A Geochemical Study of Groundwater of the Yucatan Peninsula, Mexico

9706203佩里 这是一项研究墨西哥尤卡坦半岛北方复杂但大部分无压碳酸盐岩溶含水层系统的建议。 这一含水层系统在很大程度上具有极强的渗透性，因此盐水侵入至少深入内陆100公里。 由此产生的分散区产生重要的岩石-水相互作用，并影响上覆淡水透镜中的水质。 根据这项赠款的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）和季节水位变化。 由于半岛的渗透率很高，地下水位梯度极低，因此这些测量很困难。 目前，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地下水排入墨西哥湾的情况，稳定同位素的测量将有助于确定蒸散量。这项工作的最终目标是为北方尤卡坦半岛编制一份完整的水资源预算汇编必要的资料。

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.