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Hydraulic functions of soils from physical experiments and their applications

Creator:: Su, Charles
Abstract:: Based upon the Pearson Type VIII distribution function, a general retention function which relates the saturation to the capillary pressure in disturbed soils has been discovered. This simple and yet complete function has been shown to describe precisely the imbibition as well as the drainage branch of the retention curve....
Resource Type:: Dissertation
Full Text:: used to determine some hydraulic properties of the soil. With the assumption that the Burdine

Saturated water permeability of soils as related to air permeability at different moisture tension

Creator:: Al-Jibury, Falih Khidir
Resource Type:: Dissertation
Full Text:: , drainability, and aeration capacity as well as the water and air permeability. Soil scientists and drainage

Pore size distributions as measured by the mercury intrusion method and their use in predicting permeability

Creator:: Klock, Glen O.
Abstract:: A number of investigators have proposed equations to predict the permeability of porous media. Most of their equations are based on the distributions of the sizes of the various contributing pores in the medium. Presently the pore size distributions of agricultural soils are most commonly obtained from soil water release...
Resource Type:: Dissertation
Full Text:: intrusion method and their use in predicting permeability AN ABSTRACT OF THE THESIS OF GLEN ORVAL KLOCK

The prediction of unsaturated flow rates from physical properties of the porous medium: project completion report

Creator:: Boersma, L.
Resource Type:: Technical Report
Full Text:: in Predicting Permeability. Soil Sd. Soc. Amer. Proc. 33(1):12-15, 1969. Ahang Kowsar, L. Boersma

Axisymmetric infiltration

Creator:: Brooks, Royal H., United States. Office of Water Resources Research, Leclercq, Paul J., Tebbs, Richard R., and Rawls, Walter
Abstract:: The work reported herein was performed under the annual allotment from the Office of Water Resources Research to the Oregon Water Resources Research Institute. Funds were available over a three year period, but due to difficulty in acquiring graduate students, the total time spent on the project was only 21...
Resource Type:: Technical Report
Full Text:: concerning the relationship s among permeability, capillary pressure, and soil-water content . In all

Nitrate and pesticide transport under pear production in clay and sandy soil

Creator:: Cao, Weidong
Abstract:: Groundwater contamination on irrigated land is of concern in this nation and around the world. In order to reduce the potential of groundwater contamination by agricultural practices such as irrigation, fertilizer and pesticide application, vadose-zone monitoring and sampling are needed. The main objective of this study was to evaluate impacts...
Resource Type:: Masters Thesis
Full Text:: clay and sandy soil AN ABSTRACT OF THE THESIS OF Weidonq Cao for the degree of Master of Science in

A soil property model for evaluating pesticide movement potential

Creator:: Vogue, Margaret A.
Abstract:: Prevention of groundwater contamination by agricultural chemicals requires an understanding of the complex processes that control pesticide movement below the soil surface. Through this understanding it is possible to try to predict which areas may be most vulnerable to contamination. The many models that have been developed to characterize pesticide...
Resource Type:: Masters Thesis
Full Text:: organized into two processes: leaching and sorption. The leaching potential is based on soil permeability

Determination of soil sensitivity ratings for the Oregon Water Quality Decision Aid (OWQDA)

Creator:: Huddleston, J. H. (James Herbert), 1942-, Mendez, W. R., Brett, M., Kerle, Elizabeth A., Vogue, Peggy A., and Oregon State University. Extension Service
Abstract:: Declared out of print March 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Resource Type:: Technical Report
Full Text:: determined by soil permeability, soil depth, depth to groundwater, and hydraulic loading. Soils with a high

A GIS approach to estimating continuous hydraulic conductivity and equivalent hydraulic conductivity

Creator:: Arras, Tracy Lynn
Abstract:: Estimating the hydraulic conductivity of earth materials is important for many water resource modeling efforts, including predicting the transport of pollutants in ground water, computing surface runoff for flood control, and computing water budgets. This research implicitly used topography, soil, and climate data to estimate plausible continuous hydraulic conductivity values...
Resource Type:: Dissertation
Full Text:: , soil, and climate data to estimate plausible continuous hydraulic conductivity values at a basin-wide

An overview of the Oregon Water Quality Decision Aid (OWQDA) : a tool for assessing groundwater contamination risk from specific soil-pesticide combinations

Creator:: Huddleston, J. H. (James Herbert), 1942- and Oregon State University. Extension Service
Abstract:: The Oregon Water Quality Decision Aid (OWQDA) is a first-tier screening tool that allows you to make a broad determination of the likelihood that a specific chemical, when applied to a specific Oregon soil, will move through the soil and contaminate groundwater. This determination is called the groundwater vulnerability rating.
Resource Type:: Technical Report
Full Text:: assessing groundwater contamination risk from specific soil-pesticide combinations J.H. Huddleston The

ScholarsArchive@OSU

Hydraulic functions of soils from physical experiments and their applications

Saturated water permeability of soils as related to air permeability at different moisture tension

Pore size distributions as measured by the mercury intrusion method and their use in predicting permeability

The prediction of unsaturated flow rates from physical properties of the porous medium: project completion report

Axisymmetric infiltration

Nitrate and pesticide transport under pear production in clay and sandy soil

A soil property model for evaluating pesticide movement potential

Determination of soil sensitivity ratings for the Oregon Water Quality Decision Aid (OWQDA)

A GIS approach to estimating continuous hydraulic conductivity and equivalent hydraulic conductivity

An overview of the Oregon Water Quality Decision Aid (OWQDA) : a tool for assessing groundwater contamination risk from specific soil-pesticide combinations

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