| 小浪底水库水沙调控期滨河湿地地下水与河水转化关系 |
| 摘要点击 2422 全文点击 1740 投稿时间：2021-12-13 修订日期：2022-03-30 |
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| 中文关键词 水沙调控 水化学 氢氧稳定同位素 转化关系 小浪底水库 |
| 英文关键词 water and sediment regulation hydrochemistry hydrogen and oxygen stable isotopes transformation relationship Xiaolangdi Reservoir |
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| 中文摘要 |
| 以小浪底水库下游武陟湿地为研究区，综合运用数理统计、水文地球化学和同位素技术相结合的方法，研究了小浪底水库水沙调控期滨河湿地地下水与河水转化关系.结果表明，小浪底水库调水调沙期间下游水体阳离子以Na+、Ca2+和Mg2+为主，阴离子以HCO3-为主.调水调沙初期河水水化学类型为HCO3-Na·Ca·Mg型，地下水水化学类型为HCO3-Ca·Mg·Na型；调水调沙中期和末期河水均为HCO3·SO4-Na·Mg型，地下水均为HCO3-Na·Mg型.水库水沙调控过程中，水体的水化学组分从受碳酸盐和硅酸盐矿物溶解的共同作用过渡到以碳酸盐岩溶解为主.随着调水调沙的进行，河水与近岸带地下水的氢氧同位素组成逐渐富集，表明河水来源于上游水库表层水和大气降水，地下水则受到河水与大气降水的共同补给.在上游来水与水文地质条件等因素影响下，滨河湿地地下水与河水之间的转化主要发生在近岸带（距离河岸0~100 m内），表现为河水补给地下水，随着调水调沙的进行，河水对地下水的补给增强. |
| 英文摘要 |
| The influences from the dam and water and sediment regulation of Xiaolangdi Reservoir on the transformation relationship of groundwater and river water in the lower Yellow River remain unknown. Here, the riparian wetlands downstream of Xiaolangdi Reservoir were selected as the study area, located in Wuzhi, Henan province. To illustrate the relationship between groundwater and river water conversion in the riparian wetland during the water and sediment regulation of Xiaolangdi Reservoir, methods including mathematical statistics, hydrogeochemistry, and isotope techniques were comprehensively used. The results showed that the main cations and anions of the river water and groundwater were Na+, Ca2+, Mg2+, and HCO3- during water and sediment regulation. The river water and groundwater were HCO3-Na·Ca·Mg type and HCO3-Ca·Mg·Na type during the early period of water and sediment regulation and HCO3·SO4-Na·Mg and HCO3-Na·Mg type during the middle and late period of water and sediment regulation, respectively. The major chemical processes of river water and groundwater were controlled by carbonate and silicate rock weathering during the early water and sediment regulation period. In contrast, they were mainly derived from the dissolution of carbonate rocks during the middle and late water and sediment regulation period. Hydrogen and oxygen isotopes in river water and groundwater in the riparian zone within 100 meters of the river were relatively enriched during the middle and late period of water and sediment regulation, thus indicating that downstream river water was mainly controlled by surface water of the upstream reservoir and atmospheric deposition recharge, whereas groundwater was recharged by a mixture of river water and atmospheric deposition. Under upstream runoff and hydrogeological conditions, river water and groundwater transformation were concentrated in the riparian zone within 100 meters of the river, generally manifested in river water recharge groundwater. The recharge increased obviously during the middle and late water and sediment regulation period. These hydrochemical and isotopic characteristics of the groundwater and river water interaction in the riparian wetland contribute toward the ecological conservation of the Yellow River. |
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