A numerical model has developed to simulate water quality and algal species composition in a lake. As artificial destratification is widely used in the lakes, a bubble plume model has incorporated with the ecological model to simulate the dynamic responses of individual species under artificial mixing. Ecological model predicts concentrations of phosphate-phosphorus, ammonia nitrogen, nitrate nitrogen, dissolved oxygen and pH, which may have significant effect on the growth of certain species. Model was validated using data of U Lake (Japan).

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It is important to estimate dam design flow for dam construction. In Japan, design flow must be selected from different three approaches, probable flood in 200 years, observed maximum flow and maximum flow estimated for the subject area. But these approaches are mainly based on the observed data. In case of an extremely heavy rain, the inflow may be beyond the maximum observed value. So in this paper, based on observed precipitation data, probable maximum precipitation are calculated from maximum precipitation with specific humidity. and compared with probable precipitation in 200 years.

In order to carry out effective countermeasures for water quality in dam-reservoirs, it is necessary to observe water quality in detail. MSS on aircraft is useful for observation of horizontal distribution of water quality. The observation by MSS which has 12 bands was carried out for 3 dam-reservoirs and the distributions of water temperature, SS and chlorophyll-a were analyzed by the relationship between CCT count of specific bands and ground truth data for each item. As one of the results, a sinking point of inflow which has high density was identified clearly.