On Secular Change in Inflows to Lake Biwa

Abstract

The purpose of this paper is to study the secular change and a possibility of the prediction of inflows into Lake Biwa and to disclose the climatic factors affecting on the annual loss of water, which is one of the causes of the secular change of inflows. The results obtained are the followings: (1) On the secular change in annual and summer inflows, the periodicity of about 60 years is discerned by the correlogram analysis. (2) The prediction of annual inflow, based upon a linear combination of the past data, is little significant in practice from the view-point of the predictive error. (3) Sun-shine is one of the dominant climatic factors affecting on the total loss of water resulting from the evaporation, the transpiration and so on.