| Title |
Water quality modeling in the Nakdong river (1) - A study on the characteristics of nutrients distribution - |
| Authors |
송교욱 ; 박혜영 ; 박청길 ( Kyo Ook Song ; Hae Young Park ; Chung Kil Park ) |
| Abstract |
The water quality criteria of the Nakdong river is over third grade and trophic state in the area indicate over eutrophic state. Thus this study was conducted to analyze the distribution characteristics of algae and nutrients, and then to explore the interrelationships among them focusing upon the eutrophication in the Nakdong river. The intensive surveys which cover a 163.5㎞ section of the river from Waekwan downstream to Mulgum were conducted during May, June and August, 1991. The results of this study were as follows; 1. Nutrients and Chl.a concentration were estimated 0.04-4.88㎎/ℓ in ammonia nitrogen, 0.002 0.10㎎/ℓ in phosphate and 13.80-126.01㎎/㎥ in Chl.a during the same period. 2. From the Kumho river ammonia nitrogen and phosphate were inputted 40-70 times and 100-500 times higher than main river, respectively. In the waste loads, the Kumho river was the main source of the ammonia nitrogen and phosphate loads and estimated as 90% or more. 3. At Koryong the concentration of ammonia nitrogen and phosphate extended to maximum peak and as downstream flow their concentration was declined, while the concentration of Chl.a was increased. Maximum Chl. a concentration in this period was observed in June, and trophic state was eutrophic with the range of 36.19-126.01㎎/㎥. The revised Carlson`s trophic state index was 53.24-85.01. 4. Maximum specific growth rate(μ_(max)) was 1.07-3.14/day, and half-saturation constants of ammonia nitrogen and phosphate were 0.07-0.41, 0.03-0.12㎎/ℓ, respectively. |