Spatiotemporal patterns of pH related to streamflow variability, drought conditions, and bedrock lithology in acid sensitive streams within a humid, subtropical catchment: Mulberry River, Arkansas, USA

IF 4.7 2区 地球科学 Q1 WATER RESOURCES
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Abstract

Study region

Mulberry River, Arkansas, USA

Study focus

Low alkalinity streams within siliciclastic dominated catchments like the Mulberry River in the south-central United States experience episodic acidification. Since 2009, reaches of the Mulberry River have been classified as impaired due to low pH. We hypothesize that if pH time series patterns are similar among tributaries, external watershed factors like seasonal weather may be related to low stream pH. We investigated pH variability in the Mulberry River watershed including changepoint detection analysis. Patterns of pH and changepoints were compared with streamflow variability and drought conditions using Palmer Drought Severity Index (PDSI).

New hydrological insights for the region

Changes in pH were near synchronous and similar magnitude across the study area, despite observed increases in median tributary pH from east to west. From the comparison of pH time series and PDSI, low pH values tended to occur during more negative PDSI, i.e. drier periods. The specific mechanisms driving low pH variability remain elusive, but we infer low stream pH is influenced, in part, by seasonal weather variability leading to drier watershed conditions and lower pH. The spatial variability of median pH values from east to west, though, are more related to spatial variability in bedrock lithology. We hypothesize other acid-sensitive streams in the region likely share similar pH behavior and with low pH occurring during drier periods.
亚热带湿润集水区酸敏感溪流中 pH 值与溪流变化、干旱条件和基岩岩性的时空模式:美国阿肯色州桑树河
研究地区美国阿肯色州桑树河研究重点美国中南部桑树河等硅质岩为主的集水区内的低碱度河流会出现偶发性酸化。自 2009 年以来,桑树河的一些河段因 pH 值过低而被列为受损河段。我们假设,如果各支流的 pH 值时间序列模式相似,则流域外部因素(如季节性天气)可能与溪流 pH 值偏低有关。我们对桑树河流域的 pH 值变化进行了调查,包括变化点检测分析。尽管观察到中位支流 pH 值从东到西有所上升,但整个研究区域的 pH 值变化接近同步,且变化幅度相似。通过比较 pH 值时间序列和 PDSI,低 pH 值往往出现在 PDSI 为负值的时期,即较干旱的时期。驱动低 pH 值变化的具体机制仍然难以捉摸,但我们推断溪流低 pH 值部分是受季节性天气变化的影响,导致流域条件更干燥,pH 值更低。不过,pH 中值从东到西的空间变化与基岩岩性的空间变化关系更大。我们推测,该地区其他对酸度敏感的溪流可能也有类似的 pH 值变化,并且在较干旱时期会出现低 pH 值。
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来源期刊
Journal of Hydrology-Regional Studies
Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
6.70
自引率
8.50%
发文量
284
审稿时长
60 days
期刊介绍: Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.
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