Dissertation
Dissertation > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Groundwater

Nitrogen Contents and Variation Rules of Shallow Groundwater in Chengdu Area

Author WeiYuZuo
Tutor LiXiao
School Chengdu University of Technology
Course Environmental Engineering
Keywords Groundwater Three nitrogen pollution Nitrate pollution Cluster analysis Chengdu
CLC X523
Type Master's thesis
Year 2007
Downloads 250
Quotes 4
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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.

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