Research on Distribution Characteristics on Groundwater Total Dissolved Solids Based on GIS

The condition of the groundwater quality is serious in Northwest Shandong.3S technology is used to emplace sampling points,two field surveys were carried out in 2011.Based on the groundwater TDS data of laboratory experiments as well as the data of 1972,inverse distance weighted spatial interpolation processing used ArcGIS.The results show that: spatial variability tendency of the groundwater TDS is evidently in the study area,the data from the southeast region of 2 g/L gradually increase to the northwest region of 4~5 g/L.Seasonal changes during the year significantly,the mean in spring is 2.628 g/L.In winter,it is 1.748 g/L.Groundwater TDS shows a downward trend compared to 1972,the average decline is 1.52 g/L.The results are of great significance to water salinity control and rationally exploit groundwater resources in the research area.