According to the Asharoke CDRM Draft Feasibility Report on page 3::

"Jetties by the Northport Basin located in the Long Island Power Authority (LIPA)
Northport Power Station have contributed to the long-term erosion problems west of the
west jetty, although coastal effects from Long Island Sound dominate the erosion
processes along the entire downdrift coastline. Since the original construction of the jetties in 1932, the shoreline just east of the jetties has experienced accretion, while the shores to the west and northwest (Asharoken Beach) have experienced continued erosion. Analysis of sediment transport around the effluent pipes and the jetties indicate that an effective littoral block is formed near the outfall. This littoral block effectively limits sediment movement from the east to west. The only sand that is currently being bypassed around the jetties is the inlet dredge material that is placed on the beach justwest of the west jetty as part of the power plant operation."