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1993

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Articles 91 - 120 of 492

Full-Text Articles in Civil and Environmental Engineering

Optimizing Irrigation Management For Pollution Control And Sustainable Crop Yield, G. R. Musharrafieh, Richard C. Peralta Jul 1993

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, …


Breaking Wave Spectrum And Set-Down Set-Up In Shallow Water, W.H. Yang Jun 1993

Breaking Wave Spectrum And Set-Down Set-Up In Shallow Water, W.H. Yang

Journal of Marine Science and Technology–Taiwan

To study the mean water surface in the shallow water, it is necessary to compute the wave set-up and set-down of random waves on the surf zone. Therefore, the breaking wave spectra and radiation stress must be calculated from a wide-band breaking wave model. In this study, we extend the breaking wave spectrum model (Yang, 1991) by using the Wallops spectrum in the deep water. The Wallops spectrum is based on wave dynamics theoretical analysis and no empirical coefficients to be determined by the users. It also contents correct energy (Huang et al., 1981). The breaking wave spectra, radiation stress, …


The Naval Reserve Civil Engineer Corps Environmental Engineering Program, William A. Heine, Samuel A. Vigil Jun 1993

The Naval Reserve Civil Engineer Corps Environmental Engineering Program, William A. Heine, Samuel A. Vigil

Civil and Environmental Engineering

The Navy is engaged in a national effort to bring its shore facilities into compliance with all applicable local, state, and federal environmental regulations. This work is being completed by civil service employees, consultants, and contractors under the supervision of Navy Civil Engineer Corps officers. To supplement these active duty and civilian resources, the Reserve Division of the Naval Facilities Engineering Command (RDNAVFAC) has identified Reserve officers with substantial environmental engineering skills who are being assigned to assist Navy shore activities all over the world in this essential task. The Naval Reserve Civil Engineer Corps (CEC) is composed of over …


Predicting Seepage Of Leachate From The St. Johns Landfill To Ground And Surface Water Systems, Kevin A. Schock Jun 1993

Predicting Seepage Of Leachate From The St. Johns Landfill To Ground And Surface Water Systems, Kevin A. Schock

Dissertations and Theses

Determination of the vertical and horizontal groundwater hydraulic gradient within a landfill is the first step in determining the potential of groundwater contamination from the landfill leachate. The length of a study and the frequency at which measurements are recorded can greatly affect the description of the local groundwater environment. A more comprehensive analysis can be preformed for longer periods of study and greater measurement frequency. The intent of this study was to install a continuous groundwater level monitoring system around the st. Johns Landfill for a minimum study length of one year. This would allow a more thorough study …


Preliminary Design Guide For Cold-Formed Steel C- And Z-Members, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members Jun 1993

Preliminary Design Guide For Cold-Formed Steel C- And Z-Members, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.


Conference Speakers, Multiple People Jun 1993

Conference Speakers, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Author Index Volume I And Ii, Multiple Authors Jun 1993

Author Index Volume I And Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Meet Our Authors, Multiple Authors Jun 1993

Meet Our Authors, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Meeting Minutes Of The Organizing And Steering Committees, Multiple Members Jun 1993

Meeting Minutes Of The Organizing And Steering Committees, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


List Of Conference Participants, Multiple Participants Jun 1993

List Of Conference Participants, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Banquet Speeches, Multiple Authors Jun 1993

Banquet Speeches, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Table Of Contents - Vol. I, Multiple Authors Jun 1993

Table Of Contents - Vol. I, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Table Of Contents - Vol. Ii, Multiple Authors Jun 1993

Table Of Contents - Vol. Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors Jun 1993

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. I, Multiple Authors Jun 1993

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. I, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Conference Schedule, Multiple Participants Jun 1993

Conference Schedule, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Analysis Of Small Pipe Piles Using The Field Vane, G. A. Miller, A. J. Lutenegger Jun 1993

Analysis Of Small Pipe Piles Using The Field Vane, G. A. Miller, A. J. Lutenegger

International Conference on Case Histories in Geotechnical Engineering

Results of axial compressive load tests on three small diameter pipe piles driven in a varved clay deposit are presented. Predictions of the axial pile capacity were made using the a-method originally proposed by Tomlinson (1957, 1971) and incorporating undrained strength profiles determined with the field vane. Predicted and measured capacities are compared and discussed in light of the various factors which can affect the outcome such as vane geometry, vane testing procedure and interpretation, pile load testing conditions, and empirical relationships incorporated in predictions.


Bearing Capacity And Load-Displacement Behavior Of Rigid Pads On Soft, Sensitive, Clay, R. J. Jardine, B. M. Lehane, P. R. Smith, P. A. Gildea Jun 1993

Bearing Capacity And Load-Displacement Behavior Of Rigid Pads On Soft, Sensitive, Clay, R. J. Jardine, B. M. Lehane, P. R. Smith, P. A. Gildea

International Conference on Case Histories in Geotechnical Engineering

The paper describes tests on rigid square pads at the UK national soft clay research site at Bothkennar, Scotland. The work was performed as a low cost adjunct to the instrumented pile research described by Lehane and Jardine (1992). Its aims were to investigate (i} bearing capacity, (ii) load-displacement response to short and long term loading, (iii) the applicability of relevant theories and (iv) relationships between soil properties determined in-situ and those measured in high quality laboratory tests.


Behavior Of Laterally Loaded Drilled Shafts In Stiff Soil, A. J. Lutenegger, G. A. Miller Jun 1993

Behavior Of Laterally Loaded Drilled Shafts In Stiff Soil, A. J. Lutenegger, G. A. Miller

International Conference on Case Histories in Geotechnical Engineering

Results of lateral load tests on four drilled shafts installed in stiff cohesive soil are presented. Predictions of the load/displacement behavior were made using p-y curves generated from the results of Prebored Pressuremeter and Dilatometer Tests. A new method to develop p-y curves from the DMT is presented and discussed.


Caisson Foundations For Cellular Telephone Monopoles, Donald A. Benvie, Jeffrey B. Kirby Jun 1993

Caisson Foundations For Cellular Telephone Monopoles, Donald A. Benvie, Jeffrey B. Kirby

International Conference on Case Histories in Geotechnical Engineering

Design and construction procedures that were implemented for the installation of caisson foundations to support cellular telephone monopoles at fifteen sites throughout metropolitan New York are presented herein. Subsurface investigation procedures, development of geotechnical design criteria, methods of structural analysis and caisson design, and actual construction installation of the caissons have been provided along with a comparison of soil conditions and their impact on design and construction of the caissons.


Case Histories Of Bored Pile Foundations, T. Z. Rao Jun 1993

Case Histories Of Bored Pile Foundations, T. Z. Rao

International Conference on Case Histories in Geotechnical Engineering

A kind of bored pile with large diameter is being used in civil engineering in China. The maximum length in earth of the pile is greater than 100 m. This pile may be built in rock. In the paper, the constructing methods of the bored pile foundation of a bridge and a grade separation are described. Relating the result with its cause, the failure of the bored pile in construction, the cause of the failure and the treatment methods are related.


General Report Session No. 1: Case Histories Of Foundations, Roy E. Olson, J. H. Long, R. Jardine, Yudhbir Jun 1993

General Report Session No. 1: Case Histories Of Foundations, Roy E. Olson, J. H. Long, R. Jardine, Yudhbir

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors Jun 1993

Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.


Concluding Session, Y. Iwasaki Jun 1993

Concluding Session, Y. Iwasaki

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors Jun 1993

Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors Jun 1993

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain Jun 1993

Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain

International Conference on Case Histories in Geotechnical Engineering

In this study, pore pressure response due to pile driving has been observed in the field. Cavity Expansion theory using critical state parameters of the soil has been used to predict the trend of the pore pressure development and dissipation. Parametric study has been carried out to know the sensitivity of various parameters on the predicted results. A comparison has been made between the predicted and observed results.


Variation In Capacities Of Different Pile Types Under Similar Soil Conditions, H. Senapathy, J. R. Davie, M. R. Lewis Jun 1993

Variation In Capacities Of Different Pile Types Under Similar Soil Conditions, H. Senapathy, J. R. Davie, M. R. Lewis

International Conference on Case Histories in Geotechnical Engineering

The interaction between soil and various pile types is of interest because it depends not only on the shear strength characteristics of the soil, but also on the pile dimensions, shape, and installation method, and on time after pile installation. This paper presents load test results from three types of displacement piles installed at the same site. The results obtained from the tests are compared with theoretical estimates. The computed values of soil-pile adhesion, back-calculated from the load tests, are discussed and compared with values found in the literature. Estimated pile capacities during driving and retap are also compared and …


General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda Jun 1993

General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.


Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan Jun 1993

Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan

International Conference on Case Histories in Geotechnical Engineering

The paper spotlights the dynamics of rockfalls and debrisflows in Sri Lanka in the backdrop of some recent examples and discusses the appropriateness of simple energy dissipation systems in situations where source of rockfall is either intractable or difficult to arrest. The question of runout of rockfalls usually significant in the assessment of their damage potential is also discussed and importance of such estimate is highlighted in the context of landslide hazard zonation mapping.