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为分析降雨过程中δ18 O时程变化规律及其对径流划分的影响,分析了和睦桥流域2015年8月至2016年10月间七场降雨事件中林外降雨、穿透降雨、林外顺序降雨、穿透顺序降雨、河水的δ18 O变化规律,并利用二水源流量过程线分割模型,实时划分了径流成分。结果表明,林外降雨与穿透降雨的δ18 O均具有明显的时程变化,δ18 O时程变化导致径流划分所得旧水比例随时间的变化而变化;穿透降雨的δ18 O变化幅度小于林外降雨,但其δ18 O算术平均值和平均值整体上大于林外降雨,因此在进行径流成分划分时,需根据当地植被条件合理采样。研究结果为类似地区的径流划分提供借鉴。
In order to analyze the variation of δ18 O time-course and its impact on runoff division during precipitation, the precipitation, rainfall penetration, and out-of-forest sequence in the seven rainfall events of the Harmonic Bridge from August 2015 to October 2016 were analyzed Rainfall, Penetration Sequence Rainfall and δ18 O of river water were studied. The runoff fraction was divided into two parts by using the model of two-water source flow process line division. The results showed that there was a significant time-history change in both δ18O in rainstorm and through-rainfall, and the δ18O variation in penetrating rainfall was smaller than that in forest However, the arithmetic mean and average of δ18O are larger than the rainfall outside the forest as a whole. Therefore, it is necessary to rationally sample the runoff components according to the local vegetation conditions. The results provide reference for the runoff division in similar areas.