Evaluation Of Groundwater Resource Carrying Capacity In Beilin District Of Suihua City

As the agricultural and industrial base of Heilongjiang Province,Beilin District of Suihua City has the combined problems of serious water quality overruns and urban funnels.The characteristics of water resources have become a bottleneck that affects and restricts the sustainable development of the city's economy and society.Correctly evaluating and judging Suihua's water resources carrying capacity,putting forward reasonable suggestions,achieving sustainable regional development,and formulating development strategies that are coordinated with water resources have important practical significance for the relationship between water resources and national economic development in Beilin District of Suihua City.In this paper,Beilin District of Suihua City is selected as a typical research area.Through field sampling survey,data collection and arrangement,multivariate statistical analysis and numerical simulation,etc.,a groundwater resource carrying capacity evaluation system based on fuzzy mathematics is constructed to identify the groundwater carrying capacity of Beilin District.The key influencing factors are:establishing a model of ammonia nitrogen solute transport in groundwater in the north forest area,predicting the trend of ammonia nitrogen concentration under different scenarios,and further evaluating the response law of groundwater resource carrying capacity in the north forest area under changing conditions.The main conclusions of this study are as follows:(1)It can be seen from the monitoring results of surface water and groundwater in Beilin District of Suihua City;the ammonia nitrogen concentration in the dive shows a gradually increasing trend from upstream to downstream;the ammonia nitrogen content of the confined water shows from the supply area to the drainage area It gradually increased,but a relatively low value band of ammonia nitrogen appeared from the center of the groundwater level dropping funnel to the head of the Hongqi canal,which was mainly affected by the infiltration and recharge of the Hulan River;(2)According to the groundwater recharge,runoff,and drainage conditions in the study area,based on the source analysis functions of ~1 ~5N and ~1 ~8O isotopes,it is calculated that the nitrogen in the dive mainly comes from the nitrogen source generated by farmland irrigation in the area(about 67%);The nitrogen content in the pressurized water is about 50%contributed by the subsurface crossflow recharge.The range of groundwater affected by sewage infiltration in the drainage channel of Suisheng Drainage Suisheng Town is about 500 m;(3)Establish an evaluation model by combining fuzzy comprehensive evaluation model and analytic hierarchy process.The evaluation results show that the current carrying capacity of Beilin District of Suihua City is relatively poor.According to the data collected in the study area,it is found that groundwater overexploitation,falling hopper,and groundwater quality exceed the standard.In the case of serious and poor sewage treatment rates,the evaluation results are in line with reality;according to the single index sensitivity analysis,the results show that with the three key factors of industrial sewage discharge,the proportion of factors that are discharged into sewage treatment plants and the groundwater ammonia nitrogen exceeding standard rate change factors The good carrying capacity also becomes better,and the amplitude of the change in the bearing capacity decreases with the decrease of the ammonia-nitrogen exceeding standard ratio at 10%to 30%,and the amplitude of the change of the bearing capacity changes with the decrease of the ammonia-nitrogen exceeding standard ratio at 40%to80%.At 90%,the magnitude of the change in bearing capacity is smaller with the decrease in the ammonia-nitrogen excess ratio.(4)The groundwater carrying capacity evaluation based on the prediction results of the ammonia nitrogen solute transport model in the groundwater shows that after the ammonia nitrogen source strength in the paddy field is reduced by 30%and 50%,the ammonia nitrogen concentration in the diving and confined water after 10 years of operation shows a significant reduce;(5)Combining the simulation results with changes in the carrying capacity of the study area,the study found that as the concentration of the pollution source decreased,the ammonia nitrogen exceeding standard rate in the groundwater gradually decreased,but it was limited by the primary pollution and the huge amount of sewage discharged,and the proportion of non-discharged sewage treatment plants was higher.Impact,the improvement of groundwater carrying capacity is small in the short term.By combining the improvement of industrial sewage discharge and the proportion of non-discharged sewage treatment plants,the groundwater carrying capacity can be increased rapidly in the short term.(6)According to regional development trends and simulation results,it is shown that through comprehensive management methods,groundwater carrying capacity in the study area can be effectively improved.Therefore,it is recommended that the research area reduce human pollution as much as possible,improve sewage collection rate,promote ecological planting,reduce the amount of pesticides and fertilizers,promote the construction of sewage treatment plants,and further increase the prevention and treatment of domestic pollution;introduce advanced technology into localized use and accelerate the promotion of industry Popularization and upgrade of wastewater treatment facilities,relocation and pollution treatment and transformation of enterprises that produce serious pollution,upgrading and upgrading of existing sewage treatment plants,further strict management of industrial pollution,and increased investment in pipe network construction.