Enhanced erodibility of deep-sea sediments by presence of calcium carbonate particles

Seo, Jun Young; Choi, Sun Min; Ha, Ho Kyung; Lee, Jun Young

doi:10.1007/s00367-020-00651-x

Cited by 8 publications

(7 citation statements)

References 75 publications

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“…Carbonate species were not directly measured, but CaCO 3 is known to form in the Susquehanna Flats on SAV in the summer under high pH and high dissolved oxygen (Su et al., 2020). Sediment with higher CaCO 3 content has higher (1–6 times) erosion rates than siliceous, carbonate‐free sediment (Seo et al., 2020), similar to the higher erodibility observed in the core from site SS3 over site SS2 (Figure 3).…”

Section: Resultssupporting

confidence: 71%

Relative Roles of Sediment Transport and Localized Erosion on Phosphorus Load in the Lower Susquehanna River and Its Mouth in the Chesapeake Bay, USA

Gray

Jaisi

2022

JGR Biogeosciences

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Sediments in rivers and lakes have increasingly become phosphorus (P) repositories in recent decades (e.g., Søndergaard et al., 2003). Under specific biogeochemical conditions, such as under high shear stress and low dissolved oxygen conditions, bed sediment P can diffuse up to surface waters, potentially stimulating algal blooms. Due to differences in external P loading, water body morphology, and physical and chemical characteristics of the sedimentary layer, the contribution of bed sediment to the total P load in the overlying water column can vary dramatically from 3% (3%-35% for 22 lakes; Nürnberg, 1984) to 80% (Larsen et al., 1981;Ryding & Forsberg, 1977). Internal loading in smaller lakes may exceed the input from external sources because shallow lakes are more sensitive to localized weather, such as rainfall and wind, and other biogeochemical processes conducive to releasing P from bed sediments (Somlyódy, 1983).Nutrient enrichment in the Chesapeake Bay can be traced back to the late 18th century after European colonization (Bratton et al., 2003). An abrupt decline in dissolved oxygen in the bottom water began between 1934 and 1948(Zimmerman & Canuel, 2000. This seasonal bottom water hypoxia is still present today, even after the implementation of nutrient TMDL mandates by the US Environmental Protection Agency for the past few decades. Point sources of nutrient pollution have decreased since 1992 but nonpoint (agricultural) sources have only marginally changed, with a 9% increase in P load most recently (Ator et al., 2019). The Susquehanna River delivers over one fourth of the P load and half of the freshwater supply to the Chesapeake Bay (Ator et al., 2019;Hargis, 1981). Because the sediment retention of the Conowingo Dam, the largest dam on the Susquehanna River,

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Section: Resultssupporting

confidence: 71%

Relative Roles of Sediment Transport and Localized Erosion on Phosphorus Load in the Lower Susquehanna River and Its Mouth in the Chesapeake Bay, USA

Gray

Jaisi

2022

JGR Biogeosciences

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“…A series of increasing τ b is applied to the surficial of the sediment core by controlling both the rotation rate of disk and the water pumping rate. A conceptual diagram and a photograph of the GEMS could be found in and Seo et al (2020). Sediment cores for erosion microcosm experiments were collected using an acrylic cylinder at the beginning and end of tidal emersion.…”

Section: Microcosm Experimentsmentioning

confidence: 99%

“…In this study, therefore, τ c0 was determined by the onset of type Ib. If the linear regression between the erosion variables (EM, erosion rate, and SSC) and τ b is divided into two parts by an inflection point, thereby transitioning from type Ib to type I/II (Seo et al, 2020). This partitioning of erosion type would be better suited for threshold estimation than no partitioning of this.…”

Section: Microcosm Experimentsmentioning

confidence: 99%

“…For example, τ c0 was defined as the τ b when an abrupt increase of SSC (>1.5 mg l −1 ) was first observed . Thus, there is a need to develop an accurate and objective method for determining τ c0 using the extrapolation method (Widdows et al, 2007;Seo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The τ c0 , a point of initial erosion of the bed, was estimated by three methods: (1) EM method: τ c0 was determined by an x-intercept of the regression of the eroded mass vs. τ b ; (2) ER method: τ c0 was determined, at background level of ER, through the linear regression of the time-averaged erosion rate vs. τ b ; and (3) SSC method: τ c0 was determined, at background level of SSC, through the linear regression of the time-averaged SSC vs. τ b . All the three have been used to compare the τ c0 from various erosion devices (e.g.,Neumeier et al, 2007;Widdows et al, 2007;Thompson et al, 2013;Seo et al, 2020) (Supplementary Table1). In case of the ER and SSC methods, using time-averaged erosion rate and SSC from each τ b , the linear regression was computed to remove the horizontal heterogeneity in τ b and erosion parameters(Schoellhamer et al, 2017).…”

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Comparison of Methods for Determining Erosion Threshold of Cohesive Sediments Using a Microcosm System

2021

Front. Mar. Sci.

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Erosion of cohesive sediments is a ubiquitous phenomenon in estuarine and intertidal environments. Several methods have been proposed to determine the surface erosion threshold (τc0), which are still debatable because of the numerous and uncertain definitions. Based on erosion microcosm experiments, we have compared three different methods using (1) eroded mass (EM), (2) erosion rate (ER), and (3) suspended sediment concentration (SSC), and suggested a suitable method for revealing the variation of erodibility in intertidal sediments. Erosion experiments using a microcosm system were carried out in the Muuido tidal flat, west coast of South Korea. The mean values of τc0 for three methods were: 0.20 ± 0.08 Pa (EM); 0.18 ± 0.07 Pa (ER); and (3) 0.17 ± 0.09 Pa (SSC). The SSC method yielded the lowest τc0, due to the outflow of suspended sediment from the erosion chamber of the microcosm. This was because SSC gradually decreased with time after depleting the erodible sediment at a given bed shear stress (τb). Therefore, the regression between SSC and applied τb might skew an x-intercept, resulting in the underestimation (or “not-determined”) of τc0. The EM method yielded robust and accurate (within the range of τb step at which erosion begins) results. The EM method represents how the erodible depth thickens as τb increases and therefore seems better suited than the SSC and ER methods for representing depth-limited erosion of cohesive sediments. Furthermore, this study identified the spatiotemporal variations of τc0 by EM method in an intertidal flat. The τc0 in mud flat was about two times higher than that in mixed flat. Compared to the end of tidal emersion, the sediment was 10–40% more erodible at the beginning stage.

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Research on benthic plume sedimentation characteristics and temperature effect in deep-sea nodule mining operation

Jin,

Chen,

Liu

et al. 2023

Marine Geology

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Enhanced erodibility of deep-sea sediments by presence of calcium carbonate particles

Cited by 8 publications

References 75 publications

Relative Roles of Sediment Transport and Localized Erosion on Phosphorus Load in the Lower Susquehanna River and Its Mouth in the Chesapeake Bay, USA

Relative Roles of Sediment Transport and Localized Erosion on Phosphorus Load in the Lower Susquehanna River and Its Mouth in the Chesapeake Bay, USA

Comparison of Methods for Determining Erosion Threshold of Cohesive Sediments Using a Microcosm System

Research on benthic plume sedimentation characteristics and temperature effect in deep-sea nodule mining operation

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