“Is Walden Okay?: Patterns of Phosphorous and Oxygen in the Pond"
Sunday, September 17, 3-4:30pm
John M. Nevison will talk about the effects of phosphorous and dissolved oxygen on Walden Pond. The interaction of these two elements is the root cause of modern toxic algae blooms such as those that have occurred on White Pond. This talk will demonstrate a simple dynamic model that ties together the data on these elements and illustrates the level of the current threats to the well-being of Walden Pond.
“How Walden Works: The Quiet Pattern of the Pond": A talk by John M. Nevison
Sunday, September 10, 3-4:30pm
As Henry David Thoreau visited and revisited Walden Pond, he often took time to observe the rising and the falling of the Pond's water level. How the Pond's level was tied to the fluctuations of the weather and to the structure of the underlying geology of the Pond remained a mystery.
