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Early Assessment of a Early Assessment of a Two Inlet Two Inlet System System , , Chatham. MA Chatham. MA
Early Assessment of a Early Assessment of a Two Inlet Two Inlet SystemSystem, ,
Chatham. MAChatham. MA
Cape cod
ChathamChatham
NantucketNantucketMarthaMartha’’s Vineyards Vineyard
Cape CodCape Cod
Glacial Deposits(Pleistocene)
Coastal Deposition(Holocene)
50 km50 km
Figure 1. Net littoral drift (from E. Pendleton)
Figure 2. Historical changes in the Nauset Beach - Monomoy Barrier Beach System ( From: Geise, et al, 1988 Development,Characteristics and Effects of the New Chatham Harbor Inlet, Woods Hole Oceanographic Institution,Reproduction from E. Pendleton )
Nauset Beach CycleNauset Beach Cycle
19841984
Nauset InletNauset Inlet
Cape Cod BayCape Cod Bay
Nantucket SoundNantucket Sound
Pleasant BayPleasant Bay
Chatham Harbor
Chatham Harbor
Predicted Predicted BreakBreak
Actual Actual BreakBreak
PrePre--1987 Inlet1987 Inlet
LighthouseLighthouse
““OldOld”” ChathamChathamBars InletBars Inlet
1987 Nauset Beach Break1987 Nauset Beach Break
Approx 4000 ftApprox 4000 ft.
January 13, 2006January 13, 2006
MinisterMinister’’s Points PointNorth Village (12 “camps”)
South Village (10 “camps”)
Pleasant BayPleasant Bay
September 26, 2006September 26, 2006
7 Months before 7 Months before ““breachbreach””
““Patriots DayPatriots Day””StormStorm
April 2007April 2007
April 20, 2007April 20, 2007 April 23, 2007April 23, 2007
June 18, 2007June 18, 2007 August 29, 2007August 29, 2007
April 23, 2007April 23, 2007
August 29, 2007
““MungMung””
August 2007
Incoming Incoming ““floodflood”” tidetide
““MungMung””
August 2007
October 31, 2007October 31, 2007
July 10, 2008July 10, 2008
2000+ ft.2000+ ft.7 Camps lost7 Camps lost5 Relocated5 Relocated
September 26, 2006September 26, 2006
January 14, 2008January 14, 2008
16 months later16 months later……
January 18, 2008January 18, 2008
July 2008July 2008June 2007June 2007June 2006June 2006 April 2009April 2009
Mean High
Mean Low
July 10, 2008July 10, 2008
May 2009May 2009
March 2008March 2008 July 2008July 2008
October 2008October 2008 February 2009February 2009
TwoTwo--channel Inletchannel Inlet
Single Channel InletSingle Channel Inlet
Flood TideFlood Tide
Ebb TideEbb Tide
April 25, 2008April 25, 2008
“Big” Pleasant Bay
“Little” Pleasant Bay
April 10, 2009
April 10, 2009
Photo Courtesy of Paul LaggPhoto Courtesy of Paul Lagg
Special ThanksSpecial Thanks::•• Graham GieseGraham Giese-- Center for Coastal StudiesCenter for Coastal Studies•• John Ramsey & Sean KelleyJohn Ramsey & Sean Kelley-- Applied Coastal ResearchApplied Coastal Research•• Spencer KennardSpencer Kennard-- KelseyKelsey--Kennard AirviewsKennard Airviews•• Paul LaggPaul Lagg-- Town of ChathamTown of Chatham
New Inlet SummaryNew Inlet Summary________________________________________
•• Continued development and Continued development and ““maturingmaturing”” of inletof inlet•• Change in tidal flowChange in tidal flow
–– New inlet better connected to Chatham HarborNew inlet better connected to Chatham Harbor•• Large sediment intrusion into estuaryLarge sediment intrusion into estuary•• Likelihood of increased (storm) flood potentialLikelihood of increased (storm) flood potential•• No obvious changes to Chatham InletNo obvious changes to Chatham Inlet•• No significant mainland erosionNo significant mainland erosion•• No severe navigation impactsNo severe navigation impacts
July 6, 2009July 6, 2009
Late Season NorLate Season Nor’’eastereasterJune 26, 2009June 26, 2009
18931893 19171917
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