Under Construction
| The main goal of the project was to study the flow and
mixing of water in the tidal part of the Hudson River. This knowledge is
crucial for understanding the transport of dissolved substances, including
contaminants, in the river, as well as the propagation of perturbations
such as freshwater anomalies introduced by high precipitation events in
the watersheds feeding the Hudson. |
The method chosen for the study was to inject a
small amount of an inert gas into the Hudson close to Newburgh. This gas
was then tracked continuously to study the spreading and mixing of the
water tagged by the tracer. Injection of such a tracer is the closest
analogue to the introduction of a contaminant into the river. Tracking the
tracer patch allows us to directly visualize the spreading and mixing of
the water.  The upper Hudson... |
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 1 of 6 dams in the study. |
 Riverkeeper boat with submersible pump mount out. | ||
 Pump and gasser system. |
 SF6 Injection Equipment ---"Injection" means dissolving a certain amount of trace gas in the water (in our experiment at a depth of about 20 feet). | ||
 Entering lock #5 northbound. |
 More tress... | ||
 Residential areas... |
 Ted and Dave discussing experiment. | ||