Evaluating sampling efficiency when estimating sediment source contributions to suspended sediment in rivers by fingerprinting

2016 ◽  
Vol 30 (19) ◽  
pp. 3408-3419 ◽  
Author(s):  
Robin T. Clarke ◽  
Jean P. G. Minella
Keyword(s):  
Suspended Sediment ◽  
Sampling Efficiency ◽  
Sediment Source ◽  
Source Contributions

Improving spatial representation of erosion sources using Sediment Fingerprinting with terrain data and sediment budget modelling

2020 ◽  
Author(s):  
Simon Vale ◽  
Hugh Smith
Keyword(s):  
Suspended Sediment ◽  
Source Apportionment ◽  
End Users ◽  
Sediment Budget ◽  
Storm Event ◽  
Sediment Source ◽  
Sediment Fingerprinting ◽  
Sediment Sources ◽  
Geochemical Tracers ◽  
Source Contributions

<p>Sediment fingerprinting quantifies proportional contributions of catchment sediment sources to downstream sediment mixtures and deposits. While the sediment fingerprinting technique is well established it is still challenged by the coarse spatial resolution of sediment source discrimination which hinders understanding of catchment sediment dynamics and limits its usefulness for land management where finer resolution spatial information is required.</p><p>Here, two conventional sediment fingerprinting datasets from New Zealand are used to show how spatial modelling of source loads can improve 1) the usefulness of sediment fingerprinting approaches and 2) visualization of results for end-users by combining source apportionment with terrain information and sediment budget modelling. The two case studies involve unmixing sediment source contributions to 1) overbank deposits within the Oroua River catchment, where six sediment sources (Mountain Range, Mudstone, Hill Subsurface, Hill Surface, Unconsolidated Sandstone, and Channel Bank) across two size fractions (<63 µm and 125–300 µm) were characterized using bulk geochemical and radionuclide tracers and 2) suspended sediment in the Manawatu catchment, where a similar six sources were characterized using bulk geochemical tracers to determine changes in source contributions to hourly suspended sediment samples during a 53hr storm event.</p><p>The proportional source contributions for each case study are applied to modelled sediment loads and spatially distributed using terrain information for rock type, slope and channel network extent to produce specific sediment yield maps for both catchments and spatial visualization of sediment generation during the Manawatu catchment storm event. Integrating sediment fingerprinting results with spatial datasets and modelling can enhance interpretation of source apportionment results and improve the utility of this information for end-users focused on the spatial targeting of erosion sources for mitigation to reduce downstream sediment impacts.   </p>

scholarly journals Suspended sediment source and propagation during monsoon events across nested sub-catchments with contrasted land uses in Laos

2017 ◽  
Vol 9 ◽  
pp. 69-84 ◽  
Author(s):  
Sylvain Huon ◽  
Olivier Evrard ◽  
Elian Gourdin ◽  
Irène Lefèvre ◽  
Thierry Bariac ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Sediment Source ◽  
Land Uses

A new method for fingerprinting sediment source contributions using distances from discriminant function analysis

CATENA ◽  
2016 ◽  
Vol 147 ◽  
pp. 32-39 ◽  
Author(s):  
Bing Liu ◽  
Daniel E. Storm ◽  
Xunchang J. Zhang ◽  
Wenhong Cao ◽  
Xingwu Duan
Keyword(s):  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
New Method ◽  
Sediment Source ◽  
Source Contributions

Study on the Tidal Current and Suspended Sediment Transport in Taizhou Bay

2012 ◽  
Vol 212-213 ◽  
pp. 55-58
Author(s):  
Jie He ◽  
Xin Sheng Zhao ◽  
Yu Fan Zhu
Keyword(s):  
Sediment Transport ◽  
Numerical Model ◽  
Suspended Sediment ◽  
Tidal Current ◽  
Sediment Concentration ◽  
Suspended Sediment Transport ◽  
Sediment Source ◽  
Sea Floor ◽  
Hydrologic Data ◽  
The Way

Taizhou Bay is an estuary with high tidel range, middle tidal current and low sediment concentration. For the sea floor is very dense, it is stable in the usual water regimen. The numerical model is introduced to simulate the suspended sediment transport in Taizhou Bay. And the recent hydrologic data and the seabed change have been validated by the numerical model. The movement of tidal current and sediment in Dagagn Bay are simulated, and the sediment siltation in port designed is calculated by the model. The results show that the sediment source is from the shoal produced by the ebb current, and the sediment silting is decreased two-thirds by the cofferdam back of the bay, because the way of the suspended sediment is stopped by the cofferdam from the shoal to the harbor.

Isotope mixing models require individual isotopic tracer content for correct quantification of sediment source contributions

2018 ◽  
Vol 32 (7) ◽  
pp. 981-989 ◽  
Author(s):  
Hari Ram Upadhayay ◽  
Samuel Bodé ◽  
Marco Griepentrog ◽  
Roshan Man Bajracharya ◽  
William Blake ◽  
...  
Keyword(s):  
Mixing Models ◽  
Sediment Source ◽  
Isotopic Tracer ◽  
Source Contributions ◽  
Isotope Mixing Models

Quantifying sediment source contributions in an agricultural catchment with ephemeral and classic gullies using 137Cs technique

Geoderma ◽  
2021 ◽  
Vol 398 ◽  
pp. 115112
Author(s):  
Hong Chen ◽  
Gang Liu ◽  
Xunchang Zhang ◽  
Hongqiang Shi ◽  
Hairu Li
Keyword(s):  
Sediment Source ◽  
Source Contributions ◽  
137Cs Technique

scholarly journals Combining colour parameters and geochemical tracers to improve sediment source discrimination in a mining catchment (New Caledonia, South Pacific Islands)

2020 ◽  
Author(s):  
Virginie Sellier ◽  
Oldrich Navratil ◽  
John Patrick Laceby ◽  
Cédric Legout ◽  
Michel Allenbach ◽  
...  
Keyword(s):  
New Caledonia ◽  
Sediment Source ◽  
Sediment Tracing ◽  
Geochemical Properties ◽  
Source Contributions ◽  
The World ◽  
Nickel Mining ◽  
Colour Parameters ◽  
Geochemical Approach ◽  
Variance Explained

Abstract. Over the last century, human activities have induced significant land-cover changes that have accelerated soil erosion processes around the world. In New Caledonia, a French island located in the south-west Pacific Ocean, open-cast nickel mining has raised many concerns regarding its impact on riverine systems (i.e. hyper-sedimentation, overburden) and the island's ecosystems (i.e. flooding, lagoon siltation, water pollution). A sediment tracing study has been conducted to quantify the contribution of mining versus non-mining sub-catchments in one of the first areas exploited for nickel mining, the Thio River catchment (397 km2). Sediment deposited during two cyclonic events (i.e. 2015 and 2017) was collected following a tributary design approach. Source (n = 24) and river sediment (n = 19) samples were analyzed by X-ray fluorescence and spectroscopy in the visible spectra (i.e. 365–735 nm). Four fingerprinting approaches based on (1) colour parameters, (2) geochemical properties, (3) colour parameters coupled with geochemical properties and (4) the entire visible spectrum were tested to estimate sediment source contributions. The results demonstrated that the individual sediment tracing methods based on spectroscopy measurements (i.e. (1) and (4)) did not provide sufficient discrimination between sources. However, the inclusion of colour properties in addition to geochemical parameters (3) provided the highest discrimination between sources (i.e. 92.6 % of source variance explained). Although with a slightly lower discrimination potential (i.e. 83.1 % of variance explained in sources), the geochemical approach (2) provided similar results to those obtained with the colour coupled with geochemical approach (3). In addition, mixed linear models associated with these two approaches have been experimentally validated with artificial mixture samples. The results obtained with model (3) showed that mining source contributions strongly dominated the sediments inputs with a mean contribution of 68 % (SD 25 %) for the 2015 flood event and 88 % (SD 8 %) for the 2017 flood event. These results suggest that catchment management should focus on the contributions of mining tributaries to reduce sediment inputs in the river systems. Therefore, the use of these approaches based on geochemical properties individually (2) and coupled to colour parameters (3) could be extended to other mining catchments of New Caledonia but also to other similar nickel mining catchments around the world (e.g. Australia, Brazil, Dominican Republic, Cuba) to estimate sediment source apportionment.

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