scholarly journals Combining suspended sediment monitoring and fingerprinting to determine the spatial origin of fine sediment in a mountainous river catchment

2011 ◽  
Vol 36 (8) ◽  
pp. 1072-1089 ◽  
Author(s):  
Olivier Evrard ◽  
Oldrich Navratil ◽  
Sophie Ayrault ◽  
Mehdi Ahmadi ◽  
Julien Némery ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Fine Sediment ◽  
River Catchment ◽  
Mountainous River ◽  
Sediment Monitoring

Global uncertainty analysis of suspended sediment monitoring using turbidimeter in a small mountainous river catchment

2011 ◽  
Vol 398 (3-4) ◽  
pp. 246-259 ◽  
Author(s):  
O. Navratil ◽  
M. Esteves ◽  
C. Legout ◽  
N. Gratiot ◽  
J. Nemery ◽  
...  
Keyword(s):  
Uncertainty Analysis ◽  
Suspended Sediment ◽  
River Catchment ◽  
Global Uncertainty ◽  
Mountainous River ◽  
Sediment Monitoring

Determining Sub-Catchment Contributions to the Suspended Sediment load of the Tsitsa River, Eastern Cape, South Africa

2020 ◽  
Author(s):  
Laura Bannatyne ◽  
Ian Foster ◽  
Ian Meiklejohn ◽  
Bennie van der Waal
Keyword(s):  
South Africa ◽  
Developing Countries ◽  
Suspended Sediment ◽  
Sediment Load ◽  
Fine Sediment ◽  
Eastern Cape Province ◽  
Suspended Sediment Load ◽  
Eastern Cape ◽  
Catchment Scale ◽  
River Catchment

<p>In South Africa, as in many developing countries, the suspended sediment (SS) data required to support catchment scale hillslope restoration and rehabilitation programmes are typically scarce or absent, leading to a reliance on modelled SS loads and yields that are generally not validated by measured SS data. An exception is the Tsitsa River catchment in the Eastern Cape Province, where modelled SS yields were high (21 – 50 t/ha/yr), leading to the establishment of a Citizen Technician-based monitoring programme (2015 – 2019) that has provided flood-focused, sub-catchment scale SS data at sub-daily timestep for 11 sites throughout the 4000 km<sup>2</sup> catchment.</p><p>A confluence-based SS fingerprinting and tracing exercise was undertaken in the catchment (2018). Analysis of the distinctive physicochemical properties of resuspended fine sediment sampled above and below major confluences allowed the percentage of SS contributed by each tributary to be apportioned, and compared with findings from both the SS monitoring campaign and from existing models.</p>

scholarly journals Fine Sediment Modeling During Storm-Based Events in the River Bandon, Ireland

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1523 ◽  
Author(s):  
Juan T. García ◽  
Joseph R. Harrington
Keyword(s):  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration ◽  
Fine Sediment ◽  
Storm Event ◽  
Storm Events ◽  
Event Scale ◽  
Model Based ◽  
Sediment Volume ◽  
Bed Erosion

The River Bandon located in County Cork (Ireland) has been time-continuously monitored by turbidity probes, as well as automatic and manual suspended sediment sampling. The current work evaluates three different models used to estimate the fine sediment concentration during storm-based events over a period of one year. The modeled suspended sediment concentration is compared with that measured at an event scale. Uncertainty indices are calculated and compared with those presented in the bibliography. An empirically-based model was used as a reference, as this model has been previously applied to evaluate sediment behavior over the same time period in the River Bandon. Three other models have been applied to the gathered data. First is an empirically-based storm events model, based on an exponential function for calculation of the sediment output from the bed. A statistically-based approach first developed for sewers was also evaluated. The third model evaluated was a shear stress erosion-based model based on one parameter. The importance of considering the fine sediment volume stored in the bed and its consolidation to predict the suspended sediment concentration during storm events is clearly evident. Taking into account dry weather periods and the bed erosion in previous events, knowledge on the eroded volume for each storm event is necessary to adjust the parameters for each model.

scholarly journals Comparative Assessment of Fluvial Suspended Sediment Concentration Analysis Methods

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 873 ◽  
Author(s):  
Flóra Pomázi ◽  
Sándor Baranya
Keyword(s):  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Acoustic Doppler Current Profiler ◽  
Sediment Concentration ◽  
Comparative Assessment ◽  
Danube River ◽  
Suspended Sediment Transport ◽  
Indirect Methods ◽  
Analysis Methods ◽  
Sediment Monitoring

The monitoring of fluvial suspended sediment transport plays an important role in the assessment of morphological processes, river habitats, or many social activities associated with river management. However, establishing and operating a well-functioning sediment monitoring system requires the involvement of advanced indirect methods. This study investigates the advantages and limitations of optical and acoustic devices, to quantify the uncertainties and provide a comprehensive comparative assessment of the investigated indirect methods. The novelty of this study, compared to previous ones, is that four different indirect techniques are parallel tested, i.e., the laser diffraction based LISST-Portable|XR, an infrared based optical instrument, the VELP TB1 turbidimeter, the acoustic based LISST-ABS (Acoustical Backscatter Sensor) sensor, and a 1200 kHz Teledyne RD Instruments Acoustic Doppler Current Profiler (ADCP). The calibration of all the indirect methods was performed based on more than 1000 samples taken from the Hungarian section of the Danube River within a wide suspended sediment concentration range. Implementing a comparative assessment of the different sediment analysis methods, a qualitative and quantitative characterisation of the applicability is provided. Furthermore, a proposal for an optimised sediment monitoring methodology is also suggested.

The Spatiotemporal Variations of Suspended Sediment Concentration in Le’an River Catchment of Poyang Lake Basin

2012 ◽  
Vol 610-613 ◽  
pp. 1099-1102 ◽  
Author(s):  
Zhen Wang ◽  
Qi Zhang ◽  
Xiu Li Xu ◽  
Hai Ying Gao
Keyword(s):  
Suspended Sediment ◽  
Poyang Lake ◽  
Arable Land ◽  
Sediment Concentration ◽  
Average Concentration ◽  
Lake Basin ◽  
Rainfall Events ◽  
River Catchment ◽  
Poyang Lake Basin ◽  
Different Seasons

Suspended sediment (SS) is one of the important parameters quantifying the degree of water pollution. In order to explore the spatiotemporal variation of the SS in Le’an river catchment, an important sub-catchment of Poyang lake basin, a total of 17 sampling points at rivers were selected for observations. Results show that, the concentration of SS is quite different across the catchment. The average concentration of SS in the upstream of the catchment with forest as the dominant land use, is 6.92mg/L, while the concentration in the downstream with a certain percentage of arable land is 14.39mg/L. The SS concentration shows an increasing trend from the upstream to the downstream, in correlation with the change of land uses. Also there exists a considerable deviation of the SS concentration in different seasons. The concentration in summer is relatively high, while lower in other seasons, with a likely relationship to rainfall events.

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