nitrogen, but in other two streams it was inversely related with flow rates. This is probably due to the chemical property of the particles washed out from the different stream basins during wet season. It was found that about 40 to 60% of the total nitrogen are in soluble form and on average, 35% of the total phosphorus consists of dissolved-P. Representative concentration of these streams has to be separately determined based on dry and wet season. TDS and SS could be indicating parameters useful to depict and characterize a change of water quality with respect to flow rate because their measurement is easy and also includes a small analytical error. TDS values measured during dry season are related with high nitrogen concentration while during wet season, SS values effectively reflect a high concentration of phosphorus. For design purpose, cumulative concentration distribution graph presented in this paper can be directly or indirectly applied to other streams through a brief comparative and verificative study.
Keywords
Estuarine Lake; Nitrogen; Phosphorus; Stream;
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