Accretion, Sediment Deposition and Suspended Sediment Dynamics in Mugu Lagoon, a Southern California Coastal Estuary PDF Download
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Author: Jordan Alexander Rosencranz
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Vertical accretion, the aggregation of material on a wetland surface, depends on organic matter accumulation and mineral sedimentation. We measured suspended sediment concentrations by total suspended solids (TSS), sediment deposition and vertical accretion rates in four marsh zones in the central basin of Mugu Lagoon, a salt marsh dominated by Salicornia pacifica. Mean TSS was 21±1 mg l-1 (Mean±SE) between February and May 2012, which is within the middle of the range of other salt marshes. Mean sediment deposition ranged from 0.00 g m-2 day-1 to 1.29 g m-2 day-1, which is in the low end of the range of other salt marshes. No net vertical accretion was observed between August 2011 and May 2012. Our results indicate that for high and high-mid marsh zones, sedimentation was highest adjacent to the creek. Interestingly, organic matter concentration in TSS varied with tide height, but mineral content did not. While more data are needed to confirm whether these trends occur over longer time periods, our study is one of the first to characterize spatial and temporal variation in sediment dynamics for a salt marsh dominated by Salicornia species.
Author: Jordan Alexander Rosencranz
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Vertical accretion, the aggregation of material on a wetland surface, depends on organic matter accumulation and mineral sedimentation. We measured suspended sediment concentrations by total suspended solids (TSS), sediment deposition and vertical accretion rates in four marsh zones in the central basin of Mugu Lagoon, a salt marsh dominated by Salicornia pacifica. Mean TSS was 21±1 mg l-1 (Mean±SE) between February and May 2012, which is within the middle of the range of other salt marshes. Mean sediment deposition ranged from 0.00 g m-2 day-1 to 1.29 g m-2 day-1, which is in the low end of the range of other salt marshes. No net vertical accretion was observed between August 2011 and May 2012. Our results indicate that for high and high-mid marsh zones, sedimentation was highest adjacent to the creek. Interestingly, organic matter concentration in TSS varied with tide height, but mineral content did not. While more data are needed to confirm whether these trends occur over longer time periods, our study is one of the first to characterize spatial and temporal variation in sediment dynamics for a salt marsh dominated by Salicornia species.
Author: Rowan A. Rowntree
Publisher:
ISBN:
Category : Bolinas Lagoon (Calif.)
Languages : en
Pages : 602
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Author: San Onofre Sediment Dynamics Group
Publisher:
ISBN:
Category : Nuclear power plants
Languages : en
Pages : 578
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Author: Lauren Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 240
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Coastal salt marsh ecosystems in California are at risk from projected rates of sea-level rise (SLR) of up to an order of magnitude higher than rates seen over the past 6,000 years of stable sea levels (Griggs, Cayan, Tebaldi, Fricker, & rvai, 2017). With rates of this magnitude, salt marsh area, already limited by land use changes in the 19th and 20th centuries, could be completely lost by 2100 (Thorne et al., 2018). To better understand how California salt marshes are adapting to modern acceleration of SLR, over 100 sediment cores were collected from 13 salt marsh sites, ranging from Humboldt Bay to Tijuana River Estuary. Sediment accretion rates over the past several hundred years were measured using radiocesium, radiolead, and radiocarbon dating on 32 cores. Valuation of the carbon storage, an ecosystem service known as blue carbon provided by salt marshes, presents an opportunity to help preserve and restore sites threatened by SLR through carbon credits (Bear, 2017; Callaway, Borgnis, Turner, & Milan, 2012; Mcleod et al., 2011), but there are many questions which much be addressed before this can become a reality for the state of California (Macreadie et al., 2019). A standardized protocol for estimation of carbon content from loss-on-ignition (LOI) was developed with an emphasis on quantifying error and uncertainty in carbon measurements for blue carbon purposes. Using a conversion between soil organic matter and soil organic carbon shown to be effective for California salt marshes, carbon content was estimated through LOI analysis of 61 sediment cores. The impact of climate change in these ecosystems was further explored in the first documented record of a fire in a Pacific coast salt marsh at Mugu Lagoon. California salt marsh sediment accretion averages at 2.93 1.9 mm yr-1, which is lower than average rates from regions such as the US Gulf and East coasts. Rates of accretion and relative SLR (RSLR) show a non-linear relationship with highest accretion occurring at rates of RSLR from 2 - 6 mm yr-1. Linear relationships between SLR and accretion are comparatively weak, but are stronger in the low elevations of salt marsh habitat. Salt marshes in the state annually sequester about 0.08% of state-wide annual greenhouse gas emissions and store about 23% of one year's emissions in their soils (as compared to 2016 emissions). Because of limited area, these habitats will not serve as an effective mitigation strategy at the state level, but loss of this habitat may release up to 27 0.3 Tg stored carbon, potentially valued at about $1.4 billion (using an estimate of $15/tonne CO2 equivalent). Preservation of current habitat through facilitation of sediment accretion will have the largest positive impact on carbon storage and sequestration, as well as protect salt marsh habitat from being lost to SLR. Analysis of the persistent effects of a recent marsh fire at Mugu Lagoon demonstrates that drought-stress may slow California salt marsh response to disturbance by one or more growing seasons and highlights the uncertain impacts of climate change on system function. This dissertation provides important baseline data for salt marsh sediment accretion, salt marsh carbon stocks and sequestrations rates, recommends best practices for use of LOI as a measure of soil organic carbon, and examines ecosystem recovery under multiple stressors. This work can be used in vulnerability assessments, ecosystem models, and valuation of ecosystem services for California salt marshes.
Author: David H. Peterson
Publisher:
ISBN:
Category : Suspended sediments
Languages : en
Pages : 74
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Author: Luis Gustavo Alvarez Sánchez
Publisher:
ISBN:
Category :
Languages : en
Pages : 350
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Author: Barry R. Hill
Publisher:
ISBN:
Category : Bed load
Languages : en
Pages : 36
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Author: Xiao Hua Wang
Publisher: Academic Press
ISBN: 0128119659
Category : Science
Languages : en
Pages : 162
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Book Description
Sediment Dynamics of Chinese Muddy Coasts and Estuaries: Physics, Biology and Their Interactions provides a forum for the latest research addressing the physics, sedimentary processes, biology, chemistry and ecological processes associated with these rapidly changing estuarine and coastal environments. The book explores the challenges and opportunities for future research in China's estuaries and coastal waters around the world, and uses China as a case study to provide answers to the causes of, and possible solutions to, these problems, presenting methodologies on working with observation and modelling analysis. China's coastal zone is facing many urgent issues in the environmental degradation and sustainable use of its marine resources. This book reviews and synthesizes papers from international research communities, including those from China, to exemplify and document their scientific approaches to manage and recover coastal ecological functions. - Presents spatio-temporal processes and multivariate dynamic modelling - Includes physical and biological feedback, along with marine ecosystem observation and modeling - Features multidisciplinary methodological approaches - Includes important information on the effects of climate change to the coasts and estuaries of China
Author: John R. Ritter
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 84
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Author: Stephen C Schroeter
Publisher:
ISBN:
Category : Marine ecology
Languages : en
Pages : 46
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