Investigating the Seasonal Variations of Event, Recent, and Pre-Recent Runoff Components in a Pre-Alpine Catchment using Stable Isotopes and an Iterative Hydrograph Separation Approach

Simon Hoeg
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引用次数: 0

Abstract

An analysis of the runoff generation processes in terms of event, recent, and pre-recent runoff components is demonstrated for the Swiss pre-Alpine Alp catchment (46.4 km2) and two smaller tributaries (Erlenbach, 0.7 km2, and Vogelbach, 1.6 km2), whereas, recent water is understood as the contribution of the respective three prior rainfall-runoff events. A four-years time series of daily stable water isotope data in stream water and precipitation is used for the analysis of seasonal variations. In addition, high-frequency data (10 minutely intervals) are used for a detailed visualization of the rapid mobilization of recent water for single events. An iterative extension of the standard two-component hydrograph separation method is applied; this approach can be interpreted as a discretization of the catchment water and tracer mass balance along the event and pre-event time axis. Furthermore, the calculated event, recent, and pre-recent runoff components can be used to estimate time-varying backward travel time distributions.
利用稳定同位素和迭代水文图分离法研究阿尔卑斯山前流域事件、近期和前期径流成分的季节性变化
对瑞士阿尔卑斯山前集水区(46.4 平方公里)和两个较小的支流(埃伦巴赫,0.7 平方公里和沃格尔巴赫,1.6 平方公里)的径流生成过程进行了事件、近期和前期径流成分分析。溪水和降水中稳定水同位素数据的四年时间序列用于分析季节性变化。此外,还使用高频数据(10 分钟间隔)对单次事件中近期水的快速调动进行详细的可视化分析。对标准的双分量水文图分离法进行了迭代扩展;这种方法可解释为沿事件和事件前时间轴对流域水量和示踪剂质量平衡进行离散化。此外,计算出的事件、近期和前期径流成分可用于估算时变后向行程时间分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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