Analysis Of Groundwater Resource And Vulnerability Assessment In Typical Area Of North Of Qinling Mountains Illustrated By The Case Of Tongguan County

With the rapid development of social economy,the shortage of water resources and environmental pollution are becoming more and more serious,people pay more attention to the exploitation and utilization of water resources,especially the groundwater resources.Based on the current situation investigation data collection and verification calculation model is established to establish the analysis and evaluation methods to clarify the distribution characteristics of groundwater resources and the status of groundwater pollution.Then,establish the evaluation system of groundwater pollution vulnerability in the research area.Be aimed at to provide countermeasures and suggestions for groundwater sustainable development and utilization and protection.This paper choose the typical regions in north of Qinling Mountains to develop groundwater resources and vulnerability evaluation of investigation and analysis,which based on the research of Tongguan county water resources investigation project,with a special investigation of groundwater resources evaluation and vulnerability analysis as the research target.Using accurate GPS satellite positioning system,the shallow groundwater resources in tongguan county were analyzed and evaluated through field reconnaissance and data collection.The current fresh water and brackish water resources in the research area were further verified and calculated,the total groundwater resources were summarized,and the water quality analysis of samples taken in the field was analyzed.Pollution to groundwater resource vulnerability evaluation at home and abroad were reviewed by apllied to more research methods,in combination with the practical situation of the field work in the study area,considering human activity effect in the study area and pollution status quo,to establish suitable for groundwater vulnerability evaluation system in the study area.Using MapGis software,the groundwater pollution vulnerability in the research area was studied by qualitative or quantitative description.It provides a strong basis for groundwater resource planning and utilization and potential pollution prevention.Through a series of analytical studies,this paper draws the following conclusions.(1)This paper based on the typical area of groundwater resources as the research object.The research is divided Tongguan county into two parts of north of the loess tableland area,low-order region and the south of Qinling Mountain area,and then calculated respectively through natural recharge of groundwater resources.Due to the similarity of recharge characteristics in the low terraces and loess tableland in the north of Tongguan county,the research degree is quite similar,so the method of replenishment is adopted in the low-order area of loess tableland.The southern Qinling Mountain area is mainly composed of bedrock fissure aquifer,and the natural resource supply of groundwater is calculated by the method of excretion.Finally,the natural recharge resource of Tongguan county was 5625.51x104m3/a.The groundwater runoff in Qinling Mountain area was 971.47×104m3/a.Based on the water balance foundation,the groundwater runoff output was 98.72×104m3/a.The analysis shows that the general distribution law of natural recharge resources in the shallow groundwater in Tongguan county is that the groundwater resources in the loess tableland are poor,but some of them are moderately rich.The river valley is rich in resources and water.But the mountains are poorer of natural recharge resources.(2)It adopts the Shug Kalev's classification,which is studied at home and abroad.The water chemistry types were classified according to the results of 37 groundwater samples obtained in the study area,draw water chemistry type zoning map;The groundwater quality standard was used to evaluate the distribution characteristics of different quality groundwater in the study area,after that,the contour map of groundwater mineralization is drawn;Based on the method of single component evaluation and comprehensive evaluation,the groundwater quality comprehensive evaluation level table was established and the F value contour map was drawn.Finally,based on the evaluation results,a comprehensive evaluation scale was established to evaluate the groundwater quality in the research area.(3)Based on the DRASTIC model,two evaluation factors of human activities and pollution status in the research area were taken into consideration,and the new evaluation system for groundwater vulnerability was established.The vulnerability level of groundwater pollution in the research area was constructed and the vulnerability was partitioned by MapGis software.The results show that most of the research area belongs to the middle pollution vulnerable zone,some areas belong to the strong pollution vulnerable zone,and a few areas are not easy to pollute.There is a good consistency between the strong pollution and the groundwater quality distribution of V.Based on the evaluation of groundwater pollution vulnerability in the study area,the pollution prevention measures such as heavy metal pollution repair,pollution source control,groundwater pollution monitoring and protection zone division were put forward.