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首页> 外文期刊>Canadian Water Resources Journal >Conceptual model of regional groundwater flow based on hydrogeochemistry (Monteregie Est, Quebec, Canada)
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Conceptual model of regional groundwater flow based on hydrogeochemistry (Monteregie Est, Quebec, Canada)

机译：基于水文地球化学的区域地下水流概念模型（加拿大魁北克省，蒙特雷吉埃斯特）

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摘要

The groundwater geochemistry of the fractured rock aquifer system in the Monteregie Est region, southern Quebec, Canada, was studied as part of a regional groundwater resources assessment. The 9218 km(2) study area included three major watersheds that were divided into five hydrogeological contexts: Northern St. Lawrence Lowlands, Southern St. Lawrence Lowlands, Appalachian Uplands, Appalachian Piedmont and Monteregian Hills. A large part of this study area was invaded by the Champlain Sea from 13,000 to 11,000 years ago. Study objectives were to identify the mechanisms controlling groundwater composition and to support the understanding of the aquifer hydrodynamics. Groundwater from 206 wells drilled into the rock aquifer was sampled and analyzed for conventional parameters and isotopic analyses were also done on selected samples (delta H-2, delta O-18 and H-3 of water; delta C-13 and C-14 of dissolved inorganic carbon). The interpretation of geochemical results was based on a multivariate statistical analysis, which led to the definition of eight water groups. The study allowed the delineation of a 2200-km(2) zone containing brackish groundwater of marine origin in the northwestern part of the study area. This zone is surrounded by sodic and alkaline groundwater originating from Na+-Ca2+ ionic exchange. Young groundwater and therefore recharge zones were only encountered in the southern part of the Lowlands, in the northern part of the Piedmont and in the Appalachian Uplands. In the southern part of Lowlands, recharge is presumed to be slow and water composition shows the influence of the former presence of the Champlain Sea. Relatively deep groundwater circulation was also inferred to occur from the Appalachian Uplands toward mixing zones mainly located to the west at the Appalachian frontal thrust faults and around the Monteregian Hills. The geochemical interpretation provided indications on regional recharge and discharge zones as well as groundwater flow, which could not have been determined otherwise.
机译：作为区域地下水资源评估的一部分，研究了加拿大魁北克省南部蒙特雷基东部地区裂隙含水层系统的地下水地球化学。 9218 km（2）的研究区域包括三个主要流域，分为三个水文地质背景：北圣劳伦斯低地，南圣劳伦斯低地，阿巴拉契亚高地，阿巴拉契亚皮埃蒙特和蒙特雷根山。从13,000到11,000年前，尚普兰海地区入侵了该研究区的很大一部分。研究目标是确定控制地下水组成的机制，并支持对含水层水动力的理解。对钻入含水层的206口井中的地下水进行了采样并分析了常规参数，并对选定的样品（水的δH-2，δO-18和H-3；δC-13和C-14）进行了同位素分析。溶解的无机碳）。地球化学结果的解释是基于多变量统计分析，从而得出了八个水组的定义。该研究允许在研究区域的西北部划定一个2200 km（2）的区域，其中包含海洋咸淡水。该区域被源自Na + -Ca2 +离子交换的苏打水和碱性地下水包围。年轻的地下水及其补给区仅在低地的南部，皮埃蒙特的北部和阿巴拉契亚高地遇到。在低地的南部，补给速度很慢，水的成分显示了尚普兰海以前存在的影响。从阿巴拉契亚高地向主要位于阿巴拉契亚前冲断层以西和蒙特雷吉亚山周围的混合带也发生了相对较深的地下水循环。地球化学解释提供了有关区域补给和排放区以及地下水流量的指示，否则无法确定。

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