162,760 research outputs found
Bridger, Wyoming, Cobble rock wall erected by Mormons
No full textBlack and white photograph by Fred Pack showing a historic cobble wall erected by Mormon pioneers at Fort Bridger, Wyoming
Cobble Sea Defence: Hydraulic Interface Stability of Sand underlying a Single Filter Layer
No full textA cobble sea defence appears to be an easy constructible protection, with relatively low total costs of ownership. Flume tests show that sand under such single layered constructions is stable. However, it is not exactly known how the hydraulic loading of a breaking wave is reducing in the filter. Two datasets containing pressure measurements in a revetment were available for identification of this reduction: 1) A dataset of a test performed in the Großer Wellenkanal (Hannover), for improvement of the understanding of all relevant processes in Elastocoast revetments (obtained from the Braunschweig University of Technology). 2) A dataset of tests in the Delta Flume, for the verification and optimization of the cobble shore design of the ‘Maasvlakte 2’ (obtained from PUMA). The dataset of the Großer Wellenkanal test was analysed to increase the insight in the behaviour of pressures in a filter resulting from (breaking) waves and to explain processes and test results of the Delta Flume model tests. Hydraulic loading at the top of a revetment exist out of two types of loads; impact and non-impact loads. The impact load, resulting from plunging waves, can be distinguished in an impact peak and a quasi-static part. The impact peak is very high (>10 kPa), last for only a fraction of time (<0.2s) and reduces completely in the filter. The non-impact load and the quasi-static part of the impact load reduce less and are responsible for the hydraulic loading at the interface of sand underlying a thick, single filter layer. Although large influence was expected for turbulence generated by breaking waves it does not have an important role in the hydraulic loading that eventually reaches the interface. The parallel gradients at the interface are only the result of pressures in- and decreasing with the wave period. The maximal destabilizing perpendicular gradients are frequently accompanied by a maximal parallel gradient. The main loading mechanism at the interface results from the run-down; during run-down the largest parallel and perpendicular gradients are generated. Predicted gradients acting on the interface between gravel and sand in the Delta Flume models are higher than traditional stability criteria. Therefore, an erosion process of the sandy embankment would be expected for the tested Delta Flume models. However, erosion was not observed. The stable interface in the Delta Flume tests can thus not be explained from the pressure reduction resulting from the analysis of the measurements in the Delta Flume models itself. The damping observed in the Großer Wellenkanal and the non-distorted interface in the Delta Flume models give strong indications that the reduction observed in the gravel material of the Delta Flume models is not representative for the performance of the gravel layer, resulting in a conservative prediction of gradients at the interface of gravel and sand. Several factors could have been influencing the pressures in the revetments of the Delta Flume models and the reduction found in the analysis of the measurements.Hydraulic EngineeringCivil Engineering and Geoscience
Christmas at Cobble Rock
No full textPeople gather around the Conoco Cobble Rock Station to celebrate the coming Christmas holiday
Cobble Rock Station
No full textVernal Jaycees provided Christmas decorations and a Christmas tree at the Cobble Rock Station
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Group at Cobble Rock Station
No full textPeople gather at Cobble Rock Station to watch a parade featuring many of the local school bands
Crowd at Cobble Rock Station
No full textA large group gathers for the Christmas turkey drawing at Cobble Rock Station. Note old Court House in Back ground, also Vogue Theater
Cobble Rock Service Station
No full textFront view of Cobble Rock Station (Snyders Service), taken from the intersection of Main Street and Vernal Avenue. Also visible: Newton Brothers Company and Vernal Auto Company. (See also: Cobblerock.) In the photo are also Herbert Snyder and Leaf Richardson
Men at Cobble Rock Station
No full textGlade and Harmon Sowards, left, are pictured with unidentified men in front of the Cobble Rock Station. Zions Bank is in the background
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