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K. Mori
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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A MODEL FOR SIMULATING WATER QUALITY IN A RIVER AND APPLICATION OF GENETIC ALGORITHM IN THE MODEL CALIBRATION N. V. Tuan; K. Mori; Y. Hirai
Lowland Technology International Vol 10 No 1, June (2008)
Publisher : International Association of Lowland Technology

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Abstract

This study focuses on finding the properties of water quality parameters affected by different sources of pollutants along the Tatara River, a small river in Fukuoka city of Japan. Results getting from data analysis pointed out interesting and noticeable properties of water quality in the Tatara River, which is significantly affected by various point sources. The results also indicated the changing tendencies of water temperature and dissolved oxygen in the Tatara River in response to different meteorological conditions over a daily cycle. On the other hand, we developed and applied a numerical model to simulate the variation of water quality concentrations in the river. By calibrating the model with water quality data collected from the selected river blocks, the simulated results of dissolved oxygen and water temperature have good agreement with the observed data. In calibrating model, we used genetic algorithms that allowed users to find the best data set of parameters which could not be measured from field measurement and experiments or analyzed simply by a user. Results of the water quality model are helpful for management, protection, and improvement of the Tatara River water quality.
CHARACTERISTICS OF WATER QUALITY IN LAKE SHIKINAWA OF FUKUOKA, JAPAN N. V. Tuan; K. Mori; Y. Hirai
Lowland Technology International Vol 10 No 2, Dec (2008)
Publisher : International Association of Lowland Technology

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Water quality is one of the main characteristics of water storage reservoirs or lakes. A water quality profile, in both of spatial and temporal variations, plays a very important role in assessment and management of lake water quality. In order to understand the lake water quality parameters, some observation plans were carried out for Lake Shikinawa, in different climate conditions including summer, typhoon occurring time, end of autumn, and before spring. Results of the first observation, which were done in summer, are presented and discussed in this paper. Some important properties of water quality situation of Lake Shikinawa were obtained and analyzed. Measured data also gave a clear understanding of the relationship among water quality parameters, effects of climate condition and aquatic plant coverage on lake water quality distribution. Besides, periods predominated by activities of convection term and wind induction on water quality were cleared from analyzed data.
Co-Authors N. V. Tuan Y. Hirai