地下水人工补给中河床沉积物氮铁锰及赋存形态的变化研究  

Study on the changes of nitrogen, iron and manganese in riverbedsediments and their storage patterns in artificial groundwater recharge

作　　者：李玉龙 LI Yu-long(The First Hydro-logical and Engineering Geological Survey Institute of Anhui Geological Survey Bureau,Bengbu 233000,Anhui,China)

机构地区：[1]安徽省地勘局第一水文工程地质勘查院,安徽蚌埠233000

出　　处：《地下水》2024年第2期37-39,共3页Ground water

摘　　要：本文针对地下水人工补给方法,通过分析某河上下游的河床沉积物总氮铁锰及赋存形态所占百分比的变化,揭示了地下水补给后河床沉积物不同深度处化学组成的变化。结果表明,沉积物中的氮形态百分比在上下游具有显著差异,总氮含量在下游逐渐增加,且河道污染可能导致氮含量的增加。不可转化态-氮(Res-N)在各深度处具有较高的含量;从上游到下游,总铁和总锰含量的平均值在逐渐降低,碳酸盐结合态-铁(Carb-Fe)和离子交换态-铁(EXC-Fe)在上下游间的变化幅度较小,河床沉积物中锰的含量主要以不可转化态-锰(Res-Mn)为主。结果可为河流生态环境保护与管理提供重要参考。This paper reveals the changes in the chemical composition of riverbed sediments at different depths after groundwater recharge by analyzing the changes in the percentage of total nitrogen,iron and manganese,and fugitive forms in the riverbed sediments of upstream and downstream reaches of a river,with respect to the method of artificial groundwater recharge.The results show that,percentage of nitrogen forms in sediments differed significantly upstream and downstream,with total nitrogen content gradually increasing downstream,and river pollution may have contributed to the increase in nitrogen content.The non-transformable-nitrogen(Res-N)has a high content at all depths;From upstream to downstream,the mean values of total iron and total manganese contents were gradually decreasing,carbonate-bound state-Fe(Carb-Fe)and ion-exchanged state-Fe(EXC-Fe)varied less between the upstream and downstream,and manganese contents in the riverbed sediment were mainly dominated by non-transformable state-Mn(Res-Mn).The results can provide an important reference for river ecological environment protection and management.

关 键 词：地下水人工补给 野外试验 河床沉积物 氮 铁锰 

分 类 号：P641.74[天文地球—地质矿产勘探]