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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Modeling Technique For Optimal Recovery Of Immiscible Light Hydrocarbons As Free Product From Contaminated Aquifer, Grant S. Cooper Jr., Richard C. Peralta, Jagath J. Kaluarachchi
Modeling Technique For Optimal Recovery Of Immiscible Light Hydrocarbons As Free Product From Contaminated Aquifer, Grant S. Cooper Jr., Richard C. Peralta, Jagath J. Kaluarachchi
Civil and Environmental Engineering Faculty Publications
Contamination sites associated with light non-aqueous phase liquids {LNAPL) are numerous and represent difficult cleanup problems. Remediation methods for cleanup of LNAPL fluids in subsurface systems are continuously evolving with the development of various technologies for pump.-and~treat, soil venting, and in-situ bioremediation. Evaluating the effectiveness of remediation techniques as well as attempting to improve their efficiency has been a focus of many researchers, These efforts have included the development of computer simulation models to predict and analyze the fluid movement, entrapment, and mobilization of three~phase systems in porous media. The capability of computer models that not only simulate but optimize …
S/O Modeling Technique For Optimal Containment Of Light Hydrocarbons In Contaminated Unconfined Aquifers, Grant S. Cooper Jr., Jagath J. Kaluarachchi, Richard C. Peralta
S/O Modeling Technique For Optimal Containment Of Light Hydrocarbons In Contaminated Unconfined Aquifers, Grant S. Cooper Jr., Jagath J. Kaluarachchi, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
An innovative approach is presented to minimize pumping for immobilizing a floating plume of a light non-aqueous phase liquid (LNAPL). The best pumping strategy is determined to contain the free oil product and provide for gradient control of the water table. This approach combined detailed simulation, statistical analysis, and optimization. This modeling technique uses regression equations that describe system response to variable pumping stimuli. The regression equations were developed from analysis of systematically performed simulations of multiphase flow in an areal region of an unconfined aquifer. Simulations were performed using ARMOS, a finite element model. ARMOS can be used simulate …
Review Of Planning Distribution Model (Pdm) Status And Application Possibilities For The Egyptian Irigation System, Robert W. Hill, Richard C. Peralta, Gary P. Merkley
Review Of Planning Distribution Model (Pdm) Status And Application Possibilities For The Egyptian Irigation System, Robert W. Hill, Richard C. Peralta, Gary P. Merkley
Civil and Environmental Engineering Faculty Publications
The comprehensive water management Planning Distribution Model, or PDM, was developed by the Biological and Irrigation Engineering Department, Utah State University (USU), under contract with the United States Bureau of Reclamation (USBR). Most of the work was carried out in the Planning Sector, Ministry of Public Works and Water Resources (MPWWR) , in Cairo, under the Planning Studies and Models Component of the USAID funded Irrigation Management Systems Project.
Optimal Contaminant Plume Management With Us/Wells, Alaa H. Aly, Richard C. Peralta
Optimal Contaminant Plume Management With Us/Wells, Alaa H. Aly, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
A micro-computer based software package developed at utah State University for computing optimal pumping strategies for well systems (US/WELLS) is demonstrated. US/WELLS is used to determine the optimal time-varying sequence of extraction and injection rates when only limited data is available. The software determines the extraction/injection rates, in pre-specified locations, needed for immobilizing and/or extracting a groundwater contaminant plume. In the optimization problem, the objective function can be either to minimize the extraction/injection rates needed {linear) or to minimize the hydraulic power used for lifting water (quadratic). In either case, different weights can be assigned to emphasize any time period. …
Optimizing Conjunctive Water Use In A Dynamic Stream Aquifer System, Getachew Belaineh, Richard C. Peralta
Optimizing Conjunctive Water Use In A Dynamic Stream Aquifer System, Getachew Belaineh, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
Long-term water management planning models frequently use large time steps and must employ fairly crude assumptions (such as average climatic conditions, etc.). Managing stream aquifer systems during a dry season requires using finer discretization in time and space. Presented is a computer model, US/REMAX, developed by Utah State University personnel for aiding best management of stream-aquifer systems for both long and short eras. The model computes strategies for optimally allocating surface and ground water resources in time and space. For a water supply problem the model can maximize the sum of delivered surface and ground water. For an environmental protection …
Optimizing Irrigation Management For Pollution Control And Sustainable Crop Yield, G. R. Musharrafieh, Richard C. Peralta
Optimizing Irrigation Management For Pollution Control And Sustainable Crop Yield, G. R. Musharrafieh, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
We developed a simulation-optimization model which maximizes crop yield while maintaining target salt concentration in the root zone, and/ or preventing salt from leaching to the groundwater. The model performs nonlinear optimization and simulation. Implicit finite difference forms of the nonlinear, transient, unsaturated water flow equation, and the convection-diffusion equation are embedded as constraints. Other constraints include nonlinear functions describing the hydraulic properties of the medium. The objectives of the management model is to develop irrigation strategies which prevent salt leaching to the groundwater when salty irrigation water is used. Five different irrigation strategies are developed for Huntington Research Farm, …
Practical Optimization Modeling For Contaminant Plume Management, Richard C. Peralta, Alaa H. Aly
Practical Optimization Modeling For Contaminant Plume Management, Richard C. Peralta, Alaa H. Aly
Civil and Environmental Engineering Faculty Publications
Simulation/optimization (S/0) models can be used to greatly speed the process of computing desirable groundwater pumping strategies for plume management. They make the process of computing optimal strategies fairly straightforward and can help minimize the labor and cost of groundwater contaminant clean-up.
Candi (Chemical And Irrigation Management) Users Manual, Vs 2.0., A. H. Aly, Richard C. Peralta
Candi (Chemical And Irrigation Management) Users Manual, Vs 2.0., A. H. Aly, Richard C. Peralta
Civil and Environmental Engineering Faculty Publications
This manual describes an interactive computer model, CANOl. CANOl is a decision support tool designed to aid in on-farm pesticides and irrigation management. CANOl simulates downward chemical movement through the soil in response to different irrigation practices. CANOl estimates the relative amount of a non-polar organic chemical which remains in the soil profile by the time it reaches a specified depth. Future releases of CANOl will involve the management of different types of chemicals. CANOl is also able to delineate the wellhead protection areas for domestic wells. For this purpose, CANOl involves USEPA's model (MWCAP). Different versions of CANOl handle …
Best Management Of Pesticide And Irrigation Application Systems: Background And Candi Software, Alaa H. Aly, Richard C. Peralta, Howard M. Deer
Best Management Of Pesticide And Irrigation Application Systems: Background And Candi Software, Alaa H. Aly, Richard C. Peralta, Howard M. Deer
Civil and Environmental Engineering Faculty Publications
In this chapter, we discuss a commonly-used volume balance approach for simulating the movement of water through the root zone. We then show how this approach can be coupled with pesticide leaching prediction. Finally we show how information about irrigation system design can be used with the previous processes. The result is an integrated approach for estimating the environmental consequences of irrigation and pesticide management.