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Evaluation of Electronic Temperature/Relative Humidity Sensors
Temperature and relative humidity measurements are routine parameters required for most agricultural meteorological applications. Reliable measurements of relative humidity, especially...

Error Analysis of Bulk Density Measurements for Neutron Moisture Gauge Calibration
Six bulk density sampling methods were evaluated for use in neutron gauge calibration. All six methods provided estimates of bulk density which were generally within 5% of bulk density...

Performance Factors of Neutron Moisture Probes Related to Position of Source on Detector
The performances of two commercially available neutron moisture probes with different source-detector placement were evaluated. The probes were the Troxler with the neutron source placed...

Effect of Moisture and Bulk Density Sampling on Neutron Moisture Gauge Calibration
Three moisture and bulk density sampling methods were evaluated for use in neutron gauge calibration. Each of the methods was comprised of a single core or portions of a core taken during...

Well Response in a Leaky Aquifer and Computational Interpretation of Pumping Tests
An analytic solution is derived describing flow in a horizontal confined leaky aquifer of infinite extent around a fully penetrating well of negligible storage capacity. The differences...

Parameter Estimates for a Groundwater Model
This paper presents a parameter sensitivity study of a two dimensional flow and transport model of a contaminated site. Hydrogeological and site data from previous investigations were...

Nonlinear Flow in Embankments
For a large number of water resources projects, the Dupuit-Forchheimer (D-F) assumption is considered a viable design criterion and, consequently, Darcy law is used to determine the locus...

An Optimal Parameter Estimation Model for Groundwater Resource Management
An optimal parameter estimation model is developed to identify the locations of wells, to determine pumping magnitude, and to calculate transmissivity coefficients in a confined aquifer...

Scour Prediction Model at Bridge Abutments
A model to predict local abutment scour is presented. The model is based on a large number of laboratory experiments over the past half century. The dependent variable, a ratio that includes...

Calibration of Manning's Roughness for a River Reach
The Albuquerque Projects Office of the U.S. Bureau of Reclamation collected water surface elevations for measured discharges for the Rio Grande and many of its tributaries to try to obtain...

General Implicit Representation of Hydraulic Structures in Numerical Flow Models
Effects of hydraulic structures (such as culverts, bridge openings, or gates) can be simulated in numerical surface-water-flow models. Generally the scale and dimension of the numerical...

An Application of Nonhomogeneous Poisson Process in Sediment Infiltration Into Gravel Bed
The compound homogenous Poisson process (CNHPP) model (Shen & Todorovic, 1971 ) is found applicable in sediment infiltration into gravel bed due to the unsteady and nonuniform...

Riprap Incipient Motion and Shields' Parameter
Unobstructed incipient motion data from a variety of sources are compiled to re-examine current thinking regarding riprap stability. Shields' framework is investigated and relationships...

Applicability of Two Simplified Flood Routing Methods: Level-Pool and Muskingum-Cunge
Simplified flood routing models for unsteady flow simulation in reservoirs and rivers have advantages of relatively small computing requirements when compared to dynamic routing models...

Estimation of Reliability Parameters for Rehabilitation of Pipelines
This paper presents fundamental principles of estimating statistical characteristics of the elements of urban underground infrastructure networks, which provides a basis of statistical...

An Evaluation of the Strategic Highway Research Project Packing Handbook
The objective of this paper is to present the use of the November 8, 1991 SHRP C-206 report entitled `Packing Handbook - A Guide to the Optimal Gradation of Concrete Aggregates'. The purpose...

Accuracy Requirements for GIS-Based Seismic Risk Assessments
Accurate assessments of potential earthquake damage and casualty risk are essential to the design of seismic hazard mitigation policies and seismically oriented engineering practice. More...

The Proof is in the Pavement
A technique known as statistical quality assurance (SQA) lets DOTs quantify pavement quality by setting statistical guidelines for the work they will accept. SQA is a distinct departure...

Characterization of Man-Made Vitreous Fibers by Image Analysis
This paper deals with the characterization of man-made vitreous fibers (MMVF), seen as an application of the techniques of image analysis and mathematical morphology. We present the whole...

Estimates of Permeability of Porous Materials Using Image Analysis of Cross Sections
We have developed an image processing method for characterizing the pore structure of porous materials such as rock and concrete, to provide a means for understanding the dependence of...

 

 

 

 

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