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Showing 1 to 19 of 19 for “"York River"”.
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The entocytherid ostracod fauna of the James and York River basins
… collected on crayfishes inhabiting the James and York River basins of Virginia. Of the seventeen species encountered, only one (Donnaldsoncythere ardis) seems to be endemic. Ankylocythere ancyla, Dactylocythere banana, Dt. falcata, Dt. suteri, Donnaldsoncythere ardis, Dn. hiwasseensis, Dn. …
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Clay mineralogy of sediments and source materials in the York River tributary basin
… of corresponding source materials. The York River tributary system was selected to conduct such a study because of its moderate size and its geographical and geological setting. The tributary basin spans the entire Piedmont and most of the Coastal Plain before reaching West Point, …
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Sub-Lethal Effects of Hypoxia/Hypercapnia on Callinectes Sapidus in the York River Estuary, Virginia
… of hypercapnia in shallow regions of the York River, 2) measure blue crab abundance, and 3) describe blue crab responses to hypoxiahypercapnia via field work at Taskinas Creek and lab measurements of respiration. Ambient D.O. and pH were positively correlated in the Taskinas Creek and York …
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Nitrification and denitrification: biological nitrogen removal and sludge generation at the York River treatment plant
Data from Hampton Roads Sanitation District was used to calculate nitrification and denitrification rates for the A²/O mode (1987) and the VIP mode (1988) of operation. Nitrification and denitrification rates compared to literature values for similar sludge ages. The mean VIP nitrification rate was …
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A Comparison of Recruitment Strategies Among Brachyuran Crustacean Megalopae of the York River, Lower Chesapeake Bay and Adjacent Shelf Waters
… stations forming a transect of the Pamunkey River, York River, lower Chesapeake Bay and adjacent coastal waters were sampled from July through September 1980. The megalopa stages of 11 brachyuran species were sampled. Vertical and horizontal distributions are described for each species in …
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Characteristics and conditioning of anaerobically digested sludge from a biological phosphorus removal plant
… biological phosphorus removal (BPR) plant (York River Wastewater Treatment Plant, York River, Va.) was conducted to determine the effects of BPR on sludge characteristics and conditioning requirements. Data collected from the plant indicated that both the total and soluble phosphorus (P) …
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Development of a Sediment Sampling Free Fall Penetrometer Add-on Unit for Geotechnical Characterization of Seabed Surface Layers
… laboratory and in the field (Yakutat, Alaska and York River, Virginia) in 2017. The samples were analyzed to understand the influence of different sampler characteristics on collected sample quality, and, to define mobile layer sampler characteristics that enable simultaneous geotechnical testing …
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“GUNS AND SHIPS AND SO THE BALANCE SHIFTS”: USING ARTIFACT PATTERNING TO CONTEXTUALIZE A SALVAGED ASSEMBLAGE DATED TO THE BATTLE OF YORKTOWN, 1781
Before General Charles Cornwallis surrendered at Yorktown in 1781, he scuttled a portion of his shipping fleet along the Yorktown riverbank to defend the town from a Franco- American amphibious attack. An environment rife with maritime material culture, the river has been subject to formal and …
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The effect of salinity on nutrient release from riverine and tributary estuarine sediments to the Chesapeake Bay under oxidizing and reducing conditions
… this objective, bench-scale microcosm studies of York River sediments and Occoquan Reservoir sediments were conducted. Seawater and freshwater were mixed in various ratios to simulate seasonal, salinity-varying environments in the Chesapeake Bay and its tributary estuaries. Experiments were …
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Migratory patterns of American shad (Alosa sapidissima) revealed by natural geochemical tags in otoliths
… analyses of natal origins. In an assessment of river-specific signatures in American shad (Alosa sapidissima), an anadromous clupeid native to the Atlantic coast of North America, stable isotope and elemental ratios in otoliths of juvenile American shad produced accurate natal tags from 12 …
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The effects of a phosphate detergent ban on a biological nutrient removal plant and anaerobic digester
… in Virginia, on the treatment streams of the York River Wastewater Treatment Plant, a biological nutrient removal (BNR) system. Evaluation of the available historical data indicated that the influent phosphorus load entering the plant in the post-ban period had decreased 27% compared to the …
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The 9th Virginia Infantry Regiment, C.S.A.
… most of the brigade counterattacked along the York River Railroad. The entire brigade remained as a support unit during the clash at Second Manassas. Following the battle, Armistead declined to set in motion a night attack, as suggested by a fellow general, because Armistead felt his command …
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Kinetics of the release and precipitation of phosphorus in anaerobic digesters sequencing biological phosphorus removal systems
… was examined. The research was conducted at the York River Wastewaster Treatment plant which was converted from a conventional system to a A/O process for biological phosphorus removal. The primary and secondary anaerobic digesters each had a solids retention time of approximately 120 days. The …
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Patterns of Diurnal Vertical Distribution and Dispersal-Recruitment Mechanisms of Decapod Crustacean Larvae and Postlarvae in the Chesapeake Bay, Virginia and Adjacent Offshore Waters
… stations were established for the present study: York River mouth (estuarine) (37°12'N, 76°16'W); Chesapeake Bay mouth (transition) (36°8'N, 76°07'W); Chesapeake Light Tower (offshore) (35°54'N, 75°3'W). Each station was occupied for a continuous 72 hour period in late summer, and quantitative …
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Investigation of the Relationships Between Geotechnical Sediment Properties and Sediment Dynamics Using Geotechnical and Geophysical Field Measurements
… Bay, Delaware; Pea Island, North Carolina; York River, Virginia; Potomac River, Maryland; Guadalupe River, Brazos River, Colorado River, Texas with different soil types and properties, hydrodynamic conditions, and morphological settings. The data collected was utilized to address the …
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Migratory patterns of American shad (Alosa sapidissima) revealed by natural geochemical tags in otoliths
… analyses of natal origins. In an assessment of river-specific signatures in American shad (Alosa sapidissima), an anadromous clupeid native to the Atlantic coast of North America, stable isotope and elemental ratios in otoliths of juvenile American shad produced accurate natal tags from 12 …
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In-Situ Geotechnical Characterization of Soft Estuarine Surficial Sediments Using a Portable Free Fall Penetrometer
… correction were investigated at sites in the York River Estuary and yielded a match to vane shear results at a logarithmic multiplier of k=0.1-0.3 and a power law rate exponent of β=0.01-0.03, indicating minimal strain rate effects. Resulting representative cone factors based on sediment …
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Oxygen Isotopes as a Tracer of DOM Processes in River-Estuary Systems
… In a series of laboratory irradiations using York River and Dismal Swamp water amended with either <sup>18</sup>O-enriched dissolved oxygen or water, the amount of <sup>18</sup>O incorporated into the high molecular weight dissolved organic matter was determined. For both sites, a fraction of …
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Trembling Earth
… My regional explorations span the James River, Tidewater swamps and architecture within the city of Richmond.My work depicts local history and ecology inspired by Richmond and the surrounding region. Subtle Gothic elements add anxiety to the otherwise pastoral scenes. Gothic foreboding in …