Digital Commons Network^™

Limnological And Habitat Influences On Wetland Bird Communities In The Nebraska Sandhills, Timothy A. Cramer

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Precipitation Dynamics In Kalamazoo, Sw Michigan: A Stable Isotope Perspective, Madhav V. Machavaram

Masters Theses

No abstract provided.

Groundwater Velocity In An Unconfined Aquifer With Rectangular Areal Recharge, Vitaly A. Zlotnik, Glenn Ledder

Department of Earth and Atmospheric Sciences: Faculty Publications

Three-dimensionsal solutions for the hydraulic head and velocity components for transient groundwater flow in an unconfined compressible aquifer of finite thickness with a rectangular areal recharge source are analyzed using a linearized mathematical model. The solution generalizes Dagan's (1967) results, which were obtained for an idealized aquifer of infinite thickness, and Hantush's (1967) results, which were derived using the Dupuit assumptions. Hydraulic head and velocity components are estimated by asymptotic methods for large times, which are most appropriate for contaminant transport problems. Numerical analysis of the solution demonstrates spatial features of the velocity components in general and a transient effect …

Geology, Geologic Time And Nebraska, Marvin P. Carlson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Holocene And Modern Geomorphic Response To Forest Fires And Climate Change In Yellowstone National Park, Grant A. Meyer

Earth and Planetary Sciences ETDs

The Yellowstone fires of 1988 provided an opportunity to observe the geomorphic impact of widespread, intense forest fires on a mountain environment. Post-1988 fire-related sedimentation events also served as geomorphological and sedimentological analogs which were used to interpret a Holocene stratigraphic record of fire-related alluvial activity. Research focussed primarily on the steep-walled glacial trough valley of Soda Butte Creek, and parts of the Slough Creek and Lamar River drainages in northeastern Yellowstone.

All of the examined major post-1988 fire-related sedimentation events involved the generation of widespread surface runoff from brief, intense summer convective-storm precipitation on steep slopes in intensely burned …

Three-Dimensional Transport Simulations Of The Dispersal Of Volcanic Aerosol From Mount Pinatubo, T. Duncan A. Fairlie

Mechanical & Aerospace Engineering Theses & Dissertations

A global finite-difference model that simulates the large-scale dynamics of the Earth's stratosphere and mesosphere is combined with a global spectral transport model to investigate aspects of the initial dispersal of the volcanic aerosol plume from the Mount Pinatubo eruption in 1991. Results of the modelling study are found to compare well with observations of the volcanic plume made from satellite instruments. Dynamical quantities, diagnosed from the simulated fields are used to provide insight into the evolution of the volcanic plume. Lagrangian trajectory analysis is used to help assess the performance of the Eulerian transport model and to highlight small-scale …

The Biogeochemistry Of Iodine In Seawater, Lingsu Zhang

OES Theses and Dissertations

Iodate and iodide are the two major species of iodine in seawater. In comparison to iodate, iodide is thermodynamically unstable in oxic seawater. The conversion (or reduction) of iodate to iodide may be mediated via biological activities. Since biological activities vary with the season, the conversion of iodate to iodide may also vary seasonally. The conversion (or oxidation) of iodide to iodate is thermodynamically feasible, but the mechanism is poorly known. Hydrogen peroxide, which is ubiquitous in surface seawater, may oxidize iodide to iodate.

Water samples were collected in the middle and lower Chesapeake Bay in different seasons between 1990 …

Brittle Compressive Failure Of Salt-Water Columnar Ice Under Biaxial Loading, T. R. Smith, E. M. Schulson

Dartmouth Scholarship

The brittle failure of saline columnar ice was investigated under biaxial compression at and −10° and −40°C over the range 0 ≤ R A < 1 where R A is the ratio of the intermediate to major principal compressive stress. The major principal stress and the intermediate (confining) stress were orthogonal to the columnar axes (type-A confinement); both stresses and the c-axes of the grains were co-planar. The results confirm earlier work by Hausier (1981) and Timco and Frederking (1983, 1986) on saline ice and follow similar behavior to fresh-water columnar ice found by Smith and Schulson (1993) and Frederking (1977). Failure stress and failure mode are sensitive to the confinement and two regimes of behavior are found: the failure stress first rapidly increases with R A in the range 0 ≤ R A < R T and then tends to decrease for R A > R t. The transition stress ratio, R t changes from ≈0.2 at −10°C to ≈0.1 at −40°C. The failure mode changes from axial splitting to shear faulting in the loading plane for 0 < R A < R t. Above R t failure changes to a combined mode of splitting across the columns and shear faulting out of the loading plane. The failure-stress envelope is of a truncated Coulomb-type. Damage studies show wing cracks and local fragmentation of grains involving the brine pockets. The results are explained in terms of Coulombic sliding and Hertzian crack mechanics.

Organizing From The Ground Up: Watershed Initiatives: The Recent Truckee River Experience, Robert S. Pelcyger

Water Organizations in a Changing West (Summer Conference, June 14-16)

15 pages.

New Legislative Approaches, Laird Noh

Water Organizations in a Changing West (Summer Conference, June 14-16)

7 pages.

Water And Communities: Emerging Issues For Water Organizations, A. Lee Brown, Jr.

Water Organizations in a Changing West (Summer Conference, June 14-16)

13 pages.

Contains 2 pages of references.

Watershed Based Initiatives For Water Resource Planning And Management In Washington State, Kenneth O. Slattery

Water Organizations in a Changing West (Summer Conference, June 14-16)

16 pages.

Contains references.

Building Community Around Water: The Shift From Icon To Substance In The Local Politics Of Water, Donald Snow

Water Organizations in a Changing West (Summer Conference, June 14-16)

11 pages.

New Legislative Approaches, Larry Morandi

Water Organizations in a Changing West (Summer Conference, June 14-16)

14 pages.

Strategies For Acquiring New Urban Water Supplies, Hamlet J. "Chips" Barry

Water Organizations in a Changing West (Summer Conference, June 14-16)

5 pages.

Responding To Water Quality Problems Through Improved Management Of Agricultural Water, David G. Cone, Dennis Wichelns

Water Organizations in a Changing West (Summer Conference, June 14-16)

10 pages.

Contains references.

Fort Collins And The Cache La Poudre River: An Integrated Greenway Vision, Kari V. Henderson

Water Organizations in a Changing West (Summer Conference, June 14-16)

16 pages.

Contains references.

Strategies For Acquiring New Urban Water Supplies, Guy R. Martin

Water Organizations in a Changing West (Summer Conference, June 14-16)

9 pages.

Contains references.

Programs For Obtaining Future Supplies Of Water For Southern California, Duane L. Georgeson

Water Organizations in a Changing West (Summer Conference, June 14-16)

19 pages (includes map).

Strategies For Acquiring New Urban Water Supplies, Patricia Mulroy

Water Organizations in a Changing West (Summer Conference, June 14-16)

10 pages.

The Need For A Regional Drainage District In Water Quality Regulation, Chelsea H. Congdon, Terry F. Young, Brian Gray

Water Organizations in a Changing West (Summer Conference, June 14-16)

11 pages.

Contains references.

Water Quality Impacts Of The Point Of Diversion, Robert C. Helwick

Water Organizations in a Changing West (Summer Conference, June 14-16)

14 pages.

Contains references.

Providing For Fisheries, Recreation, And Other Instream Benefits, Ron Bishop

Water Organizations in a Changing West (Summer Conference, June 14-16)

10 pages.

From Conflict To Cooperative Water Resource Management: The Chelan Agreement And Water Resources Forum [Outline], Bill Frank, Jr.

Water Organizations in a Changing West (Summer Conference, June 14-16)

8 pages.

Overview Of Public And Private Options For Evolving Water Organizations, Lee Kapaloski

Water Organizations in a Changing West (Summer Conference, June 14-16)

15 pages (includes illustration).

Contains footnotes.

Public And Private Options For Evolving Water Organizations, Tim De Young, Duane Brown

Water Organizations in a Changing West (Summer Conference, June 14-16)

45 pages.

Innovative Approaches To Irrigation Conservation, Larry D. Simpson

Water Organizations in a Changing West (Summer Conference, June 14-16)

3 pages.

Water Organizations In The West, Barton H. Thompson, Jr.

Water Organizations in a Changing West (Summer Conference, June 14-16)

37 pages.

Contains references.

Water Organizations In The West, Patricia Mulroy

Water Organizations in a Changing West (Summer Conference, June 14-16)

10 pages.

Water Organizations In The West, Ron Bishop

Water Organizations in a Changing West (Summer Conference, June 14-16)

9 pages.