Conversion relationship between surface water and groundwater based on stable isotopes of D and ¹⁸O of new town in the northern Wuhan, Hubei

This paper is the result of hydrogeological survey engineering.

Object Reveal the characteristics and interaction of D and ¹⁸O between surface water and groundwater in the northern new town of Wuhan,

Methods 7 precipitation samples, 6 river samples, 14 reservoir samples, 98 minjing samples, 3 spring samples and 11 borehole samples were collected and measured in 2019, what' s more, 50 monitoring data of Wuhan station from 1986 to 1998 were collected. The research methods of D and ¹⁸O spatial analysis and watershed analysis are carried out in this paper.

Results (1) The D and ¹⁸O isotopes of precipitation in Wuhan vary with seasons, and the negative correlation between isotopic value and precipitation indicates "rainfall effect", but the no correlation between isotopic value and temperature indicates "no temperature effect". (2) Due to strong evapotransporation, the surface water shows the certain correlation between isotopic value and geomorphic types, and the main stream is enriched in stable isotopic, while the tributaries is depleted; (3) Groundwater such as wells, springs and boreholes are all derived from atmospheric precipitation, and the stable isotopes value of groundwater is related to the buried depth and geomorphic type; (4) During the dry season, the Jiehe River is recharged by upstream reservoir and underground water in the Jiehe basin, and the XiaJiasi reservoir is recharged by underground water in the XiaJiasi reservoir basin.

Conclusion D and ¹⁸O can significantly improve the understanding of the conversion relationship between surface water and groundwater in the northern new town of Wuhan.