| Quantifying the Complex Hydrologic Response of a Desert Ephemeral Wash |
19 APR 2011 |
57 pages |
| Authors:
Susan Howe; Jorge A. Ramirez; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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 | The objective of this research is to increase current understanding of drylands hydrology by quantifying the hydrologic response of two geomorphic surfaces in an ephemeral wash to seasonal precipitation inputs. Specifically, the aim is to understand how water is partitioned in space and time across these geomorphic surfaces, and the associated soil and vegetative response to seasonal precipitation. The physiogeographic region of study is Yuma Wash, a hyperarid watershed located ... |
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| Real-Time Detection of Intentional Chemical Contamination in the Distribution System |
23 FEB 2005 |
34 pages |
| Authors:
David E. Byer; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| Currently, the first casualties after an intentional contamination event will be identified by physicians or other health care providers due to the onset of symptoms well after exposure. One approach to mitigating this potential disaster includes on-line monitoring of drinking water distribution systems. Four credible threat drinking water contaminants (aldicarb, sodium arsenate, sodium cyanide, and sodium fluoroacetate) were added to tap water and analyzed at different concentrations to determine their ... |
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| Sequential Electrolytic Degradation of Energetic Compounds in Groundwater |
12 Nov 2004 |
81 pages |
| Authors:
Dave Gilbert; Tom Sale; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| In 2002, SERDP funded CSU to conduct proof of concept studies to evaluate sequential electrolytic degradation of energetic compounds using flow through electrolytic reactors (e-barriers). In 2003, SERDP provided supplemental funding for a more detailed analysis of reaction mechanisms and products. This report includes detailed results from these efforts. The results from the first phase suggest that e-barriers are a promising option for treatment of energetic compounds in groundwater. Specifically, ... |
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| Experimental Investigation of Tearing Fracture in Sheets Under Quasi- Static Loading |
JUN 2004 |
79 pages |
| Authors:
Michael L. Roach; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| Although there has been interest in the behavior of metal plates under blast and projectile loading for many years, definitive open-source analysis has only been recently forthcoming. This analysis is most often in the form of scaled recreations of the dynamic blast event, or "live fire" tests. New developments in methods of recreating blast and projectile induced plate failure using a quasi-static approach provide possible, accurate, alternatives to the cumbersome ... |
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| Utilizing Routine Water Quality Instruments for Monitoring Distribution System Security |
2004 |
193 pages |
| Authors:
David E. Byer; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| Drinking water system security concerns have been a considerable issue in the United States in recent years, but in the last two years this issue has risen to new levels of urgency. The tragic events of September 11th highlighted America's vulnerability to terrorism and spurred a domestic security response unprecedented since World War II. Currently, significant purposeful contamination of a water system won't be properly characterized until post- symptomatic epidemiological ... |
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| Demonstration Erosion Control Project Monitoring Program. Volume 6. Appendix E. Expeditious Design and Review of Pipe-Drop Drainage Features |
JUN 93 |
31 pages |
| Authors:
Chester C. Watson; Steven R. Abt; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The purpose of monitoring the Demonstration Erosion Control (DEC) project is to evaluate and document watershed response to the implemented DEC project. Documentation of watershed responses to DEC Project features will allow the participating agencies a unique opportunity to determine the effectiveness of existing design guidance for erosion and flood control in small watersheds. The monitoring program includes 11 technical areas: stream gaging, data collection and data management, hydraulic performance ... |
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| Long-Range Forecasting of Storminess Over the Northern Hemisphere oceans |
JAN 89 |
12 pages |
| Authors:
Elmar R. Reiter; Bruce C. MacDonald; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The focus of this research was directed toward 'heavy weather at sea' specifically to marine 'bombs' and their predictability. The approach involved analyses of bombs which occur overland, in order to determine the key signatures of bomb development. The two were: 1) A comprehensive diagnostic effort aimed at examining the nature of explosive cyclogenesis, including a comparison of bombs and nonexplosive, or regular, cyclones. The generation of vorticity, divergence, and ... |
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| Digital Operational Management Model of the North Boundary Barrier System at the Rocky Mountain Arsenal Near Denver, Colorado (Groundwater Technical Report Number 16) |
OCT 88 |
220 pages |
| Authors:
James W. Warner; Gregory J. Ward; Donald M. Dwight; Daniel B. Carr; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The purpose of this study was to construct, calibrate, and verify a digital ground water model for use as an operational management and design tool for the north boundary containment treatment system. Calibration consisted of development of the predictive capabilities of the model by interactively refining the model parameters to closely approximate observed pre-barrier ground water conditions. The model was further refined by replication of historical barrier system operation and ... |
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| Blast Induced Liquefaction of Soils: Laboratory and Field Tests |
25 JUN 88 |
198 pages |
| Authors:
Wayne A. Charlie; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| Our field, laboratory and theoretical research indicate that the destruction potential of an explosion may be greatly magnified if detonated in water saturated granular soils. While blast-induced liquefaction may not necessarily damage a facility structurally, it may render it unusable. Empirical models are given that can be used to estimate liquefaction potential as a function of density, effective stress and applied compressive strain. One of the models uses an empirical ... |
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| Blast Induced Liquefaction Instrumentation |
29 JUN 87 |
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| Authors:
Wayne A. Charlie; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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 | The instrumentation and equipment purchased under the 'DOD-University Research Instrumentation Program' is currently being used to support AFOSR funded field research on Explosive Induced Liquefaction of Soils. The instrumentation is being used to provide high speed transient data acquisition of stress, water pressure, acceleration, data storage, data reduction, and test documentation to permit development of analytical, theoretical, and empirical models of the phenomena. Keywords: Blast explosive induced liquefaction; Shock test. ... |
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| Parameterization of Stage Frequency through Physically-Based Stochastic Modeling for Ungaged Basins |
APR 87 |
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| Authors:
H. W. Shen; J. T. Obeysekera; G. Q. Tabios III; L. Cadavid; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| A complete hydraulic routing model for watershed runoff based on flood routing technique of kinematic wave approach for overland flow and channel flow is developed. Physically-based geomorphologic expression for hydrograph characteristics of ungaged watersheds are derived. A comparison limited to a set of contrived watersheds with the existing methods available in the literature has revealed that the new expressions predict the hydrograph characteristics with much improved accuracy than the existing ... |
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| Digital Operational Management Model of Northwest Boundary Barrier System at the Rocky Mountain Arsenal Near Denver, Colorado |
OCT 86 |
115 pages |
| Authors:
J. Warner; D. Walker; G. Ward; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The U.S. Army's Rocky Mountain Arsenal is a former chemical munitions production facility near Denver, Colorado. Past activities have contaminated a shallow alluvial aquifer at the arsenal. Subsequent clean up efforts have included the construction of three groundwater contaminant containment barriers along the north and northwest boundaries of the arsenal. These groundwater barriers consist of pumping and injection well arrays separated by clay-slurry walls. Arsenal personnel have found these barrier ... |
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| Blast Induced Liquefaction Potential and Transient Porewater Pressure Response of Saturated Sands |
15 OCT 85 |
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| Authors:
Wayne A. Charlie; George E. Veryera; Donald O. Doehring; Steven R. Abt; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| An experimental apparatus was developed to investigate transient and long-term porewater pressure responses of saturated soils. The facility is capable of generating compressive shock loadings on the order of 35000 KPa with millisecond rise times to peak stress. This investigation represents an effort to examine and establish an understanding of compressionally-induced liquefaction. Samples of water saturated Monterey No. 0/30 sand were examined at various relative densities and effective stresses. Boundary ... |
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| Wind-Tunnel Research on the Mechanics of Plumes in the Atmospheric Surface Layer |
DEC 84 |
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| Authors:
J. E. Cermak; P. K. Shrivastava; M. Poreh; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The diffusion of a neutrally buoyant gas emitted from point sources into neutral, stable, and unstable boundary layers that simulated atmospheric conditions were studied in a meteorological wind tunnel for flow over two surface roughnesses. Measurements were made of the mean flow velocities and temperatures, turbulence intensities, velocity correlations, and gas concentrations in the diffusing plume. Empirical models were developed for predicting diffusion under all three stabilities studied. (Author). ... |
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| Application of Streamtube Computer Model to Lock and Dam Number 26 (Replacement) Project |
OCT 1983 |
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| Authors:
A. Molinas; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| This report is a study of the prevailing hydraulic and sediment transport conditions at the Lock and Dam No. 26 (Replacement) site for the Stage I cofferdam, and the estimation of future river Channel response to the Stage II cofferdam. It utilizes the Streamtube Computer Model, which was originally developed by Dr. Albert Molinas at Colorado State University for the U.S. Bureau of Reclamation (January 1983) and which was subsequently ... |
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| Hydraulic Testing of Plastic Filter Fabrics |
SEP 1981 |
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| Authors:
Yung Hai Chen; Daryl B. Simons; Phillip M. Demery; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The hydraulic characteristics of nonwoven filter filters were investigated using a laboratory permeameter to simulate a soil/fabric subsurface drainage system. By utilizing information of discharge, pressure, permeability, and filter properties, conclusions were drawn concerning the correlation between the soil and the plastic filters. In sands with large concentrations of fine particulate, the migration of the fines was minimal, and the soil controlled the hydraulic response of the system regardless of ... |
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| Planning of a Demonstration Project for Main Channel Disposal of Dredged Material. |
JUL 1980 |
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| Authors:
D. B. Simons; Y. H. Chen; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| This report describes a plan for establishing a demonstration project for main channel disposal of dredged material in the Upper Mississippi River. Different tracer methods for tracking the movement of dredged material disposed on the thalweg were reviewed. A suitable tracer method for this purpose was identified. Then a plan for establishing a demonstration project for main channel disposal of dredged material was developed. |
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| Blast Induced Liquefaction Potential. Influence of Unsaturated Conditions. |
26 SEP 1979 |
32 pages |
| Authors:
Wayne A. Charlie ; Joseph P. Martin; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The phenomenon called blast induced liquefaction is examined. Blast induced ground motions which may cause liquefaction are categorized on the basis of wave form characteristics and motion types and compared to earthquake groundmotions. Prediction methods used in Russia, Europe and North America are reviewed. The influence of field tests on unsaturated subsurface soils in respect to liquefaction potential, porewater pressure increase, porewater pressure measurement, shock wave velocity and scaling factors ... |
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| Wind Characteristics over Subic Bay, Philippine Islands, during Typhoon Passage -- Determination by Physical Modeling in a Meteorological Wind Tunnel. |
OCT 1978 |
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| Authors:
H. G. C. Woo; J. E. Cermak; J. J. Lou; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| A simulated atmospheric boundary-layer flow over a 1:15,000 scale model of the Subic Bay Basin, Philippines, was studied in the environmental wind tunnel of the Fluid Dynamics and Diffusion Laboratory, Colorado State University. Surface flow patterns were obtained by visualization with smoke and surface oil films. Mean wind speed isotachs and turbulence intensity contour lines were obtained at four elevations of 70, 150, 195 and 275 ft (21.3, 45.7, 59.5 ... |
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| Criteria for a Laboratory Research Facility to Study Wind Effects in Coastal Engineering Problems. |
Nov 1973 |
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| Authors:
James B Bole; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The report discusses experimental design criteria that influences the selection of specifications for a coastal engineering research laboratory suitable for investigations involving wind effects. A brief summary is given of deep water, shallow water, and beach experiments that may be conducted in the facility. General considerations in the design of water channels and wind tunnels are also presented. Preliminary design ideas are illustrated. |
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| Design and Testing of a Blast-Resistant Reinforced Concrete Slab System. |
NOV 1972 |
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| Authors:
Marvin E. Criswell; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The objectives of the investigation were to design and model test a blast-resistant reinforced concrete slab system serving as the roof of a basement shelter area. The slab system was designed to offer sufficient radiation and blast protection to insure a survival probability for its occupants of 85 to 95 percent for a fa 15-psi airblast overpressure loading. Static and dynamic tests were conducted on two 1/4-scale models of a ... |
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| Analysis of Deep Water Single Point Moorings |
AUG 1970 |
102 pages |
| Authors:
John H. Nath; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| Analytical and numerical studies were made of single point moorings of a large disc buoy in deep water. Waves of different frequencies and winds of different magnitudes were imposed on moorings of different scopes for nylon ropes. The numerical model results compared favorably with analytical solutions for a straight vibrating string and the buoy motion was validated with the results from a hydraulic model study. Approximate calculations, based on the ... |
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| FORCES AND MOMENTS ON A RESTRAINED MODEL IN REGULAR WAVES. |
MAR 1961 |
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| Authors:
E. F. Schulz; COLORADO STATE UNIV FORT COLLINS DEPT OF CIVIL ENGINEERING
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| The report presents the experimental forces and moments acting on a five-foot model tanker when it was towed on five headings in a regular seaway. The seaway consisted of regular deep-water waves whose length varied from 0.5 to 2.0 times the model length. The wave steepness was varied from 1/40 to 1/20 height-length ratio. All motions of the model except uniform forward translation were restrained and the forces and moments ... |
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