Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

The 47 Lake Regions of Florida and the six total phosphorus and five total nitrogen zones developed from those regions, provide a spatial framework for lake water quality management. Among 44 of the regions, median lake water and shallow groundwater chemistries were positively and significantly correlated for pH (R² = 0.13), specific conductance (R² = 0.54), total alkalinity (R² = 0.21), sodium (R² = 0.62), chloride (R² = 0.63), calcium (R² = 0.36), magnesium (R² = 0.48), sulfate (R² = 0.12), TP (R² = 0.32), potassium (R² = 0.34) and silica (R² = 0.16). Median mainland (excluding the Keys) groundwater specific conductance values exceeded lake water values by a factor of 1.7 but ranged from 0.52 to 4.1 in the different regions. Groundwater (R² = 0.88) and lake water (R² = 0.86) temperatures were inversely correlated with latitude (warmer in south Florida than north Florida). Groundwater pH (R² = 0.63), total alkalinities (R² = 0.77), specific conductance (R² = 0.80), sodium (R² = 0.96), and chloride (R² = 0.97) also increased moving southward. Groundwater pH (R² = 0.38), alkalinity (R² = 0.52) and specific conductance (R² = 0.58) were inversely correlated with land elevation increases. The Lake Regions of Florida could, therefore, potentially serve as a spatial framework for shallow groundwater management.