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KMID : 0380119830060020081
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Korean Journal of Ecology
1983 Volume.6 No. 2 p.81 ~ p.89
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Environmental Changes of the Rivers in Taegu Area after a Heavy Rain
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Lyu Seung-Won
Song Seung-Dal
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Abstract
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The changes of environmental factors with flow rates were studied quantitatively for two rivers, the Nakdong River and the Sin stream, which have different basins in ecosystem structures, during short period after a heavy rain. In the Nakdong River, transparency, DO, alkalinity and hardness were negatively correlated with the flow rate by logarithmic function, but the concentration of SiO_2 was relatively constant regardless of the flow change. In the Sin stream, transparency, alkalinity, hardness and the concentration of NH_3-N, NO_2-N and SO_4 = showed negative correlation with the flow rate by logarithmic function. The ratios of maximum to minimum values for aquatic environmental factors during the sampling period were in the ranges of 1∼7 in the Nakdong River and 1∼28 in the Sin stream were 8, 6 and 1 times as high as those in the Nakdong River, respectively, but in the stable flow state, those became 94, 25 and more than 10 times, respectively. The load for most of the dissolved environmental constituents changed similraly to the flow rate in both rivers. It is notable that, at the stable flow state, the loads for NH_3-N(59g/sec) and NO_2-N(3.3g/sec) in the Sin stream were 4.3 and 1.3 times as high as those in the Nakdong River.
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