中文摘要：

以黄土高原丘陵沟壑区岔巴沟流域为研究对象,通过2005年6月、8月两次对地表水、地下水采样,分析δD、δ^18O、电导率（EC）和pH的变化,研究了岔巴沟流域的地表水—地下水转化关系.河水的氢氧同位素和EC沿河道变化大;主河道河水的δ值沿程富集,而EC在6月份时逐渐增加而8月份则先减小后增大;地下水δ值变幅较小而EC变化大.结果表明,旱季,河水接受以泉水为主要排泄形式的地下水补给,流量很小,在部分河段甚至干涸,仅在中游部分河段,由于河道两侧地下水位下降,基流或降雨径流对地下水形成一定的补给,但在其它河段没有明显的补给;雨季,降雨径流的退水过程快,洪水补给地下水的时间短且局限在河道两侧,洪峰过后,地表径流源于基岩裂隙泉以及各支沟淤地坝拦蓄的降雨径流,中游河水接受基岩裂隙泉水及各支流的补给量增加,而下游支流及泉水流量小,对地表径流量的贡献小,地表水沿程经历强烈蒸发,仅河道附近的地下水接受河水补给.淤地坝减少地下水排泄,增加地下水的转化量以及淤积层、地表径流的矿化度,但尚未明显影响地下水水质.

英文摘要：

Loess Plateau is of great significance to the hydrology in the interactions between surface water and groundwater at loess Plateau, Gully Region, are important preconditions for water resources Yellow River Basin, and especially at the Hilly and evaluation and ecological restoration. For this aim, Chabagou Catchment in the Hilly and Gully study interactions between hydrochemistry. In Chabago the two by integrating hydrogen and Region was chosen to oxygen isotopes and u Catchment, precipitation, surface water and groundwater were observed and sampled systematically; two trips of instantaneous sampling, including surface water and groundwater, were performed in June and August of 2005, with electrical conductivity （EC） and pH values tested in situ. The isotopic compositions and EC of surface water varied greatly and had different trends along the stream. The isotopic compositions of surface runoff concentrated along the mainstream. EC increased in June, but in August, it decreased from upper to middle reaches and then increased at the lower reaches. Variation of isotopic compositions in groundwater was small while it was large for EC. According to the isotopic and hydrochemical information of instantaneous sampling, relationships between surface water and groundwater has been identified. In dry season, low and evaporates severely flow surface water is during flow. In recharged rainy season, groundwater adjacent to the mainstream or gullies can by contact spring in fractured bedrock, peak runoff recedes quickly and only get recharge during flood; when pea runoff recedes, surface runoff mainly gets recharge from spring water and surface water held up by silt arresters at the upper reaches; increasing recharge of contact springs and runoff in branches reduces EC of surface water at the middle reaches; while at the lower reaches, recharge from spring and branches decreases mainstream. No matter in dry season or in and surface water gets severe evaporation along the rainy season when peak runoff recedes, surface