Quantifying relative contributions of source waters from a subalpine wetland to downstream water bodies,Hydrological Processes

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Quantifying relative contributions of source waters from a subalpine wetland to downstream water bodies
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-08-12 , DOI: 10.1002/hyp.14679
J. M. Hathaway ₁ , C. J. Westbrook ₂ , R. C. Rooney ₃ , R. M. Petrone ₁ , L. E. Langs _{1,

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Affiliation

Subalpine regions of the Canadian Rocky Mountains are expected to experience continued changes in hydrometeorological processes due to anthropogenically mediated climate warming. As a result, fresh water supplies are at risk as snowmelt periods occur earlier in the year, and glaciers contribute less annual meltwater, resulting in longer growing seasons and greater reliance on rainfall to generate runoff. In such environments, wetlands are potentially important components that control runoff processes, but due to their location and harsh climates their hydrology is not well studied. We used stable water isotopes of hydrogen and oxygen (δ²H and δ¹⁸O), coupled with MixSIAR, a Bayesian mixing model, to understand relative source water contributions and mixing within Burstall Wetland, a subalpine wetland (1900 m a.s.l.), and the larger Burstall Valley. These results were combined with climate data from the Burstall Valley to understand hydrometeorological controls on Burstall Wetland source water dynamics over spatiotemporal timescales. Our results show that the seasonal isotopic patterns within Burstall Wetland reflect greater reliance on snowmelt in spring and rainfall in the peak and post-growing season periods. We found a substantial degree of mixing between precipitation (rain and snow) and stored waters in the landscape, especially during the pre-growing season. These findings suggest that longer growing seasons in subalpine snow-dominated landscapes put wetlands at risk of significant water loss and increased evaporation rates potentially leading to periods of reduced runoff during the peak- growing season and in extreme cases, wetland dry out.

中文翻译：

量化亚高山湿地源水对下游水体的相对贡献

由于人为介导的气候变暖，预计加拿大落基山脉的亚高山地区将经历水文气象过程的持续变化。因此，淡水供应面临风险，因为融雪期发生在一年中的早些时候，而冰川每年贡献的融水较少，导致生长季节更长，并且更多地依赖降雨来产生径流。在这样的环境中，湿地是控制径流过程的潜在重要组成部分，但由于它们的位置和恶劣的气候，它们的水文学没有得到很好的研究。我们使用氢和氧的稳定水同位素（δ ² H 和 δ ¹⁸O) 与贝叶斯混合模型 MixSIAR 相结合，以了解 Burstall 湿地、亚高山湿地（海拔 1900 米）和更大的 Burstall 谷内的相对水源贡献和混合。这些结果与来自 Burstall 山谷的气候数据相结合，以了解 Burstall 湿地源水动态在时空时间尺度上的水文气象控制。我们的研究结果表明，Burstall 湿地内的季节性同位素模式反映了对春季融雪以及生长旺季和生长后季节降雨的更大依赖。我们发现降水（雨和雪）和景观中的蓄水之间存在很大程度的混合，特别是在生长前的季节。

更新日期：2022-08-12

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