Water quality in the tidal Potomac River and estuary, hydrologic data report, 1979 water year

Blanchard, Stephen F.; Coupe, Richard H.; Woodward, Joan C.

doi:10.3133/ofr811074

Cited by 16 publications

(10 citation statements)

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“…The RQA data collection on the tidal Potomac River and Estuary was completed in September 1981. Four hydrologic data reports (Smith and Herndon, 1979, 1980a, 1980b, 1980c contain data for longitudinal surveys of the tidal river and estuary conducted between August 1977 and September 1978; one hydrologic data report (Blanchard, 1983) contains data at Chain Bridge; three hydrologic data reports (Blanchard and Hahl, 1981;Blanchard, Coupe, and Woodward 1982; Figure 1. The tidal Potomac River and Estuary.…”

Section: Philip Cohenmentioning

confidence: 99%

“…That is, the sampling frequency was increased to three or four times a day on very large floods and decreased to weekly during periods of low flow. For a more complete description of the methods of sample collection, shipment, and analysis used, refer to the four annual hydrologic data reports Blanchard and Hahl (1981), Blanchard and others (1982), , and Blanchard (1983).…”

Section: Water-quality Station and Sample Collectionmentioning

confidence: 99%

“…The reason for this is that on the average, approximately 55 percent of the total phosphorus is composed of suspended phosphorus. According to particle-size data presented by Blanchard and Hahl (1981), more than half the suspended sediment is composed of clay minerals, which have a high aluminum content. Iron is abundant in rocks and soils and is probably a major component in the rest of the suspended sediment.…”

Section: Phosphorusmentioning

confidence: 99%

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Transport of dissolved and suspended material by the Potomac River at Chain Bridge, at Washington, D.C., water years 1978-81

Blanchard¹,

Hahl²

1987

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Introduction 1 Background 1 Purpose and scope 3 Characteristics of the Potomac River at the measuring stations 3 Streamflow station and flow characteristics 3 Water-quality station and sample collection 3 Method of load computation 6 Cations and anions 6 Concentration estimation techniques 6 Computed loads 13 Evaluation of computed loads 14 Nutrient species, chlorophyll, and biochemical oxygen demand 14 Concentration estimation techniques 14 Computed loads 18 Evaluation of computed loads 18 Suspended sediment 26 Discussion 26 Frequency analysis of concentrations and loads 26 Seasonal variations in concentrations and loads 26 Storm runoff 28 Examination of selected water quality constituents 30 Phosphorus 30 Nitrogen 33 Silica 34 Suspended sediment 41 Historical extension of the data 41 Summary and conclusion 41 References cited 43 FIGURES 1. Map showing the tidal Potomac River and Estuary 2 2. Map showing location of stations:

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Section: Philip Cohenmentioning

confidence: 99%

Section: Water-quality Station and Sample Collectionmentioning

confidence: 99%

Section: Phosphorusmentioning

confidence: 99%

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Transport of dissolved and suspended material by the Potomac River at Chain Bridge, at Washington, D.C., water years 1978-81

Blanchard¹,

Hahl²

1987

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“…These factors included basic data on nutrient and chlorophyll a concentrations, discharge, temperature, salinity, specific conductance, pH, and light penetration collected during this project or by other scientists in the Potomac Estuary Study. Methods used to collect and analyze the collateral data from other studies can be found in Blanchard and Hahl (1981). Methods for collecting and analyzing of data from field and laboratory studies are explained below.…”

Section: Factors Affecting Distribution and Abundancementioning

confidence: 99%

Distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and Estuary, Maryland and Virginia, May 1978 to November 1981

Carter¹,

Paschal²,

Bartow³

1985

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Introduction 1 Background 2 Historical distribution 2 Study site 6 Methods 6 Submersed aquatic vegetation survey 6 Factors affecting distribution and abundance 8 Salinity, specific conductance, temperature and pH 8 Water depth 8 Substrate 8 Light penetration and water transparency 8 Epiphytes 8 Heavy metals 10 Field studies 10 Laboratory studies 10 Storm damage 10 Nutrients 10 Submersed aquatic vegetation transplants 10 Results 12 Submersed aquatic vegetation survey 12 Distribution 12 Factors affecting distribution and abundance 20 Depth and distance from shore 20 Substrate 20 Salinity, specific conductivity, temperature and pH 20 Light penetration and water transparency 22 Storm damage 22 Heavy metals 24 Epiphytes 24 Transplants 24 Discussion 33 Factors affecting distribution and abundance 33 Storm damage 33 Light and nutrient enrichment 36 Grazing 41 Substrate 41 Environmental Implications 41 Summary and conclusions 42 References cited 44 FIGURES 1. Map showing upper part of tidal Potomac River at low water and distribution of aquatic vegetation in 1916. 4 2. Map showing the tidal Potomac River, transition zone, and Estuary. 4 3. Map showing distribution and number of species of submersed aquatic vegetation in the tidal Potomac River and Estuary during 1978-81. 5 4. Map showing intensive data collection sites and other naturally-vegetated sites in the tidal Potomac River. 9 Contents 12. Concentrations of lead, manganese and zinc in tidal Potomac River and transition zone, 1979-81. 26 13. Relative growth of Vallisneria americana exposed to indicated concentrations of lead, manganese and zinc, 1980. 26 14. Epiphyte mean dry weight, chlorophyll 0 and percent transmission of light through epiphyte-colonized artificial substrates in the tidal Potomac River and Estuary, 1981. 28 15. Mean lengths of CeratophyUum demersuin in suspended-cage experiments in the tidal

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“…The Samples were collected during spring (May-June), summer (July-August), and fall (September-October) of 1978, 1980, and 1981. During 1979, samples were collected only during spring and fall because of the additional work involved with sampling the Virginia side of the river.…”

mentioning

confidence: 99%

Submersed aquatic vegetation in the tidal Potomac River and Estuary of Maryland, Virginia and the District of Columbia; Hydrologic data report, May, 1978 to November, 1981

Paschal¹,

Miller²,

Bartow³

et al. 1982

Open-File Report

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As part of a comprehensive interdisciplinary study of the tidal Potomac River and Estuary, the U.S. Geological Survey studied the distribution and abundance of submersed aquatic vegetation from 1978 to 1981. Sites were chosen throughout the tidal river and estuary. The plant species were identified; distribution and abundance of submersed aquatic vegetation were determined at the sites; and volumes, biomass-volume equivalents, and representative stem lengths were measured. Substrate types were identified, and particle size distribution, bottom nutrients, organic carbon, and heavy metals were measured at numerous sites. Water quality parameters that were measured included temperature, conductivity, salinity, secchi depth, photosynthetically active radiation, pH, chlorophyll a., nutrient concentrations, and epiphyte biomass. Experiments were performed in the field and in the laboratory to evaluate factors that would potentially affect distribution and abundance of aquatic macrophytes. For example, plants were suspended in cages and planted in exclosures, and transplant success was determined.

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Water quality in the tidal Potomac River and estuary, hydrologic data report, 1979 water year

Cited by 16 publications

References 0 publications

Transport of dissolved and suspended material by the Potomac River at Chain Bridge, at Washington, D.C., water years 1978-81

Transport of dissolved and suspended material by the Potomac River at Chain Bridge, at Washington, D.C., water years 1978-81

Distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and Estuary, Maryland and Virginia, May 1978 to November 1981

Submersed aquatic vegetation in the tidal Potomac River and Estuary of Maryland, Virginia and the District of Columbia; Hydrologic data report, May, 1978 to November, 1981

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