scholarly journals Karakteristik sedimen pada Perairan Sei Carang, Kota Tanjungpinang - Indonesia

2020 ◽  
Vol 1 (2) ◽  
pp. 11
Author(s):  
Ockynawa Asmara Putri Yolanda ◽  
Winny Retna Melani ◽  
Wahyu Muzammil
Keyword(s):  
Coarse Sand ◽  
Medium Sand ◽  
Purposive Sampling

Perairan Sei Carang memiliki banyak area lahan terbuka dan bekas pertambangan bauksit di masa lampau. Selain itu, saat terjadi hujan di perairan Sei Carang ditemukan perairan keruh dan air berubah warna menjadi coklat kekuning-kuningan. Oleh karena itu, dilakukan penelitian dengan tujuan mengetahui kondisi lingkungan fisika perairan di perairan Sei Carang dengan parameter uji berupa kekeruhan dan kecepatan arus serta mengetahui karakteristik sedimen di perairan Sei Carang dengan menggunakan metode purposive sampling. Metode purposive sampling tersebut diterapkan pada 4 stasiun penelitian dengan karakteristik stasiun I pada area lahan bekas pertambangan bauksit, stasiun II pada area lahan terbuka, stasiun III pada vegetasi mangrove rusak akibat penebangan, dan stasiun IV pada vegetasi mangrove alami. Karakteristik sedimen pada kolom perairan Sei Carang berupa medium sand, sedangkan pada dasar perairan Sei Carang berupa coarse sand.

scholarly journals Studi Ukuran Diameter Butir Sedimen Dasar terhadap Kecepatan Arus di Sungai Pawan Kabupaten Ketapang

PRISMA FISIKA ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 17
Author(s):  
Tuti Nursiani ◽  
Yoga Satria Putra ◽  
Muhardi Muhardi
Keyword(s):  
Coarse Sand ◽  
Medium Sand ◽  
Purposive Sampling

Penelitian ini dilakukan dengan tujuan untuk mengetahui distribusi ukuran butir sedimen yang terangkut oleh besarnya kecepatan arus di perairan Sungai Pawan Kabupaten Ketapang. Pengambilan sampel dan pengukuran kecepatan arus dilakukan secara langsung (insitu). Penentuan lokasi penelitian dilakukan dengan menggunakan teknik purposive sampling.  Lokasi penelitian terbagi menjadi 5 stasiun dengan 3 titik pengamatan di setiap stasiun yang dilakukan selama 3 hari. Analisis ukuran butir sedimen dilakukan berdasarkan ukuran diameter butir dan jenis. Hasil analisis ukuran diameter butir sedimen dari 15 titik sampel memberikan gambaran karakteristik sedimen. Sedimen didominasi oleh ukuran butir berkisar antara 0.24 – 1.96 mm, berupa pasir kasar (coarse sand) dan pasir sedang (medium sand). Sedangkan kecepatan arus di Sungai Pawan berkisar antara 0.15 – 0.59 m/s. Ukuran butir sedimen yang bertekstur kasar akan ditemukan pada daerah yang memiliki kecepatan arus yang relatif tinggi. Begitupun sebaliknya, ukuran butir sedimen yang bertekstur halus akan ditemukan pada daerah dengan kecepatan arus yang relatif rendah. Sehingga terlihat bahwa kecepatan arus mempengaruhi sebaran sedimen di suatu perairan Sungai Pawan.

scholarly journals Compositional and industrial assessment of Isua-Akoko, Akure, Ayadi and Lafe (Ode Aye) clay deposits of Ondo state, Nigeria

1970 ◽  
Vol 21 (1) ◽  
pp. 41-49
Author(s):  
O Adegbuyi ◽  
GP Ojo ◽  
AJ Adeola ◽  
MT Alebiosu
Keyword(s):  
Chemical Properties ◽  
Fine Sand ◽  
Coarse Sand ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Medium Sand ◽  
Southwestern Nigeria ◽  
Firing Test ◽  
Clay Deposits ◽  
Ondo State

The physical and chemical properties of clay deposits around Isua-Akoko, Akure, Lafe and Ayadi in Ondo State southwestern Nigeria have been examined. The results have shown that Isua-Akoko, Akure and Lafe Clays are plastic fire clays while Ayadi clay is kaolinite. Grain size analysis reveals that Isua Akoko Clay contains 45% of clay, 18% silt, 12% fine sand,14% medium sand and 11% coarse sand and no gravel; Akure clay contains 42% clay, 14% silt, 13% fine sand, 20% medium sand and 8% coarse sand with 1% gravel. Lafe Clay contains 21% clay, 8% silt, 25% fine sand, 37% medium sand and 8% coarse sand with 1% gravel while Ayadi clay contains 83% clay and 17% silt. The liquid limits of these clay samples range from 41% to 73%% and plastic limits range from 18% to 26% respectively. The chemical analysis reveals that the most abundant mineral is silica (60.97%) and aluminum was next in abundance (23.69%) while other oxides are low. The results show that Isua-Akoko and Akure are residual while Lafe and Ayadi are sedimentary and transported Clays. The firing test, PH, and bleaching tests of the clays are also discussed. The chemical and physical characteristics of the clay deposits are strongly indicative of their industrial importance in the production of ceramics, refractories, paving bricks, paint and pharmaceutical products.KEYWORDS: Kaolinite, fire clay, gravel, ceramics and alumina.

scholarly journals CHARACTERISTIC OF LITORAL SEDIMENT ON SINDULANG SATU COASTAL

2013 ◽  
Vol 1 (1) ◽  
pp. 48
Author(s):  
Junet I. S. Korwa ◽  
Esry T. Opa ◽  
Rignolda Djamaludin
Keyword(s):  
Coastal Area ◽  
Littoral Zone ◽  
Sea Water ◽  
Fine Sand ◽  
Coarse Sand ◽  
Water Infiltration ◽  
Physical Change ◽  
Medium Sand ◽  
Special Concern ◽  
Sand Material

Coastal area is defined as the interface point where sea and land meet. To the land the area is limited to the area influenced by the sea factors (wind, tide, and sea water infiltration), while to the sea is limited to the area influenced by the land factors. Special concern need to be addressed in regarding to the use of coastal area. As part of the coastal area, littoral zone is very dynamics due to factors of oceanography and human activities. The same fact is experienced by the littoral zone in Sindulang Satu. Physical change has been the fact in this littoral zone.  In relation to the change, it is considered of importance to describe and analysis the characteristics of the sediment and related oceanography factors.  Result of observation indicated that sediment in the littoral zone consist of fine sand, medium sand, very fine sand, coarse sand and pebbles. Silt and boulder were also found. Distribution of sediment granulometry showed that the littoral zone was dominated by fine sand material, bad sorted, asymetrical to small size and symmetrical granulometry, and mesokurtic. Tidal current is the type of current working in the littoral zone and it plays importance role in the sediment.

CHARACTERISTIC OF LITORAL SEDIMENT ON SINDULANG SATU COASTAL

2013 ◽  
Vol 1 (1) ◽  
pp. 48
Author(s):  
Junet I. S. Korwa ◽  
Esry T. Opa ◽  
Rignolda Djamaludin
Keyword(s):  
Coastal Area ◽  
Littoral Zone ◽  
Sea Water ◽  
Fine Sand ◽  
Coarse Sand ◽  
Water Infiltration ◽  
Physical Change ◽  
Medium Sand ◽  
Special Concern ◽  
Sand Material

Coastal area is defined as the interface point where sea and land meet. To the land the area is limited to the area influenced by the sea factors (wind, tide, and sea water infiltration), while to the sea is limited to the area influenced by the land factors. Special concern need to be addressed in regarding to the use of coastal area. As part of the coastal area, littoral zone is very dynamics due to factors of oceanography and human activities. The same fact is experienced by the littoral zone in Sindulang Satu. Physical change has been the fact in this littoral zone.  In relation to the change, it is considered of importance to describe and analysis the characteristics of the sediment and related oceanography factors.  Result of observation indicated that sediment in the littoral zone consist of fine sand, medium sand, very fine sand, coarse sand and pebbles. Silt and boulder were also found. Distribution of sediment granulometry showed that the littoral zone was dominated by fine sand material, bad sorted, asymetrical to small size and symmetrical granulometry, and mesokurtic. Tidal current is the type of current working in the littoral zone and it plays importance role in the sediment.  

scholarly journals Evaluation of hydrogeological conditions through vertical electrical soundings survey at Mankiganj pourashava, Manikganj, central part of Bangladesh

2016 ◽  
Vol 27 (2) ◽  
pp. 109-120 ◽  
Author(s):  
ASM Woobaidullah ◽  
M Moklesur Rahman ◽  
M Zohir Uddin
Keyword(s):  
Fine Sand ◽  
Coarse Sand ◽  
Silty Clay ◽  
Medium Sand ◽  
Arsenic Level ◽  
Near Surface ◽  
Tube Wells ◽  
Top Soil ◽  
Potable Water Supply ◽  
Electrical Soundings

The Pourashava area of Manikganj, located in the central part of Bangladesh is treated as arsenic hotspot in the country as the outcome of various studies concludes that almost 80% of the domestic tube wells at this area exceed arsenic level of Bangladesh standard (50 ?g/l) for drinking water. To enhance the potable water supply in the area, 15 geoelectric soundings survey using Schlumberger configuration with spreading AB/2 = 300 meters has been executed to decipher the subsurface lithology distribution and aquifers at different depths, to determine the lateral and vertical extent of aquifer at the area. Correlation of the analyzed VES results with primary and secondary borelogs, the subsurface sequence of the area is broadly divided into two geoelectric units. Firstly, the near surface geoelectric unit of resistivity less than 20.0 ?-m represents the top soil composed of silty clay to clay. The thickness of this layer varies from 1 meter to 5 meters. The second geoelectric unit represents the sand layer and is characterized by a resistivity range of 21.0 to 190.0 ?-m. This unit encompasses the very fine sand with variable thickness of 2 to 248m while resistivity is from 21.0 to 30.0 ?-m, very fine to fine sand having thickness from 174-280m and geoelectric value ranges from 31.0 to 40.0 ?-m, fine sand with resistivity from 44.0 to 50.0 ?-m, fine to medium sand having resistivity from 51.0 to 70.0 ?-m, medium sand and medium to coarse sand with resistivity value 75.0 to 110.0 ?-m, and 140.0 to 190.0 ?-m, respectively. The ultimate thickness of this unit could not be determined due to limited spread of survey but at least continues to a depth of 300 m. In the context of groundwater storage, the second geoelectric unit acts as the regional aquifer and is used for groundwater development in the Pourashava area for water supply.Bangladesh J. Sci. Res. 27(2): 109-120, December-2014

COMPARISON OF HEAT TRANSFER PROPERTIES OF DRY SAND AND MAGNESIUM OXIDE POWDER BY SINGLE-PROBE METHOD

2015 ◽  
Vol 77 (13) ◽  
Author(s):  
Markus Ndenah Linah ◽  
Osita C. Meludu ◽  
Moses Elisha Kundwal
Keyword(s):  
Heat Transfer ◽  
Magnesium Oxide ◽  
Coarse Sand ◽  
Probe Method ◽  
Electrical Heating ◽  
Medium Sand ◽  
Single Probe ◽  
Dry Sand ◽  
Transfer Properties ◽  
Insulating Properties

The use of magnesium oxide (MgO) powder in electrical heating appliances is based on its thermal and electrical insulating properties. However, dry sand, which is readily available and free on the surface horizon than MgO powder also possesses good thermal and electrical insulating properties that could be utilized in the fabrication of electrical heating devices. In this study, we determined and compared heat transfer properties of dry fine-medium sand (0.125-0.50 mm) and dry coarse sand (0.50-1.00 mm) with those of MgO powder, using the single-probe method. Electrical heating equipment was designed and fabricated with a heating element that generated a heat flux of 18.05Wm-1. From the results obtained, the thermal conductivities of dry fine-medium sand, dry coarse sand and MgO powder were found to be 0.21 m-1K-1, 0.22 Wm-1K-1 and 0.36 Wm-1K-1 respectively. Temperature increase per second were also obtained and found to be 4.75 × 10-2 Ks-1 in dry fine-medium sand, 4.28 × 10-2  Ks-1 in dry coarse sand and 2.03 × 10-2  Ks-1 in MgO powder. Thus, while it took MgO powder 472 s to warm from 30 oC to 40 oC, it took dry coarse sand and dry fine-medium sand only 229 s and 205 s respectively to warm through the same temperature range.

A STUDY OF THE MINERALOGICAL COMPOSITION OF SAND IN SOUTHERN ONTARIO

1959 ◽  
Vol 39 (2) ◽  
pp. 185-196 ◽  
Author(s):  
Carol I. Dell
Keyword(s):  
Mineralogical Composition ◽  
Fine Sand ◽  
Coarse Sand ◽  
Heavy Minerals ◽  
Plant Nutrient ◽  
Coarse Silt ◽  
Medium Sand ◽  
Sand Fraction ◽  
Southern Ontario ◽  
Mineralogical Study

A mineralogical study of the fine sand fraction of unweathered tills and stratified sands chosen to represent the deposits of the major ice lobes of southern Ontario was carried out. In addition, a few analyses were made of the coarse silt and coarser sands.In general there was the same variety of minerals in all samples and they varied only in their proportions. Tills overlying Palaeozoic bedrock contained abundant carbonates and shale fragments constituting up to 70 per cent of some fine sands. In the coarse sands, carbonates and shale increased sharply. In the coarse silt and fine sand, feldspars were more abundant than quartz whereas in the medium and coarse sand the reverse was true. Quartz increased in quantity with increasing grain size and reached a maximum in the medium sand. Heavy minerals usually constituted less than 15 per cent of the fine sand. Some of the minerals present in the coarse silt and fine sand were not found in the coarser sands. Usually the order of abundance of the heavy minerals was: hornblende, garnet, micas, magnetite, pyroxenes and sphene. Epidote, rutile, apatite, tourmaline, staurolite, kyanite and others were also noted. A chart listing the plant nutrient elements found in these minerals was prepared.

Application and Research on Material Properties of Sand Consolidating Agent

2011 ◽  
Vol 99-100 ◽  
pp. 1186-1190 ◽  
Author(s):  
Shen Gang Li ◽  
Wen Zhao ◽  
Di Wu ◽  
You Ping Li
Keyword(s):  
Particle Size ◽  
Material Properties ◽  
Fine Sand ◽  
Coarse Sand ◽  
Cement Grout ◽  
Engineering Property ◽  
Reinforcement Effect ◽  
Medium Sand ◽  
Component Particle

To inject in coarse sand strata and medium sand strata with cement grout is difficult in subway engineering. To test the component, particle size and viscosity of THE II sand consolidation agent ,the engineering property is got.To calculate the groutability of the grout material in gravel sand strata, coarse sand strata , medium sand strata and fine sand strata of Shenyang strata,it is feasible to inject the grout material into shenyang sandy strata.Research and engineering indicate that the grout material is high groutable and the reinforcement effect is good.

scholarly journals Water Retention in Root-zone Soil Mixtures of Layered Profiles Used for Sports Turf

HortScience ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 82-85 ◽  
Author(s):  
D.H. Taylor ◽  
C.F. Williams ◽  
S.D. Nelson
Keyword(s):  
Water Distribution ◽  
Water Retention ◽  
Root Zone ◽  
Coarse Sand ◽  
Sand Particle ◽  
Soil Profiles ◽  
Medium Sand ◽  
Excess Water ◽  
Retention Characteristics ◽  
Textured Materials

Where coarse-textured materials, such as gravel, underlie the root-zone layer of sports turf soil profiles, water retention in the root-zone layer is increased. The objective of this research was to determine the water retention characteristics in sand and sand: peat mixtures placed over coarse-textured layers and to determine how sand particle size and type of peat in the mixtures influenced water distribution after drainage. Soil profiles consisted of 30 cm of sand or sand: peat mixtures over 5 cm of predominantly coarse and very coarse sand, which in turn was over 10 cm of gravel. Excess water was added to the profile and allowed to drain for 24 or 48 h, following which water content and air-filled porosity (AFP) in the mixtures were evaluated. Regardless of the root-zone mixture, the coarse-textured sublayers resulted in a wet zone in the lower portion of the root-zone mixture. An unamended, predominantly medium and coarse sand, when used in the 30- cm root-zone layer, maintained ≈10% AFP in the lower 6 cm after drainage. Sand: peat mixtures using this sand generally maintained 3% to 8% AFP in the lower 12 cm of the root-zone layer. An unamended, predominantly fine and medium sand root-zone layer had ≈6% AFP in the lower 9 cm and sand: peat mixtures using this sand had <5% AFP in the lower 12 to 18 cm of the root-zone layer, with significant portions remaining at or near saturation after 24 or 48 h of drainage.

Niveo-aeolian sand deposits on An Teallach, Wester Ross, Scotland

1987 ◽  
Vol 78 (1) ◽  
pp. 51-63 ◽  
Author(s):  
Colin K. Ballantyne ◽  
Graeme Whittington
Keyword(s):  
Vegetation Cover ◽  
Source Area ◽  
Coarse Sand ◽  
Substantial Proportion ◽  
Medium Sand ◽  
Aeolian Sand ◽  
Aeolian Deposits ◽  
Windblown Sand ◽  
Sand Accumulation

ABSTRACTDeposits of windblown sand up to 4 m thick on the Torridon Sandstone massif of An Teallach are shown to be of predominantly niveo-aeolian origin, a form of sedimentation hitherto unrecognised in upland Britain. Sand grains weathered from bedrock and from exposed clasts on plateau areas are blown on to the winter snowpack on surrounding slopes. When the snow melts, the grains are lowered on to the underlying vegetation, which traps the sand and thus allows a stable deposit to accumulate. The deposits formed in this way are massive, poorly sorted and coarser than most aeolian deposits, comprising mainly medium sand (212–600μm) with a substantial proportion of coarse sand and even very small pebbles. The coarseness and poor sorting of the sands reflect the size of grains available for transportation, the strength of the wind, short transport distances and admixture of different grades of sand during deposition. Sand accumulation began in the Early Flandrian before c. 7900 BP, but was eventually much reduced by the establishment of vegetation cover over the plateau source area. Recent disruption of this vegetation cover triggered either by increased storminess or overgrazing resulted in extensive erosion of sand deposits on the plateau and their redeposition on surrounding slopes. Niveo-aeolian deposition continues on lee slopes at present, but is offset by erosion of unvegetated scarps at the margins of the deposits.

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