The sediment load and deposition by river discharge and their relation to organochlorine pesticides pollutants in the sediment bottom of Nha Trang Bay, Vietnam

2015 ◽  
Vol 50 (2) ◽  
pp. 455-466 ◽  
Author(s):  
Hoang Trung Du ◽  
Andreas Kunzmann
Keyword(s):  
Organochlorine Pesticides ◽  
River Discharge ◽  
Sediment Load ◽  
Nha Trang Bay ◽  
Sediment Bottom

Mass balance controls on sediment scour and bedrock erosion in waterfall plunge pools

Geology ◽  
2021 ◽  
Author(s):  
Joel S. Scheingross ◽  
Michael P. Lamb
Keyword(s):  
Sediment Transport ◽  
Mass Balance ◽  
River Discharge ◽  
Sediment Load ◽  
Sediment Flux ◽  
Habitat Availability ◽  
Flux Divergence ◽  
Plunge Pool ◽  
Bedrock Erosion ◽  
Recurrence Intervals

Waterfall plunge pools experience cycles of sediment aggradation and scour that modulate bedrock erosion, habitat availability, and hazard potential. We calculate sediment flux divergence to evaluate the conditions under which pools deposit and scour sediment by comparing the sediment transport capacities of waterfall plunge pools (Qsc_pool) and their adjacent river reaches (Qsc_river). Results show that pools fill with sediment at low river discharge because the waterfall jet is not strong enough to transport the supplied sediment load out of the pool. As discharge increases, the waterfall jet strengthens, allowing pools to transport sediment at greater rates than in adjacent river reaches. This causes sediment scour from pools and bar building at the downstream pool boundary. While pools may be partially emptied of sediment at modest discharge, floods with recurrence intervals >10 yr are typically required for pools to scour to bedrock. These results allow new constraints on paleodischarge estimates made from sediment deposited in plunge pool bars and suggest that bedrock erosion at waterfalls with plunge pools occurs during larger floods than in river reaches lacking waterfalls.

Responses of river discharge and sediment load to climate change in the transboundary Mekong River Basin

2019 ◽  
Vol 34 (S1) ◽  
pp. 367-380
Author(s):  
Dao Nguyen Khoi ◽  
Van Thinh Nguyen ◽  
Truong Thao Sam ◽  
Nguyen Ky Phung ◽  
Nguyen Thi Bay
Keyword(s):  
Climate Change ◽  
River Basin ◽  
River Discharge ◽  
Sediment Load ◽  
Mekong River ◽  
Mekong River Basin

River suspended sediment load prediction based on river discharge information: application of newly developed data mining models

2020 ◽  
Vol 65 (4) ◽  
pp. 624-637 ◽  
Author(s):  
Sinan Q. Salih ◽  
Ahmad Sharafati ◽  
Khabat Khosravi ◽  
Hossam Faris ◽  
Ozgur Kisi ◽  
...  
Keyword(s):  
Data Mining ◽  
Suspended Sediment ◽  
River Discharge ◽  
Sediment Load ◽  
Suspended Sediment Load ◽  
Load Prediction

scholarly journals Effects of Dam Regulation on the Hydrological Alteration and Morphological Evolution of the Volta River Delta

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 646 ◽  
Author(s):  
Mawusi Amenuvor ◽  
Weilun Gao ◽  
Dongxue Li ◽  
Dongdong Shao
Keyword(s):  
River Discharge ◽  
Sediment Load ◽  
Morphological Evolution ◽  
River Delta ◽  
Small Range ◽  
Quasi Equilibrium ◽  
Regulated Rivers ◽  
Annual Variations ◽  
Hydrological Alteration ◽  
The Relationship

The Volta River in West Africa is one of the most regulated rivers influenced by dams in the world, and the regulation has resulted in substantial impacts on the hydrological alteration and morphological evolution of the Volta River Delta. However, comprehensive analyses of the relevant effects are still lacking to date. In this study, inter-annual variations of river discharge and sediment load for pre- and post-Akosombo Dam periods (1936 to 2018) were analyzed through simple regression and Mann–Kendall (MK) trend analysis whereas the intra-annual variations were dictated by the non-uniformity and regulated coefficients. The shoreline changes were further evaluated using Landsat remote sensing images (1972 to 2018) to explore the effects of hydrological alteration on the morphological evolution of the Volta River Delta. Hydrological analyses show that the inter- and intra-annual variations are much higher in the pre-dam period, suggesting the substantial regulation of the Akosombo Dam on the Volta River. The dam regulation has more significant effects on the sediment load delivered to the delta than the river discharge, which decreased by 92.32% and 23.23%, respectively. Morphological analyses show that the progradation-erosion of the Volta River Delta constantly fluctuates within a relatively small range (maximum 0.5%) after the 1970s. The relationship between the variations of the delta area and sediment load implicates that a quasi-equilibrium state may have been established at the Volta River Delta, given the current sediment load. Our findings provide references for the future regulation and restoration of the Volta River Delta.

Impacts on River Discharge of Changes in Glacierized Components of Mountain Basins

1987 ◽  
Vol 22 (4) ◽  
pp. 518-529 ◽  
Author(s):  
Peter G. Johnson ◽  
Claude David
Keyword(s):  
Water Quality ◽  
River Discharge ◽  
Climate Changes ◽  
Sediment Load ◽  
Flow Regimes ◽  
Sediment Concentration ◽  
Time Frame ◽  
Mountainous Regions ◽  
Mountain Basins ◽  
High Level

Abstract A reliable and predictable water supply is essential to any development in mountainous regions. Large glacierized components of basins can produce surplus or deficit conditions as climate changes from season to season and as the ice extent fluctuates through time. Shorter time frame glaciological changes can produce stream diversion, catastrophic floods or very Irregular flow regimes. The major impact on water quality is the high level of and variations in sediment load concentrations which occur with the regime fluctuations. Sediment concentration regimes occur both in phase and out of phase with flow regimes.

Large deltas versus small deltas: Two different beasts

2021 ◽  
Author(s):  
Jaia Syvitski
Keyword(s):  
River Discharge ◽  
Sediment Load ◽  
Sediment Supply ◽  
Human Interaction ◽  
Small Scale ◽  
Human Populations ◽  
Anthropogenic Influences ◽  
Ocean Energy ◽  
Coastal Deposits

<p>Many studies rank deltas as a continuum, as conditioned by hinterland drainage area, river discharge, sediment load, ocean energy, or even human interaction.  This scaling has helped advance our understanding on how these important coastal deposits develop. From such studies, equilibrium states have been identified, such as the balance between sediment supply and the subsequent dispersal of incoming sediment.  Conceptual equations are used to track the influence of changing boundary conditions such as sea level rise (or fall) that can then expose the role of anthropogenic influences such as groundwater mining.  However, scaling may not reveal important differences between small-scale deltas, that globally number in the thousands, and large regional deltas that number in the dozens.  For example backwater effects appear important in large delta systems but can often be ignored in many smaller delta systems with steeper fluvial gradients. Large deltas are home to large human populations and their infrastructure, but does this influence scale with delta size? This overview presentation explores the use of conceptual equations to determine if there is a limit to scaling.</p>

scholarly journals Total Suspended Load and Sediment Yield of Kayan River, Bulungan District, East Kalimantan

2016 ◽  
Vol 19 (2) ◽  
pp. 115
Author(s):  
Suprapto Dibyosaputro
Keyword(s):  
Statistical Analysis ◽  
Suspended Sediment ◽  
Sediment Yield ◽  
River Discharge ◽  
Sediment Load ◽  
Climatic Data ◽  
Observation Data ◽  
Suspended Sediment Load ◽  
East Kalimantan ◽  
Total Sediment

This research was carried out the the drainage system of Kayan river, Bulungan District, East Kalimantan. The purpose of the research were to study the physical conditions of the Kayan catchment area, calculate the suspended sediment load, and to define the total sediment yield of Kayan River. Observation method were used in this research both of direct field observation as well as laboratory observation. Data acquired in this study were include of climatic data, geology, geomorphology, soil and land cover data. Besides also rain-fall data, temperature, river discharge and suspended sediment load. The total sediment yield were calculated by mean of mathematical and statistical analysis especially of linier regression analysis. The result of the research show that total the sediment yield of Kayan River with drainage area of 6,329.452 km² is about 236,921.25 m³/km²/year. The interesting result of the statistical analysis was that the existing negative correlation between river discharge and suspended sediment load. It is the effect of the location of discharge and suspended measurement. This condition caused by sea tide effect on river discharge at the apex delta. During high tide water river trend rising up on discharge but not on suspended sediment load. Instead, also existing setting down processes takes places of the suspended sediment load into the river bottom upper stream and the apex.

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