Study On The Current Situation And Evolution Law Of The Groundwater In Jinghuiqu Irrigation District

Jinghuiqu Irrigation District are locats in the central of the Guanzhong plain. Jinghe river is the water source for this irrigation district. It take charge of Jingyang,Sanyuan,Gao Ling,Yanliang,Lintong countyes farmland irrigation task, 2.4% of the cultivated land of the whole province, produce 5.8% of the grain of the whole province, it is the important grain and agricultural productsproduction base of our province.Have made enormous contribution for us. But nearly more than ten years groundwater mining quantity remarkable increase year by year.Adopt greater than benefit,It not only cause the water table to drop continuously but also causes the change of the chemical component in the groundwater and aggravated water pollution.This thesis is on the basis of investigating,collecting and analyzing the local hydrogeological materials in the field,analyse the chemical composition of water and using the Kriging inserting method in the geographical information system to study the chemical composition of the groundwater in this area. Studies have suggested that solubility total solid (TDS) content,hardness value of the groundwater relatively high and the alkalinity was between 7 and 8.5,which is Jinghuqu irrgation district in April 2008.The groundwater of some areas of Yanliang district and northeast Sanyuan county,the six price chromium ion higher than other area. Some areas of north of Jingyang county and southeast of Gaoling County Fluorine-ion are higher than other area. Utilize evaluation of F value,can obtain that the groundwater in Jinghuiqu Irrigation District, 80.85% is V water(It is unsuitable to drink), 14.89% are IV water(It is suitable to drink if deal with it appropriately), 4.26% are II water(It is suitable to drink). Because F value evaluation stress the serious pollution ion,so the F value maybe slightly high.The analysis on materials of several decades obtains that the groundwater of the west area of the distict are best, the groundwater of the east area of the distict become worse year by year. The reason is the function of dissolve and evaporation concentrate. Through discovering to the correlation coefficient of TDS and the water hardness with every ion. Shows that TDS and the waterhardness with relevant ion have certain correlation, TDS with every ion correlation power order are: SO₄^2- > K⁺+Na⁺ > Cl^- > Mg²⁺ > HCO₃^- > Ca²⁺. The correlation of magnesium ion is stronger than calcium for the hardness.