Distinguished International Lecturer in Geography.
The Geography Department is delighted to host Dr Stephen Tooth who will give a lecture on Wetlands in Drylands.
November 25th, Museum Building, Theatre M4, 1 pm (refreshments from 12.30).
Reserve your seat at : https://www.eventbrite.ie/e/lecture-wetlands-in-drylands-tickets-19173603765
This talk will address the apparent paradox of wetlands in drylands, focusing particularly on southern African wetlands that are maintained principally by river inflows (commonly termed riparian/riverine wetlands or floodplain wetlands). Using a range of case studies, I will illustrate how many channel and floodplain characteristics in these wetlands challenge established ‘textbook’ concepts of river behaviour. In detail, every wetland has a unique range of geomorphological and sedimentological characteristics but, at a general level, the dryland setting can be shown to impart some distinctive features. By comparison with humid region (tropical and temperate) wetlands, I will propose that many wetlands in drylands are characterized by: 1) more frequent and/or longer periods of desiccation; 2) channels that commonly decrease in size and even disappear downstream; 3) higher levels of chemical sedimentation; 4) more frequent fires that reduce the potential for thick organic accumulations and promote aeolian activity; and 5) longer timescales of development that may extend far back into the Pleistocene. Many gaps in knowledge remain, but I will demonstrate how improved understanding of the geomorphological and sedimentological factors influencing wetland development can help with the design of wetland conservation and remediation projects.
See Dr Tooth’s Publications Here