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Assessing Biological Effects of Contaminants In Situ
This paper presents a monitoring strategy for assessing the effects of anthropogenic contaminants on aquatic organisms. This strategy takes advantage of our increased understanding of...

Carbon Columns: Success at Last
The first large scale application of carbon columns for municipal wastewater treatment has been operating for two years. The columns were designed as part of a program to upgrade an out...

Spatial Analysis of Ice Charts
Spatial approaches to ice environment modeling can not only lead to better local hazard predictions but also produce regionalizations that are useful for construction, navigation, and...

Stochastic Finite Element Analysis of Gravity Platform Foundation
Gravity foundation design requires determination of total and differential settlement, vertical stress distribution beneath the raft and maximum shear stresses in the sand layers in the...

Coastal Erosion's Impact on California Offshore Oil Development
Recent oil discoveries in the offshore Santa Maria Basin and the Santa Barbara Channel will require the construction of new oil facilities located along 90 miles of Santa Barbara County...

Finite Element Methods in Structural Safety Studies
The use of finite element methods in structural safety studies is discussed and recent work in the area is briefly reviewed. Formulation for a first-order stochastic finite element method...

Stochastic Beams on Elastic Foundation
The finite difference method is applied to the second-moment analysis of beams on elastic foundation with random characteristics. The method is simpler than the stochastic finite element...

New Pavement from Old Concrete
Recycling portland cement concrete has gained momentum as an alternative to resurfacing aging highway and airfield pavements. Recycling cuts down rawmaterial requirements, reduces the...

Stochastic Modeling of Mean Areal Precipitation for Generating Synthetic Streamflows
Statistical precipitation models used as input to conceptual hydrologic models, offer an alternative mechanism for simulating streamflow. In sparsely gauged catchments, or areas where...

Stochastic Simulation of Streamflows
In order to provide a better method of generating synthetic streamflow data, a stochastic model of simulating long-term streamflows is developed. Basically, this method uses historical...

Analysis of Reservoir Operations on the IBM-PC
The optimization of reservoir operations is a major economic concern. This paper contributes a computer software package, SPORO, written for the IBM-PC, for the stochastic optimization...

Hydrological Database Management
Development of hydrological database management is investigated in this study. Lotus 1-2-3, a commercially available database, which makes use of spreadsheet has been used to solve a broad...

Conceptual Framework for Regression Modeling of Ground-Water Flow
The author examines the uses of ground-water flow models and which classes of use require treatment of stochastic components. He then compares traditional and stochastic procedures for...

Study of Stochastic Planning and Design of Multireservoir Systems
A new approach named Lumped to Discrete Programming (LDP) coupled with constrained stochastic optimization and successive approximation approach amongst reservoirs gives promise to subtantially...

Evaluation of the Effects of Temperature and Oxygen Concentration on Lignin Biodegradation
Color in natural waters has been attributed to humic substances which are believed to originate as by-products of lignin biodegradation. The purpose of our research was to examine the...

Potential for Nitrate Removal from Groundwater Supplies Using Biological Deintrification
Nitrate concentrations in groundwater supplies have been increasing over the years throughout many areas in the U. S. to the point of posing potential health dangers to a multitude of...

Role of Air in Improving First-Stage RBC Performance
A four-stage RBC (rotating biological contactor) treatment plant having two parallel trains is used to treat combined municipal and industrial dairy waste from a city with a population...

A Modified RBC Design: Performance Evaluation
An RBC (rotating biological contactor) system was designed using Pall rings type 40, and tested under high organic surface conditions. Influent soluble BOD averaged at 55 mg/l, equivalent...

Fluidization of Biomas Covered Sand Particles
The expansion behavior of the fluidized bed reactor support medium is important in its design and analysis. Steady state and dynamic behavior of fluidized bed expansion were compared with...

Industrial NPDES Toxicity Goals
Biological monitoring of NPDES (National Pollution Discharge Elimination System) effluents is becoming a reality in several EPA regions. While the advantages are genuine the loopholes...

 

 

 

 

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