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Articles 1 - 8 of 8
Full-Text Articles in Social and Behavioral Sciences
The Rate Law In Fluvial Geomorphology, William Graf
The Rate Law In Fluvial Geomorphology, William Graf
William L. Graf
No abstract provided.
Fluvial Adjustments To Spread Of Tamarisk In Colorado Plateau Region, William Graf
Fluvial Adjustments To Spread Of Tamarisk In Colorado Plateau Region, William Graf
William L. Graf
Tamarisk, a shrub or low tree that was artificially introduced into the American Southwest in the late 1800s, has spread throughout the Colorado Plateau region by occupying islands, sand bars, and beaches along streams. Historical photographs show that tamarisk spread from northern Arizona to the upper reaches of the Colorado and Green Rivers at a rate of about 20 km/yr. Detailed studies on the Green River in Canyonlands National Park, Utah, show that the plant has trapped and stabilized sediment, causing an average reduction in channel width of 27%. Photogrammetric analysis of historical ground photography, including photos from John Wesley …
Fluvial Adjustments To Spread Of Tamarisk In Colorado Plateau Region - Reply, William Graf
Fluvial Adjustments To Spread Of Tamarisk In Colorado Plateau Region - Reply, William Graf
William L. Graf
No abstract provided.
Quaternary And Geomorphology, J. Andrews, William Graf
Quaternary And Geomorphology, J. Andrews, William Graf
William L. Graf
No abstract provided.
Geomorphology Of Heavy Metals In The Sediments Of Queen Creek, Arizona, Usa, William Graf, S. Clark, M. Kammerer, T. Lehman, K. Randall, R. Schroeder
Geomorphology Of Heavy Metals In The Sediments Of Queen Creek, Arizona, Usa, William Graf, S. Clark, M. Kammerer, T. Lehman, K. Randall, R. Schroeder
William L. Graf
Data from Queen Creek, a dryland stream in southcentral Arizona, show that the distributions of heavy metals (especially Cu, Pb, Zn, and V) in sediments are strongly related to the spatial aspects of fluvial processes. Cu/Zn and Cu/V ratios permit discrimination between materials polluted by eroded mine tailings and those containing only erosion products from the surrounding metalliferous terrain. In stratigraphic sections, metal ratios discriminate between pre-industrial alluvium and post-industrial flood deposits. On valley floors, channels and active alluvium have the highest metal concentrations, while other process environments have decreasing amounts associated with decreasing frequencies of inundation. Materials from the …
Transport And Deposition Of Plutonium-Contaminated Sediments By Fluvial Processes, Los Alamos Canyon, New Mexico, William Graf
Transport And Deposition Of Plutonium-Contaminated Sediments By Fluvial Processes, Los Alamos Canyon, New Mexico, William Graf
William L. Graf
Between 1945 and 1952 the development of nuclear weapons at Los Alamos National Laboratory, New Mexico, resulted in the disposal of plutonium into the alluvium of nearby Acid and (to a lesser degree) DP Canyons. Previous research has identified some of this material in the Rio Grande and defined its distribution in the regional river system. The purpose of this paper is to explore the connection between the disposal sites and the main river, a 20 km link formed by the fluvial system of Acid, Pueblo, DP, and Los Alamos Canyons. Empirical data from 15 yr of annual sediment sampling …
Late Holocene Sediment Storage In Canyons Of The Colorado Plateau, William Graf
Late Holocene Sediment Storage In Canyons Of The Colorado Plateau, William Graf
William L. Graf
Field surveys of ten drainage basins 10 to 1,790 km2 in area in the Colorado Plateau (Utah and Arizona) and repeat photography of 156 fluvial environments providing comparative evidence spanning up to 114 yr reveal that two stratigraphic units characterize the alluvial materials on valley floors. An older unit deposited generally between 1250 A.D. (±200 yr) and 1880 A.D. (±20 yr) was dissected by arroyo development by the early twentieth century. A younger unit was deposited generally during the period after approximately 1943 (±5 yr). Rates of sedimentation in the 1943–1980 period were almost twice the rates in the 1250–1880 …
Distance Decay And Arroyo Development In The Henry Mountains Region, Utah, William Graf
Distance Decay And Arroyo Development In The Henry Mountains Region, Utah, William Graf
William L. Graf
No abstract provided.