Trace Metals, Lahontan Reservoir, 1993, EPA and DRI

Spatial variations in trace metal concentration are controlled by a complex set of parameters including reservoir sedimentation rates, dilution with pre-mining sediments, bed material mixing by shrink-swell processes, and factors that influence the sorption potential of the bed materials. Six years of below normal precipitation left much of the reservoir dry during the summer, 1992, and allowed for the precise delineation and mapping of the stratigraphic units that underlie Lahontan Reservoir.

The units were defined on the basis of spatial and topographic position, grain-size, composition, and the presence or absence of weathering zones. Once delineated, the units were mapped on 1: 12,000 scale aerial photographs. Subsequently, the photographic data were transferred to a stable base map for interpretation and analysis. Twelve stratigraphic units have been defined, nine of which post-date dam construction in 1915. One post-dam unit was deposited by eolian processes, while the remaining eight represent sedimentation in three lacustrine depositional environments: coastal, deep-water, and deltaic.

리소스

항목
CKAN dataset id 4363ff61-0437-4f35-a009-da28dde66d6e
상태 active
url https://catalog.data.gov/dataset/trace-metals-lahontan-reservoir-1993-epa-and-dri2
버전 2024-02-02
라이선스 cc-zero
access_constraints []
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bbox-north-lat 39.45607
bbox-south-lat 39.341551
bbox-west-long -119.192148
contact-email bain.andrew@epa.gov
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "1993-01-01"}]
frequency-of-update
guid EA2F598A-B567-4B76-989C-5EE38D629095
harvest_object_id 2a475c8b-0daf-4db0-a241-e26306f2d49a
harvest_source_id 9b3cd81e-5515-4bb7-ad3c-5ae44de9b4bd
harvest_source_title Environmental Dataset Gateway ISO Geospatial Metadata
licence []
lineage
metadata-date 2020-07-06
metadata-language eng
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-119.192148, 39.341551], [-119.048709, 39.341551], [-119.048709, 39.45607], [-119.192148, 39.45607], [-119.192148, 39.341551]]]}
progress
resource-type dataset
responsible-party [{"name": "EPA", "roles": ["publisher"]}]
spatial {"type": "Polygon", "coordinates": [[[-119.192148, 39.341551], [-119.048709, 39.341551], [-119.048709, 39.45607], [-119.192148, 39.45607], [-119.192148, 39.341551]]]}
spatial-data-service-type
spatial-reference-system 4326
spatial_harvester true
temporal-extent-end 1993-01-01T00:00:00
제공 기관 U.S. Environmental Protection Agency
최초 수집 일시 2024-02-20T23:30:53…
최근 수집 일시 2024-02-20T23:30:53…

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