Analysis and modeling of the percussion coring of an innovative hydrostatic sediment corer

2017 ◽  
Vol 134 ◽  
pp. 87-95 ◽  
Author(s):  
Jianjun Wang ◽  
Huawei Qin ◽  
Ying Chen
Keyword(s):  
Sediment Corer

Reliability Assessment of the Water Distributing Valve of a Hydrostatic Sediment Corer

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Huawei Qin ◽  
Hangmin Hu ◽  
Wei Ye ◽  
Jianjun Wang ◽  
Zhen Cai ◽  
...  
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Atmospheric Pressure ◽  
Failure Modes ◽  
Reliability Assessment ◽  
Ambient Water ◽  
Ambient Seawater ◽  
Future Improvement ◽  
Potential Pressure ◽  
Sediment Corer

The hydrostatic corer is designed for sampling sediment from the seafloor. Its operation relies on a water distributing valve which converts the potential pressure difference between ambient seawater and a built-in chamber with atmospheric pressure to the dynamic energy as the driving power. As the valve is exposed to the ambient water, the deformation of its components may exceed their fitting tolerance under the high pressure and low temperature on seafloor, and thus cause the failure of the valve. Three possible failure modes have been taken into account, representing the positions where interference of fitting tolerance is likely to occur. Corresponding models are then created considering the coupled effects of pressure and temperature on the valve. Based on the model results and the reliability requirement of the corer, one failure mode is selected to calculate the reliability of the valve and is used as guidance for the future improvement of the design.

Improvements in a plastic-barrel sediment corer

1979 ◽  
Vol 1 (1) ◽  
pp. 61-62 ◽  
Author(s):  
Douglas N. Lambert ◽  
George F. Merrill
Keyword(s):  
Sediment Corer

scholarly journals Distribution and Seasonal Variation of Microplastics in Tallo River, Makassar, Eastern Indonesia

Toxics ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 129
Author(s):  
Ega Adhi Wicaksono ◽  
Shinta Werorilangi ◽  
Tamara S. Galloway ◽  
Akbar Tahir
Keyword(s):  
Seasonal Variation ◽  
Sediment Samples ◽  
Eastern Indonesia ◽  
Potential Source ◽  
Water And Sediment ◽  
Main River ◽  
Spatial Trends ◽  
Riverine Environment ◽  
The Common ◽  
Sediment Corer

Attention towards microplastic (MP) pollution in various environments is increasing, but relatively little attention has been given to the freshwater-riverine environment. As the biggest city in the eastern Indonesia region, Makassar can be a potential source of MP pollution to its riverine area. This study aimed to determine the spatial trends, seasonal variation, and characteristics of MPs in the water and sediment of Tallo River, as the main river in Makassar. Water samples were collected using a neuston net and sediment samples were collected using a sediment corer. The samples collected contained MPs with an abundance ranging from 0.74 ± 0.46 to 3.41 ± 0.13 item/m3 and 16.67 ± 20.82 to 150 ± 36.06 item/kg for water and sediment samples, respectively. The microplastic abundance in the Tallo River was higher in the dry season and tended to increase towards the lower river segment. Fragments (47.80–86.03%) and lines (12.50–47.80%) were the predominant shapes, while blue (19.49–46.15%) and transparent (14.29–38.14%) were the most dominant color. Polyethylene and polypropylene were the common MP polymers found in the Tallo river. Actions to prevent MP pollution in the Makassar riverine area are needed before MP pollution becomes more severe in the future.

The HON-Kajak sediment corer

1991 ◽  
Vol 6 (2) ◽  
pp. 167-170 ◽  
Author(s):  
Ingemar Renberg
Keyword(s):  
Sediment Corer

scholarly journals A Study of Nutrient Distribution in Sediment Layer at Sembrong Dam

2018 ◽  
Vol 150 ◽  
pp. 03009
Author(s):  
SH Abu Talib ◽  
SIN Syed Hashim ◽  
MS Abustan
Keyword(s):  
Water Quality ◽  
Water Source ◽  
Agricultural Activity ◽  
Sediment Layer ◽  
Hydroelectric Power ◽  
Nutrient Distribution ◽  
Aquatic Life ◽  
Periodic Monitoring ◽  
Water And Wastewater ◽  
Sediment Corer

Reservoir is one of the key sources of water supply as it provides hydroelectric power, domestic usage, agriculture, farming, recreation and provides flood protection. Sedimentation in the reservoir makes the storage of water loss and the sediment sink contain a source of nutrients. Sediment deposition creates habitats for aquatic life but if too much sediment, it can destroy their habitats and even physically alter a waterway. The use of nutrients such as Total Phosphorus (TP) is key to growing plants and animals thus to feed growing populations. An excess of nutrients in the reservoir such as from agricultural activity makes algae growth rapidly and it can affected the water quality in the reservoir. This research was conducted at the Sembrong dam as this dam is a major water source for people in Kluang and parts Batu Pahat and the water quality become decreased because of algae bloom. The main objective of this study is to determine the distribution of nutrient in different location and to determine the nutrient distribution in vertical sediment layer. The study were conducted by taking sediments samples throughout the reservoir by using sediment corer and the sediment have been sliced every 5 cm. The samples were digested using USEPA Method 3050B which is acid digestion for sediments, sludge and soil for TP. The laboratory testing on these nutrients was conducted by following Standard Method for the Examination of Water and Wastewater (APHA, 1999) using spectrophotometer. The highest value of TP obtain is at outlet of the reservoir which is 30.72 mg/l. The results obtained shows that the top of sediment has high number of TP and it decreasing by depth. However, continuous and periodic monitoring should be done to avoid the increasing of the concentration of TP in the sediment to ensure the life of Sembrong dam can be extending for future.

Implementation of a Seafloor Sediment Corer With a Novel Hydrostatic Motor

2012 ◽  
Vol 46 (4) ◽  
pp. 40-47 ◽  
Author(s):  
Jianjun Wang ◽  
Huawei Qin ◽  
Ying Chen
Keyword(s):  
High Pressure ◽  
East China Sea ◽  
Deep Sea ◽  
East China ◽  
The East China Sea ◽  
Energy Transmission ◽  
Pile Driver ◽  
Mechanical Linkage ◽  
Sediment Corer ◽  
Seafloor Sediment

AbstractThis work deals with the design and application of a seafloor sediment corer with a novel hydrostatic motor. The motor uses seawater pressure energy as the power for the penetration by the sediment corer. It is automatically triggered by mechanical linkage when the corer lands on the seafloor, enabling the corer to accomplish an initial gravity penetration before the motor is activated. As a key feature of the motor, a hydraulically actuated valve is employed to control the transfer of ambient high-pressure seawater to a vacant chamber. Driven by the pressure transfer, the corer head continuously repeats movements of lifting and lowering, analogous to a pile driver. Since the motor directly uses the seawater as the energy transmission medium, the corer can be very compact in size. The prototype of the sediment corer with the motor was tested in the East China Sea at a depth of 90 m on September 25, 2011. The results of the experiment show that the corer is able to complete nearly 42 hammering action cycles. This demonstrates the feasibility of the seafloor sediment corer with the hydrostatic motor. By extrapolation, the application of the system to deep sea environs, such as at 1,000 m depths, is shown to be feasible as well.

A plastic-barrel sediment corer

1961 ◽  
Vol 8 (3-4) ◽  
pp. 306-312 ◽  
Author(s):  
Adrian F. Richards ◽  
George H. Keller
Keyword(s):  
Sediment Corer
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