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Articles 121 - 150 of 176
Full-Text Articles in Civil Engineering
Evaluating The Ability Of Swell Prediction Models To Predict The Swell Behavior Of Excessively High Plastic Soils, Bhaskar Chittoori, Mir Md. Tamim, Amit Gajurel, Deb Mishra
Evaluating The Ability Of Swell Prediction Models To Predict The Swell Behavior Of Excessively High Plastic Soils, Bhaskar Chittoori, Mir Md. Tamim, Amit Gajurel, Deb Mishra
Civil Engineering Faculty Publications and Presentations
Lightly loaded structures underneath expansive soils encounter severe damage due to the swell/shrink nature of expansive soils resulting from moisture variations. Billions of dollars are spent every year to repair the damages caused by these soils in the U.S. and worldwide. Designing structures to accommodate the swelling strains is a major challenge as predicting the swelling potential of these soils accurately is not easy. A wide variety of swell prediction models have been introduced by various researchers to predict the behavior of these often-problematic expansive soils. These models include various properties of soils such as, plasticity characteristics, compaction conditions, consolidation …
Geotechnical Evaluations Of A Tailings Dam For Use By A Molybdenum And Copper Mine Project In Southern Idaho, Thomas Robbins, Bhaskar C.S. Chittoori
Geotechnical Evaluations Of A Tailings Dam For Use By A Molybdenum And Copper Mine Project In Southern Idaho, Thomas Robbins, Bhaskar C.S. Chittoori
Civil Engineering Faculty Publications and Presentations
A proposed mining project in Boise County, Idaho for the extraction of copper, molybdenum, and silver deposits, required investigations into a possible tailings dam construction that will be built using the processed material from the mine. The mine is located southwest of Lowman Idaho, northeast of Pioneerville Idaho, and directly north of Jackson Peak Mountain. The total area for the proposed project is approximately 12 square kilometers and the estimated material to be excavated is about 1.99 billion cubic meters (BCM) (USDA 2013). Typical investigations into the construction of a tailings dam consist of identifying the types of ore contained …
Cost-Effectiveness Of Rubber And Polymer Modified Asphalt Mixtures As Related To Sustainable Fatigue Performance, Mena I. Souliman, Michael Mamlouk, Annie Eifert
Cost-Effectiveness Of Rubber And Polymer Modified Asphalt Mixtures As Related To Sustainable Fatigue Performance, Mena I. Souliman, Michael Mamlouk, Annie Eifert
Civil Engineering Faculty Publications and Presentations
Load associated fatigue cracking is one of the major distress types occurring in flexible pavements. Flexural bending beam fatigue laboratory test has been used for several decades and is considered an integral part of the Superpave advanced characterization procedure. One of the most significant solutions to sustain the fatigue life for an asphaltic mixture is to add sustainable materials such as rubber or polymers to the asphalt mixture. A laboratory testing program was performed on three gap-graded mixtures: unmodified, Asphalt Rubber (AR) and polymer-modified. Strain controlled fatigue tests were conducted according to the AASHTO T321 procedure. The results from the …
Impact Of Image Resolution On Pavement Distress Detection Using Picucha Methodology, Reus Salini, Bugao Xu, Mena I. Souliman
Impact Of Image Resolution On Pavement Distress Detection Using Picucha Methodology, Reus Salini, Bugao Xu, Mena I. Souliman
Civil Engineering Faculty Publications and Presentations
An accurate and regular survey of the road surface distresses is a key factor for pavement rehabilitation design and management, allowing public managers to maximize the value of the continuously limited budgets for road improvements and maintenance. Manual pavement distress surveys are labor-intensive, expensive and unsafe for highly-trafficked highways. Over the years, automated surveys using various hardware devices have been developed and improved for pavement field data collection to solve the problems associated with manual surveys. However, the reliable distress detection software and the data analysis remain challenging. This study focused on the analysis of a newly-developed pavement distress classification …
Mechanistic And Economical Characteristics Of Asphalt Rubber Mixtures, Mena I. Souliman, Annie Eifert
Mechanistic And Economical Characteristics Of Asphalt Rubber Mixtures, Mena I. Souliman, Annie Eifert
Civil Engineering Faculty Publications and Presentations
Load associated fatigue cracking is one of the major distress types occurring in flexible pavement systems. Flexural bending beam fatigue laboratory test has been used for several decades and is considered to be an integral part of the new superpave advanced characterization procedure. One of the most significant solutions to prolong the fatigue life for an asphaltic mixture is to utilize flexible materials as rubber. A laboratory testing program was performed on a conventional and Asphalt Rubber- (AR-) gap-graded mixtures to investigate the impact of added rubber on the mechanical, mechanistic, and economical attributes of asphaltic mixtures. Strain controlled fatigue …
Impedance-Based Water-Quality Monitoring Using The Parallel-Plate Method, Ali Nazari, Arvin Farid, Ken Cornell
Impedance-Based Water-Quality Monitoring Using The Parallel-Plate Method, Ali Nazari, Arvin Farid, Ken Cornell
Civil Engineering Faculty Publications and Presentations
The application of electromagnetic (EM) waves to measure the electrical properties (dielectric constant and loss tangent) of materials is a well-known approach. The electrical properties can be used to indirectly measure several physical properties of solutions in water such as the concentration and chemical composition of contaminants in water, as a representative of the liquid phase in soil. A capacitive method of measuring dielectric properties of solutions is proposed to detect and determine low-concentration chemical and biological contaminations in water. The primary objective of this project is to design a low-cost sensor that would require small volumes of samples to …
Effect Of Fiber Reinforcement On Cbr Behavior Of Lime Blended Expansive Soils: Reliability Approach, Arif Ali Baig Moghal, B. Munwar Basha, Bhaskar Chittoori, Mosleh Ali Al-Shamrani
Effect Of Fiber Reinforcement On Cbr Behavior Of Lime Blended Expansive Soils: Reliability Approach, Arif Ali Baig Moghal, B. Munwar Basha, Bhaskar Chittoori, Mosleh Ali Al-Shamrani
Civil Engineering Faculty Publications and Presentations
Use of synthetic fibers as reinforcement to stabilize expansive soils is gaining momentum. As a contribution towards this growing field of research two different types of synthetic fibers, Fiber Mesh® and Fiber Cast®, were evaluated as a stabilization alternative for expansive soils in the presence of lime. California Bearing Ratio (CBR) is chosen as a performance indicator as it is a good pointer towards pavement effectiveness. Variables such as length and amount of the fibers as well as curing period were studied. Both deterministic and probabilistic (or reliability) analysis is presented in this paper. While the deterministic analysis helps in …
Performance Of Aggregate Subgrade Layers In Low Volume Roads Constructed With Unconventional Recycled Aggregates, Hasan Kazmee, Erol Tutumluer, Debakanta Mishra
Performance Of Aggregate Subgrade Layers In Low Volume Roads Constructed With Unconventional Recycled Aggregates, Hasan Kazmee, Erol Tutumluer, Debakanta Mishra
Civil Engineering Faculty Publications and Presentations
With transportation sector accounting for approximately 27% of total greenhouse gas emissions, transportation agencies all over United States have made sincere efforts to reduce such carbon footprint by incorporating more recycled materials in design mixes. In Illinois, recycled materials commonly include large sized unconventional aggregates used to stabilize weak subgrade soils that are abundantly found in wet of optimum conditions and prone to frost effects. To facilitate increased use of such “aggregate subgrade” materials, IDOT has recently introduced new gradation bands. However, performance of such recycled aggregate subgrade materials within the bounds of current design framework is largely unknown. To …
A Framework To Utilize Shear Strength Properties For Evaluating Rutting Potentials Of Unbound Aggregate Materials, Issam Qamhia, Erol Tutumluer, Liang Chern Chow, Debakanta Mishra
A Framework To Utilize Shear Strength Properties For Evaluating Rutting Potentials Of Unbound Aggregate Materials, Issam Qamhia, Erol Tutumluer, Liang Chern Chow, Debakanta Mishra
Civil Engineering Faculty Publications and Presentations
This paper presents shear strength and permanent deformation trends of four unbound aggregate materials, commonly used for base and subbase layers in the state of North Carolina, USA, studied through repeated load triaxial testing, using the University of Illinois FastCell equipment. A testing and modeling framework has been established to develop a proper permanent deformation prediction model, referred to herein as the UIUC rutting model, with number of load applications. According to the framework, the unbound aggregate shear strength properties are incorporated into the model using the ratio of the applied wheel load shear stress to the mobilized shear strength, …
Characterize Behavior Of Geogrid Reinforced Ballast At Different Levels Of Degradation Through Triaxial Shear Strength Test And Discrete Element Modeling, Yu Qian, Debakanta Mishra, Erol Tutumluer, Hasan A. Kazmee
Characterize Behavior Of Geogrid Reinforced Ballast At Different Levels Of Degradation Through Triaxial Shear Strength Test And Discrete Element Modeling, Yu Qian, Debakanta Mishra, Erol Tutumluer, Hasan A. Kazmee
Civil Engineering Faculty Publications and Presentations
Recent research efforts at the University of Illinois have aimed at studying geogrid applications in railroad track structures, specifically focusing on ballast and subballast reinforcement. Ballast, typically comprising large sized aggregate particles with uniform gradation, is an essential layer in the railroad track substructure to facilitate load distribution and drainage. The primary mechanism of load transfer within the ballast layer involves inter-particle contact between ballast particles. Similarly, the effectiveness of ballast reinforcement with geogrids is primarily governed by the geogrid-aggregate interlock. Such interaction and the effectiveness thereof can change significantly as the level of grain size and shape degradation or …
Flowability And Density Characteristics Of Controlled Low Strength Material (Clsm) Using Native High Plasticity Clay, Anand J. Puppala, Bhaskar Chittoori, Anil Raavi
Flowability And Density Characteristics Of Controlled Low Strength Material (Clsm) Using Native High Plasticity Clay, Anand J. Puppala, Bhaskar Chittoori, Anil Raavi
Civil Engineering Faculty Publications and Presentations
In pipeline construction projects when high plastic clayey soils are encountered in the excavated trench material, they are typically landfilled and better quality materials are imported from outside quarry sources for use as bedding and haunch zone materials. This practice has detrimental environmental and cost impacts; therefore, an efficient reutilization of this high plastic excavated material to produce controlled low strength materials (CLSMs) to use as bedding and haunch zone materials will have major sustainability benefits. As a part of an on-going research study, novel CLSM mix designs were developed by utilizing native high plastic clayey soils from the excavated …
Performance Evaluations Of Pavement Working Platforms Constructed With Large-Sized Unconventional Aggregates, Hasan Kazmee, Erol Tutumluer, Debakanta Mishra
Performance Evaluations Of Pavement Working Platforms Constructed With Large-Sized Unconventional Aggregates, Hasan Kazmee, Erol Tutumluer, Debakanta Mishra
Civil Engineering Faculty Publications and Presentations
With recent focus on sustainable construction practices and the ever-increasing transportation cost and scarcity of natural resources, use of unconventional aggregate materials, such as primary crusher run and concrete demolition waste, have become viable for the construction of pavement working platforms over very weak and often wet subgrade soils. To this end, a research study was undertaken at the Illinois Center for Transportation to evaluate the adequacy and field performances of such large-sized aggregate materials and validate new material specifications. A state-of-the-art image analysis technique was utilized to characterize the size and morphological properties, e.g. shape, texture and angularity of …
Uncertainty Considerations In Calibration And Validation Of Hydrologic And Water Quality Models, J. Hernandez
Uncertainty Considerations In Calibration And Validation Of Hydrologic And Water Quality Models, J. Hernandez
Civil Engineering Faculty Publications and Presentations
Hydrologic and water quality models (HWQMs) are increasingly used to support decisions on various environmental issues and policy directions for present and future scenarios, at scales varying from watershed to continental levels. Uncertainty associated with such models may affect the ability of the models to accurately evaluate the response of complex systems, leading to misguided assessments and risk management decisions. Current well-known HWQMs contain numerous input parameters, many of which are not known with certainty, and in other cases model users can hardly recognize the genesis of uncertainty. Uncertainty in data, model structure, and model parameters can propagate throughout model …
Performance Of Frp-Retrofitted Concrete Bridge Columns Under Blast Loading, R. Zheng, P. Zohrevand, H. Erdogan, Amir Mirmiran
Performance Of Frp-Retrofitted Concrete Bridge Columns Under Blast Loading, R. Zheng, P. Zohrevand, H. Erdogan, Amir Mirmiran
Civil Engineering Faculty Publications and Presentations
Contrary to military or essential government buildings, most bridges are designed without any consideration for blast resistance. Fiber-reinforced polymers (FRPs) can provide an effective means for strengthening of critical bridges against such loading. This study has focused on the effectiveness of FRP retrofitting in the dynamic response of reinforced concrete bridge columns under blast loading. Using a simplified equivalent I-section with a virtual material lumped at the two flanges; a lightly meshed uniaxial finite element model was developed and successfully validated against previous studies. The proposed model was then used for a thorough parametric study on the blast resistance of …
Predictive Models For Earthquake Response Of Clay And Sensitive Clay Slopes, Amir M. Kaynia, Gokhan Saygili
Predictive Models For Earthquake Response Of Clay And Sensitive Clay Slopes, Amir M. Kaynia, Gokhan Saygili
Civil Engineering Faculty Publications and Presentations
Earthquake-induced permanent displacement and shear strain are suitable indicators in assessing the seismic stability of slopes. In this paper, predictive models for the permanent displacement and shear strain as functions of the characteristics of the slope (e.g. factor of safety) and the ground motion (e.g. peak ground acceleration) are proposed. The predicted models are based on numerical simulations of seismic response of infinite slopes with realistic soil profiles and geometry parameters. Predictive models are developed for clay and sensitive clay slopes. A strain-softening soil model is used for sensitive clays. A comparison of the permanent displacement and strain predictions for …
Strength And Stiffness Characterization Of Controlled Low-Strength Material Using Native High-Plasticity Clay, Bhaskar Chittoori, Anand J. Puppala, Anil Raavi
Strength And Stiffness Characterization Of Controlled Low-Strength Material Using Native High-Plasticity Clay, Bhaskar Chittoori, Anand J. Puppala, Anil Raavi
Civil Engineering Faculty Publications and Presentations
A research attempt was made to design a controlled low-strength material (CLSM) mix that can be used as bedding and haunch material for a pipeline by using the native soil as fine aggregate. Several CLSM mix designs were attempted using native high-plasticity clay as fine aggregate material. Comprehensive material characterization studies including flowability to strength tests were performed. These results were analyzed to address the applicability of each mix to serve as pipe bedding/backfilling zones in a pipeline construction. Both flowability and density test results are first evaluated, and as a result, several mixes are formulated. These mixes were further …
Durability Studies On Native Soil-Based Controlled Low Strength Materials, Bhaskar Chittoori
Durability Studies On Native Soil-Based Controlled Low Strength Materials, Bhaskar Chittoori
Civil Engineering Faculty Publications and Presentations
The Integrated Pipeline Project (IPL) is a collaborative effort between the Tarrant Regional Water District (TRWD) and Dallas Water Utilities (DWU), which bring additional water supplies to the Dallas / Fort Worth area. As part of a sustainability initiative, several studies were conducted to assess the reuse potential of excavated materials along the IPL project. One of these studies involved using the excavated material as an ingredient in Controlled Low Strength Material, often known as CLSM or flowable fill. This flowable fill can be used as bedding and haunch material in pipeline construction. These CLSMs meet the specifications in the …
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Laboratory Study Of The Effect Of Electromagnetic Waves On Airflow During Air Sparging, Atena Najafi, Vahab Bolvardi, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a technique that uses the injection of a gas (e.g., air, oxygen) into the subsurface to remediate saturated soils and groundwater contaminated with volatile organic compounds (VOCs). Contaminant-removal efficiency and air-sparging performance are highly dependent on the pattern and type of airflow. Airflow, however, suffers from air channel formation (i.e., preferential paths for airflow), limiting remediation to smaller contaminated zones. This paper presents the results of experimental work investigating the possibility of controlling and improving airflow patterns through a saturated glass-bead medium using electromagnetic (EM) waves to enhance air sparging. The test setup consists of a resonant …
Electromagnetically Induced Transport In Water For Geoenvironmental Applications, Arvin Farid, Atena Najafi, Mahsa Azad, Jim Browning, Elisa Barney Smith
Electromagnetically Induced Transport In Water For Geoenvironmental Applications, Arvin Farid, Atena Najafi, Mahsa Azad, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a popular soil remediation technique that enables the removal of contaminants through diffusing air into soil. The removal process is, however, slow. The goal of this work is to study the effect of electromagnetic (EM) waves —with minimal heat generation— on transport mechanisms such as diffusion, in order to improve airflow or contaminant transport in order to expedite the cleanup process using air sparging or similar technologies. This effect is studied through an experimental setup that examines the diffusion of a nonreactive dye in water under EM waves at a range of frequencies (50-200 MHz). The electric …
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Study Of Mechanisms Governing Electromagnetic Alteration Of Hydraulic Conductivity Of Soils, Atena Najafi, Sahba Azad, Arvin Farid, Jim Browning, Elisa Barney Smith
Civil Engineering Faculty Publications and Presentations
Hydraulic conductivity is a measure of the rate at which water flows through porous media. Because of the dipole properties of water molecules, electric field can affect hydraulic conductivity. In this study, the effect of radio-frequency (RF) waves on hydraulic conductivity is investigated. This is important both for the geophysical measurement of hydraulic conductivity as well as remediation using electromagnetic waves. Bentonite clay and sandy samples are tested in rigid-wall, cylindrical permeameters and stimulated using a CPVC-cased monopole antenna vertically centered in the permeameters. The permeameters are encased within RF cavities constructed of aluminum mesh in order to prevent interference …
The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal
The Stochastic Capacity Of A Roadway: Is It The Answer For Better “Real-Time” Management Of Freeway Operations?, Mandar Khanal
Civil Engineering Faculty Publications and Presentations
Rapid growth in vehicles has been observed in many developing countries in recent years. The number of vehicles has grown but non-motorized vehicles have not disappeared. The presence of dissimilar modes of travel results in unsafe roads. Additional factors that exacerbate the traffic problem in these countries are the tendency of users to not observe traffic rules and the lax enforcement of traffic rules by law enforcement agencies. The combination of these factors can be deadly for road users. For example in India, a total of 134,513 people lost their lives to road accidents in 2010 compared to 32,885 road …
Swell And Shrinkage Strain Prediction Models For Expansive Clays, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Swell And Shrinkage Strain Prediction Models For Expansive Clays, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Civil Engineering Faculty Publications and Presentations
A comprehensive laboratory investigation was conducted to study volume change behaviors of five different types of expansive clayey soils sampled from various regions in Texas, USA. The laboratory test results, which were presented in an earlier paper, are analyzed here to evaluate existing correlations that can be used to predict swell and shrink-related displacements in these soils. The test database is also used to develop newer and practical models for predicting volume change-related soil properties. Models developed here used soil plasticity and compaction properties as independent variables. Newer models, that rely on seasonal compaction moisture content variations in the subsoils, …
Adaptive Traffic Speed Estimation, Brian Portugais, Mandar Khanal
Adaptive Traffic Speed Estimation, Brian Portugais, Mandar Khanal
Civil Engineering Faculty Publications and Presentations
Active traffic management aims to dynamically manage congestion based on existing and predicted traffic conditions. A challenge in this is that it is not usually possible to process data in real-time and use the output in control algorithms or in traveler information systems. A solution to this is to predict the traffic state based on assessments of current and past measurements. The work described in this paper develops an adaptive forecasting method to predict traffic speeds using dynamic linear models with Bayesian inference from a priori distributions. This study incorporates speeds collected from radar based sensors and validates the results …
Field Procedure For Estimating The Measurement Area Of Non-Contact Temperature Sensors, M. Khanal, R. Davidson
Field Procedure For Estimating The Measurement Area Of Non-Contact Temperature Sensors, M. Khanal, R. Davidson
Civil Engineering Faculty Publications and Presentations
Transportation departments across the United States have installed sensors mounted on towers by the roadside to measure road surface temperatures. Since no guidelines exist for verifying the accuracy of such measurements, agencies are forced to accept claims made by vendors. To correct this situation, the Idaho Transportation Department (ITD) contracted with Boise State University (BSU) to test the accuracy of the non-contact, infrared temperature sensors installed throughout Idaho. Before collecting independent temperature data, BSU devised an easy-to-use procedure for determining the effective area viewed by the infrared sensors. According to ITD, the vendor claimed that at a distance of 10 …
Swell And Shrinkage Characterizations Of Unsaturated Expansive Clays From Texas, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Swell And Shrinkage Characterizations Of Unsaturated Expansive Clays From Texas, Anand J. Puppala, Thammanoon Manosuthikij, Bhaskar C. S. Chittoori
Civil Engineering Faculty Publications and Presentations
Expansive soils have long been recognized as problematic because they cause failure to civil structures constructed above them. The main problem of these soils can be attributed to poor understanding of the volume changes caused by moisture fluctuations. Current swell and shrinkage characterization models are limited by both the lack of standardized tests and tests that employ volume changes in uniaxial direction. In the present research, a comprehensive laboratory investigation was undertaken to study the volume change related swell–shrinkage behaviors of five different types of expansive clayey soils sampled from various regions in Texas, USA. Extensive experimental programs consisting of …
Design And Performance Of A Skid-Mounted Portable Compartment Fire Gas Furnace And Monitoring System, K. Mueller, Y. Kurama, M. Mcginnis, M. Lisk
Design And Performance Of A Skid-Mounted Portable Compartment Fire Gas Furnace And Monitoring System, K. Mueller, Y. Kurama, M. Mcginnis, M. Lisk
Civil Engineering Faculty Publications and Presentations
A custom, portable natural gas fire furnace was designed and constructed for use at the University of Notre Dame to experimentally investigate the out-of-plane behavior of full-scale reinforced concrete (RC) bearing walls under fire. The unique aspects of this furnace allowed the application of large mechanical loads and non-contact optical response monitoring to be done while subjecting the wall to elevated temperatures. The performance of the experimental furnace, mechanical loading, and response monitoring system is reported using the results from the first two RC wall test specimens.
Consequences Of Electromagnetic Stimulation On Hydraulic Conductivity Of Soils, A. Farid, S. Azad, J. Browning, Elisa H. Barney Smith
Consequences Of Electromagnetic Stimulation On Hydraulic Conductivity Of Soils, A. Farid, S. Azad, J. Browning, Elisa H. Barney Smith
Civil Engineering Faculty Publications and Presentations
Hydraulic conductivity is a measure of the rate at which water flows through porous media. Because of the dipole properties of water molecules, any electric field can affect hydraulic conductivity. In this study, the effect of radio-frequency (RF) waves on hydraulic conductivity is investigated. This is important both for the geophysical measurement of hydraulic conductivity as well as remediation using electromagnetic waves. Bentonite clay and sandy samples are tested in rigid-wall, cylindrical permeameters and stimulated using a CPVC-cased monopole antenna vertically centered in the permeameters. The permeameters are encased within RF cavities constructed of aluminum mesh in order to prevent …
Electromagnetic Stimulation Of Transport In Water For Geoenvironmental Applications, A. Farid, M. Azad, J. Browning, Elisa H. Barney Smith
Electromagnetic Stimulation Of Transport In Water For Geoenvironmental Applications, A. Farid, M. Azad, J. Browning, Elisa H. Barney Smith
Civil Engineering Faculty Publications and Presentations
Air sparging is a popular soil remediation technique that enables the removal of contaminants by diffusing air into saturated zones of soil. The removal process is, however, slow. The goal of this work is to study the effect of electromagnetic (EM) waves - with minimal heat generation - on transport mechanisms such as diffusion, in order to improve airflow or contaminant transport and expedite the cleanup process using air sparging or similar technologies. This effect is studied through an experimental setup that examines the diffusion of a nonreactive dye in water under EM waves at a range of frequencies between …
Explaining The Hydroclimatic Variability And Change In The Salmon River Basin, Venkataramana Sridhar, Xin Jin, W. Thilini Jaksa
Explaining The Hydroclimatic Variability And Change In The Salmon River Basin, Venkataramana Sridhar, Xin Jin, W. Thilini Jaksa
Civil Engineering Faculty Publications and Presentations
Climate change in the Pacific Northwest and in particular, the Salmon River Basin (SRB), is expected to bring about 3–5 °C rise in temperatures and an 8 % increase in precipitation. In order to assess the impacts due to these changes at the basin scale, this study employed an improved version of Variable Infiltration Capacity (VIC) model, which includes a parallel version of VIC combined with a comprehensive parameter estimation technique, Shuffled Complex Evolution (SCE) to estimate the streamflow and other water balance components. Our calibration (1955–1975) and validation (1976–1999) of the model at the outlet of the basin, White …
Groundwater Levels In Northern Texas High Plains: Baseline For Existing Agricultural Management Practices, Jairo E. Hernández, Prasanna H. Gowda, Thomas H. Marek, Terry A. Howell, Wonsook Ha
Groundwater Levels In Northern Texas High Plains: Baseline For Existing Agricultural Management Practices, Jairo E. Hernández, Prasanna H. Gowda, Thomas H. Marek, Terry A. Howell, Wonsook Ha
Civil Engineering Faculty Publications and Presentations
New groundwater policies are being debated for the Northern Texas High Plains because of Ogallala Aquifer depletion. These policies should be evaluated using a calibrated groundwater model for assessing their impact on subsequent groundwater levels. The objective of this study was to calibrate and validate a regional groundwater model for predicting the impact of existing agricultural management practices on groundwater levels beneath 4 counties located in the Northern Texas High Plains. Results indicated that the MODFLOW-2000 groundwater model was calibrated and validated satisfactorily based on reproducing and comparing groundwater levels with coefficients of determination of 0.97 and 0.98, root mean …