Nitrogen Contents and Variation Rules of Shallow Groundwater in Chengdu Area
|School||Chengdu University of Technology|
|Keywords||Groundwater Three nitrogen pollution Nitrate pollution Cluster analysis Chengdu|
Groundwater is an important resource , once contaminated , it will be difficult to update and restore . Chengdu region located in the eastern part of the Chengdu Plain , with shallow groundwater close contact force of surface water vulnerability to pollution characteristics . Nitrogen pollution is a more widespread contamination , the degree of harm to human health . Recent years, despite the problem of nitrogen pollution by a larger concern , yet to on Chengdu groundwater nitrogen pollution specifically . Therefore, the analysis of the nitrogen pollution of shallow groundwater in Chengdu region , research is necessary . According to the actual situation of the three nitrogen pollution in the shallow groundwater in Chengdu , combined with the hydrogeological conditions of the Chengdu region , the analysis of groundwater quality data of the past two decades , the study of three nitrogen migration and transformation of shallow groundwater in Chengdu and its influencing factors , regression analysis and its influencing factors . That three of the Chengdu region shallow groundwater nitrogen pollution mainly by the impact of the point source , urban sewage and garbage pollution is increasingly serious . Nitrogen Levels in the spatial distribution of the characteristics of a strong anisotropy and pollution situation improved markedly after 2000 . Nitrate content is high in the northwest corner of the downtown area of the Chengdu region ; nitrite the rhinoceros of Cape Town - Tower Hill Park first-line content is higher ; ammonium ion content high point in the downtown area . Migration and transformation of the three nitrogen discharged directly by groundwater recharge conditions , aquifer type , groundwater outcrop the combined effect of the depth and groundwater chemical characteristics . The study found that three nitrogen content in groundwater chemical characteristics of iron , manganese ions are the key elements affect the conversion of nitrogen . Chengdu region aquifer sand , sand and gravel layer containing the original pig iron , and manganese help to prevent the diffusion of nitrogen pollution in groundwater . Generally speaking , in recent years , Chengdu groundwater nitrate content and the contaminated area is small , the impact on the water quality is also smaller , mainly present in the groundwater discharge zones . Nitrite and ammonium ions impact , pollution area , and are mainly concentrated in densely populated areas . In the subsequent pollution prevention need attention.