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Author: John P. Ahrens Publisher: ISBN: Category : Hydraulic models Languages : en Pages : 0
Book Description
Tests of riprap stability under wave attack were conducted at prototype scale in the large wave tank at the U.S. Army Coastal Engineering Research Center (CERC). Wave heights ranging from 1.4 to 6 feet and wave periods ranging from 2.8 to 11.3 seconds, were used. Three embankment slopes, 1 on 1.5, 1 on 3.5, and 1 on 5, were tested. The riprap stone was a diorite placed on the embankments by dumping. The median stone weights of the riprap ranged from 27 to 120 pounds. The study showed that wave period, because of its influence on breaker characteristics, has a significant effect on riprap stability. Wave conditions which produce the lowest riprap stability are predictable and are associated with a collapsing-type breaker.
Author: John P. Ahrens Publisher: ISBN: Category : Ocean waves Languages : en Pages : 17
Book Description
Test data on the stability of dumped quarry stone riprap to wave attack is presented and analyzed. The tests were conducted in the large two-dimensional wave tank at the Coastal Engineering Research Center (CERC) at near prototype scale. The test data show riprap stability changes with wave period with the lowest stability occurring at a period that creates a collapsing breaker. Methods to predict riprap stability and wave runup on riprap are developed and discussed. (Author).
Author: John P. Ahrens Publisher: ISBN: Category : Hydraulic models Languages : en Pages : 0
Book Description
Tests of riprap stability under wave attack were conducted at prototype scale in the large wave tank at the U.S. Army Coastal Engineering Research Center (CERC). Wave heights ranging from 1.4 to 6 feet and wave periods ranging from 2.8 to 11.3 seconds, were used. Three embankment slopes, 1 on 1.5, 1 on 3.5, and 1 on 5, were tested. The riprap stone was a diorite placed on the embankments by dumping. The median stone weights of the riprap ranged from 27 to 120 pounds. The study showed that wave period, because of its influence on breaker characteristics, has a significant effect on riprap stability. Wave conditions which produce the lowest riprap stability are predictable and are associated with a collapsing-type breaker.
Author: Dennis G. Markle Publisher: ISBN: Category : Erosion Languages : en Pages : 68
Book Description
Both two-dimensional and three-dimensional hydraulic model investigations were conducted to test the stability of a new streambank protection concept when exposed to short-period wave attack. The concept, referred to as 'Riprap-Filled Cells, ' consists of containerizing riprap in various sizes of cells. Based on the 1:4-scale (model:portotype) model tests and results for the 'riprap-filled cells' placed on IV-on-2H stream bank slopes that are assumed to be stable and imperable and for angles of wave attack of 90, 60, and 30 deg, it is concluded that: (a) one-ft-cube cells (full and half-full of 0.6-to 4.6-lb riprap) are stable (no streambank exposure) for 2.0-sec, 1.0-to 1.75-ft. 4.0-sec, 1.0-to 3.0-ft, and 6.0-sec, 1.0-to 2.5-ft nonbreaking waves; (b) rectangular cells (half-full of 0.6-to 4.6-lb riprap) are stable for nonbreaking wave heights up to and including 1.5 ft for wave periods of 2.0 and 6.0 sec. Wave heights exceeding this produce spot exposures of the streambank; (c) rectangular cells (full of 0.6-to 4.6-lb riprap) are stable for 6.0-sec, nonbreaking waves up to and including 2.0-ft. Wave heights exceeding 2.0-ft produced spot exposures of the streambank; (d) both runup and rundown on all sections tested appear to be functions of wave steepness, relative depth, and angle of wave attack. The angles of wave attack, listed in descending magnitudes of runup and rundown produced, are 60, 90, and 30 deg.
Author: Arvid L. Thomsen Publisher: ISBN: Category : Embankments Languages : en Pages : 0
Book Description
Tests of models in wave tanks were made to determine the effectiveness of several riprap designs in protecting embankment slopes from wave action. Models ranging from about 1:20 scale to almost full scale were tested with waves up to about 6 feet high. A range of wave periods were tested, embankment slopes varied from 1 on 2 to 1 on 5, and armor layers were composed of quarried stone, glacial boulders and tribars. Relationships that define the effect of wave height, wave period, embankment slopes and Reynolds number on size of stable armor units were experimentally determined and are given in graphs and tables. (Author).
Author: John P. Ahrens
Author: John P. Ahrens
Author: John P. Ahrens
Author: John P. Ahrens
Author: 
Author: Arvid L. Thomsen
Author: Laurie L. Broderick
Author: Coastal Engineering Research Center (U.S.)
Author: Dennis G. Markle
Author: Arvid L. Thomsen
Author: Thorndike Saville