SALINIZATION OF ARTESIAN WELL IN THE EDGE OF THE KUROBE RIVER ALLUVIAL FAN

Abstract

 The purpose of this study is to clarify actual state and mechanism of saltwater intrusion of artesian well in the edge of the Kurobe River alluvial fan. The long term and continuous water quality observation has been carried out for “Sho-zu of Shimizu-an” which is one of most popular springs located in Ikuji district, Kurobe city. As a result of observation, the saltwater intrusion of the artesian well has been progressing drastically for the last 10 years. Maximum chloride ion concentration was 157 mg/L observed in August 2013, if saltwater intrusion will progress it will be too difficult to drink. The tide level of Toyama bay had an uptrend with statistically significant and the seasonal change in EC agreed very well with the tide level of Toyama bay. The causes of the saltwater intrusion of artesian well were decreasing of groundwater level through the whole are of the Kurobe River alluvial fan and increasing of the tide level of Toyama bay.