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Adaptive Management for Successful Marsh Restoration in Galveston West Bay

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Adaptive Management for Successful Marsh Restoration in Galveston West Bay ADAPTIVE MANAGEMENT FOR SUCCESSFUL MARSH RESTORATION IN GALVESTON WEST BAY Christian LaPann-Johannessen © 2015 HDR, Inc., all rights reserved. TEXAS LOUISIANA Houston Galveston TEXAS LOUISIANA Houston Galveston Galveston Entrance Channel Project Gulf of Mexico Location Galveston West Bay TEXAS LOUISIANA Houston Galveston Galveston Entrance Channel Bayside Project Gulf of Mexico Galveston Island Location Galveston West Bay State Park 8 Mile Rd Jamaica Beach MARSH LOSS ▪ Relative sea level rise ▪ Land subsidence ▪ Lack of sediment supply ▪ Wave induced erosion BAYSIDE N N 1955 2015 GALVESTON ISLAND STATE PARK N N 1954 1995 GISP: PHASE 1 RESTORATION ▪ Constructed in 1999 ▪ Terrace grid ▪ Geotube breakwater DELEHIDE COVE RESTORATION ▪ Constructed in 2003 ▪ Hydraulically dredged marsh mounds ▪ Geotube breakwater GISP: PHASE 2 RESTORATION ▪ Constructed in 2010 ▪ Hydraulically dredged marsh mounds ▪ Some coalescing mounds ▪ Sand ridge breakwater MARSH RESTORATION TECHNIQUES ▪ Create wide, gently sloped mounds from locally dredged material ▪ Overlap mounds to maximize plantable area ▪ Construct mounds to elevation suitable for marsh grass growth ▪ Construct rock breakwater to shelter restored marsh from wave impacts BAYSIDE ▪ 12 marsh mounds o 35,000 cy of dredged material ▪ 3,800 feet of rock breakwater o Shelters new and existing marsh ▪ Created 14 acres of marsh complex ▪ Construction o NTP: August 8, 2016 o Construction Status: Completed November 15, 2016 o Construction Cost: $2,338,000 N ~ 1 mile Marsh Restoration Borrow Area BAYSIDE BORROW AREA GISP ▪ 85 marsh mounds o 328,000 cy of dredged material ▪ 5,415 feet of rock breakwater o Shelters new and existing marsh ▪ Created 70 acres of marsh complex ▪ Construction o NTP: August 8, 2016 o Construction Status: Ongoing o Anticipated Completion: May 2017 o Construction Cost: $4,544,100 N N ~ 1 mile Borrow Area Marsh Restoration Borrow Area ~ 0.5 mile Marsh Restoration GISP BORROW AREA Marsh Restoration Construction Marsh Restoration Construction Marsh Restoration Construction PROJECT PARTNERS ▪ Galveston Island State Park o National Fish and Wildlife Foundation – Gulf Environmental Benefit Fund o NRG Energy, Inc. o Texas General Land Office o Texas Parks and Wildlife Department ▪ West Galveston Island Bayside o U.S. Fish and Wildlife Service – Coastal Impact Assistance Program o NRG Energy, Inc. o Texas Commission on Environment Quality – Galveston Bay Estuary Program o Texas General Land Office – Coastal Erosion Planning Response Act o Texas Parks and Wildlife Department Thank You © 2015 HDR, Inc., all rights reserved..
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