Subtidal flows in Sounds

   Three major sounds that provide large transports from the outer to the inner Casco Bay are the
Portland Channel, Hussey Sound and Broad Sound. Subtidal flows are shown for May 4-11,2005 which
covers the first northeaster of May.
   Level 1 is at the surface, and level 8 is at the bottom. These are the sigma-levels of the terrain
following depth levels in the Bay. Flows toward shore are represented by vectors above the axis.
 The vectors actually have different directions, but the scaling makes them all look like
they are either due north or due south.
   Portland Channel shows a net outflow at all depths during the northeaster.
   Hussey Sound shows the two-layered flow during the northeaster with netflow out at the surface and
reverse flow in along the bottom.
   Broad Sound shows a net inflow at every depth, especially during the northeaster.
    

	The non-tidal elevations show how water piles up in Portland Harbor during the two northeasters around May 7-10 and May 23-27, 2005.
	Speeds are in m/sec. Strong flow moves out of Portland Channel during the northeaster. The model results are shown at the same location as an adcp that was launched by Carol Janzen in 2004.
	Speeds are in m/sec. Subtidal flow is generally offshore in the upper layers, and minimal in the bottom layers except for the reverse flow into the inner Bay during the northeaster. The model results are shown at the same location as an adcp that was launched by Carol Janzen in 2004.
	Speeds are in m/sec. Broad Sound is the largest sound with the largest volume transports that can move offshore deeper water into the inner Bay. Subtidal flow here is inshore at all depths, and is increased during the northeaster. The model results are shown at the same location as an adcp that was launched by Carol Janzen in 2004.
	In October 20-27, 2004, there was another northeaster. Wind vectors at the top of the figure relate to the subtidal flows in the top 3 levels of Hussey Sound.