Filters: Tags: sediment (X)
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The Alaska AMOCO geological sample collection contains sample number NRR-2 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NRR-10 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NRR-3 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NS-47 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NPP-7 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NZ-13 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NN-300-17 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NRR-20 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NSS-23 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NVV-8 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NWW-12 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NZ-20 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NP-48 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NN-39 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NPP-16 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number NS-43 with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number MN-207-007-I with the following attributes raw, core, sediment
The Alaska AMOCO geological sample collection contains sample number MN-203-004-II with the following attributes raw, core, sediment
Long-term monitoring of stream-bed sediments reveals spatial and temporal trends in metal concentrations. Here we use concentration gradient “heat maps” as a visualization tool to report annual mean arsenic, cadmium and copper concentrations along a contamination gradient in the Clark Fork River (CFR) in Western Montana. The CFR has been heavily impacted by large-scale mining operations since the 19th century. Legacy mine waste and tailings have been deposited within the streambed, banks, and floodplains more than 200 kilometers downstream. Sieved sediment samples (<63µm) have been collected at 10 stations along a 200 kilometer contamination gradient annually since 1996. Ongoing remediation activities in the upper...
Categories: Data;
Types: Data;
Tags: Clark Fork River,
Metals,
Sediment,
Trace-element,
USGS Science Data Catalog (SDC)
In 1991, the U.S. Geological Survey (USGS) began a study of more than 50 major river basins across the Nation as part of the National Water-Quality Assessment (NAWQA) project of the National Water-Quality Program. One of the major goals of the NAWQA project is to determine how water-quality conditions change over time. To support that goal, long-term consistent and comparable monitoring has been conducted on streams and rivers throughout the Nation. Outside of the NAWQA project, the USGS and other Federal, State, and local agencies also have collected long-term water-quality data to support their own assessments of changing water-quality conditions. Data from these multiple sources have been combined to support...
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