Predicting Redox Conditions in Groundwater at a Regional Scale.
Predicting Redox Conditions in Groundwater at a Regional Scale.
复制标题
预测区域范围内地下水的氧化还原条件。
DOI：
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发表时间：
2015
影响因子：
11.4
通讯作者：
D. Abrams
中科院分区：
文献类型：
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作者：
A. Tesoriero;S. Terziotti;D. Abrams
定义的氧化-亚氧化界面往往是至关重要的，以确定硝酸盐在地下水中的运输途径，并在当地规模的溪流。在区域尺度上定义这个界面是复杂的反应速率的空间变异性。在切萨皮克湾流域的含氧地下水的概率进行了预测有关的溶解O2浓度在地下水样品的停留时间和/或电子供体可用性的指标，使用逻辑回归。描述地表地质，在流动系统中的位置，和土壤排水的变量是重要的预测含氧水。预测了切萨皮克湾流域在30 m深度处遇到含氧地下水的概率和含氧层底部的深度。好氧层底部深度对溪流硝酸盐浓度和时间滞后的影响（即，土地施氮及其对河流的影响之间的时间段），说明了使用模型模拟假设盆地。含氧地下水的概率区域地图应证明是有用的地下水的敏感性和流的敏感性来自地下水的污染源的指标。
Defining the oxic-suboxic interface is often critical for determining pathways for nitrate transport in groundwater and to streams at the local scale. Defining this interface on a regional scale is complicated by the spatial variability of reaction rates. The probability of oxic groundwater in the Chesapeake Bay watershed was predicted by relating dissolved O2 concentrations in groundwater samples to indicators of residence time and/or electron donor availability using logistic regression. Variables that describe surficial geology, position in the flow system, and soil drainage were important predictors of oxic water. The probability of encountering oxic groundwater at a 30 m depth and the depth to the bottom of the oxic layer were predicted for the Chesapeake Bay watershed. The influence of depth to the bottom of the oxic layer on stream nitrate concentrations and time lags (i.e., time period between land application of nitrogen and its effect on streams) are illustrated using model simulations for hypothetical basins. Regional maps of the probability of oxic groundwater should prove useful as indicators of groundwater susceptibility and stream susceptibility to contaminant sources derived from groundwater.