Evaluation of hydrograph separation techniques with uncertain end‐member composition
Evaluation of hydrograph separation techniques with uncertain end‐member composition
复制标题
端元成分不确定的过程过程分离技术评估
DOI：
10.1002/hyp.14693
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发表时间：
2022
影响因子：
3.2
通讯作者：
Brahney, Janice
中科院分区：
文献类型：
--
作者：
Lukens, Eileen;Neilson, Bethany T.;Williams, Kenneth H.;Brahney, Janice
水文线分离是用于分析偏远流域气候变化导致的源水对河流流量贡献的变化的许多方法之一。了解这些变化是至关重要的，因为水源水对河流的贡献的变化可以影响水管理决策。由于偏远流域通常无法进入，并且贡献水源或终端成员的特征很差，因此了解在这些数据有限的环境中使用不同的过程线分离技术的影响至关重要。为了探索与不同技术的不确定性，从两个水文分离技术，质量平衡和主成分分析，结果进行了比较，使用3年的含水地球化学数据从东河流域位于中部科罗拉多麋鹿山。端元的溶质浓度通过一组有限的不同来源的直接化学测量和详细的季节性瞬时化学来表征，以检查数据有限环境中不确定的端元组成的影响。在各种分离技术中，端元对气流的年度体积贡献具有相对较好的一致性。在过程线分离中观察到很大的时间变化，这取决于端元类型，并且估计的流量贡献在所选溶质之间变化。流化学表征的端元浓度显示出几个局限性，包括可区分的端元数量减少和流量贡献时间的差异。结果突出了使用多个过程线分离技术的好处，通过提供一个'证据权重'的方法，以有限的端元浓度数据的环境。
Hydrograph separation is one of many approaches used to analyse shifts in source water contributions to stream flow resulting from climate change in remote watersheds. Understanding these shifts is vital, as shifts in source water contributions to a stream can shape water management decisions. Because remote watersheds are often inaccessible and have poorly characterized contributing water sources, or end‐members, it is critical to understand the implications of using different hydrograph separation techniques in these data‐limited environments. To explore the uncertainty associated with different techniques, results from two hydrograph separation techniques, mass balance and principle component analysis, were compared using 3 years of aqueous geochemical data from the East River watershed located in the Elk Mountains of Central Colorado. Solute concentrations of the end‐members were characterized by both a limited set of direct chemical measurements of different sources and detailed seasonal instream chemistry to examine the influences of uncertain end‐member compositions in a data‐limited environment. Annual volumetric end‐member contributions to stream flow had relatively good agreement across separation techniques. Large variations in time were observed in the hydrograph separations, depending on the end‐member type, and estimated flow contributions varied between the selected solutes. End‐member concentrations characterized by stream chemistry showed several limitations including a reduced number of distinguishable end‐members and differences in timing of flow contributions. Results highlight the benefits of using multiple hydrograph separation techniques by providing a ‘weight‐of‐evidence’ approach to environments with limited end‐member concentration data.
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影响因子：
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