| Groundwater resources are very precious water sources for domestic,industrial and agricultural water.In order to better develop and utilize groundwater resources,it is necessary to ascertain its occurrence and related influencing factors in advance,determine the quantity and quality of groundwater,so as to better improve the efficiency.In this thesis,through a combination of field investigation and theoretical research,the hydrogeological characteristics and Karst development laws of the Yong'an Dahu Basin were deeply studied.Combined with geological structure and other conditions,the groundwater enrichment mode was studied,and the classification and main control factors of different groundwater enrichment modes were proposed.and the correlation network diagram between the enrichment mode and the control factors was established,and a targeted groundwater development and utilization plan was proposed.The main results are as follows:(1)After Analyzing the characteristics and laws of surface and underground Karst development in the area,the Karst development degree of Yong'an Dahu Basin was found to have a trend of gradually weakening with the decrease in elevation and increase in depth;According to the Karst form in the area and the distribution of Karst rate exposed by drilling according to the research results of the situation,the study area was further divided into three areas with strong Karst development,medium Karst development and weak Karst development.(2)The systematic study has concluded that the Yong'an Dahu Basin has 4 types and 9 types of Karst groundwater enrichment patterns.The four main categories are regional geomorphic water collection models,local geomorphic water collection model,local structural water collection model and composite water collection model,etc.9 sub-categories are regional basin water collection model,mountain depression water collection model,underground dark River catchment model,fold catchment model,rift valley catchment model,fault catchment model,water blocking fault blocking catchment model,strong and weak contact zone catchment model,structural compound catchment model,etc.There are often cross-overlaps between models.The corresponding horizontal and cross-sectional diagrams of each model were drawn,and the characteristics of different types of enrichment models and typical areas in the area were analyzed,and the corresponding distribution of different enrichment models in the area was determined.(3)The control effects of factors such as stratum lithology,geological structure,neotectonic movement,topography and geomorphology,limestone burial conditions,groundwater chemistry and hydrodynamic conditions on the enrichment model of Karst groundwater were systematically analyzed,and the enrichment models and Correspondence network diagram between control factors.(4)In view of the above-mentioned enrichment models and control factors,the groundwater resources in the Yong'an Dahu Basin were divided into three different utilization areas: suitable mining area,controlled mining area,and difficult planning utilization area.The development and utilization of different types of Karst groundwater such as Karst springs,underground rivers,and pumped wells in the Yong'an Dahu Basin were studied,and specific proposals for the development and utilization of Karst groundwater were put forward.The research of the thesis will help to find out the Karst groundwater enrichment rules and distribution conditions in the Yong'an Dahu Basin,and then favorable areas suitable for mining Karst groundwater were delineated,the directions of water search were determined,and the control of groundwater by factors such as geological structure and hydrodynamic conditions was improved.The research will provide scientific guidance significance for rational planning and efficient exploitation of water resources,and regional ecological and environmental protection. |
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