Underground karst development characteristics and their influence on exploitation of karst groundwater in Guilin City, southwestern China

IF 1.1 4区 地球科学 Q3 GEOLOGY
Zhenggong Pu, Qibo Huang, Hongwei Liao, Huaying Wu, Youjun Jiao, Fei Luo, Tengfang Li, Guangshuai Zhao, Changpei Zou
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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.

Abstract Image

中国西南部桂林市地下岩溶发育特征及其对岩溶地下水开发利用的影响
开发利用岩溶地下水是解决桂林市西南地区水资源供需失衡的有效途径。为了更好地开发利用岩溶地下水,系统研究了桂林市地下岩溶的发育特征及其对岩溶地下水发育的影响。结果表明,D3r 厚石灰岩层是最理想的含水层,因为它的岩溶发育程度最高,岩溶地下水最丰富。主要岩溶发育带在海拔 90 米以上,占岩溶洞穴的 88.5%,11.5%的岩溶洞穴位于海拔 40-90 米的弱岩溶发育带,海拔 40 米以下岩溶不发育。海拔 120 米以上的岩溶洞穴充水率高(82.89%),充水溶洞率低(16.95%-30.08%),岩溶地下水易与地表水连通,取水时塌陷的可能性增大,因此不适宜开采岩溶地下水。海拔 120 至 90 米之间的区域,由于岩溶洞穴规模中等,岩溶洞穴充水率相对较低(62.07%),充水空洞率相对较高(30.43-62.10%),因此更适宜开采地下水。同时,研究区东部是地下水开发利用的有利区域,地下岩溶发育程度最高,钻孔遇溶洞率最高(80.21%),线性岩溶率最高(8.58%),岩溶洞穴充水率中等(65.61%)。该研究为桂林市岩溶地下水开发利用和应急备用水源建设提供了科学依据。
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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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