Design And Application Of Assessing Index System Of Groundwater Resources Carrying Capacity In Naoli River Irrigation Area

Water resources play an extremely important role in social development,economic growth,and ecological regulation.As the country continues to tamper with the original vegetation areas in the Naoli River Basin,the agricultural planting structure has been continuously adjusted,and the area of paddy fields in the well irrigation area has increased rapidly;Due to the over-exploitation status and the lack of unified planning for water resources,the contradiction between the supply and demand of water resources in some areas of the Naoli River Basin has become increasingly prominent and has become a bottleneck restricting industrial and agricultural development in the region.Based on the summarization,analysis and analysis of the research results of groundwater carrying capacity evaluation,taking the Naoli River Basin as the research area,screening the evaluation system and evaluation criteria and evaluating the groundwater resource carrying capacity,and calculating the groundwater numerical simulation method.Groundwater resources exploitation potential is relatively comparable,and the rationality of the selected evaluation index system is analyzed;on this basis,the groundwater resource bearing capacity evaluation system for the irrigation area in the Naoli River Basin is reconstructed and evaluated,and a set of groundwater suitable for the research area is established.The index system of resource carrying capacity evaluation completed the status quo evaluation and trend analysis of groundwater resource carrying capacity.The specific conclusions are as follows:(1)Combining the evaluation results of domestic groundwater carrying capacity,preliminary evaluation of the groundwater carrying capacity evaluation index system in accordance with the study area,including 8 indicators including the irrigated rate of cultivated groundwater resources,utilization of groundwater resources,development and utilization of groundwater resources,etc.;The principal component analysis method evaluated the groundwater carrying capacity in the study area and the irrigation area.The results showed that the Jixianxiaohuanghe irrigation area,the Xingfu irrigation area,the Jinxi irrigation area,the Youyixibu irrigation area,the 597 irrigation area,the Sanhuanpao irrigation area,the Longtouqiao irrigation area,the Jianshanzi irrigation area,the Hamatong irrigation area,and the Qiliqin irrigation area still have a certain degree of mining potential;the scale of groundwater exploitation in the 291 nanbu irrigation area,the Fujin irrigation area,the Dongxiezong irrigation area,the Jinnan irrigation area,the 853 irrigation area is of medium level,if over mining continues,over-exploitation will occur.The Daxing irrigated area is nearly saturated or overloaded;The development and utilization of water resources has reached its development capacity;If the exploitation volume is increased,there is a risk of negative environmental geology effects.(2)The groundwater flow numerical simulation model was established and the model identification and verification were completed.And the Modflow software is used to calculate the total recharge,the recoverable amount of groundwater resources and groundwater exploitation rate in each irrigation area,and then the exploitation potential of groundwater resources in each irrigation area is analyzed.(3)Based on the comparison between the preliminary results of the evaluation of groundwater carrying capacity and groundwater exploitation potentials calculated by groundwater numerical simulation methods,the evaluation index system for groundwater resource carrying capacity in the irrigation area of the Naoli River Basin was reconstructed,and The index of exploitation and utilization of groundwater resources and the index of per capita water supply were removed,and the index of groundwater resources per mu was added,determine the evaluation criteria;subdivide the groundwater carrying capacity level into 5 levels,can more clearly determine the scale of socio-economic development on the pressure of water resources,the consistency between the evaluation results of groundwater resources carrying capacity based on the index system and the evaluation results of numerical methods is obviously improved.(4)The assessment results of groundwater resource carrying capacity based on the revised indicator system indicate that the groundwater resource carrying capacity of the Hamatong irrigation area is of very high grade(Grade i)and has good potential for exploitation;The groundwater resource carrying capacity of Jixianxiaohuanghe irrigated area,Sanhuanpao irrigated area,the Longtouqiao irrigated area,the Jianshanzi irrigation area and the Qiliqin irrigation area is relatively high(Grade ii)and has good potential for exploitation;The groundwater carrying capacity of the 597 irrigated area is of medium level(Grade iii),if the mining continues,the super mining phenomenon will occur;The groundwater carrying capacity of the Xingfu irrigated area and the Fujin irrigation area and the Jinxi irrigation area has low groundwater carrying capacity(Grade iv),and the potential for continued exploitation is small;The exploitation of groundwater in the 291 nanbu irrigation area,the Dongxi irrigation area,the Youyixibu irrigation area,the Jinnan irrigation area,the Daxing irrigation area and the 853 irrigation area has been overloaded(Grade v),mining should be reduced and protection should be strengthened.