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Distributed hydrologic models typically require spatial estimates of precipitation interpolated from sparsely located observational points to the specific grid points. We compare and contrast the performance of regression-based statistical methods for the spatial estimation of precipitation in two hydrologically different basins and confirmed that widely used regression-based estimation schemes fail to describe the realistic spatial variability of daily precipitation field. The methods assessed are: (1) inverse distance weighted average; (2) multiple linear regression (MLR); (3) climatological MLR; and (4) locally weighted polynomial regression (LWP). In order to improve the performance of the interpolations, the...
Changes in the water-surface area occupied by the Cuitzeo Lake, Mexico, during the 1974–2001 period are analysed in this study. The research is based on remote sensing and geographic information techniques, as well as statistical analysis. High-resolution satellite image data were used to analyse the 1974–2000 period, and very low-resolution satellite image data were used for the 1997–2001 period. The long-term analysis (1974–2000) indicated that there were temporal changes in the surface area of the Cuitzeo Lake and that these changes were related to precipitation and temperatures that occurred in the previous year. Short-term monitoring (1997–2001) showed that the Cuitzeo Lake surface is lowering. Field observations...
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This location is part of the Arizona Mineral Industry Location System (AzMILS), an inventory of mineral occurences, prospects and mine locations in Arizona. Pima168 is located in T18S R15E Sec 23 NW in the Sahuarita - 15 Min quad. This collection consists of various reports, maps, records and related materials acquired by the Arizona Department of Mines and Mineral Resources regarding mining properties in Arizona. Information was obtained by various means, including the property owners, exploration companies, consultants, verbal interviews, field visits, newspapers and publications. Some sections may be redacted for copyright. Please see the access statement.
To access the influence of a vegetation on soil microorganisms toward organic pollutant biogegration, this study examined the rhizospheric effects of four plant species (sudan grass, white clover, alfalfa, and fescue) on the soil microbial community and in-situ pyrene (PYR) biodegradation. The results indicated that the spiked PYR levels in soils decreased substantially compared to the control soil without planting. With equal planted densities, the efficiencies of PYR degradation in rhizosphere with sudan grass, white clover, alfalfa and fescue were 34.0%, 28.4%, 27.7%, and 9.9%, respectively. However, on the basis of equal root biomass the efficiencies were in order of white clover >> alfalfa > sudan > fescue....
The impact of trace elements from the Iron Mountain Superfund site on the Sacramento River and selected tributaries is examined. The concentration and distribution of many trace elements—including aluminum, arsenic, boron, barium, beryllium, bismuth, cadmium, cerium, cobalt, chromium, cesium, copper, dysprosium, erbium, europium, iron, gadolinium, holmium, potassium, lanthanum, lithium, lutetium, manganese, molybdenum, neodymium, nickel, lead, praseodymium, rubidium, rhenium, antimony, selenium, samarium, strontium, terbium, thallium, thulium, uranium, vanadium, tungsten, yttrium, ytterbium, zinc, and zirconium—were measured using a combination of inductively coupled plasma-mass spectrometry and inductively coupled...
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General plant invasion vulnerability is illustrated by the colored polygons overlaid with the most susceptible habitats in floodplains (orange). Areas with a growing season of less than 120 days are predicted to be invasion resistant (white); areas in blue represent regions vulnerable to invasion by extremely cold-tolerant plants; and warmer green to yellow colors represent areas predicted to vulnerable to less cold tolerant species. Modeled infestation vulnerability in the North Slope for current Landscape Condition Model (LCM) , near-term LCM, long-term medium development scenario LCM, and long-term high development scenario LCM. These data are provided by Bureau of Land Management (BLM) "as is" and may contain...
Soluble reactive phosphorus (SRP) transport/retention was determined in two rain forest streams (Salto, Pantano) draining La Selva Biological Station, Costa Rica. There, SRP levels can be naturally high due to groundwater enriched by geothermal activity within the surfically dormant volcanic landscape, and subsequently discharged at ambient temperature. Combined field and laboratory approaches simulated high but natural geothermal SRP input with the objective of estimating the magnitude of amended SRP retention within high and low SRP settings and determining the underlying mechanisms of SRP retention. First, we examined short-term SRP retention/transport using combined SRP-conservative tracer additions at high...
The BLM GRSG ROD/ARMP/ARMPA habitat management areas include Priority Habitat Management Areas (PHMA), General Habitat Management Areas (GHMA), Important Habitat Management Areas (IHMA – Idaho only), Other Habitat Management Areas (OHMA – NV only), Linkage Connectivity Habitat Management Areas (LCHMAs – NWCO only), Restoration Habitat management Areas (RHMAs – Montana only), and Anthro Mountain (Utah only) from the final plan data in the western U.S. Sixteen Environmental Impact Statements (EIS) were referred to for these datasets, which were updated for UT in April of 2017 and for WY in October of 2017. These data are provided by Bureau of Land Management (BLM) “as is” and might contain errors or omissions. The...
Soluble reactive phosphorus (SRP) transport/retention was determined at four sites in three rainforest streams draining La Selva Biological Station, Costa Rica. La Selva is located at the base of the last remaining intact rainforest transect from 30 m above sea level to 3000 m along the entire Caribbean slope of Central America. Steam SRP levels can be naturally high there due to regional, geothermal groundwater discharged at ambient temperature. Monitoring since 1988 has revealed distinctive long-term differences in background SRP and total P (TP) for three streams in close proximity, and identified the impact of ENSO (El Nino Southern Oscillation) events on SRP-enriched reaches. Mean interannual SRP concentrations...
    map background search result map search result map ADMMR mining collection file: Elgin Mine Group BLM REA NOS 2012 Plant invasion vulnerability and proximity to vulnerable floodplain habitats and Modeled infestation vulnerability Figures D5 to D6 ADMMR mining collection file: Elgin Mine Group BLM REA NOS 2012 Plant invasion vulnerability and proximity to vulnerable floodplain habitats and Modeled infestation vulnerability Figures D5 to D6