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00woods Hole Group <br /> 4W <br /> Mar'f/teEll t:(forlrTlerltat SOILUOr1S <br /> 1 P.U. Box 10 • 1 140 :mute 28A <br /> tataumet,MA 02534 •USA <br /> Phcne: 308.363.5030 <br /> FAX: 508.563-2229 <br /> c-rrialL•WHQr�upmnc+Lcom <br /> October 1, 1996 <br /> Mr. Jim Hanks <br /> Town of Mashpee <br /> 16 Great Neck Road <br /> Maahpe+e, Massachusetts 02649 <br /> Dear Mr. Hanks, <br /> Aubrey Consulting, Inc. (ACI) corzpltwted an analysis of flu'-' +:f*eels of proposed <br /> dredging on tidal flushing of the Pavpoves;iet Bay Estuary. Particular attention was <br /> directed toward deter.�ti:�ing the effects of dredging on tidal of of Mashpee <br /> River. Thiy letter report describes briefly t1zL procedures, results, and conclusions, of <br /> this study. <br /> Approach <br /> An existing two-d1:T:tt:Sl��r�-� hydrO;�Yi121iT12C t:lC�t7t'l Wi�� IL�L�iiet� to 5tllly the <br /> effects of several dredgir.b sceninos on tidal flushing. The model was initially <br /> developed and ca'.ibrsttrrd for the Popponesset Bay Fstuary by ACS; detailed <br /> d=.ir.lentaiiU:ti for thE: model r�;as provided in Hyitracly. ariai=• ��tid ttcr �7:�,t�ftl/ <br /> 1vlocjctir:tg St"Iy of the Popp)() 3set Bay EsPu:zry, AIA (ACT, 1994). The existing <br /> model provided an ecL:ruOrnical means for the Town to inve_t,gate likely effects of <br /> propoc,cd dredging.• Improvements to the unodel for t1l tj stud) included: 1) adding a <br /> detailed ttivu-dil:let ion�,l description of Nfashpee River, is opposed to the previOUS, <br /> simplified of ie-dimensional scheme, and 2) updating depth ill:orm3{iotl in the <br /> lnlode,l based on the recent survey near the mouth of Popponesset Bay (BSC, 1996) <br /> and observations of shoals in the vicinity of Mashpee Piti•cr. These improvements <br /> effected slight changes in model predictions compared to the 1914 study. For <br /> instance, residence times in Mashpee River increased over previous estimates. The <br /> purpose of this study was to provide. data to help guide Town decisions regarding <br /> plans for future dredging;. <br /> The following five dredging scenar!m were modeled independently for <br /> Mashpee River, where degrading water quality is a concern, to identify a dredging <br /> scenario Incest likely tc) improt-e tidal flushing in this area. <br /> Scenario I- Thi,,; scenario rcrnovecl the expansive shoal extending from the <br /> rnvuth of 1�Iashpec River into Por pone!isc�t Bay, wiuci� has been observed by the <br /> WRVMWs_xoL <br /> AURANY <br /> 1": .� '� RO.770•CYIiJR`et.MA MIA�USAP.O,Ro•10•CjlauMC- ,jA 02534•USA Prorci SOa.563.0U0•(-M:508.963-2?�9 <br /> Phone,i09.469•DC1A•PAX:!f0 AAI.2220 e-mail:WHISLO—I.c01n <br /> I•mfll.CnIIACiQaohCJin <br />