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Articles 1 - 30 of 541
Full-Text Articles in Social and Behavioral Sciences
Holocene Lacustrine Deposits And Sediment Yield In Lake Canyon, Southeastern Utah, William Graf
Holocene Lacustrine Deposits And Sediment Yield In Lake Canyon, Southeastern Utah, William Graf
William L. Graf
No abstract provided.
Platte River: Water For People And Wildlife, William Graf
Platte River: Water For People And Wildlife, William Graf
William L. Graf
No abstract provided.
In Memoriam, Melvin G. Marcus, 1929-1997, William Graf, Patricia Gober, Anthony Brazel
In Memoriam, Melvin G. Marcus, 1929-1997, William Graf, Patricia Gober, Anthony Brazel
William L. Graf
No abstract provided.
Saving Water In A Desert City, By W.E. Martin, H.M. Ingram, N.K. Laney, And A.H. Griffin, William Graf
Saving Water In A Desert City, By W.E. Martin, H.M. Ingram, N.K. Laney, And A.H. Griffin, William Graf
William L. Graf
No abstract provided.
Network Characteristics In Suburbanizing Streams, William Graf
Network Characteristics In Suburbanizing Streams, William Graf
William L. Graf
Analysis of hydrologic, geomorphic, and suburbanization data from a small instrumented drainage basin near Iowa City, Iowa, indicates that channel networks are radically altered when suburban development overtakes a drainage basin. Changes in channel networks are such that the network becomes much more efficient in collecting water quickly, so that lag time and kurtosis of storm hydrographs are altered to produce the familiar flash floods of urban areas. The data show that network changes are closely associated with lag time and kurtosis of storm hydrographs and suggest that corrective measures should be concentrated on the internal links of the network. …
Sources Of Uncertainty In River Restoration Research, William Graf, M. Diamond, B. Kronvang
Sources Of Uncertainty In River Restoration Research, William Graf, M. Diamond, B. Kronvang
William L. Graf
No abstract provided.
Catastrophe Theory In Fluvial Geomorphology, William Graf
Catastrophe Theory In Fluvial Geomorphology, William Graf
William L. Graf
No abstract provided.
Downstream Changes In Stream Power In The Henry Mountains, Utah, William Graf
Downstream Changes In Stream Power In The Henry Mountains, Utah, William Graf
William L. Graf
Total stream power does not necessarily increase systematically in the downstream direction because of the conflicting influences of channel slope, width, and depth. Historical records and field data for arroyo systems of the northern Henry Mountains, south-central Utah, show that total stream power decreased in the downstream direction during a deposition period before 1896 and increased downstream during an erosion period thereafter. When total stream power declined in the downstream direction, channels were small and meandering, and the ten-year flood exceeded channel capacity, resulting in overbank deposition of sediment. After an especially erosive flood in 1896, total stream power increased …
Locational Probability For A Dammed, Urban Stream: Salt River, Arizona, William Graf
Locational Probability For A Dammed, Urban Stream: Salt River, Arizona, William Graf
William L. Graf
Data from historical aerial photographs analyzed with a GIS show that river channel change on the Salt River in the Phoenix metropolitan area of central Arizona has been driven by large-scale regional flood events and local human activities. Mapping of functional surfaces such as low-flow channels, high-flow channels, islands, bars attached to channel banks, and engineered surfaces shows that during the period from 1935 to 1997, the relative areal coverage of these surfaces has changed. Flood events have caused general changes in sinuosity of the low-flow channel, but islands have remained remarkably consistent in location and size, while channel-side bars …
The Rate Law In Fluvial Geomorphology, William Graf
The Rate Law In Fluvial Geomorphology, William Graf
William L. Graf
No abstract provided.
Variability Of Sediment Removal In A Semi-Arid Watershed, William L. Graf
Variability Of Sediment Removal In A Semi-Arid Watershed, William L. Graf
William L. Graf
Field and documentary data from Walnut Gulch Watershed, an instrumented semiarid drainage basin of approximately 150 km2 (57 mi2) in southeastern Arizona, show that 83% of the alluvium removed from the basin during a 15‐year erosion episode beginning about 1930 was excavated from the highest‐order stream. The amount of alluvium removed in the erosion episode would have been equal to a covering of about 4 cm (1.6 in) over the entire basin. The rate of sediment removal during the erosion episode was 18 times greater than the rate of present channel sediment transport. Production of sediment from slopes and channel …
Inside The Beltway: Geography At The National Research Council, William Graf
Inside The Beltway: Geography At The National Research Council, William Graf
William L. Graf
Professor Graf provides ample reason why all geographers need to be cognizant of the work by the National Research Councils (NRC) two bodies focussed on mapping issues.“The importance of the two geography committees at NRC is that they give American geographers a voice in issues of national and international importance, and they put geographers on a similar footing with physicists, chemists, medical specialists, biologists, and other scientists.” Read about what has been done and how to get involved…only at Directions Magazine.
Geomorphological Techniques, William Graf
Morphotectonics, William Graf
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 …
Spatial Variation Of Fluvial Processes In Semi-Arid Lands, William Graf
Spatial Variation Of Fluvial Processes In Semi-Arid Lands, William Graf
William L. Graf
No abstract provided.
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.
Testimony In Support Of The Congaree National Park Act Of 2003, William Graf
Testimony In Support Of The Congaree National Park Act Of 2003, William Graf
William L. Graf
No abstract provided.
Death In The Marsh, William Graf
Catastrophe Theory As A Model For Change In Fluvial Systems, William Graf
Catastrophe Theory As A Model For Change In Fluvial Systems, William Graf
William L. Graf
No abstract provided.
Criteria For Watershed Sustainability: Proceedings Of A Workshop--Report To The President's Council On Sustainable Development, William Graf
Criteria For Watershed Sustainability: Proceedings Of A Workshop--Report To The President's Council On Sustainable Development, William Graf
William L. Graf
No abstract provided.
The Geography Of Geomorphologists In The United States, J. Costa, William Graf
The Geography Of Geomorphologists In The United States, J. Costa, William Graf
William L. Graf
No abstract provided.
Relationship Between Morphology Of Small Streams And Sediment Yield, H. Chang, William Graf, E. Grissinger, H. Guy, W. Osterkamp, G. Parker, S. Trimble, L. Lane
Relationship Between Morphology Of Small Streams And Sediment Yield, H. Chang, William Graf, E. Grissinger, H. Guy, W. Osterkamp, G. Parker, S. Trimble, L. Lane
William L. Graf
The state of the art in the relations between morphology of small streams and sediment yield is assessed. Research findings and recommendations for additional research are presented. Topics include systems and interactions, simulation models, channel forms and processes, transport of sediment in small streams, and aspects of channel morphology. Selected topics for additional research are also included.
Why Physical Geographers Whine So Much, William Graf
Why Physical Geographers Whine So Much, William Graf
William L. Graf
No abstract provided.
Process In Geomorphology, By C. Embleton And J. Thornes, William Graf
Process In Geomorphology, By C. Embleton And J. Thornes, William Graf
William L. Graf
No abstract provided.
Geographers' Too Small World, William Graf
Dry Lands: Man And Plants, By R. Adams, M. Adams, A. Willens, And A. Willens, William Graf
Dry Lands: Man And Plants, By R. Adams, M. Adams, A. Willens, And A. Willens, William Graf
William L. Graf
No abstract provided.
The Changing Role Of Dams In Water Resources Management, William Graf
The Changing Role Of Dams In Water Resources Management, 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.
Fluvial Processes In The Lower Fremont River Basin, William Graf
Fluvial Processes In The Lower Fremont River Basin, William Graf
William L. Graf
No abstract provided.