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Articles 91 - 118 of 118
Full-Text Articles in Social and Behavioral Sciences
Ch 4: Financial Resources, William Graf
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.
Regional Geomorphology Of North America, William Graf
Regional Geomorphology Of North America, William Graf
William L. Graf
No abstract provided.
Apotential Lessons For The Cesi Program From The Grand Canyon, William Graf
Apotential Lessons For The Cesi Program From The Grand Canyon, William Graf
William L. Graf
No abstract provided.
Measuring Stream Order, A Reply, William Graf
Dam Nation: A Geographic Census Of American Dams And Their Large-Scale Hydrologic Impacts, William Graf
Dam Nation: A Geographic Census Of American Dams And Their Large-Scale Hydrologic Impacts, William Graf
William L. Graf
Newly available data indicate that darns fragment the fluvial system of the continental United States and that their impact on river discharge is several times greater than impacts deemed likely as a result of global climate change. The 75,000 dams in the continental United States are capable of storing a volume of water almost equaling one year's mean runoff, but there is considerable geographic variation in potential surface water impacts. In some western mountain and plains regions, darns can store more than 3 year's runoff, while in the Northeast and Northwest, storage is as little as 25% of the annual …
Landscapes, Commodities, And Ecosystems: The Relationship Between Policy And Science Of American Rivers, William Graf
Landscapes, Commodities, And Ecosystems: The Relationship Between Policy And Science Of American Rivers, William Graf
William L. Graf
No abstract provided.
Thinking Like A River: Reflections On The Gila, William Graf
Thinking Like A River: Reflections On The Gila, William Graf
William L. Graf
No abstract provided.
Fakery In The Publication Game, William Graf
The Effect Of Dam Closure On Downstream Rapids, William Graf
The Effect Of Dam Closure On Downstream Rapids, William Graf
William L. Graf
The force of flowing water and the resistance of the largest boulder provide a means of evaluation of the stability of rapids in canyon rivers. Field measurements and calculations show that the closure of Flaming Gorge Dam, Utah, has had a significant effect on the stability of rapids in the canyons of the Green River in Dinosaur National Monument 68 km (42 mi) downstream from the dam. The reduction in peak flows by the dam has limited the competence of the river to move boulders deposited in the main channel by tributary processes, landslides, and prehistoric floods. Before the dam …
Applied Geomorphology: Geomorphological Survey For Environmental Development, William Graf
Applied Geomorphology: Geomorphological Survey For Environmental Development, William Graf
William L. Graf
No abstract provided.
Geomorphology And Policy For Restoration Of Impounded American Rivers: What Is "Natural"?, William Graf
Geomorphology And Policy For Restoration Of Impounded American Rivers: What Is "Natural"?, William Graf
William L. Graf
No abstract provided.
Soil Erosion, William Graf
Quaternary Geology And Geomorphology, P. Caulkins, William Graf
Quaternary Geology And Geomorphology, P. Caulkins, William Graf
William L. Graf
No abstract provided.
Applied Geomorphology, William Graf
The State Of The Rio Grande/Rio Bravo, William Graf
The State Of The Rio Grande/Rio Bravo, William Graf
William L. Graf
No abstract provided.
Geomorphologic Measurements From Ground-Based Photographs, William Graf
Geomorphologic Measurements From Ground-Based Photographs, 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 …
Issues Concerning Phreatophyte Clearing, Revegetation, And Water Savings Along The Gila River, Arizona, William Graf, Duncan Patten, Bonnie Turner
Issues Concerning Phreatophyte Clearing, Revegetation, And Water Savings Along The Gila River, Arizona, William Graf, Duncan Patten, Bonnie Turner
William L. Graf
A detailed analysis of the published results of the U. S. Geological Survey Phreatophyte Project conducted in the area of interest for the Corps of Engineers Camelsback Dam study provides the following results. It appears that the figure of 18.53 inches per year for water savings from phreatophyte clearing along the Gila River in southeast Arizona should not be used for predicting potential water salvage because of large sampling errors, measurement errors, and the inherent variability of the natural processes of evapotranspiration. An extensive literature review shows that no dependable values are available for the Gila River project area. It …
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.
A Lei De Razao Em Geomorfologia Fluvial, William Graf
A Lei De Razao Em Geomorfologia Fluvial, William Graf
William L. Graf
No abstract provided.
Arid Zone Settlement Planning: The Israeli Experience, By G. Golany, William Graf
Arid Zone Settlement Planning: The Israeli Experience, By G. Golany, William Graf
William L. Graf
No abstract provided.
Use Of Scientific Methods In River Research Section, William Graf
Use Of Scientific Methods In River Research Section, William Graf
William L. Graf
No abstract provided.
Downstream Hydrologic And Geomorphic Effects Of Large Dams On American Rivers, William Graf
Downstream Hydrologic And Geomorphic Effects Of Large Dams On American Rivers, William Graf
William L. Graf
The hydrology and geomorphology of large rivers in America reflect the pervasive influence of an extensive water control infrastructure including more than 75,000 dams. One hundred thirty-seven of the very large dams, each storing 1.2 km3 (106 acre feet) of water or more, alter the flows of every large river in the country. The hydrologic effects of these very large dams emerge from an analysis of the stream gage records of 72 river reaches organized into 36 pairs. One member of each pair is an unregulated reach above a dam, whereas the other is a regulated reach downstream from the …
Geomorphology And American Dams: The Scientific, Social, And Economic Context, William Graf
Geomorphology And American Dams: The Scientific, Social, And Economic Context, William Graf
William L. Graf
American geomorphologic research related to dams is embedded in a complicated context of science, policy, economics, and culture. Research into the downstream effects of large dams has progressed to the point of theory-building, but generalization and theory-building are from this research because (1) it is highly focused on a few locations, (2) it concerns mostly very large dams rather than a representative sample of sizes, (3) the available record of effects is too short to inform us on long-term changes, (4) the reversibility of changes imposed by dam installation and operation is unknown, and (5) coordinated funding for the needed …
Changing Rivers, William Graf
On The Rivers Of Canyonlands, William Graf
The Impact Of Suburbanization On Fluvial Geomorphology, William Graf
The Impact Of Suburbanization On Fluvial Geomorphology, William Graf
William L. Graf
Analysis of aerial photography for the period 1950–1971 and field data collected from 1970 to 1974 indicate that in the Denver area suburban development has caused significant changes in fluvial systems. By first introducing large quantities of sediment and later by increasing surface runoff, suburban development leads to an expansion of floodplains followed by downcutting of streams. As areas of suburban development increase, greater percentages of stream lengths are dominated by transportation, and lesser percentages are dominated by erosion and deposition.