| The Yinchuan Plain in the study area has excellent natural conditions and dense urban areas.The large population makes the Yinchuan Plain a large amount of water,so the amount of groundwater exploitation in the area has increased year by year.The centralized mining of water sources is an important way to obtain groundwater in Yinchuan Plain.Therefore,the protection of groundwater sources has become a top priority.In order to ensure the sustainable use of groundwater in the water source,the water quality of the residents is good.This time,the division of the protected area in the Yinchuan Plain is carried out and the corresponding management suggestions are put forward.According to domestic and foreign experience and relevant laws and regulations,the purpose,basis and principle of the division of water source protection areas are expounded,and the five division methods are introduced separately,combined with the specific topography,hydrology,mining quantity and other factors of the Yinchuan Plain water source.The empirical formula method and the numerical model method are selected.According to the hydrology and geology of the water source in the Yinchuan Plain,the distribution pattern of the production wells in each water source is set.And analyze the specific characteristics of the water source,and divide it into three categories,namely the submerged water source of the piedmont alluvial plain,the diving of the river and lake plain,and the confined water source.The typical water source is selected in turn to divide the protected area.Take the water source area of the Helan Mountain Genggou coal mine area as an example.The formula and numerical method are used to divide the protected area.After comparing the results,the numerical method is used to obtain the first-level protection area of 0.014km~2,the secondary protection area is 1.596km~2,and the quasi-protection area is 6.419km~2.Take the water source of Xiaoba Town in Qingtongxia City as an example.The division is also carried out,and the results of the numerical method are selected and incorporated into the river.The area of the first-level protection area is 0.009 km~2,the area of the second-level protection area is 1.989km~2,and the area of the quasi-protection area is 14.428km~2.Take the water source of the western part of Pingluo County as an example.Using the numerical method and considering the mass migration distance of the submersible and confined water,the area of the first-level protection area is0.002km~2,the area of the secondary protection zone is 0.412m~2,and the area of the quasi-protection zone is 3.954km~2.Considering the consideration of pollution factors in the study area,the solute transport is carried out,and the nitrate is selected as the solute transporting particles,and the pollution status simulation of the study area and the simulation of the sudden pollution of the river are carried out respectively.The Ningxia Chemical Plant II water source is most polluted by the current state of nitrate pollution,and the water quality is gradually restored without leakage.Therefore,the pollution scope is included in the quasi-protection zone.The sudden pollution of rivers has a relatively small impact on the water quality of the water source,and its scope has been included in the scope of the protected area,but it is also necessary to increase the monitoring of the Yellow River.Appropriate methods are summarized for the entire Yinchuan Plain.The total area of the first-grade protection area in the study area is 0.19km~2,the total area of the secondary protection area is 30.16km~2,and the total area of the quasi-protection area is 181.99km~2.According to the scope of the protected areas at all levels,with reference to relevant laws and regulations and related materials,the management monitoring recommendations for the water source protection areas shall be proposed. |
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