336 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "Watersheds"

open access

Discriminating between west-side sources of nutrients and organiccarbon contributing to algal growth and oxygen demand in the San JoaquinRiver

The purpose of this study was to investigate the Salt and Mud Slough tributaries as sources of oxygen demanding materials entering the San Joaquin River (SJR). Mud Slough and Salt Slough are the main drainage arteries of the Grasslands Watershed, a 370,000-acre area west of the SJR, covering portions of Merced and Fresno Counties. Although these tributaries of the SJR are typically classified as agricultural, they are also heavily influenced by Federal, State and private wetlands. The majority … more

Date: July 24, 2002

Creator: Wstringfellow@lbl.gov

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Environmental Solutions FY05: PNNL Contributions to U.S. Department of Energy

The U.S. Department of Energy's mission is to protect the Columbia River, a vital regional asset, and the public in cities and towns near the Site. To make decisions and comply with a complex system of regulations, DOE needs reliable, accurate data about the Site. Where are the contaminants now? At what concentrations? What impact do the contaminants have on people that work on the Site and live nearby? To answer these questions and others, Pacific Northwest National Laboratory scientists colle… more

Date: December 31, 2006

Creator: Freshley, Mark D. & Manke, Kristin L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Forest Restoration Carbon Analysis of Baseline Carbon Emissions and Removal in Tropical Rainforest at La Selva Central, Peru

Conversion of tropical forest to agricultural land and pasture has reduced forest extent and the provision of ecosystem services, including watershed protection, biodiversity conservation, and carbon sequestration. Forest conservation and reforestation can restore those ecosystem services. We have assessed forest species patterns, quantified deforestation and reforestation rates, and projected future baseline carbon emissions and removal in Amazon tropical rainforest at La Selva Central, Peru. … more

Date: January 10, 2006

Creator: Gonzalez, Patrick; Kroll, Benjamin & Vargas, Carlos R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Quantitative Approach to Incorporating Stakeholder Values into Total Maximum Daily Loads: Dominguez Channel Case Study

The federal Clean Water Act (CWA) Section 303(d)(1)(A) requires each state to conduct a biennial assessment of its waters, and identify those waters that are not achieving water quality standards. The result of this assessment is called the 303(d) list. The CWA also requires states to establish a priority ranking for waters on the 303(d) list of impaired waters and to develop and implement Total Maximum Daily Loads (TMDLs) for these waters. Over 30,000 segments of waterways have been listed as … more

Date: March 3, 2005

Creator: Stewart, J.; Greene, G.; Smith, A. & Sicherman, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Impact of alfalfa on soil and water quality

Dominance of row crop agriculture in rolling landscapes of western and Southwestern Minnesota is identified as a primary, non-point source of sediments and associated pollutants reaching the Minnesota River. Currently as a biomass energy project, alfalfa is being promoted in western Minnesota to harvest the leaves for animal feed and stems to generate electricity. As a perennial, leguminous crop grown with minimum inputs, introduction of alfalfa in row cropped lands has potential to improve bot… more

Date: October 30, 1997

Creator: Sharma, P.; Moncrief, J. & Gupta, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Elevated Concentrations of Primordial Radionuclides in Sediments from the Reedy River and Surrounding Creeks in Simpsonville, South Carolina

A gamma-ray survey and analysis of sixteen riverbed samples from the Reedy River watershed near Simpsonville, SC were conducted and compared with national and international studies of primordial radionuclides. The study reported here follows on a recent discovery of anomalously high uranium concentrations in several private well waters in the area near Simpsonville, SC. A HPGe spectrometer was used for quantification of gamma emitting radionuclides in the sediments. All sediments contained radi… more

Date: December 27, 2006

Creator: Powell, B. A.; Hughes, L. D.; Soreefan, A. M.; Falta, D.; Wall, M. & DeVol, T. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transport of fallout and reactor radionuclides in the drainage basin of the Hudson River estuary

The transport and fate of Strontium 90, Cesium 137 and Plutonium 239, 240 in the Hudson River Estuary is discussed. Rates of radionuclide deposition and accumulation over time and space are calculated for the Hudson River watershed, estuary, and continental shelf offshore. 37 references, 7 figures, 15 tables. (ACR)

Date: January 1, 1982

Creator: Simpson, H. J.; Linsalata, P. & Olsen, C. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

On the development of a coupled land surface and groundwater model

Management of surface water quality is often complicated by interactions between surface water and groundwater. Traditional Land-Surface Models (LSM) used for numerical weather prediction, climate projection, and as inputs to water management decision support systems, do not treat the LSM lower boundary in a fully process-based fashion. LSMs have evolved from a leaky bucket to more sophisticated land surface water and energy budget models that typically have a so-called basement term to depict … more

Date: May 4, 2004

Creator: Maxwell, R. M. & Miller, N. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pine Creek Ranch, FY 2001 Annual Report.

Pine Creek Ranch was purchased in 1999 by the Confederated Tribes of Warm Springs using Bonneville Power Administration Fish and Wildlife Habitat Mitigation funds. The 25,000 acre property will be managed in perpetuity for the benefit of fish and wildlife habitat. Major issues include: (1) Restoring quality spawning and rearing habitat for stealhead. Streams are incised and fish passage barriers exist from culverts and possibly beaver dams. In addition to stealhead habitat, the Tribes are inter… more

Date: November 1, 2001

Creator: Berry, Mark E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Closure Report for Corrective Action Unit 110: Areas 3 RWMS U-3ax/bl Disposal Unit, Nevada Test Site, Nevada

This Closure Report (CR) has been prepared for the Area 3 Radioactive Waste Management Site (RWMS) U-3ax/bl Disposal Unit Corrective Action Unit (CAU) 110 in accordance with the reissued (November 2000) Resource Conservation and Recovery Act (RCRA) Part B operational permit NEV HW009 (Nevada Division of Environmental Protection [NDEP], 2000) and the Federal Facility and Consent Order (FFACO) (NDEP et al., 1996). CAU 110 consists of one Corrective Action Site 03-23-04, described as the U-3ax/bl … more

Date: August 1, 2001

Creator: Smith, J. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geochemical and stable isotope variations in baseflow from an urbanized watershed: White Rock Creek, Dallas, Texas

Public concerns about surface water quality and its impact on health issues have put a premium on the ability to predict surface and groundwater quality in urban areas. The movement of toxins and nutrients in urban areas is largely controlled by interactions with soil and aquifer minerals along hydrologic pathways. Despite progress in theoretical modeling of the effects of these interactions on water chemistry, it is presently impossible to predict overall trends in urban water quality. Determi… more

Date: March 1, 1995

Creator: Hercod, Debra J.; Brady, Patrick V. & Gregory, Robert T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ecosystems, Biomes, and Watersheds: Definitions and Use

This paper describes the meaning and applications of ecosystem and of the related terms watershed and biome. It discusses the pros and cons of all three as organizing principles for land management, and the major issues that are likely to arise in the debate over ecosystem management.

Date: July 14, 1993

Creator: Corn, M. Lynne

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Remedial investigation report on the Melton Valley watershed at Oak Ridge National Laboratory, Oak Ridge, Tennessee. Volume 2: Appendixes A and B

The Melton Valley watershed presents a multifaceted management and decision-making challenge because of the very heterogeneous conditions that exist with respect to contaminant type, disposal unit age, mode of disposal, release mechanism, and potential risk-producing pathways. The investigation presented here has assembled relevant site data in the geographic context with the intent of enabling program managers and decision-makers to understand site conditions and evaluate the necessity, relati… more

Date: May 1, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Annual Report on Environmental Monitoring Activities for FY 1995 (Baseline Year) at Waste Area Grouping 6 at Oak Ridge National Laboratory, Oak Ridge, Tennessee

This report describes baseline contaminant release conditions for Waste Area Grouping (WAG) 6 at Oak Ridge National Laboratory (ORNL). The sampling approach and data analysis methods used to establish baseline conditions were presented in ``Environmental Monitoring Plan for Waste Area Grouping 6 at Oak Ridge National Laboratory, Oak Ridge, Tennessee (EMP).`` As outlined in the EMP, the purpose of the baseline monitoring year at WAG 6 was to determine the annual contaminant releases from the sit… more

Date: June 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Tulane/Xavier University Hazardous Materials in Aquatic Environments of the Mississippi River Basin. Quarterly progress report, January 1, 1995--March 31, 1995

This progress report covers activities for the period January 1 - March 31, 1995 on project concerning `Hazardous Materials in Aquatic Environments of the Mississippi River Basin.` The following activities are each summarized by bullets denoting significant experiments/findings: biotic and abiotic studies on the biological fate, transport and ecotoxicity of toxic and hazardous waste in the Mississippi River Basin; assessment of mechanisms of metal-induced reproductive toxicity in quatic species… more

Date: May 1, 1995

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

White Oak Creek Watershed: Melton Valley Area Remedial Investigation Report, Oak Ridge National Laboratory, Oak Ridge, Tennessee: Volume 1 Main Text

The purpose of this Remedial Investigation (RI) report is to present an analysis of the Melton Valley portion of the White Oak Creek (WOC) watershed, which will enable the US Department of Energy (DOE) to pursue a series of cost-effective remedial actions resulting in site cleanup and stabilization. In this RI existing levels of contamination and radiological exposure are compared to levels acceptable for future industrial and potential recreational use levels at the site. This comparison provi… more

Date: November 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The UC-LLNL Regional Climate System Model

The UC-LLNL Regional Climate System Model has been under development since 1991. The unique system simulates climate from the global scale down to the watershed catchment scale, and consists of data pre- and post- processors, and four model components. The four model components are (1) a mesoscale atmospheric simulation model, (2) a soil-plant-snow model, (3) a watershed hydrology-riverflow model, and (4) a suite of crop response models. The first three model components have been coupled, and t… more

Date: September 1, 1996

Creator: Miller, N. L. & Kim, Jinwon

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

White Oak Creek Watershed: Melton Valley Area Remedial Investigation Report, Oak Ridge National Laboratory, Oak Ridge, Tennessee: Volume 3 Appendix C

This report provides details on the baseline ecological risk assessment conducted in support of the Remedial Investigation (RI) Report for the Melton Valley areas of the White Oak Creek watershed (WOCW). The RI presents an analysis meant to enable the US Department of Energy (DOE) to pursue a series of remedial actions resulting in site cleanup and stabilization. The ecological risk assessment builds off of the WOCW screening ecological risk assessment. All information available for contaminate… more

Date: November 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Clean Water Action Plan: Restoring and protecting America`s waters

On October 18, 1997, the 25th anniversary of the enactment of the Clean Water Act, the Vice President called for a renewed effort to restore and protect water quality. The Vice President asked that the Secretary of Agriculture and the Administrator of the Environmental Protection Agency (EPA), working with other affected agencies, develop a Clean Water Action Plan that builds on clean water successes and addresses three major goals: (1) enhanced protection from public health threats posed by wa… more

Date: February 1998

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Modeling nitrogen cycling in forested watersheds of Chesapeake Bay

The Chesapeake Bay Agreement calls for a 40% reduction of controllable phosphorus and nitrogen to the tidal Bay by the year 2000. To accomplish this goal the Chesapeake Bay Program needs accurate estimates of nutrient loadings, including atmospheric deposition, from various land uses. The literature was reviewed on forest nitrogen pools and fluxes, and nitrogen data from research catchments in the Chesapeake Basin were identified. The structure of a nitrogen module for forests is recommended fo… more

Date: March 1995

Creator: Hunsaker, C. T.; Garten, C. T. & Mulholland, P. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Report on the remedial investigation of Bear Creek Valley at the Oak Ridge Y-12 Plant, Oak Ridge, Tennessee. Volume 6: Appendix G -- Baseline ecological risk assessment report

This Remedial Investigation (RI) Report characterizes the nature and extent of contamination, evaluates the fate and transport of contaminants, and assesses risk to human health and the environment resulting from waste disposal and other US Department of Energy (DOE) operations in Bear Creek Valley (BCV). BCV, which is located within the DOE Oak Ridge Reservation (ORR) encompasses multiple waste units containing hazardous and radioactive wastes arising from operations at the adjacent Oak Ridge … more

Date: September 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

White Oak Creek watershed: Melton Valley area Remedial Investigation report, at the Oak Ridge National Laboratory, Oak Ridge, Tennessee: Volume 2, Appendixes A and B

This document contains Appendixes A ``Source Inventory Information for the Subbasins Evaluated for the White Oak Creek Watershed`` and B ``Human Health Risk Assessment for White Oak Creek / Melton Valley Area`` for the remedial investigation report for the White Oak Creek Watershed and Melton Valley Area. Appendix A identifies the waste types and contaminants for each subbasin in addition to the disposal methods. Appendix B identifies potential human health risks and hazards that may result fro… more

Date: November 1, 1996

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Quantitative precipitation and river flow predictions over the southwestern United States

Accurate predictions of local precipitation and river flow are crucial in the western US steep terrain and narrow valleys can cause local flooding during short term heavy precipitation. Typical size of hydrologically uniform watersheds within the mountainous part of the western US ranges 10{sup 2} to 10{sup 3} km{sup 2}. Such small watershed size, together with large variations in terrain elevations and a strong dependence of precipitation on terrain elevation, requires a find-resolution and we… more

Date: September 1, 1996

Creator: Kim, J. & Miller, N. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Remedial investigation report on the Melton Valley watershed at Oak Ridge National Laboratory, Oak Ridge, Tennessee. Volume 3: Appendix C

Date: May 1, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department