Compensatory Response Of Fathead Minnow Larvae Following A Pulsed In-Situ Exposure To A Seasonal Agricultural Runoff Event, 2017 University of Nebraska Medical Center
Compensatory Response Of Fathead Minnow Larvae Following A Pulsed In-Situ Exposure To A Seasonal Agricultural Runoff Event, Jonathan M. Ali, John Sangster, Daniel D. Snow, Shannon L. Bartelt-Hunt, Alan S. Kolok
Faculty Publications from The Water Center
Agriculturally-dominated waterways such as those found throughout the Midwestern United States often experience seasonal pulses of agrichemical contaminants which pose a potential hazard to aquatic organisms at varying life stages. The objective of this study was to characterize the developmental plasticity of fathead minnow larvae in a natural environment subject to a seasonal episodic perturbation in the form of a complex mixture of agricultural stressors. Fathead minnow larvae were maintained at the Elkhorn River Research Station for a 28-d in situ exposure to an agrichemical pulse event.Minnow larvae were sampled after 14 and 28 days to characterize developmental plasticity ...
In-Situ Observation And Transport Modelling Of Arsenic In Gangetic Plain, India, 2017 Indian Institute of Technology Roorkee
In-Situ Observation And Transport Modelling Of Arsenic In Gangetic Plain, India, Pankaj Kumar Gupta, Pranjay Joshi, Jahangeer
Water for Food Faculty Publications
The focus of this study is to investigate the arsenic movement and impacts on the residual concentrations on groundwater pollution load. The Gangetic plain area in the Ballia, Uttar Pradesh is selected as study area, which is also reported to extreme arsenic pollution in soil-water system. A modelling approach is developed to assess the arsenic flux in partially saturated zone using data of soil texture, soil hydraulic properties and stratigraphy. Soil type, slope, and land-use cover is considered for estimating the transient flux at the top boundary from daily precipitation and evapotranspiration data of the study area. Solute transport in ...
Aquacrop-Os: An Open Source Version Of Fao’S Crop Water Productivity Model, 2017 University of Manchester
Aquacrop-Os: An Open Source Version Of Fao’S Crop Water Productivity Model, T. Foster, N. Brozovic, A. P. Butler, C. M. U. Neale, D. Raes, P. Steduto, E. Fereres, T. C. Hsiao
Water for Food Faculty Publications
Crop simulation models are valuable tools for quantifying crop yield response to water, and for devising strategies to improve agricultural water management. However, applicability of the majority of crop models is limited greatly by a failure to provide open-access to model source code. In this study, we present an open-source version of the FAO AquaCrop model, which simulates efficiently water-limited crop production across diverse environmental and agronomic conditions. Our model, called AquaCrop-OpenSource (AquaCrop-OS), can be run in multiple programming languages and operating systems. Support for parallel execution reduces significantly simulation times when applying the model in large geospatial frameworks, for ...
Segment-Based Reliability Assessment For Water Distribution Networks, 2017 University of Kentucky
Segment-Based Reliability Assessment For Water Distribution Networks, Erika Hernandez Hernandez
Theses and Dissertations--Civil Engineering
In recent years, water utilities have placed a greater emphasis on the reliability and resilience of their water distribution networks. This focus has increased due to the continuing aging of such infrastructure and the potential threat of natural or man-made disruptions. As a result, water utilities continue to look for ways to evaluate the resiliency of their systems with a goal of identifying critical elements that need to be reinforced or replaced. The simulation of pipe breaks in water reliability studies is traditionally modeled as the loss of a single pipe element. This assumes that each pipe has an isolation ...
Estimating Longitudinal Dispersion Coefficients In Natural Channels, 2017 Iowa State University
Estimating Longitudinal Dispersion Coefficients In Natural Channels, Yuqi Song
Graduate Theses and Dissertations
A new empirical formula is developed for estimating the longitudinal dispersion coefficient. Velocity profiles are computed from the momentum equation as presented by Shiono and Knight (1991), and the dispersion coefficient is computed from the velocity profiles using the theory of shear dispersion (Taylor 1953, Fischer et al. 1979). To simplify the application, results of the numerical integration are expressed in terms of the aspect ratio of the channel, the friction factor, the dimensionless eddy viscosity, and the secondary flow coefficient using multiple regression. For laboratory data, 83.3% of the empirical estimates from the initial formula fall within 50 ...
Improved Predictions Of Contaminant Transport In Rivers, 2017 Iowa State University
Improved Predictions Of Contaminant Transport In Rivers, Rusen Sinir
Graduate Theses and Dissertations
To improve predictions of contaminant transport in rivers, two analytical models and one empirical model were evaluated. Analytical solutions of the model of Reichert and Wanner (1991), which represents mixing in the advective zone by dividing the channel into a flowing zone and a stagnant zone, were developed for two cases: a spill in the stagnant zone and a maintained injection in the flowing zone. Compared to the case of a flowing zone spill solved by Schmalle and Rehmann (2014), contaminant clouds for a stagnant zone spill travel more slowly, spread more, and shift from positive to negative skewness. These ...
Methods For Incorporating Ecological Impacts With Climate Uncertainty To Support Robust Flood Management Decision-Making, 2017 University of Massachusetts - Amherst
Methods For Incorporating Ecological Impacts With Climate Uncertainty To Support Robust Flood Management Decision-Making, Caitlin M. Spence
Modern and historic flood risk management involves accommodating multiple sources of sources of uncertainty and potential impacts across a broad range of interrelated sectors. Sources of uncertainty that affect planning include internal climate variability, anthropogenic changes such as land use and system performance expectations, and more recently changes in climatology that affect the resources supporting the system. Flood management systems potentially impact human settlements within and beyond the systems’ scope of planning, local weather patterns, and associated ecological systems. Federal guidelines across nations have called for greater consideration of uncertainty and impacts of water resources planning projects, but methods for ...
Flow And Transport From A Stream To A Well In An Unconfined Aquifer, 2017 Iowa State University
Flow And Transport From A Stream To A Well In An Unconfined Aquifer, Cynthia Louise Maroney
Graduate Theses and Dissertations
Flow, stream depletion rate (SDR), and transport are evaluated with three analytical models for wells installed in a semi-infinite, homogeneous, anisotropic, unconfined aquifer near a fully penetrating stream with a streambed with reduced conductivity. The first model, presented in Maroney and Rehmann (2017), involves re-evaluating the calculations of Huang et al. (2012) for the SDR of a radial collector well. The present solution for SDR has a single integral that requires numerical evaluation, while the previous model has five. Analytical results show that at steady state the flow through the streambed equals the pumping rate of the well. That is ...
High Performance Techniques Applied In Partial Differential Equations Library, 2017 College of Saint Benedict/Saint John's University
High Performance Techniques Applied In Partial Differential Equations Library, Shilei Lin
All College Thesis Program, 2016-present
This thesis explores various Trilinos packages to determine a method for updating the deal.ii library, which specializes in solving partial differential equations by finite element methods. It begins with introducing related concepts and general goals, followed by exploring computational and mathematical methods which are analytical solutions of one-dimensional Boussinesq equations and developing newer prototypes for solvers in deal.ii based on Trilinos packages. After demonstrating the methods, it indicates the reducing solving time in newer prototypes. Based on results from the prototype, similar methods are applied to update the deal.ii library. In the end, a testing program is ...
A New Data Set For Assessing The Cold Content Of The Rocky Mountain West Snowpack, 2017 University of Colorado, Boulder
A New Data Set For Assessing The Cold Content Of The Rocky Mountain West Snowpack, Jeffrey Schmidt
Undergraduate Honors Theses
Snowpack cold content (CCsnow) is the energy required to bring a snowpack to an isothermal temperature of 0.0°C. CCsnow is a snow characteristic that integrates the response of a snowpack to components of the snow-cover energy balance. An improved understanding of the spatiotemporal variability of CCsnow may provide insight into dynamics and sensitivity of the snowpack to climate change. In this study, snowpit observations of snow water equivalent (SWE), snow temperature (Tsnow) and snow density (⍴snow) from the United States Geologic Survey Rocky Mountain Snowpack Chemistry Program (USGS RMS) were used to evaluate ...
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, 2017 South Dakota State University
Impact Of Subsurface Drainage On Water Yield For Typical Soil And Weather In Eastern South Dakota, Govinda Karki
Electronic Theses and Dissertations
Subsurface drainage in agricultural land changes the field water balance by providing an alternate pathway for subsurface water. Determining the effects of subsurface drainage on downstream hydrology requires quantifying the components of the water balance. A number of studies have looked at the hydrological impacts of subsurface drainage. However, the effects are complex and difficult to generalize. The complex interaction involves the interrelation among variables such as soil type and properties, climate (rainfall and evapotranspiration), and drainage design configuration (drainage intensity and drainage coefficient), which all are local in nature. Additionally, most studies have been conducted in humid climates, whereas ...
A Geospatial Variable Rate Irrigation Control Scenario Evaluation Methodology Based On Mining Root Zone Available Water Capacity, 2017 Hastings Utilities, Hastings, NE
A Geospatial Variable Rate Irrigation Control Scenario Evaluation Methodology Based On Mining Root Zone Available Water Capacity, K. A. Miller, Joe Luck, Derek M. Heeren, T. Lo, Derrel Martin, J. B. Barker
Biological Systems Engineering: Papers and Publications
Increasing concern for sustainable water use has the agriculture industry working toward higher efficiency in use of irrigation water. Recent advancements have improved the capabilities of center pivot irrigation systems to vary water application depths across the field, a technology known as variable rate irrigation (VRI). The goal of this study was to provide a geospatial method for potential VRI technology adopters to evaluate control scenarios and potential water savings using freely available datasets. Root zone available water capacity (R) was estimated spatially across two case study fields using the Natural Resources Conservation Service Gridded Soil Survey Geographic Database. The ...
Evaluating Filter Materials For E. Coli Removal From Stormwater, 2017 South Dakota State University
Evaluating Filter Materials For E. Coli Removal From Stormwater, Ghaem Hooshyari
Electronic Theses and Dissertations
Stormwater runoff from agricultural and urban areas carries a wide range of pollutants and pathogens that can negatively affect surface water bodies and cause significant risks to the ecosystem and public health. Bacteria is one of the pollutants carried by stormwater, and Escherichia coli (E. coli) is commonly used as a microbial pollution indicator of surface water. The aim of this research was to investigate the removal of E. coli from stormwater using low-cost filter materials. Two industrial byproducts (steel slag and steel chips) and two natural minerals (zeolite and limestone) with three different sizes (0.5-1 mm, 1-2 mm ...
A Demonstration Study Of Drainage Water Management In Eastern South Dakota, 2017 South Dakota State University
A Demonstration Study Of Drainage Water Management In Eastern South Dakota, Ashik Sahani
Electronic Theses and Dissertations
Subsurface drainage is a common water management practice for improving crop production in poorly drained soils; however, the practice is associated with several environmental concerns such as nutrient losses to downstream surface waters. These environmental concerns from subsurface drainage have prompted interest in drainage water management strategies such as controlled drainage. This study assessed the agronomic and environmental impacts of drainage water management in eastern South Dakota by using two demonstration plots for controlled and conventional drainage. Drain flow, nitrate and dissolved phosphorous concentration in drain water, shallow groundwater, crop yield, residual soil nitrate, soil moisture and temperature, soil penetration ...
A Validated Tropical-Extratropical Flood Hazard Assessment For New York Harbor, 2016 Stevens Institute of Technology
A Validated Tropical-Extratropical Flood Hazard Assessment For New York Harbor, Philip M. Orton, T. M. Hall, Stefan A. Talke, Alan F. Blumberg, Nickitas Georgas, S. Vinogradov
Civil and Environmental Engineering Faculty Publications and Presentations
Recent studies of flood risk at New York Harbor (NYH) have shown disparate results for the 100 year storm tide, providing an uncertain foundation for the flood mitigation response after Hurricane Sandy. Here we present a flood hazard assessment that improves confidence in our understanding of the region's present-day potential for flooding, by separately including the contribution of tropical cyclones (TCs) and extratropical cyclones (ETCs), and validating our modeling study at multiple stages against historical observations. The TC assessment is based on a climatology of 606 synthetic storms developed from a statistical-stochastic model of North Atlantic TCs. The ETC ...
Hydraulic And Hydrologic Properties Of The Sabine River, 2016 University of Texas at Tyler
Hydraulic And Hydrologic Properties Of The Sabine River, Annie L. Bryant
Civil Engineering Theses
The Sabine River is located in Northeast Texas and is home to many threatened and endangered species as well as a growing human population. It is important to understand channel properties and flow characteristics of rivers in order better manage these important natural resources. The Sabine was monitored for hydraulic and hydrological properties as this is a poorly understood river at this point in time.
Hydraulic modeling was conducted to determine channel velocities and shear stresses during different storm frequencies. It was found that velocity and shear stress had a direct relationship at lower velocities. A comparison of existing Geographic ...
Lucidpipe™ Power System, 2016 Construction Engineering & Management, Purdue University
Lucidpipe™ Power System, Purdue Ect Team
ECT Fact Sheets
In most gravity fed water transmission pipelines, it is desired to reduce excess pressure head to prevent undue strain on a pipeline and lower the incidence of leaks. Normally this is done with pressure reducing valves that essentially burn off this excess pressure as heat. The LucidPipe™ system converts it to low cost electricity thereby removing unwanted pressure and generating energy at the same time - energy that can be put used behind the grid or put back on the grid. The LucidPipe™ system extracts a small percentage of pressure head providing nearly invisible operation allowing water operators to fulfill their ...
Exploring The Influence Of Urban Watershed Characteristics And Antecedent Climate On In-Stream Pollutant Dynamics, 2016 University of Tennessee, Knoxville
Exploring The Influence Of Urban Watershed Characteristics And Antecedent Climate On In-Stream Pollutant Dynamics, Laurel Elizabeth Christian
Understanding pollutant fate and transport in urban watersheds is a challenging endeavor, as heterogeneity of land use, precipitation patterns, and pollutant loadings add complexity to the system. As a result, many currently utilized water quality models exhibit poor performance. One main challenge in urban system modeling is the lack of quality data sets for model development, calibration, and testing, resulting in the need for high quality data collection. Although recent studies have begun to investigate pollutant transport in urban watersheds to aid these models, these studies have focused primarily on the end-of-pipe as the point of interest (i.e. prior ...
Time Series Analyst: Interactive Online Visualization Of Standards Based Environmental Time Series Data, 2016 Utah State University
Time Series Analyst: Interactive Online Visualization Of Standards Based Environmental Time Series Data, Jeffery S. Horsburgh, Amber Spackman Jones, Maurier Ramírez, Juan Caraballo
Visualization is a common need of many researchers, organizations, and projects that collect and use environmental sensor data. Web-based tools can provide screening-level visualization and data analysis functionality for users with a range of technical expertise. However, it is difficult to integrate data from multiple sources due to syntactic and semantic differences in data formats and different data delivery mechanisms that are not always interoperable. We developed an open-source time series visualization tool called the Time Series Analyst (TSA) that integrates data from multiple sources using web service interfaces and a standardized data encoding format. The TSA provides multiple types ...
A Consideration Of Hydraulic Fracturing In The United States, 2016 Rappahannock Community College
A Consideration Of Hydraulic Fracturing In The United States, Sarah Wagner
No abstract provided.