阿根廷西北部半干旱山区集水区水稳定同位素及水化学特征的时空变异

IF 1.5 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2025-07-30 DOI:10.1016/j.jsames.2025.105717

Marcos Macchioli-Grande , Gimena Uran , Mariano Larrovere , Cecilia Echegoyen , María Poca

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引用次数: 0

摘要

山区集水区是重要的水源。特别是在降水被潜在蒸散量超过的半干旱地区，山区集水区是居住在附近低地的人口的重要水库。本研究研究了位于阿根廷西北部安第斯山脉前陆的Pampeanas山脉的半干旱Huaco流域的水稳定同位素和水化学性质的时空变异。沿海拔梯度收集了四个子集水区的水样。结果表明，电导率和氯离子浓度在下游呈上升趋势（前者为148.1 ~ 307.2 μS cm−1，后者为17.7 ~ 46.4 ppm），而水稳定同位素组成（δ18O和δ2H）在整个海拔梯度上保持一致（平均值分别为- 5.1‰和- 24‰）。这些空间变化表明蒸发浓度随海拔高度的降低而增加，径流随海拔高度的降低而减少。此外，水被稀释（TDS高达175 mg L−1），呈碱性（pH = 8.2-8.5），并在下游从混合型碳酸氢钠转变为碳酸氢钠型。在2022年，主要离子表现出轻微的季节性变化。相反，水稳定同位素在时间尺度内保持不变。这表明地下水是供给水流的统一来源。此外，电导率和氯化物的浓度-流量关系表明，尽管流量发生变化，但溶质浓度的变化有限。这种综合同位素、水化学和水文测量方法提供了对半干旱山区流域水文动力学的见解，提高了对这些环境中水文过程的理解。

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Streamflow spatio-temporal variability of water stable isotopes and hydrochemical properties in a semiarid mountain catchment in Northwestern Argentina

Mountain catchments are critical sources of water. Particularly in semiarid regions, where precipitation is exceeded by potential evapotranspiration, mountain catchments are important water reservoirs for the population settled in the nearby lowlands. This study investigates the spatio-temporal variability of water stable isotopes and hydrochemical properties in the semiarid Huaco catchment, located in the Sierras Pampeanas of the Andean foreland in Northwestern Argentina. Stream water samples were collected across four sub-catchments along an altitudinal gradient. The results indicate that electrical conductivity and chloride concentrations increase downstream (from 148.1 to 307.2 μS cm⁻¹ for the former and from 17.7 to 46.4 ppm for the latter) while water stable isotopic composition (δ¹⁸O and δ²H) remain uniform across the altitudinal gradient (with averages of −5.1 ‰ and −24 ‰, respectively). These spatial variations are indicative of increasing evaporative concentration with decreasing altitude, also exhibiting decreasing streamflow with decreasing altitude. Moreover, water is diluted (with TDS up to 175 mg L⁻¹), alkaline (pH = 8.2–8.5), and transitions from bicarbonate-mixed to bicarbonate-sodium types downstream. Within the year 2022, major ions showed slight seasonal variation. Conversely, water stable isotopes remained constant within the temporal scale. This suggests groundwater as a uniform source feeding streamflow. Additionally, concentration-streamflow relationships of electrical conductivity and chloride suggest predominantly chemostatic behavior, highlighting limited variability in solute concentrations despite changes in streamflow. This integrative isotopic, hydrochemical, and hydrometric approach provides insights into the hydrological dynamics in this semiarid mountain catchment, improving the understanding of hydrological processes in these environments.

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.