Application of Cluster Analysis in hydrochemical composition classifications-case study of middle reaches of Yinma River

Chemical composition of groundwater reflects the historical evolvement of groundwater in an area. The Cluster Analysis method is introduced in this paper with descriptions of the principle for using this method, and introducing the classification process for chemical types of groundwater by using this method. The classification by cluster analysis indicated that the results considered all chemical components of groundwater, which, therefore, is a good effect.