scholarly journals Suspended sediment distribution corresponds to erosion and deposition processes at Bengawan Solo River, Indonesia

2019 ◽  
Author(s):  
Mahendra Andiek Maulana ◽  
Trihanyndio Rendy Satrya ◽  
Ria Asih Aryani Soemitro ◽  
Dwa Desa Warnana ◽  
Toshifumi Mukunoki
Keyword(s):  
Suspended Sediment ◽  
Erosion And Deposition ◽  
Sediment Distribution ◽  
Deposition Processes

scholarly journals Suspended sediment distribution under varied currents in the largest river-connected lake of China

2017 ◽  
Vol 18 (3) ◽  
pp. 994-1004 ◽  
Author(s):  
Hua Wang ◽  
Yijun Zhao ◽  
Fengnian Zhou ◽  
Huaiyu Yan ◽  
Yanqing Deng ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Suspended Sediment ◽  
Flow Patterns ◽  
Field Investigation ◽  
Gravity Flow ◽  
Shear Stresses ◽  
Sediment Distribution ◽  
Back Flow ◽  
The North ◽  
Dry Seasons

Abstract Poyang Lake was selected as the research area. Based on laboratory experiment, field investigation and numerical simulation, the spatial distributions of suspended sediment (SS) under the gravity-flow, jacking-flow and back-flow patterns were quantitatively analysed. An annular flume experiment was conducted to determine the critical starting shear stresses of the sediments in the flood and dry seasons. By numerical experiment, the SS transport under different flow patterns was explored. Several results stand out. (1) The critical starting shear stresses of the sediments in the flood and dry seasons were 0.35 N·m−2 and 0.29 N·m−2, respectively. (2) Due to the strongest flow disturbance and scouring effect, SS under the gravity-flow pattern was characterized by the highest loads. The lowest SS was observed during the jacking-flow pattern, which could be attributed to the lowest water level gap between the lake and external rivers. The loads ranged from 0.053 kg·m−3 to 0.068 kg·m−3. (3) Under the back-flow pattern, SS in the north lake was evidently influenced by the Yangtze River, and the mean value was approximately 0.12 kg·m−3. With the gradually weakened back-flow impact, the SS load was decreased from the north to the middle of the lake.

Organic near-bed fluid and particulate transport in combined sewers

1995 ◽  
Vol 31 (7) ◽  
pp. 61-68 ◽  
Author(s):  
E. Ristenpart ◽  
R. M. Ashley ◽  
M. Uhl
Keyword(s):  
Bed Load ◽  
Erosion And Deposition ◽  
Sediment Bed ◽  
Solids Transport ◽  
Particulate Transport ◽  
Sediment Deposits ◽  
Dense Fluid ◽  
Deposition Processes ◽  
Continuous Field ◽  
Heterogeneity Of Solids

Studies in Germany, Belgium, France and Scotland have revealed that there are significant solids transport gradients in the depth of foul and combined sewage flows. Continuous field observations of changes in depths of sediment deposits in combined sewers have also indicated that there is an interaction between the erosion and deposition processes and changes in the mass transport of solids in regions in the overlying flow. A fuller understanding of the interactive phenomena is essential for both sewer sediment management and the minimization of associated pollution from wash-out of solids via CSOs. The paper presents results from the detailed studies in Hildesheim, Germany and those carried out in Dundee, Scotland, investigating the heterogeneity of solids movement with regard to gross solids, erosion of sewer sediments and their interactions with the suspended transport phases and the layer of very dense fluid found to be transported under certain circumstances, near the sediment bed or sewer invert (traditionally called ‘bed-load’).

EROSION AND DEPOSITION PROCESSES IN TOKAMAKS

1989 ◽  
pp. 151-166 ◽  
Author(s):  
G.M. MCCRACKEN ◽  
P.C. STANGEBY ◽  
C.S. PITCHER ◽  
D.H.J. GOODALL ◽  
P. Komarek
Keyword(s):  
Erosion And Deposition ◽  
Deposition Processes

scholarly journals The erosion–deposition process and associated control mechanisms of the Nanliu River subaqueous delta, Southern China coast

2019 ◽  
Vol 2 (1) ◽  
pp. 171-192 ◽  
Author(s):  
Zhen-Kun Lin ◽  
Ai-Jun Wang ◽  
Xiang Ye
Keyword(s):  
Suspended Sediment ◽  
Southern China ◽  
Sediment Resuspension ◽  
Field Measurements ◽  
Deposition Process ◽  
Sediment Concentration ◽  
Control Mechanisms ◽  
Erosion Coefficient ◽  
Deposition Processes ◽  
Dimensional Simulation

Understanding the erosion–deposition process of sediments and the associated controlling mechanisms in subaqueous deltas is important for coastal environment protection. In this study, field observations and numerical simulations were performed for the Nanliu River subaqueous delta in Guangxi Province (Southern China) to investigate the sediment dynamic processes at the bottom boundary layer. The results show that the sediment resuspension mainly occurs during periods of spring tides and is mainly controlled by the wave action. When the seabed is free from erosion, suspended sediment settling caused by lateral transport is an important source of maintaining near bed suspended sediment concentration. It was also found that increasing the shear parameter could facilitate the formation of flocs, after which the small flocs tend to merge to large flocs. Finally, by performing a consistency analysis between the seabed erosion and deposition processes obtained from numerical simulation, and the changes of seabed level recorded by the equipment during the field observation, we determined that the local erosion coefficient was 5 × 10−5 kg/m2·s. The one-dimensional simulation is also capable of revealing the general trend at the seabed where it is first subjected to erosion and then deposition, as indicated during the field measurements.

Dominant Factors Influencing Overall Temporal Sedimentation Rates at Loagan Bunut Lake, Miri, Sarawak, Malaysia.

2011 ◽  
Vol 356-360 ◽  
pp. 2406-2415 ◽  
Author(s):  
R.B. Dagang ◽  
S. Lau ◽  
A.K. Sayok
Keyword(s):  
Suspended Sediment ◽  
Sedimentation Rate ◽  
Settling Velocity ◽  
Flood Plain ◽  
Water Volume ◽  
Sedimentation Rates ◽  
Sediment Distribution ◽  
Factors Influencing ◽  
Physical Changes ◽  
Best Fit

This paper is to predict dominant factors influencing temporal sedimentation rates at Loagan Bunut Lake using best-fit model of sedimentation rate and distance from Bunut River. The lake is a flood plain lake located in Sarawak, Malaysia. Twenty two cylindrical traps were installed at the lake from November 2005 until April 2008. Each sample was collected after about four to five months of deployment. Dry sedimentation rates from the traps and the linear distances from Trap 1 located at the confluence of Bunut River were measured. The factors that influence the temporal sedimentation at the lake were both internal and external physical changes of the lake. The factors were net ws (net Stoke’s settling velocity) and water volume in the lake for suspended sediment distribution.

scholarly journals SEDIMENT TRANSPORT ON THE SOUTH-EAST AUSTRALIAN CONTINENTAL SHELF

1984 ◽  
Vol 1 (19) ◽  
pp. 131 ◽  
Author(s):  
Angus D. Gordon ◽  
John G. Hoffman
Keyword(s):  
Sediment Transport ◽  
Continental Shelf ◽  
Suspended Sediment ◽  
Transport System ◽  
Sediment Concentration ◽  
High Energy ◽  
Sediment Distribution ◽  
Sediment Movement ◽  
Shelf Sediment ◽  
Sea Bed

Engineering projects on the continental shelf off Sydney, Australia, have stimulated investigation into the sediment transport system of the shelf. Investigation activities associated with these projects have included: definition of sea bed morphology, sediment distribution and bedform characteristics; monitoring of steady and wave induced currents; wind data collection; suspended sediment sampling; bottom camera sediment movement investigations and analytical studies of sediment reaction to sea bed forcing functions. Sea bed velocity exceedence relationships for both wave oscillations and steady currents have been determined at depths of 24 m, 60 m and 80 m. Thresholds of sediment movement have been defined. Relative sediment transport computations have been undertaken and studies of suspended sediment concentration profiles are in progress so that absolute transport rates can be determined. The prevailing conditions, which include a mainly south bound current, are seldom sufficient to induce entrainment of shelf sediments. Transport events mainly result from major storms in the Tasman Sea which produce both high energy waves and north bound currents. Although these events are rare and short lived, the combined wave and current shear produced at the sea bed during the events gives rise to entrainment conditions which result in their dominance of the shelf sediment transport system.

Sign in / Sign up

Export Citation Format

Share Document