Foundation Study Report, Tanana River Crossing at Delta Bridge No. 524 PDF Download
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Author: Alaska. Department of Highways. Materials Section
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 10
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Book Description
Author: Alaska. Department of Highways. Materials Section
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 10
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Book Description
![Foundation Study Report, Salcha River Bridge No. 527 Project F-062-4(11), Fairbanks District, [Adendum I] PDF](https://books.google.com/books/content/images/frontcover/mDDxrQEACAAJ?fife=w80-h100)
Author: Alaska. Department of Highways. Materials Section
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 8
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Book Description
Author: Julie Koppel Maldonado
Publisher: Springer
ISBN: 3319052667
Category : Science
Languages : en
Pages : 178
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Book Description
With a long history and deep connection to the Earth’s resources, indigenous peoples have an intimate understanding and ability to observe the impacts linked to climate change. Traditional ecological knowledge and tribal experience play a key role in developing future scientific solutions for adaptation to the impacts. The book explores climate-related issues for indigenous communities in the United States, including loss of traditional knowledge, forests and ecosystems, food security and traditional foods, as well as water, Arctic sea ice loss, permafrost thaw and relocation. The book also highlights how tribal communities and programs are responding to the changing environments. Fifty authors from tribal communities, academia, government agencies and NGOs contributed to the book. Previously published in Climatic Change, Volume 120, Issue 3, 2013.
Author:
Publisher:
ISBN:
Category : Forest health
Languages : en
Pages : 90
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Book Description
Author: Jeffrey Conaway
Publisher: Createspace Independent Publishing Platform
ISBN: 9781500495459
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
The potential for streambed scour was evaluated at 41 bridges that cross tidal waterways in Alaska. These bridges are subject to several coastal and riverine processes that have the potential, individually or in combination, to induce streambed scour or to damage the structure or adjacent channel. The proximity of a bridge to the ocean and water-surface elevation and velocity data collected over a tidal cycle were criteria used to identify the flow regime at each bridge, whether tidal, riverine, or mixed, that had the greatest potential to induce streambed scour. Water-surface elevations measured through at least one tide cycle at 32 bridges were correlated to water levels at the nearest tide station. Asymmetry of the tidal portion of the hydrograph during the outgoing tide at 12 bridges indicated that riverine flows were stored upstream of the bridge during the tidal exchange. This scenario results in greater discharges and velocities during the outgoing tide compared to those on the incoming tide. Velocity data were collected during outgoing tides at 10 bridges that experienced complete flow reversals, and measured velocities during the outgoing tide exceeded the critical velocity required to initiate sediment transport at three sites. The primary risk for streambed scour at most of the sites considered in this study is from riverine flows rather than tidal fluctuations. A scour evaluation for riverine flow was completed at 35 bridges. Scour from riverine flow was not the primary risk for six tidally-controlled bridges and therefore not evaluated at those sites. Field data including channel cross sections, a discharge measurement, and a water-surface slope were collected at the 35 bridges. Channel instability was identified at 14 bridges where measurable scour and or fill were noted in repeated surveys of channel cross sections at the bridge. Water-surface profiles for the 1-percent annual exceedance probability discharge were calculated by using the Hydrologic Engineering Center's River Analysis System model, and scour depths were calculated using methods recommended by the Federal Highway Administration. Computed contraction-scour depths were greater than 2.0 feet at five bridges and computed pier-scour depths were 4.0 feet or greater at 15 bridges. The potential for streambed scour by both coastal and riverine processes at the bridges considered in this study were evaluated, ranked, and summed to determine a cumulative risk factor for each bridge. Possible factors that could mitigate the scour risks were investigated at 22 bridges that had high individual or cumulative rankings. Mitigating factors such as piers founded in bedrock, deep pier foundations relative to scour depths, and lack of observed scour during field measurements were documented for 13 sites, but additional study and monitoring is needed to better quantify the streambed scour potential for nine sites. Three bridges prone to being affected by storm surges will require more data collection and possibly complex hydrodynamic modeling to accurately quantify the streambed scour potential. Continuous monitoring of water-surface and streambed elevation at one or more piers is needed for two bridges to better understand the tidal and riverine influences on streambed scour.
Author: Michael Zemp
Publisher: UNEP/Earthprint
ISBN: 9789280728989
Category : Science
Languages : en
Pages : 92
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Book Description
This publication is about the world's surface ice on land outside the two polar ice sheets. It provides a sound and well illustrated review on the basis of available data, the global distribution of glaciers and ice caps and their changes since maximum extents of the so-called Little ice Age. The work also presents the latest state of knowledge on glacier changes and discusses the challenges of the 21st century for the monitoring of glaciers and ice caps.
Author: Philip F. Schempf
Publisher:
ISBN: 9780888396952
Category : Science
Languages : en
Pages : 0
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Book Description
An expansive collection of papers and articles from internationally recognized bald eagle experts. Presented is a complete portrait of the status and ecology of the bald eagle in Alaska.A collection of papers and articles from international bald eagle experts, which present a complete portrait of the status and ecology of the bald eagle in Alaska. Myriad topics include culture, biology, population history and status, conservation and management, the Alaskan habitat from the northern rainforest to the Aleutian Islands, attitudes from diverse groups from the Tlingit to bounty hunters, along with sound scientific data.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Author: Jerry L. Coffman
Publisher:
ISBN:
Category : Earthquakes
Languages : en
Pages : 120
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Book Description
Author: Claus-M. Naske
Publisher:
ISBN:
Category : Architecture
Languages : en
Pages : 368
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Book Description
Traces the development of the structure of the Road Commission and describes how Alaska's road system grew from less than a dozen miles of wagon road shortly after the turn of the century, to a network of 10,000 miles of roads by the time the Commission went out of existence in 1956.
