Sediment expert Dr. Rob Wheatcroft will visit Manzanita on Thursday, Nov. 9, to explain why the Nehalem River turns chocolate brown after storms and what this sediment transfer means for the local ecosystem.
Wheatcroft will examine how natural processes, such as variations in river flow and coastal uplift, as well as human-related processes, such as timber harvesting and land reclamation combine to influence the supply and accumulation of sediment and organic carbon in the Nehalem River system and other Oregon estuaries.
A professor in the College of Earth, Ocean, and Atmospheric Sciences at Oregon State University, Wheatcroft received a PhD in oceanography from the University of Washington in 1990, spent eight years at the Woods Hole Oceanographic Institution on Cape Cod and came to OSU in 1998.
Most recently, he is leading a team funded by Oregon Sea Grant to better understand the competing roles of relative sea-level rise and river sediment supply in the accumulation of sediment and carbon in Oregon estuaries throughout the past 300 years.
The free presentation, hosted by the Lower Nehalem Watershed Council, will start at 7:20 pm at Pine Grove Community House, 225 Laneda Avenue.
For more information, go to www.facebook.com/lnwc1.