Skip to main content
Advanced Search

Folders: ROOT > ScienceBase Catalog > USGS National Research Program > USGS National Research Program Projects ( Show direct descendants )

3,383 results (24ms)   

View Results as: JSON ATOM CSV
Groundwater resources in Cape Verde provide water for agriculture, industry, and human consumption. These resources are limited and susceptible to contamination. Additional groundwater resources are needed for continued agricultural development, particularly during times of drought, but increased use and (or) climatic change may have adverse effects on the quantity and quality of freshwater available. In volcanic island aquifers such as those of Cape Verde, a lens of fresh groundwater typically ?floats? upon a layer of brackish water at the freshwater/saltwater boundary, and increased pumping may cause salt water intrusion or other contamination. A recent U.S. Geological Survey study assessed baseline groundwater...
Categories: Publication; Types: Citation
Verplanck, P.L., McCleskey, R.B., and Roth, D.A., 2003, Inorganic water chemistry of the Boulder Creek Watershed, Colorado, during high-flow and low-flow conditions, 2000, Chapter 4 in Murphy, S.F., Verplanck, P.L., and Barber, L.B., eds., Comprehensive water quality of the Boulder Creek Watershed, Colorado, during high-flow and low-flow conditions, 2000: U.S. Geological Survey Water-Resources Investigations Report 03-4045, p. 71-102.
Categories: Publication; Types: Citation
When the Macondo well was shut in on July 15, 2010, the shut-in pressure recovered to a level that indicated the possibility of oil leakage out of the well casing into the surrounding formation. Such a leak could initiate a hydraulic fracture that might eventually breach the seafloor, resulting in renewed and uncontrolled oil flow into the Gulf of Mexico. To help evaluate whether or not to reopen the well, a MODFLOW model was constructed within 24 h after shut in to analyze the shut-in pressure. The model showed that the shut-in pressure can be explained by a reasonable scenario in which the well did not leak after shut in. The rapid response provided a scientific analysis for the decision to keep the well shut,...
Categories: Publication; Types: Citation
Mercury bioaccumulation in top predator fish of stream ecosystems is strongly positively correlated to filtered total mercury, filtered methylmercury, and dissolved organic carbon across large environmental gradients. Mercury bioaccumulation in top predator fish of stream ecosystems is strongly positively correlated to filtered total mercury, filtered methylmercury, and dissolved organic carbon across large environmental gradients.
Categories: Publication; Types: Citation
A matrix for water decontamination has an amended sorbant cellulose substrate with an iron (ferric) oxyhydroxide component and a component to sorb dissolved organic compounds retained by the cellulose substrate. C2 - May 24, 2005
Categories: Publication; Types: Citation
Evidence shows that high field strength (HFS) elements commonly used to index chemical weathering are variably mobile. This mobility may be linked to redistribution of suspended solids. A mass-balance model is presented that can quantify such redistribution without assuming immobility for any single element. Two tropical weathering profiles on quartz diorite and basalt are examined and redistribution of the HFS elements Zr and Ti is documented, along with potential corrections for the resulting changes in measured concentrations.
Categories: Publication; Types: Citation
Methylmercury production and pore water partitioning of total mercury and methylmercury in streambed sediment is a function of stream drainage basin characteristics. Methylmercury production and pore water partitioning of total mercury and methylmercury in streambed sediment is a function of stream drainage basin characteristics.
Categories: Publication; Types: Citation
Hormones and Pharmaceuticals Generated by Concentrated Animal Feeding Operations: Transport in Water and Soil examines how hormones, antibiotics and pharmaceuticals generated from concentrated animal feeding operations (CAFOs) of ...
This project is focused on developing objective methods for evaluating USGS hydrologic-data-collection activities; such methods are needed so that activities can be modified when necessary and the efficiency of USGS operations maximized.
Categories: Project; Tags: Statistical Hydrology