Flow partitioning modelling using high-resolution electrical conductivity data during variable flow conditions in a tropical montane catchment
Flow partitioning modelling using high-resolution electrical conductivity data during variable flow conditions in a tropical montane catchment
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在热带山地流域可变流量条件下使用高分辨率电导率数据进行流量分区建模
DOI：
10.1016/j.jhydrol.2022.128898
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发表时间：
2023
影响因子：
6.4
通讯作者：
Crespo, Patricio
中科院分区：
文献类型：
--
作者：
Lazo, Patricio X.;Mosquera, Giovanny M.;Cárdenas, Irene;Segura, Catalina;Crespo, Patricio
示踪剂辅助水文模型（TAHMs）是最强大的工具，以确定新的（事件）和旧的（事件前）的水部分，暴雨流量，因为它们占径流和示踪剂混合动力学模型校准。然而，由于无法获得高分辨率的保守示踪剂数据（例如，水稳定同位素或氯化物）。因此，需要识别替代示踪剂，其产生与“理想”示踪剂类似的流划分结果，同时需要较少的财政资源用于高频监测（例如，次小时）。在这里，我们比较流量分配结果的TAHM校准使用高频电导率（EC）和水稳定同位素（18 O）的数据收集在37 mall-runoff事件期间监测在Zhurucay生态水文观测站，位于厄瓜多尔南部的热带高山流域的可变水文气象条件。当使用稳定同位素的采样分辨率（6小时至1小时）对模型进行校准时，使用两种示踪剂进行模型校准的事件前水分分数（PEWF）没有统计学显著差异，89%的事件的两种示踪剂之间的PEWF差异< 20%，而不管事件的前期水分和降雨条件如何。模型传递函数也相似，这表明使用两种示踪剂推断的流域内部过程是可比的。出现较大差异的事件（n = 4; PEWF差异高达27%）在峰值流量期间没有收集样本。使用EC数据收集在亚小时的时间间隔（每5分钟）的模型的校准显示了显着增加的模型性能相比，收集同位素数据的频率。相似的流量分配结果可以归因于EC的准保守性质，由于存在富含有机物的河岸土壤（泥炭型）覆盖整个流域的致密基岩。调查结果还强调了捕获快速发生的流域混合过程的重要性，虽然高时间频率监测示踪剂数据。我们的研究鼓励评估使用替代示踪剂，如EC，以确定快速发生的径流过程的价值，同时降低实施和维持示踪剂数据收集所需的成本很长一段时间。
Tracer-aided hydrological models (TAHMs) are one of the most powerful tools to identify new (event) and old (pre-event) water fractions contributing to stormflow because they account both for streamflow and tracer mixing dynamics in model calibration. Nevertheless, their representativeness of hydrograph dynamics is often limited due to the unavailability of high-resolution conservative tracer data (e.g., water stable isotopes or chloride). Hence, there is a need to identify alternative tracers yielding similar flow partitioning results than “ideal” ones while requiring fewer financial resources for high-frequency monitoring (e.g., sub-hourly). Here, we compare flow partitioning results of a TAHM calibrated using high-frequency electrical conductivity (EC) and water stable isotope (18O) data collected during 37 rainfall-runoff events monitored during variable hydrometeorological conditions in the Zhurucay Ecohydrological Observatory, a tropical alpine catchment located in southern Ecuador. When the model was calibrated using the sampling resolution of stables isotopes (6-hours to 1-hour), no statistically significant differences of pre-event water fractions (PEWFs) using both tracers for model calibration were found. PEWF differences between both tracers for 89% of the events were < 20% regardless of the events’ antecedent moisture and rainfall conditions. Model transfer functions were also similar suggesting that catchment internal processes inferred using both tracers are comparable. Events presenting larger differences (n = 4; up to 27% PEWF difference) had no samples collected during peak flow. Calibration of the model using EC data collected at sub-hourly intervals (every 5-minutes) showed a significant increase in model performance as compared to the frequency of collection of isotopic data. Similarity in flow partitioning results can be attributed to a quasi-conservative nature of EC due to the presence of organic-rich riparian soils (peat-type) overlying compact bedrock across the catchment. Findings also highlight the importance of capturing rapidly occurring catchment mixing processes though high-temporal frequency monitoring of tracer data. Our study encourages the value of assessing the use of alternative tracers, such as EC, to identify fast occurring rainfall-runoff processes, while lowering the costs needed to implement and sustain tracer data collection for long time periods.
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影响因子：
6.3
作者：
J. Freyberg;B. Studer;J. Kirchner
通讯作者：
J. Freyberg;B. Studer;J. Kirchner
影响因子：
6.8
作者：
AKAIKE, H
通讯作者：
AKAIKE, H
使用环境同位素识别新西兰东部奥塔哥草丛草原流域的径流产生机制
DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
M. Bonell;A. Pearce;M. Stewart
通讯作者：
M. Stewart
结合使用同位素和水文测量数据来概念化高海拔热带生态系统中的生态水文过程
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
G. Mosquera;R. Célleri;P. Lazo;K. Vaché;S. Perakis;P. Crespo
通讯作者：
P. Crespo
用于水流测量的盐稀释测量简介第 2 部分：恒速注入
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
R. D. Moore
通讯作者：
R. D. Moore