GEOCHEMICAL MODELING OF GROUNDWATER IN KARST AREA AND ITS APPLICATIONAT PINGDINGSHAN COALFIELD

Several approaches including hydrogeochemistry and isotope hydrogeolog y have been used to investigate the karst groundwater systems at Pingd ingshan coalfield in recent years. The results of the modeling and eva luation of groundwater chemistry, as parts of recent research progress at the area, are presented. The characteristics of Cambrian karst gro undwater flow was analyzed in terms of tritium distribution of groundw ater based on the fact that the Guodishan fault, the largest one withi n the coalfield, is divided into permeable (southern and northern) and impermeable (middle) sections. The evolution of groundwater chemistry , the suitability of geothermometers and the feature of karst developm ent were deduced and discussed using the speciation modeling and mass balance approach.