CHAPTER ONE
INTRODUCTION
1.1 Study Background
Within the geophysical research, its an important topic to accurately measure the soil water content. The variation of soil water content has significant influences on the strength and deformation characteristics of the soil, consequently to affect the stabilization of the surface constructions, subsistence and ground water flow.
Today, some common used method to determine or measure soil water content include oven drying method, Neutron instrument, r-ray, time domain Reflectometers (TDR), which all have their draw backs. For instance, all this method require physical installations in the soil and are not suitable for distributed or remote sensing measurement. Therefore, it is a hot issue to find out efficient and easy conducting methods to investigate the soil water content.