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 isotopeshydrochemistryelectric conductivitysurface water and groundwatergully region of the Loess Plateau

作者	单位	E-mail
郭亚文	首都师范大学资源环境与旅游学院, 北京 100048	yawen.guo@qq.com
田富强	清华大学水利水电工程系, 北京 100084
胡宏昌	清华大学水利水电工程系, 北京 100084
刘亚平	首都师范大学资源环境与旅游学院, 北京 100048 首都师范大学城市环境过程与数字模拟国家重点实验室培育基地, 北京 100048	y.liu@cnu.edu.cn
赵思晗	清华大学水利水电工程系, 北京 100084

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.

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