This paper focuses on the migration and transformation of nitrogen components in groundwater during riverbed recharge through laboratory dynamic simulation experiments.In considering the effect of infiltration water on NH4+-N and NO3--N concentrations during recharge of groundwater feeds,control,sterilised,pretreated media and midline groups were selected for comparative experiments.The results show:NH4+-N and NO3--N concentrations show complex spatial and temporal variations in groundwater,with some differences in water quality evolution between treatment groups.Among them,the pretreated media group showed higher NH4+-N and NO3--N concentrations,and the indigenous bacteria may play a fa-cilitating role in nitrogen transport and transformation.In contrast,the midline group had lower NO3--N concentrations and may have been subject to the inhibitory effect of the diversion source.The experimental results in this paper provide a new per-spective for understanding the evolution of groundwater quality during riverbed recharge and provide a reference for water quali-ty management during artificial groundwater recharge.
underground waternitrogenmigration and transformationgroundwater over-exploitation
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