Deterioration And Forming Mechanisms Of Groundwater Quality In Human Activity Areas Of Hutuo River Plain

This paper,based on the research data from the groundwaterpollution evaluation of the 1:250,000 area in Hutuo River alluvial-pluvial plain,aims to unveil the deterioration mechanisms of groundwaterquality in areas of intensive human activities and to explore solutions to controlling local water quality.With analysis of human activities intensity,principal component analysis of feature components,hydrochemical evolution analysis of “two horizontal and two vertical”section and water qualitydeterioration analysis of classical zones,this paper discusses deterioration and forming mechanisms of groundwaterquality.Findings are as follows:Through the evaluation of 367 sets of groundwater samples in fuzzy mathematics,it is found that,in Hutuo River alluvial-pluvial plain,the shallow groundwaterquality is,in general,better in the east and north,and worse in the west and south.Identification and quantitativeevaluation of human activities intensity show that,in the study area,the intensity of human activities has been on the rise phase by phase for many years.The human activities intensity in “one city and three counties”–Shijiazhuang,Luancheng,Gaocheng and Zhengding,make up 48.6% of the area's total;and the number of inferior class-? water samples per area unit in this part is3.78 times the number of the whole.This indicates that there is a correlation between poor water quality and the intensity of human activities.The principal component analysis of spatially rotated factor load of 15 feature component sets shows that the main factors controlling the deterioration of groundwater quality are the double effect of water-rock interaction and pollutants infiltration under human activities,and nitration effect.Analysis of multi-year data indicates that the macro components of groundwater have been on a gradual rise and that nitrate has registered the highest growth rate,351.3% in the past nearly 3 decades.This study employs SIAR source analysis model to look into the contributions of various pollutants to nitrate in the groundwater in classical areas and finds that the contribution of wastewater and manure is as high as 65%.In the “one city and three counties”,by comparing the “two horizontal and two vertical” sections,it's found that historical monitoring data of concentration have not changed dramatically,and that the current monitoring data fluctuate and demonstrate distinct impacts from human activities in recent years.The intensive groundwater exploitation zone in Shijiazhuang,intensive farming zone in Gaocheng and urban wastewaterirrigation zone in Jiaohe have significant impacts on the deterioration of groundwaterquality.The number of inferior class-? water samples per area unit in these areas is 11.3 times the number of the whole.With dissolution,leaching and sedimentation,the “closed” area in the intensive groundwater exploitation zone in Shijiazhuang demonstrates significant water-rock interaction;the groundwater depth is positively related with the dissolvent solid,hardness,chloride and sulfate in featurecomponents.The high intensity of fertilization in intensive farming area has driven the deterioration of groundwaterquality;the massive use of plastic films has resulted in the abnormal level of phthalate in groundwater.Wastewaterirrigation zone in Jiaohe has become the groundwaterdeterioration belt parallel to the river way;the heavy metal components in the soil spread horizontally for around 200 m.An effective solution to groundwaterqualitydeterioration would be prevention and control combined-“cut the sources,and take prevention as a priority and treatment as a supplement”.This study is of great realistic significance to rationally using groundwater resources and effectively preventing and controllinggroundwaterqualitydeterioration in this region.