Index Catalog // ScholarsArchive@OSU

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Creator:: Brandi-Dohrn, Florian M.
Abstract:: Soil solution samplers have certain inadequacies that limit their range of possible applications. Passive Capillary Samplers (PCAPS), which apply suction to the soil pore-water via a fiber glass wick, have shown promising results in preliminary experiments in regard to collection efficiency of water and of bromide tracers. The objectives of...
Resource Type:: Masters Thesis
Full Text:: monitoring the leaching of agrochemicals AN ABSTRACT OF THE THESIS OF Florian M. Brandi -Dohrn for the

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Creator:: Flugstad, Benjamin A.
Abstract:: Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract...
Resource Type:: Dissertation
Full Text:: ..... 215 Figure 3.77: 2-Wire Probe: WC = 0.33: EC = 1.2 S/m: TDR Pred.: 50Ω Term.: Mason: Parallel Model

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

Creator:: Sayde, Chadi
Abstract:: Achieving and maintaining sustainability in irrigated agriculture production in the era of rapidly increasing stress on our natural resources require, among other essential actions, optimum control and management of the applied water. Thus, a significant upgrade of the currently available soil water monitoring technologies is needed. The primary goal of...
Resource Type:: Dissertation
Full Text:: demonstrate the feasibility of AHFO method application to obtain <0.05 m 3 m -3 error distributed

Infiltration and temperature characterization of a wastewater hyporheic discharge system

Creator:: Stewart, Ryan D.
Abstract:: The Clean Water Act imposes Total Maximum Daily Load (TMDL) limits on pollutant concentrations within wastewater effluent; in Oregon, thermal discharge is one of the pollutants subject to regulation. The City of Woodburn, Oregon, funded a series of pilot scale studies to investigate the utility of natural systems to reduce...
Resource Type:: Masters Thesis
Full Text:: maximum water displacement velocities of 1.5 m/day in the horizontal direction, and 0.1 m/day in the

Peppermint irrigation and nitrogen management for the reduction of nitrate loading to groundwater

Creator:: Smesrud, Jason K.
Abstract:: The agricultural production of peppermint has been shown to contribute significant quantities of nitrate-nitrogen to groundwater recharge. In an effort to provide new tools for increasing nitrogen efficiency within peppermint production, three research questions were proposed: i) How should plant tissue samples be collected to achieve the greatest precision when...
Resource Type:: Masters Thesis
Full Text:: variability, a purely random distribution of stem nitrate concentrations was observed on the 1-150 m scale

Understanding Aquifer Water Retention Dynamics Using Groundwater Head Relaxation Time

Creator:: Jimmie, Jordan A.
Abstract:: Diking and channelizing in the Toppenish Creek basin, associated with irrigated agricultural development, has altered its natural ecosystem function and hydraulic processes. We seek to answer two research questions: if surface waters are diverted for aquifer recharge in the winter, will this water be available for ecosystem function in the...
Resource Type:: Masters Thesis
Full Text:: its tributaries throughout most of the basin (Campbell, 1992). Clay layers in the TSARP area are

Monitoring potential groundwater contamination due to agricultural production in Lane County, Oregon

Creator:: Gatchell, Lance O.
Resource Type:: Masters Thesis
Full Text:: subsurface samplers. Soil cores were collected on five farms in Lane County, Oregon at 1 m depth and soil

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:: orchard. They applied water at about 3.75 mm/hour with a wetting circle of 7-10 m. Micro-sprinklers

Characterization of hydrologic parameters and processes in shrink-swell clay soils

Creator:: Stewart, Ryan D.
Abstract:: Vertisols and other vertic-intergrade soils are found all over the globe, including many agricultural and urban areas. These soils are characterized by their cyclical shrinking and swelling behaviors, where bulk density and porosity distribution both vary as functions of time and/or soil moisture. In turn, alterations in physical soil parameters...
Resource Type:: Dissertation
Full Text:: . ..................................................................................................29 2.3 The effect of pore size distribution (m) on wetting front potential and sorptivity

Non-convective ion movement in unsaturated porous media

Creator:: Kelly, Shaun Francis
Resource Type:: Dissertation
Full Text:: 0.075 m probe in air. 191 34. Actual trace from Tektronix 1502B set at maximum resolution (0.1 ft

ScholarsArchive@OSU

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

Infiltration and temperature characterization of a wastewater hyporheic discharge system

Peppermint irrigation and nitrogen management for the reduction of nitrate loading to groundwater

Understanding Aquifer Water Retention Dynamics Using Groundwater Head Relaxation Time

Monitoring potential groundwater contamination due to agricultural production in Lane County, Oregon

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

Characterization of hydrologic parameters and processes in shrink-swell clay soils

Non-convective ion movement in unsaturated porous media

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