广西典型岩溶水系统环境中<sup>222</sup>Rn的分布及指示意义

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Abstract The radioactive isotope radon originates from decay of uranium in the stratum. ²²²Rn has a half-life of 3.82 days, and the activity of ²²²Rn has significant difference in groundwater and surface water. The application of ²²²Rn in understanding hydrological process grows quickly in recent years, while it has less study in karst environment. Three karst water systems in Guangxi were taken as examples to study the characteristic of ²²²Rn in karst environment and its indicating meaning. It was found that the activity of ²²²Rn was less than 500Bq/m³in the upper aeration zone, while it had local anomaly high in unsaturated zone, which is related to local geological structure. In saturation zone, the residence time of groundwater, the mixing proportion of different groundwater components, and the length of the radon transport along the flow paths causes the different of ²²²Rn activity. In general, ²²²Rn in karst conduit media is higher than that in fissure media, and ²²²Rn in thick soil covering layer is higher than that in thin soil covering. In the discharge zone of big karst water systems, groundwater usually flows to river, and sometimes river can flow back into the spring outlet. Because the significant difference between ²²²Rn in groundwater and surface water, ²²²Rn might be an ideal tracer of quantifying groundwater-surface water interaction.

Key words： karst environment ²²²Rn groundwater hydrological process GW-SW interaction

Received: 06 February 2021

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X523

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	GUO Fang
	WEI Li-qiong
	JIANG Guang-hui

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GUO Fang,WEI Li-qiong,JIANG Guang-hui. Characteristic of radon in typical karst water systems and its indicating significance in Guangxi, China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4294-4299.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4294

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