| Pingtan Island is a water resources-deficient island area.The development of the Pingtan Comprehensive Experimental Zone has been severely restricted by water resources.The development and utilization of water resources has become an important way to solve water shortage on the island.On the basis of making full use of the surface water resources,how to plan,develop and protect the groundwater resources in the island is an important problem in the resources development and utilization of groundwater.Therefore,the division of shallow groundwater function zones in Pingtan Island is of great significance to the development and utilization of groundwater resources and the development of economy and society.Based on the collection and analysis of the hydrogeology and groundwater development and utilization data of Pingtan Island,a shallow groundwater function evaluation system was construct in this paper,which is composed of element index layer,attribute index layer,function criterion layer and system target layer.In this paper,those influencing factors are summarized from the three aspects of drive-state-response and used as the basic element index layer;The function criterion layer includes resource function,ecological function and geological environment function,resource function includes three attributes of occupancy,regeneration and availability,ecological function includes three attributes of landscape environment maintenance,vegetation environment maintenance and land environment relevance,and geological environment function includes one attribute of groundwater system decay.Based on expert experience and knowledge,AHP was used to weight the indexes of each level of the shallow groundwater function evaluation system and the consistency checks were performed.In this paper,the additive synthesis model was used to construct a comprehensive evaluation model of shallow groundwater function,the shallow groundwater function evaluation grading system was conducted from three aspects of resource function,ecological function,and geological environment function,which provided a basis for groundwater function zone division.Based on the constructed the shallow groundwater function evaluation system and comprehensive evaluation model,In this paper,the index data of basic elements are normalized,and the cell network division and spatial superposition analysis of each index data are carried out by using GIS software to complete the target function and leading function evaluation of shallow groundwater in the study area.According to the actual development and utilization of groundwater resources in Pingtan Island,a two-level shallow groundwater function zone division system in the study area was established.Based on the results of shallow groundwater function evaluation and the zoning system,a scoring system of two-level shallow groundwater function zone division system in the study area was established by comparing the strong and weak relationships between groundwater resource functions,ecological functions,and geological environmental functions,which to achieve the shallow groundwater function zones division in Pingtan Island.The groundwater exploitation potential and water abundance index were selected for reliability analysis of the division results.The results are as follows:(1)The area of shallow groundwater development zone is 90.37 km~2,which is 30.62%of the total study area,and the mining potential of study area is relatively large.Among them,the area of centralized water supply water source zone is 62.33 km~2,mainly distributed in Luyangpu Plain,Lianjiupu Plain,Longwangtoupu Plain and Qilipu Plain.The area of decentralized development and utilization zone is 28.04 km~2,which is 9.50%of the total study area,which is mainly distributed in the north foot of Junshan mountain,the middle of Zhonglou Town,Liushui Town,the north of Tancheng town and Yangzhongyangpu plain.(2)The area of shallow groundwater protection zone is 142.99 km~2,accounting for48.44%of the total area of study area.Among them,the area of ecologically fragile zone is46.61 km~2,mainly distributed in the south of su’ao Town,Junshan mountain foot,aoqian Town,Thirty-Six-Foot Lake nature reserve area and the south of Aodong town.The area of groundwater source conservation zone is 96.39 km~2,which is mainly distributed in the hilly bedrock area of the study area.(3)The area of shallow groundwater preserved zone is 61.82 km~2,which is 20.94%of the total study area.The area of unsuitable exploitation zone is 41.384 km~2,which is mainly distributed in the reclamation area,the seawater intrusion area of zhuyukou and the salt field of Huoshaogang.The area of the reserve zone is 20.44 km~2,accounting for accounts for 6.92%of the total area of study area,which is mainly distributed in the west of Luyangpu Plain and the south of Qilipu Plain.Through reliability analysis,the zoning results in this paper have good reliability,which can provide basis and reference for the planning,development and protection of current and future shallow groundwater resources in Pingtan Island. |
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