A STUDY ON IMPROVEMENTS FOR A SIMULATION OF DAILY MEAN WATER TEMPERATURE IN A SHALLOW LAKE

Abstract

 In this article, we calculated the daily mean water temperature in a shallow lake by the optimal interpolation which is one of the data assimilation methods. We set three kinds of the weight of optimal interpolation to investigate an accuracy of calculation. As a result, the accuracy became quickly worse within 8 days of interplorating interval. In addition, when the interval of 8 days was longer, it was found that 30 to 50% of results by data assimilation was worse than results of heat budget method because results of both no data assimilation and by data assimilation were almost the same within 8 days.