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Monitoring the Coastal Processes in the Vicinity of Little Lagoon Pass
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Monitoring the Coastal Processes in the Vicinity of Little Lagoon Pass

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This presentation was given to the ALDOT Research Advisory Committee on July 2, 2012 in consideration for funding a two-year monitoring project at Little Lagoon Pass, Alabama.

This presentation was given to the ALDOT Research Advisory Committee on July 2, 2012 in consideration for funding a two-year monitoring project at Little Lagoon Pass, Alabama.

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Monitoring the Coastal Processes in the Vicinity of Little Lagoon Pass Monitoring the Coastal Processes in the Vicinity of Little Lagoon Pass Presentation Transcript

  • Monitoring theCoastal Processesin the Vicinity ofLittle Lagoon PassA Presentation and Proposal to the Alabama Department of Transportation’s Research Advisory Committee Scott L. Douglass, PhD, PE, DCE & Bret M. Webb, PhD University of South Alabama Department of Civil Engineering
  • Monitoring the Coastal Processes of Little Lagoon Pass OutlinePresentation Outline• Overview• History & Motivation• Relevance• Monitoring Plan• Modeling Analysis• Summary & ConclusionsUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass OverviewOverview• Located in Gulf Shores, AL $%&&%&&%% !"!#!$!• 2480-acre coastal lake $480-9 #,-./012345167 (")*%+!• 1 of 5 fresh water coastal lakes 3 /0%12 ,-. #0-4A0 91<,B4-,2C!& > +,5:;012%<-,1.• Supports abundant marine life 9=.0.42,<< ?5-@2&;4=9< (4=62$4=>,1 !"#$%&$%()*+& 9./,:0;0<= 4 8 54 64 74 ! and wildlife "066-92",>441• Constricted tidal connection ?5-@2&;4=9< !"#$%&$%()*+& 4 4?8 5 6 7 9./,:0;0<= > !• Major impacts by Hurricanes Frederick (79) and Ivan (04)University of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass HistoryHistory & Motivation• Tidal inlet moved naturally• Extension of West Beach Blvd. necessitated stable inlet• Tidal inlet “fixed” in place in 1980 with jetties• Significant blockage of littoral drift negatively impacts downdrift (west) shorelineUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass HistoryHistory & Motivation• Series of modifications to jetties exacerbates littoral blockage• 1991, ALDOT shortens jetties (court ruling)• Natural sand bypassing of jetties is reestablished• Required dredging frequency increases (> 90 sq.ft.)• $10M in 1990sUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass MotivationHistory & Motivation• To date, there has been no specific annual monitoring of the ebb/ flood tidal shoals and littoral processes at the pass (ruling)• Any modification to the jetties will impact coastal processes• An appropriate monitoring plan and subsequent analysis will provide the technical justification for ALDOT to defend itself against future litigationUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass RelevanceRelevance• ALDOT has unnecessarily spent millions of dollars on litigation• Proposed monitoring and analysis will: ‣ document response of shorelines to jetty modifications ‣ provide ALDOT with defensible technical justification ‣ save ALDOT and AL taxpayer millions of $ in future legal expensesUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass MonitoringMonitoring Plan• 3x per year plus one post-storm event survey• Will document and describe changes to beaches, ebb/flood tidal shoals, and littoral system through... ‣ Cross-shore beach profile surveying (land and water) ‣ Surveying of ebb tidal shoal ! ‣ Surveying of flood tidal shoalUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass MonitoringMonitoring Plan• ~2 miles on east/west of pass !• Spacing of transects more dense near pass, less dense with increasing distance from pass• Surveys of ebb/flood tidal shoals• Along-channel surveys• Comprehensive water quality mapping of the lagoon for graduate studies (no cost)University of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass ModelingModeling Analysis• Application of physics- and process- based numerical models to evaluate impacts of jetty modifications• Pre- and post-project evaluations (alternatives)• Will use surveyed bathymetry• USACE Coastal Modeling System ‣ Tides, Waves, & Currents ‣ Sediment Transport ‣ Structures ‣ Inlet Processes ‣ Morphologic ChangesUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb
  • Monitoring the Coastal Processes of Little Lagoon Pass SummarySummary & Conclusions• ALDOT has unnecessarily spent !"#$%&()*+,*((&-(*.%%%/0+12$34%5)%%%678$9%(:;(<;()%%%=">$%&%0?%&( IN THE UNITED STATES DISTRICT COURT FOR THE SOUTHERN DISTRICT OF ALABAMA SOUTHERN DIVISION $millions on Little Lagoon Pass LITTLE LAGOON PRESERVATION : SOCIETY, INC., : : Plaintiff, : : v. : CIVIL ACTION 06-0120-M : litigation UNITED STATES ARMY CORPS : OF ENGINEERS, et al., : : Defendants. : MEMORANDUM OPINION AND ORDER This action comes before the Court on Defendants’ Motion to• ALDOT does not have any Dismiss (Docs. 17-18). The parties filed written consent and this action has been referred to the undersigned Magistrate Judge to conduct all proceedings and order the entry of judgment in accordance with 28 U.S.C. § 636(c) and Fed.R.Civ.P. 73 (see Doc. technical justification to defend 26). After consideration, Defendants’ motion is GRANTED. The facts of this case, very briefly, are as follows. On May 8, 2000,1 the predecessor to Sea Mist, Inc. (hereinafter Sea 2 Mist) applied to the Defendant U.S. Army Corps of Engineers t h e m s e l ve s a g a i n s t f u t u r e (hereinafter Corps) and the State of Alabama under Section 404 of litigation 1 Though the application is dated February 8, 2000, it was not signed until May 8, 2000 (Doc. 27, Exhibit A). 2 Sea Mist is not a party to this action.• The proposed monitoring plan and modeling analysis will save ALDOT and the AL taxpayer $millions moreUniversity of South Alabama bwebb@usouthal.eduDepartment of Civil Engineering http://usacoe.org/bwebb