Analysis on Groundwater Dynamic Characteristics and Causes in Yao Ba Oasis

According to the monitoring data from 1984 to 2014 of the groundwater table in Yao Ba oasis, Alax League, Inner Mongolia of China, analysis the annual and interannual variation of the groundwater table and its genesis in the irrigation area. In addition, use the Surfer11 to draw the water-table contour and restore the cone of depression. Analytical results show that the dynamic type in the irrigation area is artificial exploitation type. Groundwater exploitation is a major factor causing the groundwater table dynamic change, the groundwater table characteristics and the cone of depression mainly depend on the size of exploitation.