Using stable isotopes and major ions to investigate the interaction between shallow and deep groundwater in Baiyangdian Lake Watershed, North China Plain

Abstract

Abstract:In arid/semi-arid regions, consumption of deep groundwater resources is increasing due to growing water demand in every sector. Intensive groundwater surveys focused on the Baiyangdian Lake Watershed (BLW) in the northwest of the North China Plain, as the BLW suffers from serious water problems due to high economic growth and improper groundwater resource utilization.To clarify the interaction between shallow and deep groundwater, samples of surface water and groundwater in different aquifers were collected from two cities (Baoding City and Dingzhou City). Major trace element solute ion concentrations and stable isotopes of δ 18 O and δ 2 H revealed that, in a specific region of Baoding, anthropogenic activities have induced interaquifer recharge from Aquifer 1 to Aquifer 2 based on the similarity in chemical tracers. However, such an interaction could not be found in other regions in the study area.

High Hexavalent Chromium Concentration in Groundwater from a Deep Aquifer in the Baiyangdian Basin of the North China Plain

“…At the same time, shallow groundwater at depths <150 m is characterized by high TDS (>1000 mg/L) with high concentrations of Cl – , Na + , SO 4 2– , and HCO 3 – . , The high salinity and elevated NO 3 – in the shallow groundwater suggest modern recharge with some anthropogenic contamination (e.g., agricultural irrigation). Among the studied shallow groundwater, around 21% had TDS exceeding the Chinese MCL (1000 mg/L), 20% contained SO 4 2– concentrations exceeding the Chinese MCL (250 mg/L), and 12% had Mn concentrations exceeding the Chinese MCL (100 μg/L)…”

Identification of seawater intrusion signatures through geochemical evolution of groundwater: a case study based on coastal region of the Mahanadi delta, Bay of Bengal, India

“…The extent of seawater intrusion can be gauged by comparison of the ionic ratios of seawater and groundwater (Vengosh and Rosenthal 1994;Rosenthal 1987). Similarly, stable isotopes of groundwater (δ 18 O and δ 2 H) have also been used to trace the provenance of water and understand recharge mechanisms and climate variability (Aggarwal et al 2005;Clark and Fritz 1997) and groundwater flow systems in a coastal aquifer system (Zhang et al 2016;Han et al 2011;Tsujimura et al 2007).…”