The use of water stable isotopes for a better understanding of hydrogeological processes in Haiti: overview of existing δ18O and δ2H data

The use of water stable isotopes for a better understanding of hydrogeological processes in Haiti: overview of existing δ18O and δ2H data | Utilisation des données d’isotopes stables de l’eau pour une meilleure compréhension des processus hydrogéologiques à Haïti: présentation des données existantes de δ18O et δ2H El uso de isótopos estables del agua para comprender los procesos hidrogeológicos en Haití: descripción de los datos existentes de δ18O y δ2H 利用水稳定同位素更好理解海地的水文地质过程:现在δ18O 和δ2H 数据概述 Uso de isótopos estáveis da água para um melhor entendimento dos processos hidrogeológicos no Haiti: visão geral de dados de δ18O e δ2H existentes

2022

Isotope hydrological studies carried out since 1987 in Haiti have proven to be effective in improving conceptual models of the principal aquifers in this Caribbean island nation. However, many of these studies have been limited and are mostly unpublished. It is, therefore, important to share the available datasets with scientists and water managers to support further studies and guide decision-making. Eleven datasets were compiled in a unique database for continued advancement and application. This dataset now contains 248 δ¹⁸O and δ²H results from water samples collected at 190 locations throughout the country. δ¹⁸O and δ²H values range, respectively, from –3.8 to –8.95‰ and –67.4 to –16.8‰ for precipitation (n = 5), 0.9 to 2.76‰ and 8.8 to 18.4‰ for lakes (n = 4), –2.61 to 4.98‰ and –26.63 to 28.2‰ for rivers (n = 11), –5.11 to –2.6‰ and –29.8 to –6.9‰ for springs (n = 82) excluding hot springs, and –5.1 to –1.37‰ and –29.4 to –2.9‰ for boreholes (n = 142). The overall presentation of the available data is complemented with an overview of the studies in which stable isotope data acquisition was performed. The global dataset is presented under three primary contexts: (1) elaboration of a local isotope meteoric water line of equation δ²H = 7.2δ¹⁸O + 8.8 supported with data predominately from the Ouest jurisdictional department, (2) spatial variability analysis of the dataset, and (3) definition of the altitude gradient (per 100 m) using freshwater springs of the Plaine du Cul-de-Sac/Massif de la Selle area of –6.67‰ for δ²H and –0.09‰ for δ¹⁸O.

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