A RELATIONSHIP BETWEEN GRAIN SIZE CHARACTERISTICS AND LIQUEFACTION DEGREE ON AWAJI ISLAND COASTAL SAND BEACH

2019 ◽  
Vol 75 (2) ◽  
pp. I_731-I_736
Author(s):  
Taishi OGINO ◽  
Koji UNO ◽  
Tetsuya KAKINOKI
Keyword(s):  
Grain Size ◽  
Sand Beach ◽  
Coastal Sand

scholarly journals The movement of desert sand

1936 ◽  
Vol 157 (892) ◽  
pp. 594-620 ◽  
Keyword(s):  
Grain Size ◽  
Wind Velocity ◽  
Mass Movement ◽  
Mechanical Analysis ◽  
Sand Beach ◽  
Desert Sand ◽  
Eolian Sand ◽  
Percentage Weight ◽  
Surface Sand ◽  
Quartz Grains

It is well known that on a dry sand beach and, on a much larger scale, on sand-strewn desert country the wind, if above a certain strength, will cause the surface sand grains to rise and to travel down-wind as a low-flying cloud. The mechanism, however, by which ( a ) the grains composing this cloud are raised, ( b ) the rate of mass movement of the sand depends upon the wind velocity, or ( c ) the wind velocity close to the surface is affected by the presence of the sand cloud, does not appear to have been previously investigated experimentally. This mutual interaction of wind and sand grains is of interest both in connexion with the problem of the tendency of sand to heap itself up into dunes even in totally flat uniform plains, and also for the light it may throw on certain aspects of the allied problem of the transport of sediment by liquid currents. Sand found in the desert is usually composed of rounded quartz grains whose sizes range from small pebbles 2 to 3 mm. in diameter down to small particles 0∙01 mm. in diameter, which must be regarded as dust. Mechanical analysis of eolian sand for grain size show, when curves of percentage weight are plotted against grain size, that the peaks of such curves never occur on the small side of 0∙15 mm. diameter. Sand having this smallest peak size is found at the crests of dunes. Here the grains approach uniformity of size, so that the diagrams are sharp-peaked. On the other hand, sand deposits clear of the actual dunes give broad, low diagrams with the peak at a larger diameter. In every case the diagrams show only a few per cent by weight at a size of 0∙03 mm. In fact, it is a peculiarity of all sand accumulations that they are practically free from dust.

scholarly journals THE DEVELOPMENT OF A SAND BEACH BY DEEP-WATER WAVES

2000 ◽  
Vol 1 (4) ◽  
pp. 12
Author(s):  
Harold Flinsch
Keyword(s):  
Grain Size ◽  
Deep Water ◽  
Water Waves ◽  
Equilibrium Theory ◽  
Sand Beach ◽  
Shore Line ◽  
Natural Development ◽  
Accurate Forecast ◽  
Sand And Gravel ◽  
The Waves

In a previous paper**, it was shown that the mechanism of the trochoidal waves can be used to determine the equilibrium slope of a sand beach under any wave conditions. As a start it was assumed that the beach material was of uniform grain size, and that the waves approached the beach directly with all motion in planes at right angles to the shore line. In the present paper, the application of the theory is shown in the development of various sand and gravel beaches. The equilibrium theory is studied in the light of the fact that there is usually considerable transportation of material along the shore. In particular, attention is called to the characteristics of beaches with rounded or pointed contours, of beaches whose ends are closed off by rocks or cliffs, or whose ends are open and extend into deep water without barriers of any kind. A method of study and analysis is demonstrated which can be applied to all beaches. Finally, it is shown that an accurate forecast of the natural development of a beach can be made on the basis of the equilibrium slope equation, as well as a forecast of the effect of any structure placed in a naturally developing beach.

STUDI KARAKTERISTIK SEDIMEN KAITANNYA DENGAN PENGELOLAAN WILAYAH PESISIR INDRAMAYU JAWA BARAT

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Basri M Ganie
Keyword(s):  
Grain Size ◽  
Sediment Deposition ◽  
Local People ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Sediment Characteristic ◽  
Coastal Sand ◽  
Delta Sediments

The northern part of java coastline in particular in Dadap Valley and Limbangannearby to Indramayu was heavily destroyed by erosion affected by strong wavecoming from opensea.It showed that some areas such as in Pamanukan coastline seemed to be heavily threated by erosion. This study was carried out by scientist of BPPT with the Objective of understanding the characteristic of sediments affected by erosion in Indramayu coast areas. According to information from local people living nearby coast and beach of Indramayu, The erosion destroyed coastline approximately 10-20 meter every year. Based on grain size analysis the sediments reveald 3 catagories of environment covered a long coast areas in Indramayu as follow :1. Coast sediments ; consisting of fein coastal sand, Silt.2. Delta sediments ; Siltig sand with Mollusca fragments.3. Flood upland sediments; Humous clay, silt, middle to coarse sands.The Occurrence of fein sand sediment deposition on the upper layer of coastalareas indicated that areas may influenced directly also with strong long shorecurrent.Keywords: sediment characteristic, coast, delta sediments, flood upland sediments, Delta , sediment abrasion

Assessment of temporal changes in coastal sand dune environments using the log-hyperbolic grain-size method

Sedimentology ◽  
2002 ◽  
Vol 49 (6) ◽  
pp. 1229-1252 ◽  
Author(s):  
Jasper Knight ◽  
Julian D. Orford ◽  
Peter Wilson ◽  
Sharon M. Braley
Keyword(s):  
Grain Size ◽  
Sand Dune ◽  
Temporal Changes ◽  
Coastal Sand Dune ◽  
Coastal Sand

scholarly journals Ecosystem services on coastal sand beach: the significance as provisioning, regulating, cultural services

2012 ◽  
Vol 17 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Korehisa Kaneko ◽  
Keiko Oshida ◽  
Hajime Matsushima
Keyword(s):  
Ecosystem Services ◽  
Sand Beach ◽  
Cultural Services ◽  
Coastal Sand

scholarly journals SEBARAN PASIR LAUT SEBAGAI BAHAN GALIAN DI LEPAS PANTAI SELAT RIAU

2019 ◽  
Vol 16 (2) ◽  
Author(s):  
Deny Setiady ◽  
Udaya Kamiludin ◽  
Ildrem Syafri
Keyword(s):  
Grain Size ◽  
Silty Sand ◽  
Coastal Sediments ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Sand Beach ◽  
Sediment Grain Size ◽  
Offshore Area ◽  
Sandy Gravel ◽  
Sandy Silt

Daerah penelitian terletak di perairan antara Pulau Batam dan Pulau Bintan (Selat Riau), termasuk ke dalam wilayah Kotamadya Batam dan Kabupaten Bintan, Provinsi Kepulauan Riau. Metode penelitian yang dilakukan adalah pengambilan posisi (navigasi), pengukuran kedalaman dasar laut, pengamatan dan pengambilan contoh sedimen pantai, pengambilan contoh sedimen dasar laut, serta analisis laboratorium. Tujuan penelitian adalah untuk mengetahui sebaran pasir pasir laut, serta ketebalannya berdasarkan karakteristik ukuran butirannya, agar potensi bahan galian tersebut dapat diketahui. Berdasarkan analisis ukuran butir sedimen di pantai Pulau Batam dan Pulau Bintan diketahui berukuran pasir, kerikil pasiran, pasir kerikilan dan lanau pasiran, sedangkan sebaran sedimen dasar laut terdiri dari: kerikil pasiran, pasir kerikilan, pasir, pasir lanauan dan lanau pasiran. Kedalaman sedimen pasir di pantai Pulau Batam antara 1 meter sampai 2,6 meter, sedangkan ketebalan sedimen pasir di Pulau Bintan antara 0,6 meter sampai 2 meter. Kata Kunci: sedimen, ukuran butir, pasir, bahan galian, Selat RiauThe study area is located in offshore area between Batam and Bintan Islands (Riau Strait), including of Batam and Bintan regency, Kepulauan Riau Province. The research methods carried out were position taking (navigation), depth of seabed measurement (bathymetry), observation and coastal sediments sampling, seabed sediments sampling, and laboratory analysis. The objectives of the study is to know the sand beach and sea sand distribution and its thickness based on characteristics of grain size, as well as to know those construction materials. Based on sediment grain size analysis on the Batam and Bintan islands, sand beach consists of: sand, sandy gravel, gravelly sand and sandy silt, while seafloor surficial sediments distribution consist of sandy gravel, gravelly sand, sand, silty sand and sandy silt. The depth of sand sediment on Batam beach is between 1 to 2.6 meters, while the depth of sand sediment in Bintan Island coastal is between 0.6 meters to 2 meters. Keywords: sediment, grain size, sands, substrate material, Riau Strait

Effect of Shock Loading on the Microstructure of Uniloy 326

1974 ◽  
Vol 32 ◽  
pp. 504-505
Author(s):  
K. P. Staudhammer ◽  
L. E. Murr
Keyword(s):  
Grain Size ◽  
Shock Loading ◽  
Current Investigation ◽  
Two Phase ◽  
05 C ◽  
Shock Deformation ◽  
Heat Treated

The effect of shock loading on a variety of steels has been reviewed recently by Leslie. It is generally observed that significant changes in microstructure and microhardness are produced by explosive shock deformation. While the effect of shock loading on austenitic, ferritic, martensitic, and pearlitic structures has been investigated, there have been no systematic studies of the shock-loading of microduplex structures.In the current investigation, the shock-loading response of millrolled and heat-treated Uniloy 326 (thickness 60 mil) having a residual grain size of 1 to 2μ before shock loading was studied. Uniloy 326 is a two phase (microduplex) alloy consisting of 30% austenite (γ) in a ferrite (α) matrix; with the composition.3% Ti, 1% Mn, .6% Si,.05% C, 6% Ni, 26% Cr, balance Fe.

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