Chemical Characteristics and Controlling Factorsof Groundwater in Chahannur Basin

This paper studies the spatial distribution characteristics and controlling factors of groundwater chemistry in Chahannur Basin. One hundred seventy shallow samples (50 m shallow) are collected, seven ions, pH, TDS, TH, iron, manganese, COD, barium other indicators, detected. Piper triplex graph, Gibbs model, ion ratio, analysis variance Kriging interpolation used to carry out research. The results show that bicarbonate water is main chemical type Basin, which accounts for 65.23%, chloride 15.15% sulfate 19.62%. Bicarbonate mainly distributed mountainous areas north south basin, factor rock weathering. Sulfate-type lower reaches northern mountains weathering evaporation concentration. Lake area buried central region basin. concentration human influence. Na+ derived from atmospheric precipitation salt leaching, Ca2+ Mg2+ carbonate minerals silicate leaching less. pH basin ranges 6.3 9.18, with an average value 7.50. TDS 227 22,700 mg/L, 1661 mg/L. Iron catchment 0.01 15.343 a mean 0.837 manganese content 0.005 3.802 0.254 COD 0.71–32.72 3.49 Barium 0.312 0.075 research provide basic scientific data support hydrochemistry Basin types study complex diverse, although still controlled by terrain geological conditions, affected activities high proportion, so attention should be paid impact on this area.