scholarly journals OPTIMUM CONDITION FOR STABILTY OF AN ARTIFICIAL BEACH WITH A GRAVEL FILTER LAYER UNDER IRREGULAR WAVE ACTION

2011 ◽  
Vol 1 (32) ◽  
pp. 103
Author(s):  
Gozo Tsujimoto ◽  
Tokuzo Hosoyamada ◽  
Tetsuya Kakinoki
Keyword(s):  
Sand Particle ◽  
Beach Profile ◽  
Fine Sediments ◽  
Irregular Wave ◽  
Profile Changes ◽  
Coarse Sediments ◽  
Sand Particles ◽  
Run Up ◽  
Fail Safe ◽  
Filter Layer

The safety of a fail-safe artificial beach was studied. Beach profile changes and the onshore-offshore distribution of the sand particle size were measured in a water flume. Under the action of erosive waves, sand particles are deposited on the run-up area. Because of the increasing permeability of the filter layer, the beach profile can be in equilibrium. A filter layer promotes the sorting of sand particles, and depositional waves deposit coarse sediments on the onshore side and fine sediments on the offshore side for an erosive-type beach. A filter layer has the potential to change the beach profile without requiring changes in the water level. The permeability of a filter layer has greater effect on the water velocities and water surface in the stage of run- down than in the stage of run-up.

scholarly journals Safety Based on Beach Profile Changes of Artificial Coast with Gravel Filter Layer under Irregular Waves

2008 ◽  
Vol 55 ◽  
pp. 746-750
Author(s):  
Gozo TSUJIMOTO ◽  
Tokuzo HOSOYAMADA ◽  
Tetsuya KAKINOKI ◽  
Kohji Uno
Keyword(s):  
Irregular Waves ◽  
Beach Profile ◽  
Profile Changes ◽  
Filter Layer

BEACH PROFILE CHANGES OF AN ARTIFICIAL COAST WITH A GRAVEL FILTER LAYER

2009 ◽  
Author(s):  
Gozo Tsujimoto ◽  
Tokuzo Hosoyamada ◽  
Takeshi Ohnishi ◽  
Tetsuya Kakioki
Keyword(s):  
Beach Profile ◽  
Profile Changes ◽  
Filter Layer

Numerical Modeling of the Influence of the Beach Profile on Wave Run-Up

2013 ◽  
Vol 139 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Luciano Soldini ◽  
Matteo Antuono ◽  
Maurizio Brocchini
Keyword(s):  
Numerical Modeling ◽  
Beach Profile ◽  
Run Up

Modeling beach profile changes by typhoon impacts at Xiamen coast

2018 ◽  
Vol 95 (3) ◽  
pp. 783-804
Author(s):  
Kai Yin ◽  
Sudong Xu ◽  
Wenrui Huang ◽  
Rui Li ◽  
Hong Xiao
Keyword(s):  
Beach Profile ◽  
Profile Changes

scholarly journals UNDERWATER MOUND FOR THE PROTECTION OF DURBAN'S BEACHES

1970 ◽  
Vol 1 (12) ◽  
pp. 62 ◽  
Author(s):  
J.A. Zwaborn ◽  
G.A.W. Fromme ◽  
J.B. FitzPatrick
Keyword(s):  
Settling Velocity ◽  
Scale Effects ◽  
Similarity Criterion ◽  
Test Results ◽  
Beach Profile ◽  
Reasonable Degree ◽  
Model Predictions ◽  
Profile Changes ◽  
High Degree ◽  
Movable Bed

The construction of an underwater mound of sand for the protection and improvement of Durban's beaches has been recommended on the basis of intensive investigations These investigations included prototype measurements of beach changes as related to recorded sea conditions, basic scaling tests in which these beach changes were reproduced to scale in movable bed models and tests of the proposed underwater mound in models, using different scales in order to eliminate possible scale effects The test results showed that, provided the shear-settling velocity similarity criterion is satisfied, beach changes can be reproduced in a movable bed model to a reasonable degree of accuracy Optimum dimensions for the cross section of the mound were determined on the basis of the criterion for erosive and non-erosive wave conditions which was derived from the prototype beach profile changes and confirmed by model tests The resulting dimensions are a mound of sand about 4 5 km long, about 1 200 m offshore, reaching to 7 3 m below LWOST, with side slopes of 1 in 25 and a crest width of 61 m 3 3 Of the total quantity required (8 000 000 m ) some 2 500 000 m of sand, available from harbour dredging works in Durban Bay, had been dumped by May, 1970 Model predictions on mound stability and beach improvements were confirmed to a high degree of accuracy by the full scale events.

Influence of Pipeline Inclination on Hydraulic Conveying of Sand Particles

2012 ◽  
Author(s):  
Ahmed Mohamed Nossair ◽  
Peter Rodgers ◽  
Afshin Goharzadeh
Keyword(s):  
Particle Transport ◽  
High Speed ◽  
Sand Dune ◽  
Sand Particle ◽  
Hydrocarbon Production ◽  
Production Wells ◽  
Load Transport ◽  
Bed Load Transport ◽  
Sand Particles ◽  
Dune Dynamics

The understanding of sand particle transport by fluids in pipelines is of importance for the drilling of horizontal and inclined hydrocarbon production wells, topside process facilities, infield pipelines, and trunk lines. Previous studies on hydraulic conveying of sand particles in pipelines have made significant contributions to the understanding of multiphase flow patterns, pressure drop and particle transport rate in horizontal pipelines. However, due to the complexity of the flow structure resulting from liquid-sand interactions, the mechanisms responsible for bed-load transport flow for hydraulic conveying of sand particles have not been extensively studied in inclined pipelines. This paper presents an experimental investigation of hydraulic conveying of sand particles resulting from a stationary flat bed in both horizontal and +3.6 degree upward inclined pipelines. The characteristics of sand transportation by saltation from an initial sand bed are experimentally visualized using a transparent Plexiglas pipeline and high-speed digital photography. The dune formation process is assessed as a function of pipeline orientation. Based on the visualized dune morphology, pipeline inclination is found to have a significant influence on hydraulic conveying of sand dune dynamics (i.e., dune velocity), as well as sand dune geometry (i.e., dune pitch and characteristic dune angles).

scholarly journals LABORATORY STUDY ON TWO-DIMENSIONAL BEACH TRANSFORMATION DUE TO IRREGULAR WAVES

1986 ◽  
Vol 1 (20) ◽  
pp. 102 ◽  
Author(s):  
Nubuo Mimura ◽  
Yukinori Otsuka ◽  
Akira Watanabe
Keyword(s):  
Wave Train ◽  
Irregular Waves ◽  
Two Dimensional ◽  
Beach Profile ◽  
Irregular Wave ◽  
Sand Ripple ◽  
Ripple Formation ◽  
Sand Movement ◽  
Incident Waves ◽  
Profile Change

In the present study, effects of irregular waves on two-dimensional beach transformation and related phenomena were investigated through a series of laboratory experiments. Attempts were made to determine a representative wave of irregular wave trains which controlled individual phenomenon related to the two-dimensional beach profile change. It was found that the representative wave is different for each phenomenon. For the macroscopic beach profile change, it is the mean wave which represents whole incident waves. On the other hand, some of microscopic phenomena, such as initiation of sand movement and sand ripple formation, are controlled by larger waves in the wave train selectively, of which representative wave is the significant wave.

scholarly journals EXPERIMENTS ON BEACH PROFILE CHANGE WITH A LARGE WAVE FLUME

1982 ◽  
Vol 1 (18) ◽  
pp. 85 ◽  
Author(s):  
Ryoichi Kajima ◽  
Takao Shimizu ◽  
Kohki Maruyama ◽  
Shozo Saito
Keyword(s):  
Simple Model ◽  
Transport Rate ◽  
Sand Transport ◽  
Two Dimensional ◽  
Beach Profile ◽  
Large Wave ◽  
Wave Flume ◽  
Grain Sizes ◽  
Profile Changes ◽  
Profile Change

Two-dimensional beach profile changes were investigated with a newly constructed prototype-scale wave flume. The flume is 205 m long, 3.4 m wide and 6 m deep. Sand of two grain sizes was used in the experiments. Analysis of the results was made through use of the parameter C, introduced by Sunamura and Horikawa (1974) to classify beaches as either erosional and accretionary. Beach profile changes obtained in the flume were similar to those in the prototype (field). Net sand transport rate distributions were classified into five types, two of which do not seem to have been observed in laboratory (smallscale) experiments. A simple model describing the five types was developed for evaluating two-dimensional beach profile changes.

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