Remediation of polluted sites in the typical area of karst underground river based on "Three-Source Model": A case study in the Pingqiao underground river system, Zunyi, China
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摘要:
在分析岩溶地下河系统范围内水源、污染源特性的基础上，建立了双源调查、源汇追踪和源头阻控为主要内容的岩溶地下河污染修复治理模式——三源模式。以遵义市坪桥地下河系统为例，利用三源模式对该地下河污染进行修复治理实践。结果表明：研究区分布有各类水点25处，以钻孔、岩溶泉点、地下河出口为主，特征污染物为以NH
$_4^{+}$ ${\rm{NO}}_3^{-}$ ${\rm{SO}}_4^{2-}$ $_4^{+}$ ${\rm{NO}}_3^{-}$ ${\rm{SO}}_4^{2-}$ $_4^{+}$ $_4^{+}$ Abstract:Karst groundwater is an important water resource in karst areas of China and even the world, playing a crucial role in residents' daily life and industrial and agricultural production. The soil layer in karst areas is generally thin, with a double-layer structure between the surface and underground. Pollutants can directly enter the underground aquifer through thin soil layers, sinkholes, skylights, and karst cracks, making the karst groundwater extremely susceptible to pollution. In recent years, human's industrial and agricultural activities and domestic pollution have caused a large number of various types of organic and inorganic pollutants to continuously enter the underground river, posing a huge threat to the safety of drinking water and ecological agriculture development of local residents. Therefore, pollution remediation of underground rivers is of great significance for the protection of karst underground water resources. Focusing on water sources and pollution sources, this study conducts a systematic analysis of the investigation, evaluation, and remediation process of underground river pollution. It establishes a pollution remediation and control model of karst underground rivers—the "Three Source Model". This model mainly includes dual-source investigation, source tracking, and source control.
As a typical dendritic underground river in the exposed karst area of Southwest China with a pollution history of nearly 20 years, the Pingqiao underground river in Zunyi City, was selected as the study area for remediation and control of the pollution in the underground river with the use of "Three-Source Model". The results show: (1) There are 25 water points in the study area, mainly boreholes, karst springs and underground river outlets, and the characteristic pollutants are mainly NH
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Key words:
- underground rivers /
- pollution /
- remediation /
- dual-source /
- near-source interception /
- curtain engineering
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