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Simulation
| AQUA TERRA Consultants - HYDROLOGICAL SIMULATION PROGRAM - FORTRAN
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The Hydrological Simulation Program-FORTRAN, known as HSPF, is a mathematical model developed under EPA sponsorship for use on digital computers to simulate hydrologic and water quality processes in natural and man-made water systems. It is an analytical tool which has application in the planning, design, and operation of water resources systems. The model enables the use of probabilistic analysis in the fields of hydrology and water quality management. HSPF uses such information as the time history of rainfall, temperature, evaporation, and parameters related to land use patterns, soil characteristics, and agricultural practices to simulate the processes that occur in a watershed. The initial result of an HSPF simulation is a time history of the quantity and quality of water transported over the land surface and through various soil zones down to the groundwater aquifers. Runoff flow rate, sediment loads, nutrients, pesticides, toxic chemicals, and other quality constituent conce
Submitted Mar 29, 2000
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| Technical Details About The Simulation
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The simulation is a fairly simple FORTRAN program front-ended by an HTML form. John Rowe's Metaform system processes the submitted form, identifying and substituting variables. It is this mechanism that updates the sentence about the set-point program so that it describes the times and settings correctly. The browser reads the processed form and, by loading the graph, activates a second Perl script called Metagraph. Metagraph pipes parameter values from the form into the FORTRAN simulation code and passes the output to GNUPLOT which generates HPGL. This is converted to the GIF format to be displayed by the browser.
Submitted Mar 29, 2000
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| Introduction to BSIM
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BSIM is a software package (i.e., a set of computer programs) designed to help develop ecosystem models. It is based on the idea that it is relatively easy to translate scientific concepts into a computer simulation model if you don't have to worry about the technical details that programming entails... All the complicated stuff which Fortran insists on is handled by BSIM system software; this includes subroutines for input, output, data manipulation, plotting, integration, and so on, as well as compilation, loading, and other machine-dependent processes.
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| GAIA Model Base HSPF
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The Hydrological Simulation Program - FORTRAN (HSPF) is a comprehensive package for simulation of watershed hydrology and water quality for both conventional and toxic organic pollutants. HSPF incorporates the watershed-scale ARM and NPS models into a basin-scale analysis framework that includes fate and transport in one-dimensional stream channels. It is the only comprehensive model of watershed hydrology and water quality that allows the integrated simulation of land and soil contaminant runoff processes with in-stream hydraulic and sediment-chemical interactions.
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| HSPF-History and Description
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HSPF is a comprehensive, conceptual, continuous watershed simulation model designed to simulate all the water quantity and water quality processes that occur in a watershed, including sediment transport and movement of contaminants. Although it is usually classified as a lumped model, it can reproduce spatial variability by dividing the basin in hydrologically homogeneous land segments and simulating runoff for each land segment independently, using different meteorologic input data and watershed parameters. The model includes fitted parameters as well as parameters that can be measured in the watershed.
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| Vassilis Hajivassiliou
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Fortran routines for simulating rectangle multivariate normal probabilities and derivatives.
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| ABSTRACT: AN ADVANCED CONTROL METHOD FOR THE THERMOPLASTIC TOW PLACEMENT SYSTEM
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This research is focused on developing an on-line control technique that is fast and reliable and can be used to maximize the performance of the tow placement technique. The thermoplastic tow placement is an emerging manufacturing technology that gives more flexibility in the design of parts and in cost reduction through on-line consolidation compared with autoclave processing. A control method is required to take advantage of these features. Therefore, recently developed process models are integrated into a neural-network based optimization package, which is capable of locating optimum setpoints in minimal time. A control algorithm with feedback from an IR thermal camera has been developed and is used to achieve the desired surface temperature. A feedforward neural network with a cascadien architecture is used to simulate the process. Simulation computations are now possible in less than a second, compared to around 20 minutes for the original FORTRAN simulation. This allows runn
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