contains process diurnal marine tidal flow zone This class aligns to the Coastal and Marine Ecological Classification Standard (CMECS). In ENVO, we may adapt the definition for consistency, but the semantics (meaning) of the term should be unaffected. In this case, the definition aligns with ENVO's "environmental zone" semantics. Alternate classes have been created to accommodate the process of diurnal tidal flow. The as the frequency of the process does not influence the semantics of the resulting hydroform, please use ENVO_01001336 to reference the hydroform rather than the zone or the process. Please consult the CMECS catalogue (https://cmecscatalog.org/) for authoritative and semantically unconstrained definitions. diurnal tidal flow CMECS:664 A marine zone in which ocean waters undergo a diurnal (once per day) tidal oscillation - with one high and one low tide per day - due to the supression of a second daily oscillation by the geometry of the ocean basin and obstructions presented by land masses. https://cmecscatalog.org/cmecs/classification/unit/664.html envoCmecs envoMarine diurnal marine tidal flow process marine tidal flow zone