| 南小河沟流域地表水和地下水的稳定同位素和水化学特征及其指示意义 |
| 摘要点击 2479 全文点击 978 投稿时间：2019-05-23 修订日期：2019-09-27 |
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| 中文关键词 氢、 氧稳定同位素 水化学 电导率 地表水和地下水 黄土高原沟壑区 |
| 英文关键词 hydrogen and oxygen stable isotopes hydrochemistry electric conductivity surface water and groundwater gully region of the Loess Plateau |
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| 中文摘要 |
| 南小河沟流域为典型的黄土高原沟壑区，本文分析了该流域地表水和地下水的氢氧稳定同位素和水化学特征，揭示了地表水与地下水之间的相互关系.结果表明，大气降水的δD和δ18O值呈现春夏高，秋冬低的季节变化特征.水库水的δD和δ18O值的季节性变化规律呈现夏秋高、冬春低的特征.地下水的δD和δ18O值季节性变化规律相对不显著.流域内地表水和地下水水化学类型主要为Na·Mg-HCO3型.地表水和地下水电导率的季节性变化规律均呈现冬季高、夏季低的特点.当地大气降水和深层地下水可能是南小河沟流域内地表水（水库水、沟道水）和泉水的主要补给来源.流域内的常流泉可能主要由深层地下水补给，而季节泉，例如，董庄沟和杨家沟的源头泉则可能是由深层地下水和当地大气降水共同补给. |
| 英文摘要 |
| The Nanxiaohegou basin is a typical watershed in the gully region of the Loess Plateau, China. The stable isotopes of hydrogen and oxygen and the hydrochemistry of the surface water and groundwater in the region were characterized in this study. The interaction between the surface water and groundwater in the region was demonstrated based on stable isotopes and hydrochemical methods. Results show that the δD and δ18O values of precipitation change according to the seasons with high values in spring and summer and low values in autumn and winter. The δD and δ18O values of the reservoir water are higher in summer and autumn, while they are lower in the winter and spring. The seasonal variation of δD and δ18O in groundwater is not significant. The surface water and groundwater in the watershed mainly belong to Na·Mg-HCO3-type water. The hydraulic conductivity of surface water and groundwater is characterized by high values in winter and low values in summer. Results on stable isotopes and hydrochemistry indicate that local precipitation and deep groundwater may be the main recharge sources of surface water (reservoir water, channel water) and spring water in the Nanxiaohegou basin. The perennial spring in the basin may be mainly replenished by deep groundwater, while seasonal springs are replenished by deep groundwater and local precipitation, such as the springs of Dongzhuanggou and Yangjiagou sub-basins. This study provides a greater understanding of the hydrological processes in the gully region of the Loess Plateau. |
