Filters: Tags: Brackish Marsh (X)
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Accurate input data are important for making site-specific projections of tidal wetlands into the future. We developed bias-corrected digital elevation models (DEM) using the LEAN approach (LiDAR Elevation Adjustment with NDVI). LEAN DEMs were used as the initial elevation for model projections. Further, we conducted elevation and vegetation surveys across each study site to characterize elevation profiles of dominant species, which were used to inform organic productivity functions in WARMER-2.
This release consists of vegetation data collected across an environmental gradient at Ten Thousand Islands National Wildlife Refuge (TTI NWR) near Naples, Florida, USA. The refuge is within the impact area of the Picayune Strand Restoration Project (PSRP), a large-scale hydrologic restoration project in southwest Florida that was authorized by the U.S. Congress in 2007. Vegetation transects were located in the following wetland types on the refuge: brackish marsh, salt marsh, and transition marsh. Data from vegetation transects established in nearby areas outside of the PSRP impact area, in Fakahatchee Strand Preserve State Park (FSPSP) and Big Cypress National Preserve (BICY), are also included. The study spanned...
This dataset consists of raster geotiff outputs from modeling vertical accretion and carbon accumulation in the Nisqually River Delta, Washington, USA. These rasters represent projections of future habitat type, change in surface elevation above Mean Sea Level, and total sediment carbon accumulation since 2011 in coastal wetland habitats. Projections were generated in 20-year increments for 100 years for five amounts of sea-level rise, three amounts of suspended sediment concentrations, and two alternative configurations of the U.S. Interstate-5 causeway as it crosses the Nisqually River to either prevent or allow inland habitat migration (a total of 30 scenarios). The full methods and results are described in detail...
WARMER-2 Model Inputs and Projections for Three Tidal Wetland Sites Across San Francisco Bay Estuary
Understanding the rates and patterns of tidal wetland elevation changes relative to sea-level is essential for understanding the extent of potential wetland loss over the coming years. Using an enhanced and more flexible modeling framework of an ecosystem model (WARMER-2), we explored sea-level rise (SLR) impacts on wetland elevations and carbon sequestration rates through 2100 by considering plant community transitions, salinity effects on productivity, and changes in sediment availability. We incorporated local experimental results for plant productivity relative to inundation and salinity into a species transition model, as well as site-level estimates of organic matter decomposition. The revised modeling framework...
2010 Landsat TM satellite imagery was analyzed to develop the KIRA predicted relative abundance model. Three parameters were used in the model : (1) mean open water (MOW) at a 180 m scale, (2) mean spring normalized difference vegetation index (NVDI) at a 180 m scale, and (3) coefficient of variation (CV) of spring modified normailized difference water index (MNDWI) at a 1 km scale. Model output was divided into 5 quantiles for display purposes and to aid interpretation. King Rail inhabit marshes in the fresh-to-intermediate salinity range. Using the KIRA predicted relative abundance modeled parameters, the GCJV identified areas of brackish marsh that exhibited high quality vegetative structure within 1 km (approximate...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service;
Tags: King Rail,
biota,
brackish marsh,
environment,
predicted relative abundance
Habitat projections from the WARMER-2 model for four tidal wetland sites in San Francisco Bay estuary under the constant sediment scenario, plus 0.2 ppt per decade salinity scenario, and the community transition organic productivity function under a 99 cm by 2100 sea-level rise scenario. Results are the average from one hundred Monte Carlo simulations.
This data release consists of vegetation cover, soil surface elevation (also called vertical land motion of the wetland (VLMw)), and vertical accretion data collected over 23 months beginning in May 2001 in a restored brackish marsh in southeast Louisiana, USA. Vegetation cover was estimated in permanent plots, and soil cores were collected for determination of bulk density, organic matter content and texture. VLMw was measured using rod surface elevation tables, while accretion was measured using feldspar marker horizons (i.e., RSET-MH technique).
Categories: Data;
Tags: Barataria Basin,
Botany,
Geomorphology,
Louisiana,
USGS Science Data Catalog (SDC),
Saline tidal wetlands are important sites of carbon sequestration and produce negligible methane (CH4) emissions due to regular inundation with sulfate-rich seawater. Yet, widespread management of coastal hydrology has restricted vast areas of coastal wetlands to tidal exchange. These ecosystems often undergo impoundment and freshening, which in turn cause vegetation shifts like invasion by Phragmites, that affect ecosystem carbon balance. Understanding controls of carbon exchange in these understudied ecosystems is critical for informing climate consequences of blue carbon restoration and/or management interventions. Here we present measurements of net ecosystem exchange of carbon dioxide (CO2) and methane, along...
This dataset consists of raster geotiff outputs from modeling vertical accretion and carbon accumulation in the Nisqually River Delta, Washington, USA. These rasters represent projections of future habitat type, change in surface elevation above Mean Sea Level, and total sediment carbon accumulation since 2011 in coastal wetland habitats. Projections were generated in 20-year increments for 100 years for five amounts of sea-level rise, three amounts of suspended sediment concentrations, and two alternative configurations of the U.S. Interstate-5 causeway as it crosses the Nisqually River to either prevent or allow inland habitat migration (a total of 30 scenarios). The full methods and results are described in detail...
Vertical accretion and elevation change of marshes is a critical factor controlling marsh survival and adaptability to rising sea levels. A wide variety of existing methods have been employed to measure accretion and elevation change in marshes on time scales ranging from weeks to centuries on many individual marshes located throughout the coastal northeastern United States. This dataset is a compilation of marsh accretion and elevation change rates compiled from a total of 27 published studies and 3 data sets published from 1975 through 2021, yielding a total of 292 individual estimates of marsh accretion or elevation change. The database includes: measurements of marsh surface elevation change from repeat surveys...
Categories: Data;
Tags: Brackish Marsh,
Connecticut Coastal,
Freshwater Tidal Marsh,
High Salt Marsh,
Low and Intermediate Salt Marsh,
This dataset consists of raster geotiff outputs from modeling vertical accretion and carbon accumulation in the Nisqually River Delta, Washington, USA. These rasters represent projections of future habitat type, change in surface elevation above Mean Sea Level, and total sediment carbon accumulation since 2011 in coastal wetland habitats. Projections were generated in 20-year increments for 100 years for five amounts of sea-level rise, three amounts of suspended sediment concentrations, and two alternative configurations of the U.S. Interstate-5 causeway as it crosses the Nisqually River to either prevent or allow inland habitat migration (a total of 30 scenarios). The full methods and results are described in detail...
Projections of marsh elevation change with WARMER-2 across five regions of the San Francisco Bay Delta (Cache Yolo, South Delta, North Delta, Central Delta, and Suisun). The model was run across a range of initial elevations for each region and for scenarios of sea-level rise (30, 61, 91, 122, 152, 183, 305 cm by 2100), sediment availability (historic, constant, declining, and increase), and with and without a temporally dynamic tidal range. Results from the Delta Simulation Model 2 hydrodynamic model were used to calculate rates of tide range increase with sea-level rise. WARMER-2 was calibrated using soil cores from Callaway et al 2012 (Rush Ranch and Browns Island cores), and a soil core from Miners Slough. ...
Categories: Data;
Tags: Brackish Marsh,
Delta,
Emergent Tidal Marsh,
Freshwater Tidal Marsh,
San Francisco Bay,
These data represent net ecosystem exchange of CH4 and CO2 collected using eddy covariance over various time frames. Data were collected from a brackish marsh at Pointe-aux-Chenes State Wildlife Management Area and a tidally influenced freshwater marsh at Salvador State Wildlife Management Area. Both sites were located within the coastal zone of Louisiana, USA.
Description of condition index value scores for estuarine tidal marsh along and within 10 km of the GCPO LCC Gulf Coast subgeography. A series of raster calculations were used in a dichotomous decision-based framework to compile a per-pixel draft condition index value at a 10 m resolution for GCPO estuarine tidal marsh based on the number of configuration and condition endpoints met within each marsh pixel. Pixels not identified as a estuarine marsh but that were identified as having the potential to be marsh were given a score of 1, provided the pixels were not classified as developed. Potential estuarine tidal marsh pixels were derived from a combination of potential estuarine tidal marsh classes in the Landfire...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: BIOSPHERE,
BIOSPHERE,
BIOSPHERE,
BIOSPHERE,
BIOSPHERE,
A critical factor controlling marsh survival and adaptability to rising sea level is an adequate supply of sediment for supporting upward growth of marshes, yet sediment availability and the factors that control its delivery to marshes remain poorly constrained. This dataset includes the results of sediment trap deployments and accompanying water level recordings from 9 coastal salt marshes in the northeastern United States. Sediment traps were deployed seasonally, with individual spring, summer, and fall deployment periods over the course of 2020-2021. The distribution of study sites spans differences in tidal range, wave climate, sea surface temperature, and assemblages of marine organisms. Additionally, these...
Categories: Data;
Tags: Brackish Marsh,
Freshwater Tidal Marsh,
High Salt Marsh,
Low and Intermediate Salt Marsh,
Maine Coastal,
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