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Management Measures for Marinas and Recreational Boating - IV. GlossaryIV. GlossaryBathymetric: Pertaining to the depth of a waterbody. Bed load transport: Sediment transport along the bottom of a waterbody due to currents. Benthic: Associated with the sea bottom. Biocriteria: Biological measures of the health of an environment, such as the incidence of cancer in benthic fish species. BOD: Biochemical oxygen demand; the quantity of dissolved oxygen used by microorganisms in the biochemical oxidation of organic matter and oxidizable inorganic matter by aerobic biological action. Circulation cell: See gyre. Conservative pollutant: A pollutant that remains chemically unchanged in the water. Critical habitat: A habitat determined to be important to the survival of a threatened or endangered species, to general environmental quality, or for other reasons as designated by the State or Federal government. DO: Dissolved oxygen; the concentration of free molecular oxygen in the water column. Drogue-release study: A study of currents and circulation patterns using objects, or drogues, placed in the water at the surface or at specified depths. Dye-release study: A study of dispersion using nontoxic dyes. Exchange boundary: The boundary between one waterbody, e.g., a marina, and its parent waterbody; usually the marina entrance(s). Fecal coliform: Bacteria present in mammalian feces, used as an indicator of the presence of human feces, bacteria, viruses, and pathogens in the water column. Fixed breakwater: A breakwater constructed of solid, stationary materials. Floating breakwater: A breakwater constructed to possess a limited range of movement. Flushing time: Time required for a waterbody, e.g., a marina, to exchange its water with water from the parent waterbody. Gyre: A mass of water circulating as a unit and separated from other circulating water masses by a boundary of relatively stationary water. Hydrographic: Pertaining to ground or surface water. Ichthyofauna: Fish. Macrophytes: Plants visible to the naked eye. Mathematical modeling: Predicting the performance of a design based on mathematical equations. Micron: Micrometer; one-one millionth (0.000001) of a meter. NCDEM DO model: A mathematical model for calculating dissolved oxygen concentrations developed by the North Carolina Division of Environmental Management (NCDEM). No-discharge zone: An area where the discharge of polluting materials is not permitted. NPDES: National Pollutant Discharge Elimination System. A permitting system for point source polluters regulated under section 402 of the Clean Water Act. Numerical modeling: See mathematical modeling. Nutrient transformers: Biological organisms, usually plants, that remove nutrients from water and incorporate them into tissue matter. Organics: Carbon-containing substances such as oil, gasoline, and plant matter. PAH: Polynuclear aromatic hydrocarbon; multiringed carbon molecules resulting from the burning of fossil fuels, wood, etc. Physical modeling: Using a small-scale physical structure to simulate and predict the performance of a full-scale structural design. Rapid bioassessment: An assessment of the environmental degradation of a waterbody based on a comparison between a typical species assemblage in a pristine waterbody and that found in the waterbody of interest. Removal efficiency: The capacity of a pollution control device to remove pollutants from wastewater or runoff. Residence time: The length of time water remains in a waterbody. Generally the same as flushing time. Riparian: For the purposes of this report, riparian refers to areas adjoining coastal waterbodies, including rivers, streams, bays, estuaries, coves, etc. Sensitivity analysis: Modifying a numerical model's parameters to investigate the relationship between alternative [marina] designs and water quality. Shoaling: Deposition of sediment causing a waterbody or location within a waterbody to become more shallow. Significant: A quantity, amount, or degree of importance determined by a State or local government. SOD: Sediment oxygen demand; biochemical oxygen demand of microorganisms living in sediments. Suspended solids: Solid materials that remain suspended in the water column. Tidal prism: The difference in the volume of water in a waterbody between low and high tides. Tidal range: The difference in height between mean low tide and mean high tide. Velocity shear: Friction created by two masses of water moving in different directions or at different speeds in the same direction. WASP4 model: A generalized modeling system for contaminant fate and transport in surface waters; can be applied to BOD, DO, nutrients, bacteria, and toxic chemicals. Return to the Table of Contents
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