Abstract
Exploitation and utilization for karst groundwater is an effective way of solving the imbalance between supply and demand of water resources in Guilin City, southwestern China. To better develop and utilize karst groundwater, the development characteristics of underground karst in Guilin City and their influence on the development of karst groundwater were systematically investigated. The results show that the thick limestone formation of D3r is the most ideal aquifer because it has the highest karst development and the most abundant karst groundwater. The main karst development zone is above 90 m a.s.l., and accounting for 88.5% of the karst caves, 11.5% karst caves are located in the weak karst development zone of 40–90 m a.s.l, and below 40 m a.s.l., the karst is not developed. Thus, the borehole depth for groundwater exploitation is suggested to be approximately 100–120 m owing to the ground-surface elevation of Guilin City being 140–160 m a.s.l. The zone above 120 m a.s.l. is not optimal for karst groundwater exploitation because of its high karst cave filling rate (82.89%) and low water-filling cavity ratio (16.95–30.08%), in which the karst groundwater is easily connected with surface water, therefore, an increase of possibility of collapse when abstracting groundwater. The zone between 120 and 90 m a.s.l. could be more optimal for groundwater extraction due to its medium scale of karst caves, relatively low karst cave filling rate (62.07%), and high water-filling cavity rate (30.43–62.10%) relatively. Meanwhile, a favorable groundwater exploitation and utilization region is located in the eastern study area, which has the highest underground karst development, with the highest percentage of boreholes encountering caverns (80.21%), linear karst rates (8.58%), and the medium karst cave filling rate (65.61%). This study provides a scientific basis for the exploitation of karst groundwater and construction of a backup emergency water sources for Guilin City.
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Funding
This work was financially supported by Natural Science Fund Project (42372294) and China Geological Survey’s Project (DD20221758). Special thanks are given to Prof. Qin Xiaoqun for his valuable comments and suggestions. Hydrogeological Survey and Water Resources Assessment of the Pearl River Basin, DD20230081.
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All authors contributed to the study conception and design. Pu is responsible for research methods, experimental design, data collection, processing and analysis, and writing papers, Huang is responsible for the planning, design and implementation of the entire study. Guarantee the completeness and accuracy of the study. Provide economic and technical support, Li, Zou, Liao, and Zhao participated in the research design, method selection, etc., assisted in data collection, processing and analysis, and provided experimental equipment, technology, and paper writing suggestions; Wu, Luo, and Jiao provided suggestions for paper writing. The first draft of the manuscript was written by Pu. and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Pu, Z., Huang, Q., Liao, H. et al. Underground karst development characteristics and their influence on exploitation of karst groundwater in Guilin City, southwestern China. Carbonates Evaporites 39, 34 (2024). https://doi.org/10.1007/s13146-024-00939-4
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DOI: https://doi.org/10.1007/s13146-024-00939-4