Analysis of spatial and temporal variations of groundwater level and its salinity in Hetao Irrigation District

Based on Hetao Irrigation District, Inner Mongolia and statistical methods, ordinary Kriging method, ArcGIS9.0 and GS+ etc, the temporal and spatial variability of the groundwater level and groundwater salinity were analyzed at three different irrigation seasons in 2003. The average groundwater level was 2.5 m and the mineralization degree M<4 000 mg/L in the major part of irrigation district, while the average groundwater level was 1.0 m and the mineralization degree M>5 000 mg/L in the major part of irrigation district in November. The groundwater level was gradually falling from southwest to east and increasing from south to north. The groundwater mineralization distribution was higher in west and east area than that in middle area in Hetao Irrigation District. The linear relationship between groundwater level and its salinity is not very significant, but the distribution characters of groundwater level could reflected the distribution characters of the groundwater salinity in the certain regions, namely the shallower the groundwater level was, the higher the salinity degree of groundwater will be.