Copper Creek Baseflow Age Experiment using Environmental Gas Tracers in the East River Watershed, CO

Groundwater contributions to streams, or baseflow, represents a mix of numerous flow paths through the subsurface of varying ages that are important to understanding system hydrologic lag and solute export. To better constrain numerical estimates of baseflow age, we used a novel experiment from Sanford et al. (2015) based on stream water concentrations of environmental gases (SF6, N2 and Ar) and an assumed Weibull distribution for a Colorado (CO) River headwater basin, Copper Creek (24 km2). The data package contains steam data collected over a 12-hour period on August 27, 2017 and the finite difference approximation for the mass balance approach.

溪流的地下水补给（即基流（baseflow））是诸多不同年龄地下流动路径的混合体，这对于理解水文系统滞后效应与溶质输出过程至关重要。为更精准地限定基流年龄的数值估算范围，我们采用了Sanford等人（2015）提出的全新实验方法，该方法基于溪流水中环境气体（六氟化硫（SF6）、氮气（N₂）、氩气（Ar））的浓度数据，并针对科罗拉多河河源流域铜溪（Copper Creek，流域面积24 km²）假设了威布尔（Weibull）分布。本数据包涵盖2017年8月27日为期12小时的溪流监测数据，以及质量平衡法的有限差分近似求解形式。