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Articles 1 - 22 of 22
Full-Text Articles in Social and Behavioral Sciences
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.
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 …
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.
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.
Science, Public-Policy, And Western American Rivers, William Graf
Science, Public-Policy, And Western American Rivers, William Graf
William L. Graf
Effective science and well-informed public policy are the avenues to successful management of environmental resources. A critical review of geomorphology, hydrology, and public policy as employed in the management of the river resources of the western United States shows that the endeavours have been poorly connected to each other. Before about 1930, river management disregarded scientific input, while during the New Deal era federal support for river research stimulated a symbiotic relationship between science and policy. Renewed federal funding for research and the emergence of increasingly sophisticated theory and data for rivers during the 1950-1970 period enhanced the connection between …
Streams, Slopes, And Suburban Development, William Graf
Streams, Slopes, And Suburban Development, William Graf
William L. Graf
The percent of available relief in the form of free-face slope and the percent of valley width as floodplain change systematically throughout drainage networks in response to changes in network position. The energy level and discharge of streams at the bases of slopes may be assessed by means of a cumulative stream-ordering system wherein the stream order is directly related to discharge. Investigations of several small drainage basins on the rim of the Denver Basin, Colorado, by means of field measurements, interpretation of aerial photography, and operation of a computer model provide data that indicate that the distribution of near-channel …
A Cumulative Stream-Ordering System, William Graf
A Cumulative Stream-Ordering System, William Graf
William L. Graf
No abstract provided.
The Geography Of American Field Geomorphology, William Graf
The Geography Of American Field Geomorphology, William Graf
William L. Graf
No abstract provided.
Mining And Channel Response, William Graf
Mining And Channel Response, William Graf
William L. Graf
Gold and silver mining activities in the Central City District, Colorado, caused severe disruption of the landscape. Central City is typical of mountain mining towns with clearly defined periods of discovery and settlement, bonanza, investment, development, and, finally, decline. Arroyos and gullies developed on many valley floors as responses to increases in channel tractive force from 1 dyne before settlement to 8 dynes during the mining period. The spatial distribution of energy and force has been substantially altered by human activities. Threshold values of erosive force were surpassed in response to changes in general basin vegetation cover, valley floor vegetation, …
Geographic Geomorphology In The 80'S, William Graf, Stanley Trimble, Terrence Toy, John Costa
Geographic Geomorphology In The 80'S, William Graf, Stanley Trimble, Terrence Toy, John Costa
William L. Graf
The geomorphic sciences will continue to be dynamic in the coming decade. Among other developments, there is a trend toward increased dependence on field reserch, more realistic expectations from reserch tools, a resurgence of interest in man-land relations with a renewed dependence on the historical approach, a reinvestigation of morphogenetic regions, study of planetary surfaces other than earth's, and involvement with applied problems, as well as cooperation and collaboration with scientists in related fields. The greatest need is the development of connections between academic and nonacademic geographers at all levels.
15th Annual Geomorphology Symposium, William Graf
15th Annual Geomorphology Symposium, William Graf
William L. Graf
No abstract provided.
Fluvial Dynamics Of Th-230 In The Church Rock Event, Puerco River, New-Mexico, William Graf
Fluvial Dynamics Of Th-230 In The Church Rock Event, Puerco River, New-Mexico, William Graf
William L. Graf
The largest accidental surface release of radioactive materials in the United States occurred 16 July 1979, when a uranium tailings pond collapsed near Church Rock, New Mexico, releasing 378,500 m3 of liquids and 1000 mg of solids into the Puerco River. The resulting flood wave distributed radioactive thorium-230 through an 80-km reach of the river. A detailed analysis of 48 km of the entrenched channel shows that radionuclide concentrations in stream-bed sediments fluctuated irregularly with increasing distance from the source of contamination instead of declining exponentially as might be expected from hydraulic and geographic theory. Hydraulic calculations at 154 cross-sections …
In The Critical Zone: Geography At The U.S. Geological Survey, William Graf
In The Critical Zone: Geography At The U.S. Geological Survey, William Graf
William L. Graf
Geography is again becoming an integral part of the premier natural-science agency of the federal government. Geographic research emphasizes the surface of the earth, a portion of the earth system that the U.S. Geological Survey (USGS) defines as the “critical zone.” Although geography was part of the USGS from the creation of the agency, in recent years geography in the agency has largely been limited to topographic mapping. Recently, the USGS and an advisory committee of the National Research Council (NRC) reviewed the role of geography at the Survey. The committee's report, along with ongoing decision-making in the federal government, …
Lake Powell: Virgin Flow To Dynamo, By L.D. Potter And C.L. Drake, William Graf
Lake Powell: Virgin Flow To Dynamo, By L.D. Potter And C.L. Drake, William Graf
William L. Graf
No abstract provided.
Mercury Transport In Stream Sediments Of The Colorado Plateau, William Graf
Mercury Transport In Stream Sediments Of The Colorado Plateau, William Graf
William L. Graf
Field, documentary, and laboratory analyses show that geomorphic processes are a central component in explaining the origins and transportation of the 2,200 kg of mercury annually deposited in Lake Powell in Arizona and Utah. Almost all the mercury in the lake is derived from weathering of natural source rocks in the lake's 279,000 km2 drainage area and delivered in fluvial sediments. Of the mean annual mercury input to the lake, 40 percent comes from a single tributary, the Green River. The Colorado River contributes 40 percent of the water to the lake, but only 6 percent of the mercury. Local …
Resources, The Environment, And The American Experience, William Graf
Resources, The Environment, And The American Experience, William Graf
William L. Graf
This paper represents an attempt to trace the development of the change in American attitudes toward resources and the environment and to analyze past, present, and future trends in resource development and environmental protection.
Protocols For Characterizing Aeolian Mass-Flux Profiles, Jean Ellis, Bailiang Li, Eugene Farrell, Douglas Sherman
Protocols For Characterizing Aeolian Mass-Flux Profiles, Jean Ellis, Bailiang Li, Eugene Farrell, Douglas Sherman
Jean Taylor Ellis
No abstract provided.
Assessing The Impacts Of An Organic Restoration Structure On Boat Wakes, Jean Ellis
Assessing The Impacts Of An Organic Restoration Structure On Boat Wakes, Jean Ellis
Jean Taylor Ellis
No abstract provided.
Measuring The Transport Of Aeolian Sand With A Microphone System, Jean Ellis, Rebecca Morrison, Barry Priest
Measuring The Transport Of Aeolian Sand With A Microphone System, Jean Ellis, Rebecca Morrison, Barry Priest
Jean Taylor Ellis
No abstract provided.
Effects Of Sampling Frequency On Wave Characterization, Jean Ellis, Douglas Sherman
Effects Of Sampling Frequency On Wave Characterization, Jean Ellis, Douglas Sherman
Jean Taylor Ellis
No abstract provided.
A Coastal Environment Field And Laboratory Activity For An Undergraduate Geomorphology Course, Jean Ellis, Paul Rindfleisch
A Coastal Environment Field And Laboratory Activity For An Undergraduate Geomorphology Course, Jean Ellis, Paul Rindfleisch
Jean Taylor Ellis
A field and laboratory exercise for an undergraduate geomorphology class is described that focuses on the beach. The project requires one day of fieldwork and two laboratory sessions. In the field, students measure water surface fluctuations (waves) with a pressure sensor, survey beach profiles, collect sediment samples, and observe the beach state. In the laboratory, students wash and dry sediments, complete a grain size analysis, and determine sediment volumes. Students produce a report that includes analysis of wave data and beach profiles and a discussion of their findings.