抄録
This paper examines the relationship between the water quality ((PO4)3-, T-N, Chlorophyll a, and Trihalomethane) and Sunlight UV-rays volume in the reservoir for a fixed period on the assumption that UV-rays volume has a great influence on Chlorophyll a, that is, Trihalomethane. The contents are as follows:(1) The relationship between UV-rays volume and the water qualities in 1997 seems to be almost the same as that of the past two years.(2) The measured UV-rays volume in 1997 is relatively less than that of the past two years. This is supposed to be caused by both a great deal of rain and the temperature in an average year.(3) The seasonal change of UV-rays volume in 1997 appeared only in the surface layer (10cm in depth) in the reservoir.(4) Since the values ((PO4) 3-, T-N, and Chlorophyll a) correlating with the UV-rays volume in 1997 are also very small, the expected relationships (Chlorophyll a vs. Trihalomethane and UV-rays volume vs. Trihalomethane) we planned at first were not available.
