22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Identifying interactions between river water and groundwater in the North China Plain using multiple tracers

24 Sep 2019, 16:00
1h
Trade Fairs and Congress Center (FYCMA)

Trade Fairs and Congress Center (FYCMA)

Av. de José Ortega y Gasset, 201 29006 Malaga, Spain
Poster Topic 8 - Groundwater quality and pollution processes Poster with refreshments

Speaker

Mr Guoqing Wu (Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences)

Description

Interactions between river water and groundwater have been used to help understand the movement of water and to evaluate water quality in the semi-arid area of the North China Plain (NCP). Stable isotopes, chlorofluorocarbons (CFCs) and hydrochemistry were used to study the influence of surface water from the Xiao River on regional groundwater. Using a mass balance approach based on chloride concentrations, hydrogen and oxygen isotope ratios, the average fraction of surface water recharging to groundwater was 50–60 %. CFC results indicated that the groundwater recharge age varied from 22.5 to 39.5 years. The vertical flow velocity of groundwater was estimated at about 1.8–3.5 m year-1. Nitrate concentrations in groundwater varied from 9.42 to 156.62 mg L$^{-1}$, and exceeded 50 mg L$^{-1}$ in most aquifers shallower than 80 m bordering the Xiao River. The d15NNO3 data indicate that the major sources of nitrogen in groundwater are human sewage and animal excreta. Because groundwater is the main source of drinking water, there should be concern about public health related to the elevated nitrate concentrations in the NCP.

Primary author

Dr Yu Dun (Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences)

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