A data processing system for evaluation of environmental water quality: An application to evaluation of natural and man-made factors affecting water quality variations in rivers
1990
Furuta, M. (Aichi-ken. Environmental Research Center, Nagoya (Japan)) | Iwase, T.
A data processing system for river water quality has been developed and applied to acutual data. The system, consisting of several kinds of personal computers, can search data on river water quality and onhydorological, geological, or sociological parameters in the drainage areas, and can practise statistical analyses, time series analyses or polluatant loading analyses on the data interactively. The system can also show the results graphically. The system was applied to actual data, and the following results were obtained about natural and man-made factors affecting water quality variations in rivers. (1) Cyclic variations were detected in water quality variations of polluted rivers during dry weather in recent 8 years, which covariated with those of monthly precipitation with intervals of about 30 months. (2) In rivers with drainage areas showing considerable population increase in recent years, there exisisted tendencies of increase in the amplitudes of seasonal variations of ammnonium nitrogen and so on, or of transformation of the statistical characteristics of the water quality data. (3) In polluted rivers, the water quality was substantially improved during both the Bon festival and new year's holidays compared with those during the period before and after. Cyclic variations and changes in statistical nature of the data should be taken into account when trend components with interval of 12 months are evaluated in river water quality. The deviations of water quality during the holiday periods from those during the working days, can be used as indexes of contributions of domestic, industrial and natural loadings to total amount of pollutant loadings in the rivers.
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