R. E. Randall Bauer Professor of Dredging Engineering Director, - - PowerPoint PPT Presentation

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Feb 18, 2023 265 likes •492 views

CDS R. E. Randall Bauer Professor of Dredging Engineering Director, Center for Dredging Studies Ocean Engineering/Department of Civil Engineering Texas A&M University CDS OVERVIEW Dredging Equipment Dredge Production Dredged

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R. E. Randall

Bauer Professor of Dredging Engineering Director, Center for Dredging Studies Ocean Engineering/Department of Civil Engineering Texas A&M University

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OVERVIEW

 Dredging Equipment  Dredge Production  Dredged Material Placement

 Open water  Confined (Upland)  Beneficial use

 Environmental Laws  Summary

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DREDGING EQUIPMENT

Dipper Clamshell Dragline Backhoe Bucket Bucket-Ladder Ladder MECHANICAL Hopper Sidecasting Plain Suction Cutterhead Bucket Wheel Dustpan Pipeline Agitation HYDRAULIC DREDGE

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HOPPER DREDGE

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HOPPER DREDGE

(GLDD LIBERTY ISLAND & MURDEN SPLIT HULL HOPPER DREDGE)

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MECHANICAL CLAMSHELL DREDGE

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PIPELINE DREDGES AND SLURRY TRANSPORT

 Typical pipeline diameters range

from 15 to 92 cm (6 to 36 in)

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Pipes are commonly constructed with steel or a composite material such as high density polyethylene

 Pipelines may be submerged,

floating, or placed on the shore.

 Floating pipelines may be

supported by pontoons or flotation material.

 Length of the pipelines varies

from short distances such as several hundred feet to several miles.

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CUTTER SUCTION DREDGE & CUTTERS

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AD ADVANCING NCING WITH FIXED WITH FIXED SPUDS SPUDS

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BOOSTER PUMP, UNLOADER, SPIDER BARGE

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PRODUCTION EQUATION

 CU YD/HR = GPM x AVE % SOLIDS x 0.297  CU YD/HR = D^2 x V x (SG-1) x 0.661  Example: 20 in (0.508 m) dredge, V=15.12 ft/s(14,805

GPM), SG=1.25 (Cv=0.2273 or 22.73 % solids by volume)

 P=GPM(Cv)(0.297)=14805(0.2273)(0.297)=999 cu yd/hr  P=D2(V)(SG-1)(0.661)=202(15.12)(1.25-1)(0.661)=999 cu yd/hr

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DREDGED MATERIAL PLACEMENT OPTIONS

 Open Water Placement  Confined Disposal Facility (CDF)  Beneficial Use

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OPEN WATER PLACEMENT

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CONCEPTIAL CONFINED PLACEMENT FACILITY

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50 YEAR PLAN FOR BENEFICIAL USE OF DREDGE MATERIAL (PORT OF HOUSTON, COURTESY OF D. CASEBEER) 50 YEAR PLAN FOR BENEFICIAL USE OF DREDGE MATERIAL (PORT OF HOUSTON, COURTESY OF D. CASEBEER)

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ATKINSON MARSH

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SEASONAL RESTRICTIONS ON DREDGING (DREDGING WINDOWS)

 The dredging window refers is that period during which

dredging activity is permitted

 Windows are placed on the dredging to protect a biological

resource from impact of the dredging activity

 Dredging windows

 Provide protection to the resources  Complicates scheduling of funding, contracting and conduct

f work

 Increases the costs due to constrained time period  Increases operational hazards if windows coincides with

adverse weather

 Causes inefficient use of the dredge fleet

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GULF INTRACOASTAL WATERWAY IN TEXAS

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DREDGING COSTS

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$0.00 $0.10 $0.20 $0.30 $0.40 $0.50 $0.60 $0.70 $0.80 $0.90 $1.00 $1.10 $1.20 $1.30 $1.40 $1.50 $1.60 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

Cost (Billion Dollars) Fiscal Year Actual Dredging Costs (1993‐2013)

$0.00 $0.50 $1.00 $1.50 $2.00 $2.50 $3.00 $3.50 $4.00 $4.50 $5.00 $5.50 $6.00 $6.50 $7.00 $7.50 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013

Average Cost ($/CY) Fiscal Year Average Dredging Cost/Cubic Yard

http://www.navigationdatacenter.us/dredge/dredge.htm

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SUMMARY

 Dredging is used to maintain and deepen ship channels, GIWW,

ports & harbors, other waterways.

 Dredging equipment includes: cutter suction, hopper, &

mechanical dredges, barges, pumps, instrumentation.

 Dredged material is placed in open water, confined (upland)

placement areas, and used beneficially.

 Dredging is used for the environmental clean up of rivers, lakes,

bays, and oceans.

 Environmental laws regulate dredging activities  Dredging windows protect certain marine life  Total US dredging costs $1.1 billion and average cost/cubic yard

was $5.81

 Texas GIWW requires ~ 11 million cubic yards of dredging

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QUESTIONS

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