A Geochemical Study of Groundwater of the Yucatan Peninsula, Mexico

墨西哥尤卡坦半岛地下水地球化学研究

• 批准号: 9706203
• 负责人: Eugene Perry
• 金额: $ 1.41万
• 依托单位: Northern Illinois University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706203&HistoricalAwards=false
• 关键词: Geochemical; Study; Groundwater; Yucatan; Peninsula

9706203 Perry This is a proposal to study the complex but largely unconfined carbonate karst aquifer system of the northern Yucatan Peninsula, Mexico. Over much of its extent this aquifer system is extremely permeable with the result that a saline intrusion penetrates at least 100 km inland. The resulting dispersion zone produces important rock-water interaction and affects water quality in the overlying fresh water lens. A principal activity under this grant will be measure water levels (with respect to mean sea level) and seasonal water level changes throughout the northwest Yucatan Peninsula. These measurements are difficult because of the high permeability and extremely low water table gradients on the peninsula. At the time, they are necessary inputs to any meaningful aquifer models. Approximately six water level gages will be installed for long-term water level measurements. Water samples will be taken for radium, barium, and stable isotope analysis. Radium and barium analyses will lead to a better understanding of groundwater discharge into the Gulf of Mexico, and stable isotope measurements will help determine evapotranspiration. The ultimate objective of this work is to compile the information necessary for a complete water budget for the northern Yucatan Peninsula.

9706203佩里这是一项研究墨西哥尤卡坦半岛北部复杂但基本上无承压的碳酸盐岩溶含水层系统的提案。在其大部分范围内，这一含水层系统具有极强的渗透性，其结果是盐水入侵渗透到内陆至少100公里处。由此产生的弥散带产生了重要的岩石-水相互作用，并影响了上覆淡水透镜中的水质。这笔赠款下的一项主要活动将是测量整个尤卡坦半岛西北部的水位(相对于平均海平面)和季节性水位变化。由于半岛上的高渗透率和极低的地下水位梯度，这些测量是困难的。当时，它们是任何有意义的含水层模型的必要投入。将安装大约六个水位计，用于长期水位测量。将采集水样进行镭、钡和稳定同位素分析。镭和钡的分析将有助于更好地了解流入墨西哥湾的地下水排放情况，稳定的同位素测量将有助于确定蒸散量。这项工作的最终目标是汇编完成尤卡坦半岛北部水资源预算所需的信息。