Hydrostratigraphy and hydrogeochemistry of the Vale of Eden, Cumbria, UK
Hydrostratigraphy and hydrogeochemistry of the Vale of Eden, Cumbria, UK
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英国坎布里亚伊甸谷的水文地层学和水文地球化学
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
C. Milne
中科院分区：
文献类型：
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作者：
P. Younger;C. Milne
通过对现有岩石地层资料的评价，确定了坎布里亚伊甸谷水文地层单元的性质和范围。彭里斯和圣比斯砂岩是最重要的含水层；漂移地质强烈影响补给过程。从现有的压力测量数据可以明显看出区域补给和排放区域；河谷地下水的主要排泄源是伊甸河及其支流。河谷地下水水质总体较好，属于ca - hco3相。Eden页岩附近有局部ca - so4相倾向，但盐度不高。一般来说，硝酸盐含量较低，但至少在彭里斯砂岩的一个浅层无约束部分，硝酸盐含量呈上升趋势。Penrith砂岩水域的缓冲作用很差，在某些情况下，pH值低于5.5。据认为，这可能是由于局部氨肥的硝化作用，在砂岩是无限制的。淡水河谷的地下水中主要的碳酸盐矿物是不饱和的，但二氧化硅（无定形或石英）是饱和的，赤铁矿是大量过饱和的。这表明彭里斯砂岩的典型胶结物今天可能仍在沉淀。进一步研究的重点包括圈定含水层几何形状和加强水化学监测。
SUMMARY The nature and extent of the hydrostratigraphic units in the Vale of Eden, Cumbria, has been established by an appraisal of existing lithostratigraphical information. The Penrith and St Bees sandstones are the most important aquifiers; drift geology strongly influences recharge processes. Regional recharge and discharge areas are apparent from existing piezometric data; the principal drain for groundwater in the Vale is the River Eden and its tributaries. The quality of groundwater in the Vale is generally good, and conforms to Ca–HCO 3 facies. Local trends towards Ca–SO 4 facies are found adjacent to the Eden Shales, but salinities are not excessive. Nitrates are generally low, but in at least one shallow unconfined portion of the Penrith Sandstones, a rising trend is discernible. The Penrith Sandstone waters are poorly buffered, and in some cases, pH is below 5.5. It is considered that this may locally be due to nitrification of ammoniacal fertilizers where the sandstone is unconfined. Groundwaters in the Vale are undersaturated with respect to the major carbonate minerals, but saturated with respect to silica (amorphous or as quartz) and massively super-saturated with respect to hematite. This suggests that the characteristic cements of the Penrith Sandstone may still be precipitating today. Priorities for further research include delineation of aquifer geometry and intensified hydrochemical monitoring.