Sediment Management for Coastal Restoration in Louisiana -Role of Mississippi and Atchafalaya Rivers
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1 Sediment Management for Coastal Restoration in Louisiana -Role of Mississippi and Atchafalaya Rivers Syed M. Khalil Louisiana Applied Coastal Engineering & Science (LACES) Division 9 th INTECOL International Wetlands Conference: Wetlands in a Complex World Orlando, FL June 8, 2012 committed to our coast committed to our coast
2 Delta Plain Degradation Wetland Loss In Coastal Louisiana ROLE OF RIVERS NAVIGATION, FLOOD CONTROL, ECOSYSTEM RESTORATION SEDIMENT OFFSHORE SEDIMENT SOURCES DEDICATED DREDGING FLUVIAL/RIVERINE SOURCES (RENEWABLE) SEDIMENT DIVERSIONS FEDERAL NAVIGATIONAL CHANNEL MAINTENANCE DREDGING DEDICATED DREDGING OF RIVERBED SEDIMENT DEDICATED DREDGING PLUS TRANSPORTATION BY PIPELINE SEDIMENT MANAGEMENT - LASMP
3 Major Deltas of the World
4 Delta Types by Dominant Processes (modified Galloway, 1975) Delta Characteristics = Fluvial vs. Receiving Basin Processes A River Dominated Wave Dominated B C Tide Dominated
5 ALLUVIAL VALLEY Components of a River-Delta System ALLUVIAL VALLEY
6 Importance of Receiving Basin in Delta System Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. WAXLAKE & ATCHAFALAYA DELTAS BIRD S FOOT DELTA
7 Regional Geological Framework 1. Sediment resources will depend upon the REGIONAL GEOLOGY which is a TYPICAL DELTAIC FRAMEWORK developed over 7000 years of geological history due to delta switching/avulsion 2. RESTORATION STRATEGIES should be based on understanding of process
8 Historic LMR Distributaries Flow Paths Historic distributaries delivered freshwater and sediment to the wetlands before the flood protection levees of the MR&T. Jakob Rosenweig, Tulane University
9 Contemporary Distributary Flow Paths Jakob Rosenweig, Tulane University
10 Historical and Predicted Land Loss
11 Sediment-Needed to Offset Land Loss Projected future land loss = 4,056-5,214 mi 2 / 10,500-13,500 km 2 (Blum & Roberts, 2009) Average annual land loss ( ) 12 sq. mi. (7,680 acre) Sediment needed 24.7 MCY Sediment needed (3.28 ft RSLR) = 16 BCY /12 BCM Land loss ( ) 210 sq. mi. (0.13 million acre) Sediment needed 433 MCY Land loss ( ) 1,883 sq. mi. (1.2 million acre) Sediment needed 3.9 BCY
12 Sediment Resources for Restoration Offshore Sand/Sediment Sources Buried Paleo-channels (sand bodies with silt/clay overburden) Ebb/Flood Deltas Sand Shoals (offshore shoals containing larger volumes) Fluvial/Riverine (Renewable) Sand/Sediment Sources Sand/Sediment transported to Gulf of Mexico Sand/Sediment (suspended & bed load) Sand/sediment dredged from federal navigational channel Sand/sediment via diversion
13 Offshore Sediment Distribution Map & Volume ~50 BCY (total) ~40 BCY (dredge-able) {Assumptions: Thickness = 10 feet From 10 feet isobath to nmi offshore} SURFICIAL SAND SURFICIAL MIXED SEDIMENT SURFICIAL FINES UNKNOWN
14 L M R Sediment Distribution & Volume Total Sand Volume: ~0.4 BCY / 0.3 BCM Dredge-able Sand Volume: ~0.37 BCY / 0.28 BCM
15 Mississippi River Sediment Delivery System Bayou Dupont (BA-39) Total Project Budget $31.6 million Acres Benefited 577 Construction Completion Date March 2011 Funding Program CWPPRA, ARRA
16 Long Distance Sediment Pipeline (BA-43) Currently Proposed LDSP Alignment Naomi Future LDSP Extension 1.5 Lafitte Lake Salvador The Pen BA-39 (II) (Built) 7.1 BA-41 (in construction) BA-48 BA-26 (Built) BA-27 (Built) BARATARIA LANDBRIDGE 24 BA-02 (Built) R2-BA-15 Candidate Little Lake R2-BA-12 Candidate BA-48 (II) Candidate 13.3 BA-36 (Built) 20.1 Myrtle Grove BA-39 (III) Candidate 9.0 BA-23 (Built) BA-39 (Built) 8.1 Turtle BayCoastal Volume of Sediment = 6.76 MCY Total Cost = $65.5 Million Total Marsh creation = 501 acre Total Ridge creation = 33,500 feet Cost per acre/ha = $130,816 Protection and Restoration Authority of Louisiana
17 Sediment Dredged from Federal Navigation Channels USACE 2010 Maintenance dredging program Maintenance Dredging = 91.4 MCY / 69.9 MCM Beneficial Use = 20.8 MCY / 15.9 MCM (23% OR 51%) Fluff = 15.7 MCY / 12 MCM Remote Sediment = 25.1 MCY / 19.2 MCM Suitable for Beneficial Use but disposed= 29.8 MCY / 22.8 MCM (Note: Sediment needed to offset one year land loss = ~25 MCY)
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21 Sediment Diversions Diversions replicate / re-establish deltaic processes by building land and transporting freshwater, sediment & nutrients. Building land via diversion is slow and episodic as compared to emplacement of dredged sediment to create wetland but saves energy. Study of fluvial sediment dynamics along with monitoring of existing diversions are important to understand the land building processes. River sediment dynamics/distribution have been altered by human activities in the past century. Diversions must be designed to optimize sediment transport than freshwater and be coupled to robust sediment management by dredging sediment from resultant downstream shoals. Determining the sediment budget is critical to the efficient use of diversions and beneficial use of sediment.
22 Mississippi and Atchafalaya Rivers Sediment Budget ( ) Proportion of suspended sediment at ORC differs from the 70:30 water split of Mississippi and Red River discharge due to the distinct Red River suspended sediment load. Sand is apportioned between the LMR and Atchafalaya pathways at a 83:17 ratio, and fines at a 60:40 ratio. An examination of water and suspended sediment ratios of individual water exits downriver of Belle Chasse indicates that there is a progressive downstream reduction in the efficiency of these channels in passing sediment. Allison et al. 2012
23 Diversions Important Questions Where to reconnect the River with the surrounding basins to get the most out of a diversion? What are the criteria for placement of diversions? How many reconnections or diversions are optimal and why? What are the pros and cons of large vs. small sediment diversions? What are the obstacles in implementing large diversions of river water and sediment? What are the requirements to maintain and initiate marsh growth vs. diversion characteristics? What do the recent river-derived sediment resource evaluations tell us about how much sediment could be used for diversions and what are the ramifications of using this resource?
24 LCA Delta Hydrodynamic and Delta Management Feasibility Study To develop a calibrated hydrodynamic and sediment management model to predict changes in depositional patterns across the system and inform dredging and sediment management A 5-year, $25M cost-share study between CPRA and USACE (MVD and MVN) Initial river hydrodynamic steps include River hydrodynamic and sediment transport data collection Geomorphic analysis One-dimensional river hydrodynamic and sediment modeling Multi-dimensional river hydrodynamic and sediment modeling Data management
25 Land-building Potential Atchafalaya and Wax Lake Deltas Wax Lake Outlet, which built a subaerial delta only after 31 years of subaqueous deposition in Atchafalaya Bay, but which now is continuing to gain land even following the 2005 and 2008 hurricanes (Barras 2009) Overall growth averaged 1 km 2 /yr (Allen et al. 2012) Estimates of 2008 flood deposition of sediment on the Atchafalaya delta of 4.09 Mt (Holm et al. 2009)
26 Studies in Atchafalaya Basin / River Atchafalaya Basin Sediment Management Plan (ABSMP) Delta Development and Coastal Marsh Accretion During Cold Front Passages and Floods: Relevance to River Diversion Wax Lake Delta Atchafalaya Delta
27 Atchafalaya Basin Sediment Management Plan Provide an understanding of the quantity, and quality of sediment load being delivered to and exiting the Atchafalaya Basin Describe how the Atchafalaya River can be managed to encourage sediment deposition in areas where sediment is needed, increase habitat continuity, and manage deltaic growth processes. Understanding the sediment dynamics and its management to incorporate in LMR Delta Management as it is the only place where sediment is accreting Deliverables 1. Inventory & catalogue of all the historical and current data 2. Sediment Budget 3. Sediment Management Plan
28 Average Annual Atchafalaya Basin Sediment Budget ( ) Storage Erosion
29 Atchafalaya Basin Sediment Management Plan Key Points Various options to increase sediment availability for coastal restoration are: Possible construction of third basin north of Morgan City Optimization or increase, of sediment load entering the Atchafalaya Basin at the Old River Control Structure Utilization of sediments deposited in Grand Lake, Big Bayou Pigeon, Bayou Darby, Murphy Lake etc. Sediment from Atchafalaya Basin can be used for various projects viz. river diversions, shoreline protection, marsh restoration, ridge restoration, and oyster barrier reef restoration, identified in Louisiana s 2012 Comprehensive Master Plan
30 Delta Development & Coastal Marsh Accretion during Cold Front Passages & Floods: Relevance to River Diversions This project provides quantitative linkages between forcing physical processes, sediment transport, and deposition in the present Mississippi- Atchafalaya Rivers system. Relevance to CPRA: It is designed to collect necessary data to help better understand sediment dynamics and sediment distribution in a system that is used to mimic what is to be expected from river diversions intended to offset coastal land loss.
31 Sediment Borrow Area Borrow Area Monitoring Infilling rate Slope Stability Issues Hypoxia Monitoring Programs BICM - Barrier Island Comprehensive Monitoring Program WAVCIS - Met-Oceanic Data Eustatic Sea Level Rise Subsidence Borrow Area Management Hypoxia Optimal Utilization Location vs. project/pipeline Location vs. Delineation of potential sand sources in OCS SEDIMENT RSM OCS Waters, State Waters, Coastal Zone Lower Mississippi & Atchafalaya River Sediment Evaluation Protocol of exploration Evaluation of potential areas Offshore/State & Federal Waters Lower Miss River Atchafalaya River LCA Miss River Delta Mgmt Study Atchafalaya Basin Sed Mgmt Plan Delta Development Study Sediment Data Management (LASARD) Protocol for standardization of data acquisition Sediment Management Sediment Resources Sediment Budget Diversions Sediment Dredged from Nav Channel Policy/ Regulation Federal Standard Environment Issues Prioritization of allocation Pipeline/O&G MMS NTL Sea Level Rise Policy Coordination with BOEM Permit (G&G, CR Issues); Lease for OCS sand; USACE IRSM; BUDMAT; GOMA GRSMMP; GRMMP LDNR/CMD CZM; Consistency Determination; Mitigation CWPPRA, LCA, & OTHER FEDERAL AGENCIES LOUISIANA SEDIMENT MANAGEMENT PLAN (LASMP)
32 Summary 1. Utilization of renewable fluvial sediment resources is critical for ecosystem restoration but for a cost effective, systematic, and sustainable ecosystem restoration of coastal LA, sediment management (LASMP) is crucial 2. Near Term land building: Dedicated dredging of sediment from borrow areas in the river (and offshore) as well as beneficial use of sediment dredged from federal navigation channels. 3. Long-term sustainability: Re-instating the natural sediment input to coastal LA via large diversions at appropriate places to mimic delta building processes. 4. A robust sediment management plan is critical for responsible management of limited sediment resources, and ABSMP provides for the first time a comprehensive Sediment Management Plan of a river basin vis-à-vis coastal restoration
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