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UID:24@sage.nelson.wisc.edu
DTSTART;TZID=America/Chicago:20250417T161500
DTEND;TZID=America/Chicago:20250417T171500
DTSTAMP:20250416T145917Z
URL:https://sage.nelson.wisc.edu/events/flows-with-living-roughness/
SUMMARY:Flows with Living Roughness
DESCRIPTION:Speaker:  Stephen Monismith\, professor of civil and environme
 ntal engineering\, Stanford University\n\n\n\nKelp forests\, seagrass beds
 \, and coral reefs are among the most productive\, bio-diverse\, and beaut
 iful of marine ecosystems. Hydrodynamics plays a central role in their fun
 ction\, controlling mass transfer between the organisms and the overlying 
 flow\, setting patterns and rates of transport of larvae\, and affecting t
 he extent to which the environment (temperature\, pH\, etc.) in these near
 shore systems are different from that of the adjacent ocean. Central to th
 is interplay of physics and ecology is the fact that the resistance to flo
 w provided by kelp plants\, seagrasses\, or corals is determined by the ge
 ometry and density of these “ecosystem architects”\, behavior that is 
 described by the dynamics of complex\, canopy flows.\n\nMonismith will pre
 sent field observations of these flows drawn from a coral reef in American
  Samoa\, a seagrass bed in Palau\, and kelp forests in Baja and offshore o
 f San Diego. In the first case\, drag can be related explicitly to the ree
 f geometry at cm scales. In the second case\, drag varies strongly with ve
 locity reflecting the re-configuration of the drag elements due to bending
 \, behavior that can be modeled with some accuracy. In the final case\, Mo
 nismith will first show velocity measurements taken over the span of sever
 al years during which time the condition of the kelp forest varied between
  non-existent and dense. During this time rms depth-averaged velocities va
 ried by a factor of 3\, showing the importance of kelp-dependent drag to f
 low. In general\, flows through kelp are substantially more complicated in
  that drag on flow through a kelp forest may be strongly influenced by kel
 p movement in the presence of surface waves\, has multiple drag sources\, 
 and involves substantial\, generally unresolved\, inhomogeneity in the dis
 tribution of the kelp plants themselves.\n\n*Note - This will be a virtual
  lecture.  Register for the Zoom link.*
CATEGORIES:Weston
LOCATION:https://uwmadison.zoom.us/meeting/register/odn0SPwmTVK5WZPWokxgWw
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