Measurement of Water Content in Unsaturated Aquifer in the Ashigara Alluvial Fan

Abstract

Most of irrigated water in paddy fields infiltrates underground. This process, however, has not been clarified. In the case that groundwater table is deep, the measurement of water content in unsaturated aquifer has not been reported. We measured water content in unsaturated aquifer in the Ashigara Alluvial Fan using neutron moisture meter. As a result, there was no difference in the water content between in irrigation period and in non-irrigation. It was revealed that the infiltrated water from the paddy fields goes down, not increasing water content in unsaturated aquifer in the Ashigara Alluvial Fan.