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Amala Mahadevan (Woods Hole Oceanographic Institution)
Date & Time
Mon, 20 March 2023, 11:00 to 12:30
Chern Lecture Hall and Online

Coastal wetlands and seagrasses are valuable ecosystems that help mitigate climate change through the removal of carbon dioxide and offer resilience to coastal flooding. But these systems are under threat due to sea level rise. We examine two kinds of flow-driven instabilities that help to maintain wetlands and seagrass meadows. The formation of drainage channel networks in marshes is important for preventing water logging. With a model that couples flow and erosion in porous media, we identify the importance of faunal activity as one of the underlying causes for channel expansion. In submerged seagrasses, shear-driven instability leads to ‘monami’, synchronous waving of the submerged seagrass bed. A coupled multiphase model explains the phenomena and relates the rate of exchange across the seagrass canopy to the characteristics of the seagrasses and the flow.

Zoom link:
Meeting ID: 876 8033 0739
Passcode: 202022