A summary report of sediment processes in Chesapeake Bay and watershed

Langland, Michael J.; Cronin, Thomas M.

doi:10.3133/wri034123

Cited by 11 publications

(1 citation statement)

References 88 publications

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“…The mean annual flow of the Susquehanna River at the Conowingo Dam over the last few decades is 1150.4 m 3 /s (Moyer & Blomquist, 2019). This flow contributes roughly 1.15 × 10 6 tons of sediment per year to the Bay (Langland & Cronin, 2003). Under normal conditions, 70%-100% of particulate matter from the Susquehanna River is trapped at the estuarine turbidity maximum (ETM) (Sanford et al, 2001;Schubel & Kana, 1972), which lies ∼10 km downstream of the river's mouth in this study.…”

Section: Sediment Load From Lower Susquehanna River To the Chesapeake...mentioning

confidence: 80%

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: Sediment Load From Lower Susquehanna River To the Chesapeake...mentioning

confidence: 80%

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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Modeling Impacts of Submersed Aquatic Vegetation on Sediment Dynamics Under Storm Conditions in Upper Chesapeake Bay

Biddle

Palinkas

Sanford

2021

Estuaries and Coasts

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Submersed aquatic vegetation is an important modulator of sediment delivery from the Susquehanna River through the Susquehanna Flats into the Chesapeake Bay. However, the impact of vegetation coupled with the physical drivers of sediment transport through the region are not well understood. This study used a new vegetation component in a coupled flow-wave-sediment transport modeling system (COAWST) to simulate summer through fall 2011, when the region experienced a sequence of events including Hurricane Irene and Tropical Storm Lee. Fine sediment was exported under normal flows and high wind forcing but accumulated under high flows. The relative effect of vegetation under normal and high wind forcing depended on previous sediment dynamics. Vegetation doubled the accumulation of fine sediments under high flows. While further refinement of the bed model may be needed to capture some nuances, the COAWST modeling system provides new insights into detailed sediment dynamics in complex vegetated deltaic systems.

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Relative Traffic Tolerance of Cool-Season Turfgrasses and Suitability for Grazing by Equine

Jaqueth

Turner

Iwaniuk

et al. 2019

Journal of Equine Veterinary Science

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A summary report of sediment processes in Chesapeake Bay and watershed

Cited by 11 publications

References 88 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

Modeling Impacts of Submersed Aquatic Vegetation on Sediment Dynamics Under Storm Conditions in Upper Chesapeake Bay

Relative Traffic Tolerance of Cool-Season Turfgrasses and Suitability for Grazing by Equine

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