Thesis (Ph. D.)--Oregon State University, 2009. / Printout. Includes bibliographical references. Also available on the World Wide Web.

WRRI 106 is placeholder for the research findings of Project No. G-928-03 funded by U.S. Dept. of the Interior, Geological Survey. Findings are available in Piehl, Bradley T. (1986) An evaluation of culverts on low volume forest roads in the Oregon Coast Range (Masters Thesis, Oregon State University. Forest Engineering) LD43301987.P52.

A study was conducted to determine if polyacrylamide (PAM) could be utilized as a best management practice to reduce soil erosion on forest road embankments. Experiments involving two different PAM application rates (10 and 20 kg/ha) were conducted using natural rainfall in 2001 and 2002 and indoor rainfall simulation. In 2001, PAM was combined with a broadcast application of grass seed. / The study results suggest that PAM provided no statistically significant erosion control after natural rainfall on a loam soil. In the rainfall simulation experiments PAM applied at both 10 and 20 kg/ha significantly reduced soil erosion (by 75 and 77%) and the turbidity of runoff water (by 99%). PAM application at 10 kg/ha significantly increased grass densities (by 109%) compared with the control plots. However, PAM applied at 20 kg/ha provided no significant increase in grass density compared with the control.

Thesis (M.S.)--Oregon State University, 1996. / Typescript (photocopy). Includes bibliographical references (leaves 146-148). Also available on the World Wide Web.

Thesis (M.S.)--Humboldt State University, 1987. / Typescript (photocopy). Includes bibliographical references (leaves 54-56).

Thesis (M.S.)--Oregon State University, 1977. / Includes bibliographical references (p. 47-49). Also available on the World Wide Web.

Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 227-234). Also available on the World Wide Web.

No description available.

This study assessed how logging-access roads may have contributed to observed historical increases in peak discharges associated with small and large logged basins in the western Cascades of Oregon. The study was conducted on the Lookout Creek (62km��) and the upper Blue River (118km��) basins. Potential road effects on hydrology were examined using a combination of field surveys and spatial modeling with a geographic information system (GIS). Road networks were similar in both basins with respect to hillslope position, orientation, and stream crossings, but roads in Blue River were constructed one or two decades later than roads in Lookout Creek. A total of 20% (62 km) of the road length was sampled to assess routing of surface flow, using 31 2-km transects stratified by decade of construction and hillslope position. Along each transect, ditches and culvert outlets were examined and this information used to predict the probable routing of water to (1) existing stream channels, (2) newly eroded gullies downslope of culvert outlets, or (3) subsurface flow. Nearly 60% of the surveyed road length appeared to route water directly to stream channels or into gullies. Over time, the length of road connected to stream crossings has decreased, while the length of road discharging runoff that reinfiltrates to subsurface flow has increased, as roads have progressed up hillslopes and onto ridges in Lookout Creek and Blue River. The relatively constant proportion of the road network draining to gullies over time suggests that roads have the potential to become integrated into stream networks, even when constructed on unchannelled hillslope positions. An extended stream network, assumed to exist under storm conditions, was simulated for the basins using a digital elevation model. Although gullies and ditches differ from natural channels, extrapolation of field surveys using the GIS suggested that roads might extend the stream network by as much as 40% during storm events. It is hypothesized that such an effect could decrease the time of concentration of stormflow and contribute to higher peak discharges observed after clearcutting and road construction in these basins. Differences in the magnitude of road effects on peak flow generation may occur among road systems according to hillslope position of roads, road age, soil saturation, geologic substrate, and climate. These differences may explain the range of observed results from paired-basin studies examining road effects on hydrologic response. / Graduation date: 1994

Thesis (MS)--University of Montana, 2009. / Contents viewed on December 21, 2009. Title from author supplied metadata. Includes bibliographical references.