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Hydrologic and sedimentologic data collected during three cruises at low water on the Mississippi River and some of its tributaries, July 1987-June 1988

1992; United States Department of the Interior; Linguagem: Inglês

10.3133/ofr91485

2332-4899

John A. Moody, Robert H. Meade,

Fish Ecology and Management Studies

Water, suspended-sediment, and bed-sediment samples were collected for physical (particle size and mineralogy) and chemical analysis (radioactive elements, trace metals, nutrients, petrochemical hydrocarbons, organic volatiles, pesticides, detergents, organic carbon, and humic substances) from 21 sites on the Mississippi River and its main tributaries.Three cruises were made at low water during a 1-year period from July 18, 1987, to June 7, 1988.The maximum measured discharge was about 10,400 cubic meters per second on December 15, 1987, at Vicksburg, Mississippi, and the maximum measured suspended-sediment discharge was 354,000 metric tons per day in the Missouri River at Hermann, Missouri, on July 20, 1987.The equal-width-increment (equal-transit-rate), depth-integration method was used at 10-40 verticals across the river to collect between 70 and 137 liters of river water with an isokinetic sampler (made of Teflon to prevent chemical contamination).This report contains the following hydrologic data associated with the suspended-sediment samples: cross-sectional area of the river; mean depth; mean velocity; water discharge; particle sizes; concentrations of the suspended sand, silt, and colloid fractions; and surface temperature and conductivity at 10-40 locations across the river.These data provide the framework for subsequent interpretive chemical analyses of the samples collected during the three cruises.'Discharge for Mississippi River at Alton, Illinois minus discharge for the Illinois River.2Discharge for the Illinois River below Meredosia, Illinois.3Drainage area taken from the Missouri Water Resources Data for water years 1985-86.^Sediment discharge was estimated by Keown and others (1981) by differences.5Drainage area is for the gaging station at Clarendon, Arkansas.Discharge was supplied by the U.S.