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An evaluation of the effects of hot spring discharge on the Rio Grande in Big Bend National Park, Brewster County, Texas.

机译：评估德克萨斯州布鲁斯特县大弯国家公园温泉对格兰德河的影响。

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The Rio Grande forms the southern boundary of Big Bend National Park, and is the international boundary between the United States and Mexico. The natural condition of the river has been degraded significantly. Of particular significance is the current low flow status of the river, a condition that has generally existed since approximately 1996. Along the Rio Grande between Santa Elena Canyon and Rio Grande Village there are several thermal springs, which are thought to contribute to the total flow of the river. The purpose of this study was to assess the discharge and chemical contributions of thermal springs on the river system.; Observations were made at a particular hot spring on the eastern boundary of the park. During the study, field measurements and water samples were collected, which included discharge measurements and basic chemical evaluations of the spring and river. Water chemistry samples were taken at three locations relative to the hot spring: upstream, the hot spring itself, and downstream. The water chemistry data exhibit the expected mixing relationship with the downstream sample plotting as a mix of the upstream sample and the hot spring sample. The upstream sample shows a seasonal variation with the winter samples having higher Total Dissolved Solids (TDS) and the summer samples having lower TDS. This is due to the influx of dilute local precipitation during the wetter summer season. The hot springs showed a relatively constant TDS value throughout the study. This value falls between the winter high and summer lows of the upstream river sample. The implication of this is that the hot springs "improve" the water quality (lower the TDS) of the river only in the winter months.
机译：大里约热内卢形成了大弯国家公园的南部边界，是美国和墨西哥之间的国际边界。这条河的自然条件已大大恶化。尤为重要的是河流的当前低流量状态，这种状况自1996年左右以来就一直存在。在圣埃琳娜峡谷和里奥格兰德村之间的里奥格兰德河上有几个温泉，被认为对总流量有贡献。这条河。本研究的目的是评估温泉对河流系统的排放和化学贡献。在公园东部边界的一个特定温泉上进行了观测。在研究过程中，收集了田间测量和水样，其中包括流量测量和春季和河流的基本化学评估。在相对于温泉的三个位置采集水化学样品：上游，温泉本身和下游。水化学数据显示出与上游样品和温泉样品混合而成的与下游样品的预期混合关系。上游样品显示季节变化，冬季样品的总溶解固体（TDS）较高，夏季样品的TDS较低。这是由于夏季潮湿时稀有当地降水的涌入。在整个研究过程中，温泉显示出相对恒定的TDS值。该值介于上游河流样本的冬季最高和夏季最低之间。这意味着温泉仅在冬季才“改善”河流的水质（降低TDS）。

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