Abstract
To complete comprehensive model for water quality analysis is generally difficult.The model should be made by purpose, limiting the range of its adaptation.
In this paper, practical method of water quality diagnosis in Kibagata-Lake was discussed.Improvement of water quality by pouring clear water was under planning there.
The two models which were called mass balance model and pollutant diffusion model in this paper, and which had separate purpose, were prepared to diagnosis effect of the project.The former model treated Kibagata?Lake as one pond, and calculated required discharge of clear water to satisfy water quality standard for paddy fields.The reaching rate and removal rate coefficient were determined based on observed date.In the latter model, Kibagata?Lake was divided by 50m interval to simulate plane flow and diffusion.Using this model, distribution of water quality according to location of pouring clear water were compared.
This paper focused on whole procedure of analysis.By combining results of two analysis, the improvement planning of water quality could be diagnosed with enough accuracy on practical use.
