Filters: Tags: Sensitivity Analysis (X)
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Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.The nature and the magnitude of the threat and burden posed by sites maintained in GeoTracker vary significantly by site type (e.g., leaking underground storage tank or cleanup site) and status (e.g., Completed Case Closed or Active Clean up). Thus, the indicator takes into account information about both the type of site and its status. Common groundwater pollutants found at LUST and cleanup sites in California include gasoline and diesel fuels, chlorinated solvents and other volatile organic compounds (VOCs) such as benzene, toluene, and methyl tert-butyl ether (MTBE); heavy metals such as lead, chromium and arsenic;...
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.California Office of Statewide Health Planning and Development (OSHPD) California Environmental Health Tracking Program (CEHTP) Environmental Health Investigations Branch, California Department of Public Health. Since 2005, hospitals licensed by the state of California to provide emergency medical services are required to report all emergency department (ED) visits to OSHPD. Federally-owned facilities, including Veterans Administration and Public Health Services hospitals are not required to report. The ED dataset includes information on the principal diagnosis, which can be used to identify which patients visited the...
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.Sensitivity Analysis of the CalEnviroScreen Model and Indicators: OEHHA applied a series of statistical analyses, as well as simpler numerical and graphical comparisons, to answer questions about the CalEnviroScreen model and the confidence in the results. The results of the sensitivity analysis on the January 2013 draft that informed the finalization of Version 1.0 of the CalEnviroScreen are presented in this document. The California Environmental Protection Agency (Cal/EPA) and the Office of Environmental Health Hazard Assessment (OEHHA) announce the availability of the California Communities Environmental Health Screening...
This paper reviews simplified process models for denitrification. More than fifty models were considered. The majority of these (simple) models are based on potential denitrification—either measured as a soil's property or computed from organic C dynamics—or consider denitrification as a first-order decay process. As it is generally accepted that environmental soil conditions affect the denitrification process, reduction functions are used. Although denitrification is truly driven by the non-availability of oxygen, most authors argue that oxygen dynamics in soil is hard to simulate (or to measure). Therefore, water content is used as a complementary for oxygen diffusion. The higher the water content, the less...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Geoderma,
actual denitrification,
elasticity,
potential denitrification,
reduction functions,
This data release contains model input and output files for simulating and predicting thermal spring flows at Hot Springs National Park (HOSP), Hot Springs, Arkansas. A three-dimensional hydrogeologic framework of the Hot Springs anticlinorium beneath Hot Springs National Park was constructed to represent the complex hydrogeology of HOSP and surrounding areas to depths exceeding 9,000 feet below ground surface. The framework, composed of 6 rock formations and 1 vertical fault emplaced beneath the thermal springs, was discretized into 19 layers, 429 rows, and 576 columns and incorporated into a 3-dimensional steady-state groundwater-flow model constructed in MODFLOW-2005. Historical daily mean thermal spring flows...
Often landmark conservation decisions are made despite an incomplete knowledge of system behavior and inexact predictions of how complex ecosystems will respond to management actions. For example, predicting the feasibility and likely effects of restoring top-level carnivores such as the gray wolf (Canis lupus) to North American wilderness areas is hampered by incomplete knowledge of the predator-prey system processes and properties. In such cases, global sensitivity measures, such as Sobol? indices, allow one to quantify the effect of these uncertainties on model predictions. Sobol? indices are calculated by decomposing the variance in model predictions (due to parameter uncertainty) into main effects of model...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Ecological Modelling,
Olympic National Park,
Sobol? sensitivity index,
compensatory mortality,
density dependence,
The aims of this study were to determine the energy consumption and evaluation of inputs sensitivity for soybean production in Kordkuy county of Iran. The data used in this study were obtained from 32 farmers using a face-to-face questionnaire base of random sampling method. The sensitivity of energy inputs was estimated using the marginal physical productivity (MPP) method and partial regression coefficients on soybean yield. The results indicated that the total input and output energy use was to be 18,026.50 and 71,228.86 MJ ha−1 respectively. With 66.67%, the diesel fuel was the highest within the energy equivalents and followed by chemical fertilizers and water for irrigation with 14.32% and 6.18% respectively....
Categories: Publication;
Types: Citation;
Tags: Econometric model,
Energy input,
Energy ratio,
Sensitivity analysis,
Soybean
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.Data Source: GeoTracker Database, State Water Resources Control Board (SWRCB) Indicator: Sum of weighted scores for sites within each ZIP code. The nature and the magnitude of the threat and burden posed by sites maintained in GeoTracker vary significantly by site type (e.g., leaking underground storage tank or cleanup site) and status (e.g., Completed Case Closed or Active Clean up). Thus, the indicator takes into account information about both the type of site and its status. Common groundwater pollutants found at LUST and cleanup sites in California include gasoline and diesel fuels, chlorinated solvents and other...
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.1) Data and Result.The California Environmental Protection Agency (Cal/EPA) and the Office of Environmental Health Hazard Assessment (OEHHA) announce the availability of an update to the California Communities Environmental Health Screening Tool: CalEnviroScreen 1.1. CalEnviroScreen is a screening methodology that can be used to help identify California communities that are disproportionately burdened by multiple sources of pollution. CalEnviroscreen 1.1 uses the same methodology as Version 1.0 except that the indicator for race/ethnicity was removed from the calculation of a communityâs CalEnviroScreen score. This change was made...
Using one- and two-dimensional homogeneous simulations, this paper addresses challenges associated with sensitivity analysis and parameter estimation for virus transport simulated using sorptive–reactive processes. Head, flow, and conservative- and virus-transport observations are considered. The paper examines the use of (1) observed-value weighting, (2) breakthrough-curve temporal moment observations, and (3) the significance of changes in the transport time-step size. The results suggest that (1) sensitivities using observed-value weighting are more susceptible to numerical solution variability, (2) temporal moments of the breakthrough curve are a more robust measure of sensitivity than individual conservative-transport...
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.American Community Survey U.S. Census Bureau The American Community Survey (ACS) is an ongoing survey of the U.S. population conducted by the U.S. Census Bureau and has replaced the long form of the decennial census. Unlike the decennial census, which attempts to survey the entire population and collects a limited amount of information, the ACS releases results annually based on a sub-sample of the population and includes more detailed information on socioeconomic factors such as poverty. Multiple years of data are pooled together to provide more reliable estimates for geographic areas with small population sizes....
Vegetative filter strips (VFS) are proposed for protection of receiving water bodies and aquatic organisms from pesticides in runoff, but there is debate regarding the efficiency and filter size requirements. This debate is largely due to the belief that no quantitative methodology exists for predicting runoff buffer efficiency when conducting acute and/or chronic environmental exposure assessments. Previous research has proposed a modeling approach that links the U.S. Environmental Protection Agency’s (EPA’s) PRZM/EXAMS with a well-tested process-based model for VFS (VFSMOD). In this research, we apply the modeling framework to determine (1) the most important input factors for quantifying mass reductions of pesticides...
Categories: Publication;
Types: Citation;
Tags: Data Visualization & Tools,
Exposure assessment,
Landscapes,
Northeast CASC,
Other Landscapes,
Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.Communities near agricultural fields, primarily farm worker communities, may be at risk for exposure to pesticides. Drift or volatilization of pesticides from agricultural fields can be a significant source of pesticide exposure. Complete statewide data on human exposures to pesticides do not exist. The most robust pesticide information available statewide are data maintained by the California Department of Pesticide Regulation showing where and when pesticides are used across the state. Pesticide use, especially use of volatile chemicals that can easily become airborne, can serve as an indicator of potential exposure....
(Includes all people in the U.S. Census who identified a race other than white or who identified as Hispanic, Latino, or Spanish origin) Communities Environmental Health Screening Tool, Version 1 (CalEnviroScreen 1.0) Data and Result.U.S. Census Bureau As part of the 2010 decennial census, the U.S. Census Bureau questionnaire asked all census respondents to identify if they were of Hispanic, Latino or Spanish origin and in a separate question, their race. Race and ethnicity are considered separate by the Census Bureau. Other questions asked of all respondents in the decennial census are age and date of birth, household relationship, sex, and home ownership. Datasets describing the number of individuals in different...
The aims of this study were to determine the energy consumption and evaluation of inputs sensitivity for soybean production in Kordkuy county of Iran. The data used in this study were obtained from 32 farmers using a face-to-face questionnaire base of random sampling method. The sensitivity of energy inputs was estimated using the marginal physical productivity (MPP) method and partial regression coefficients on soybean yield. The results indicated that the total input and output energy use was to be 18,026.50 and 71,228.86 MJ ha−1 respectively. With 66.67%, the diesel fuel was the highest within the energy equivalents and followed by chemical fertilizers and water for irrigation with 14.32% and 6.18% respectively....
Categories: Publication;
Types: Citation;
Tags: Econometric model,
Energy input,
Energy ratio,
Sensitivity analysis,
Soybean
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