dsd-int 2014 - symposium 'water quality and ecological modelling' - large scale nutrient,...
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Symposium 'Water Quality and Ecological modellingTRANSCRIPT
L A R G E S C A L E N U T R I E N T , W E T L A N D V E G E T A T I O N A N D M O R P H O D Y N A M I C
M O D E L I N G O F T H E L O W E R M I S S I S S I P P I D E L T A A N D S U R R O U N D I N G
R E C E I V I N G B A S I N S
Ehab Meselhe1 and Johannes Smits2
1The Water Institute of the Gulf 2Deltares
Lower Breton
Mid-Breton
Lower Barataria
Mid-Barataria
Sediment Diversions
CRMS sites
Source: CRMS
P O T E N T I A L S E D I M E N T D I V E R S I O N S
Likely flow conditions: • ~35-75,000 CFS (~ 1,000-2,100 CMS)
P R O J E C T G O A L S
Gather field observations to improve understanding of the estuarine dynamics and to validate the numerical model
Produce a validated Ecological and Morphodynamic numerical model
Use the model to analyze the final array of restoration activities
M O D E L I N G A P P R O A C H
Hydrodynamics
Morphodynamics Nutrient Dynamics
Integration of Nutrient and Morphodynamic Modules to perform production runs
Vegetation
Delft3D-WAQ
M O D E L I N G A P P R O A C H D I A G R A M
Delft3D-FLOW
Nutr. Light Phytop. Org. Mat. Veg.
Veg. changes Fine sediment deposition Soil strength/surface drag
LAVegMod
EwE / CASM 5
Data Input: Atm, GOM, MR Data Input: Atm, GOM, MR
Chl. a
Water Column
Soil/Sediment Bed
Water depth Temperature Salinity Turbidity
Flow field Hydro. Morph. Susp. Sed.
Processes Processes
(sand, silt and clay)
E S S E N T I A L D E L F T 3 D M O D E L O U T P U T
6
Hydrodynamics (2D throughout estuary)
Water Quality Vegetation/Soils Sediment
Water-level Velocity Salinity Water temperature
Nitrogen (PON, DON, NH4, NO3) Phosphorus (POP, DOP, PO4) Silicate (SiO2) water column and soil layers separately
Chlorophyll a Dissolved Oxygen Suspended sediment – fines
Coverage of 7 species – distribution Above and below ground biomass
Suspended sediment – change in bed elevation due to accumulation or erosion % diversion sediment retained (estimated in post processing)
7
D ATA C O L L E C T I O N
Bathymetry and Elevation
Continuous
Splay Evolution
Estuarine Open Water
Wetland Soils and Vegetation
Sediment Diversion Initial Conditions
8
Bathymetry and Elevation
Continuous Deployment in Barataria and Breton:
• 10 YSIs (at Hydrological Water Quality Stations)
• 2 LISST (at Hydrodynamics/Sediment Transport/Ecological Stations (HSTE))
• 2 Aquadops (at HSTE Stations)
• 2 Meteorological stations (1 in each basin, at HSTE Stations 1,2)
9
Continuous
C O N T I N U O U S + T R A N S E C T S I T E S
10
Caernarvon Outfall and Big Mar Case Study
Splay Evolution
Data collection in Barataria and Breton basins along a salinity gradient (transect):
15 sites in Barataria Bay estuary
11 sites in Breton Sound estuary
Estuarine Open Water Parameters
During June and August 2014, at each site:
Secchi disk depth
Submerged Aquatic Vegetation (SAV, +/-); % cover
Water column profile (salinity, temperature, depth, pH, dissolved oxygen, chlorophyll a and turbidity with YSI EXO2 water quality sonde and suspended sediment with LISST)
Dissolved inorganic nutrients (NH4, NO2+NO3, PO4, SiO4, TN, TP)
Phytoplankton community composition (major groups, HABs)
Chlorophyll a
Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC)
Total Suspended Sediments (TSS)
Sediment TOC, % water content (4 slices: 1 cm, then every 5 cm)
Sediment Total Nutrients (TN, TP, TC, TFe)
Estuarine Open Water Sampling
12
E S T U A R I N E O P E N W A T E R T R A N S E C T
13
P H O T O S - B R E T O N A N D B A R ATA R I A
14
Data collection in Barataria and Breton basins:
Wetland Parameters
End of growing season 2014 (1 data collection trip per basin).
Followed CRMS protocol.
Soil porewater nutrients (NH4, NO2+NO3, PO4, TN, TP)
Soil porewater salinity
Vegetation aboveground biomass (live, dead), taxa, density, height; tissue TN/TP content; stem diameter; height
Vegetation belowground biomass (live, dead) and tissue TN/TP content
Soil organic matter (LOI) and bulk density
Soil TOC, TN, TP, TFe
Soil shear strength
Wetland Vegetation and Soil Sampling
15
W E T L A N D S A M P L I N G
16
S A M P L I N G W E T L A N D S V E G E TAT I O N A N D S O I L
17
A C K N O W L E D G E M E N T S - F U N D I N G
18
State of Louisiana Coastal and Protection Restoration Authority
A C K N O W L E D G E M E N T S - T E A M M E M B E R S
19
The Water Institute of the Gulf
Melissa Baustian
Ehab Meselhe
Mead Allison
Hoon Jung
Ashok Khadka
Leland Moss
Cyndhia Ramatchandirane
Dallon Weathers
Ann Hijuelos
Tim Carruthers
Denise Reed
Deltares
Johannes Smits
Valesca Harezlak
Bas Van Maren
Michel Jeuken
UL Lafayette Team Scott Duke-Sylvester Jenneke Visser LSU Team Samuel Bentley Kehui (Kevin) Xu
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