Subterranean estuaries (STEs), like open-water estuaries are zones of mixing between seawater and freshwater with a characteristic structure.Despite the diverse manifestations of STEs, the mixing processes have elements in common with open-water estuaries, which can serve as a basis for their OCTOPUS: operation control system for task optimization and job parallelization via a user-optimal scheduler classification.A typology for STEs might provide a road map for further distilling a working definition of STEs.By analogy with open-water estuaries, a typology for STEs might include characteristic physical drivers and processes, Unlocking the potential of game-based learning for soft skills development: A comprehensive review morphology, and biologically relevant parameters.I suggest that such a typology be based on salinity structure to include at a minimum the 1) coastal slope, 2) tidal range, 3) hydraulic conductivity, and 4) recharge.
Even a partially applicable definition permits classification, encourages comparisons and can provide a framework for management.