RIVER CHANNEL CHANGES THROUGH TIME AND ACROSS SPACE: USING THREE COMMONLY‐AVAILABLE INFORMATION SOURCES TO SUPPORT RIVER UNDERSTANDING AND MANAGEMENT IN A NATIONAL PARK

2021 ◽  
Author(s):  
A. M. Gurnell ◽  
C. T. Hill
Keyword(s):  
National Park ◽  
Information Sources ◽  
River Channel ◽  
Channel Changes ◽  
Available Information

Hohokam Political Ecology and Vulnerability: Comments on Waters and Ravesloot

2003 ◽  
Vol 68 (1) ◽  
pp. 169-181 ◽  
Author(s):  
Bradley E. Ensor ◽  
Marisa O. Ensor ◽  
Gregory W. De Vries
Keyword(s):  
Political Ecology ◽  
Social Groups ◽  
River Channel ◽  
Cultural Changes ◽  
Anthropological Perspective ◽  
Channel Change ◽  
Channel Changes ◽  
Environmental Processes ◽  
River Channel Change

Waters and Ravesloot (2001) test the assumption that natural river channel change caused periods of Hohokam cultural reorganization. However, they conclude that channel changes did not correlate with all periods and areas of significant cultural changes and that landscape alone cannot explain Hohokam transformations. An anthropological perspective on political ecology and disasters can explain why environmental processes and events differentially impact societies, differentially impact societies diachronically and differentially impact social groups within societies. We suggest that this perspective may explain the variability described by Waters and Ravesloot.

Temporal river channel changes in the Gila Box Riparian National Conservation Area, Arizona, USA

2013 ◽  
Vol 34 (1) ◽  
pp. 60-73 ◽  
Author(s):  
David Arthun ◽  
George Ν. Zaimes ◽  
Jonathan Martin
Keyword(s):  
River Channel ◽  
Conservation Area ◽  
Channel Changes

scholarly journals METADATA RANKING AND PRUNING FOR FAILURE DETECTION IN GRIDS

2008 ◽  
Vol 18 (03) ◽  
pp. 371-390 ◽  
Author(s):  
DEMETRIOS ZEINALIPOUR-YAZTI ◽  
HARRIS PAPADAKIS ◽  
CHRYSSIS GEORGIOU ◽  
MARIOS D. DIKAIAKOS
Keyword(s):  
Grid Computing ◽  
Large Scale ◽  
Information Sources ◽  
Job Scheduling ◽  
Failure Detection ◽  
Evaluation Study ◽  
Full Potential ◽  
Processing Power ◽  
Available Information ◽  
Ranking Information

The objective of Grid computing is to make processing power as accessible and easy to use as electricity and water. The last decade has seen an unprecedented growth in Grid infrastructures which nowadays enables large-scale deployment of applications in the scientific computation domain. One of the main challenges in realizing the full potential of Grids is making these systems dependable. In this paper we present FailRank, a novel framework for integrating and ranking information sources that characterize failures in a grid system. After the failing sites have been ranked, these can be eliminated from the job scheduling resource pool yielding in that way a more predictable, dependable and adaptive infrastructure. We also present the tools we developed towards evaluating the FailRank framework. In particular, we present the FailBase Repository which is a 38GB corpus of state information that characterizes the EGEE Grid for one month in 2007. Such a corpus paves the way for the community to systematically uncover new, previously unknown patterns and rules between the multitudes of parameters that can contribute to failures in a Grid environment. Additionally, we present an experimental evaluation study of the FailRank system over 30 days which shows that our framework identifies failures in 93% of the cases and can achieve this by only fetching 65% of the available information sources. We believe that our work constitutes another important step towards realizing adaptive Grid computing systems.

River channel changes of the Subansiri in Assam, India

Geomorphology ◽  
1999 ◽  
Vol 30 (3) ◽  
pp. 227-244 ◽  
Author(s):  
U Goswami ◽  
J.N Sarma ◽  
A.D Patgiri
Keyword(s):  
River Channel ◽  
Channel Changes

scholarly journals Topographical change caused by moderate and small floods in a gravel bed ephemeral river – a depth-averaged morphodynamic simulation approach

2018 ◽  
Vol 6 (1) ◽  
pp. 163-185 ◽  
Author(s):  
Eliisa S. Lotsari ◽  
Mikel Calle ◽  
Gerardo Benito ◽  
Antero Kukko ◽  
Harri Kaartinen ◽  
...  
Keyword(s):  
Laser Scanning ◽  
River Channel ◽  
Erosion And Deposition ◽  
Channel Changes ◽  
Meandering River ◽  
Gravel Bed ◽  
Field Evidence ◽  
Ephemeral Rivers ◽  
Bedload Sediment ◽  
Low Magnitude

Abstract. In ephemeral rivers, channel morphology represents a snapshot at the end of a succession of geomorphic changes caused by floods. In most cases, the channel shape and bedform migration during different phases of a flood hydrograph cannot be identified from field evidence. This paper analyses the timing of riverbed erosion and deposition of a gravel bed ephemeral river channel (Rambla de la Viuda, Spain) during consecutive and moderate- (March 2013) and low-magnitude (May 2013) discharge events, by applying a morphodynamic model (Delft3D) calibrated with pre- and post-event surveys by RTK-GPS points and mobile laser scanning. The study reach is mainly depositional and all bedload sediment supplied from adjacent upstream areas is trapped in the study segment forming gravel lobes. Therefore, estimates of total bedload sediment mass balance can be obtained from pre- and post-field survey for each flood event. The spatially varying grain size data and transport equations were the most important factors for model calibration, in addition to flow discharge. The channel acted as a braided channel during the lower flows of the two discharge events, but when bars were submerged in the high discharges of May 2013, the high fluid forces followed a meandering river planform. The model results showed that erosion and deposition were in total greater during the long-lasting receding phase than during the rising phase of the flood hydrographs. In the case of the moderate-magnitude discharge event, deposition and erosion peaks were predicted to occur at the beginning of the hydrograph, whereas deposition dominated throughout the event. Conversely, the low-magnitude discharge event only experienced the peak of channel changes after the discharge peak. Thus, both type of discharge events highlight the importance of receding phase for this type of gravel bed ephemeral river channel.

River Channel Changes

1979 ◽  
Vol 24 (1-2) ◽  
pp. 193-194
Author(s):  
M. Morisawa
Keyword(s):  
River Channel ◽  
Channel Changes
Sign in / Sign up

Export Citation Format

Share Document