东营地区地下水的水化学及海水入侵时空分布特征OA北大核心CSCDCSTPCD

By integrating mathematical statistics with Piper and Gibbs diagrams,we characterized the hydrochemi-cal evolution of groundwater in Dongying,Shandong,from 2017 to 2024 and employed a single-factor index to delineate the spatiotemporal patterns and driving factors of seawater intrusion.The results show that the aquifer is weakly alkaline and highly mineralized,dominated by Na⁺ and Cl⁻,with Cl-Na and HCO₃-Na as the prevailing water types.Seawater intrusion is indicated in 73%of the monitoring wells,including 59%with severe intrusion,primarily concentrated in northwest and central Dongying and along the Yellow River corridors.No intrusion is detected in the southwestern Guangrao District.Since 2017,except for transient fresh-saline alternations at the in-trusion interface,most sites do not show notable abatement.Ion ratios and Gibbs modeling reveal that salinization results from the coupled effects of geological structure,paleo-seawater entrapment,intense evaporation,exter-nal-water dilution,and groundwater overexploitation.These findings provide a scientific basis for early warning of saline intrusion and sustainable groundwater management in the Yellow River Delta.