Allen C Gellis

These data represent a one-time synoptic survey of sampled soils, pavement dust, and stream sediment in 10 urban watersheds in three regions of the United States (Pacific Northwest, northeast, and southeast) to evaluate sources of sediment and two groups of common urban contaminants: polycyclic aromatic hydrocarbons (PAHs) and metals. Analyses of samples from six of the watersheds included fallout radionuclides to facilitate identification of sediment sources to the streams. Scripts used in R to test selected explanatory variables for the urban contaminants using Generalize Additive Models (GAMs) are included. The data release also includes Geographic Information System (GIS) spatial layers that were developed for...

Tags: Pacific Northwest, USGS Science Data Catalog (SDC), Water Quality, contamination and pollution, dust, All tags... environment, health, inlandWaters, northeast Unites States, pavement sealants, sediment, soil, southeast United States, water quality, Fewer tags

Sediment-sample and climate data for the agricultural and forested parts of Smith Creek watershed, Virginia (2012-2015)

This metadata record covers 5 comma delimited ascii files that contain sediment source sample data, sediment target sample data, quantitation limits for samples, and daily temperature data. This data release is a companion to the journal article Sediment fingerprinting to delineate sources of fine-grained sediment in the agricultural and forested Smith Creek watershed, Virginia (2012-2015).

Categories: Data; Tags: Aquatic Biology, Geomorphology, Smith Creek, USGS Science Data Catalog (SDC), Virginia, All tags... erosion, geomorphology, sediment transport, Fewer tags

Sources of fine-grained sediment in the Linganore Creek Watershed, Frederick and Carroll Counties, Maryland, 2008-2010

This dataset provides physical and chemical data for a sediment-fingerprinting study conducted in the upper parts of the Linganore Creek watershed in an effort to quantify and determine the sources of fine-grained sediments eroded from and deposited on streambanks, flood plains, channel beds, and agricultural and forested uplands. Data were collected from August 1, 2008 through December 31, 2010. Chemical data include median particle size, total organic carbon (C) and total nitrogen (N), and concentrations for 19 elements. Physical data includes upstream drainage area from sampling location as well as land-use type.

Categories: Data; Tags: Carroll county, Frederick county, Linganore Creek, Maryland, Monocacy River, All tags... USGS Science Data Catalog (SDC), Water Resources, agriculture, environment, field monitoring station, inlandWaters, land use and land cover, sediment transport, surface water quality, suspended material, Fewer tags

Channel response to sediment release: insights from a paired analysis of dam removal

Dam removals with unmanaged sediment releases are good opportunities to learn about channel response to abruptly increased bed material supply. Understanding these events is important because they affect aquatic habitats and human uses of floodplains. A longstanding paradigm in geomorphology holds that response rates to landscape disturbance exponentially decay through time. However, a previous study of the Merrimack Village Dam (MVD) removal on the Souhegan River in New Hampshire, USA, showed that an exponential function poorly described the early geomorphic response. Erosion of impounded sediments there was two-phased. We had an opportunity to quantitatively test the two-phase response model proposed for MVD by...

Categories: Publication; Types: Citation

Floodplain sedimentation, bank erosion, and biogeochemical cycling of sediment and nutrients in Smith Creek (Virginia) 2012-2015: U.S. Geological Survey data release

This USGS Data Release represents tabular data for chemical and physical attributes, rates of deposition, erosion, and mineralization of bank and floodplain sediments and soils from five study sites in the Smith Creek watershed between 2012 and 2015. The data release was produced in compliance with the new 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. The dataset consists of 2 separate items: 1. Smith Creek floodplain soils dataset (tabular data) 2. Smith Creek bank soils dataset (tabular data) These data support the following publication: Gillespie, J.L., Noe, G.B., Hupp, C.R., Gellis, A.C., and Schenk, E.R.,...

Categories: Data; Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Chesapeake Bay, Massanutten Mountain Ridge, Rockingham County, VA, Shenandoah County, VA, Shenandoah Valley, All tags... USGS Science Data Catalog (SDC), floodplain, karst, mineralization, nitrogen, phosphorus, sediment budget, Fewer tags