Intermittently Closed/Open Lakes and Lagoons: Their global distribution and boundary conditions

• Published in: Geomorphology (Amsterdam, Netherlands) Vol. 292; pp. 142 - 152
• Main Authors: McSweeney, S.L., Kennedy, D.M., Rutherfurd, I.D., Stout, J.C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2017
• Subjects: Coastal lagoon; Estuary; Estuary distribution; ICOLL; ICOLL; Estuary; Estuary distribution; Coastal lagoon
• ISSN: 0169-555X; 1872-695X
• DOI: 10.1016/j.geomorph.2017.04.022

Intermittently Closed/Open Lakes and Lagoons (ICOLLs) are a particularly dynamic form of estuary characterised by periodic entrance closure to the ocean. Closure occurs when a subaerial sand berm stabilises across the entrance channel during times of low fluvial discharge. ICOLLs are of global importance as they provide valuable ecological habitats for many species and are associated with a wide range of management issues due to their cycle of entrance closure and opening. ICOLLs are found to be more widespread globally than previously described with 1477 of these estuaries being identified in this study. This constitutes an estimated 3% of the world's estuaries and 15% of all estuaries along microtidal coastlines. ICOLLs are concentrated along microtidal to low mesotidal coastlines in the mid-latitudes and predominantly on coasts with temperate climates. This distribution is related to greater wave heights as driven by high intensity winds and a longer fetch distance. The highest proportion of ICOLLs are present in Australia (21% all global ICOLLs), South Africa (16%) and Mexico (16%). In Australia, a comparison with fluvial input found that it is less important than marine processes in determining ICOLL formation and that ICOLLs are associated with a relative tidal range of <3.22. Additionally the majority of ICOLLS are small systems with catchments <2000km2 and tidal prisms <30×106m3, forming at the mouths of rivers with generally low mean annual and specific discharges.
•Intermittently Closed/Open Lakes and Lagoons (ICOLLs) are concentrated in the mid-latitudes globally.•They are found along micro- to low meso-tidal range coasts and in storm and swell wave environments.•1477 of these systems were observed worldwide which constitutes approximately 3% of the world's estuaries.•ICOLLs are most common on microtidal coastlines and constitute 15.30% of the world's microtidal coast estuaries.•In Australia, ICOLLs occur where RTR<3.22, RT/W<31, and have small tidal prisms (<30×106m3) and catchments (<2000km2).•Coastal processes appear to dominate over river hydrology in both the opening and closing of estuary mouths.