Fine sediment sources, sedimentation risk and siltation of salmonid spawning gravels in the Herefordshire Lugg, UK

2012 ◽  
Author(s):  
J. Stopps ◽  
L.J. McEwen ◽  
D.J. Milan
Keyword(s):  
Fine Sediment ◽  
Sediment Sources

Tracing fine sediment sources in small mountain catchment

2011 ◽  
Vol 63 (10) ◽  
pp. 2324-2330 ◽  
Author(s):  
A. Kouhpeima ◽  
S. Feiznia ◽  
H. Ahmadi
Keyword(s):  
Magnetic Susceptibility ◽  
Organic Contaminants ◽  
Function Analysis ◽  
Management Strategies ◽  
Fine Sediment ◽  
Mitigation Strategies ◽  
Catchment Management ◽  
Sediment Sources ◽  
Diffuse Source ◽  
And Control

Fine sediment represents an important diffuse source pollutant in surface waters, due to its role in governing the transfer and fate of many substances, including nutrients, heavy metals, pesticides and other organic contaminants, and its influence on aquatic ecology. Therefore, catchment management strategies frequently need to include provision for the control of sediment mobilization and delivery. The sediment tracing concept provides a valuable framework for assisting the management and control of diffuse source sediment pollution by identifying the key sources and demonstrating the importance of intermediate storages and the likely impact of upstream mitigation strategies on downstream sediment and sediment associated contaminant fluxes. In this research, fine sediment sources were identified using tracing method. By field works, sediments were sampled from dam reservoir, different sources were also sampled. Fifteen tracers were first selected for tracing which are: The amounts of N, P, C, Cr, Co, Mg, K, Na, smectite, chlorite, illite, kaolinite, and two magnetic properties consisting of Low Frequency Magnetic Susceptibility (XLF) and Frequency Dependent Magnetic Susceptibility (XFD). The samples were analyzed in the laboratory for these parameters and different statistical methods were applied to the data including Non-parametric Kruskal–Wallis Test and Stepwise Discriminant function analysis. The results provide important information on the relative importance of fine sediment sources to the reservoir sediments, which can be used to support model validation and the targeting of management and control strategies.

The use of fine sediment fractal dimensions and colour to determine sediment sources in a small watershed

CATENA ◽  
2003 ◽  
Vol 53 (2) ◽  
pp. 165-179 ◽  
Author(s):  
Andreas Krein ◽  
Ellen Petticrew ◽  
Thomas Udelhoven
Keyword(s):  
Fractal Dimensions ◽  
Fine Sediment ◽  
Small Watershed ◽  
Sediment Sources

scholarly journals Fine sediment sources in Conservation Effects Assessment Project watersheds

2014 ◽  
Vol 69 (5) ◽  
pp. 402-413 ◽  
Author(s):  
C. G. Wilson ◽  
R. A. Kuhnle ◽  
S. M. Dabney ◽  
R. N. Lerch ◽  
C. H. Huang ◽  
...  
Keyword(s):  
Fine Sediment ◽  
Sediment Sources ◽  
Effects Assessment

scholarly journals The difference of sediment sources between high flows and low flows in the Hailuogou Glacier stream

2020 ◽  
Author(s):  
Jiacun Chen ◽  
Ivan Lizaga ◽  
Xinbao Zhang ◽  
Ana Navas
Keyword(s):  
Suspended Sediment Concentration ◽  
Sediment Load ◽  
Sediment Concentration ◽  
Fine Sediment ◽  
High Flow ◽  
Sediment Sources ◽  
Low Flows ◽  
Sediment Loads ◽  
High Flows ◽  
Sediment Mixtures

<p>       In the area of Mt Gongga (Hengduan range, China) most glaciers are experiencing considerable retreat and mass loss since the early 20th century. Drainage of recently deglaciated surfaces delivers fine sediments thus affecting patterns of sediment delivery with impacts on water quality. Research in the area indicates significant differences between sediment at high flows and low flows in the same river during different seasons. High level flows were usually caused by heavy rainfall events or continuous rainfall that erode the slopes by sheet, rill and gully erosion and transport important amounts of sediments to streams leading to significant increases in river sediment flux. During low flows subsurface soil flux during spring and the direct discharge at the outlet of the glacier result in much less sediment load and mean suspended sediment concentration compared with high flows. The runoff volume, hydrograph peak, sediment load and mean suspended sediment concentration in high flows are as much as an order of magnitude higher than in low flows. Therefore, it is of great significance exploring the provenance of fine sediment during high flows and low flows to assess if there are differences in the contributing sources of sediments.</p><p>          For this purpose during a 2 weeks field campaign in May 2016 in the frame of IAEA INT5153 project, source sediment samples and channel bed sediment mixtures were collected along the river valley of the Hailuogou Glacier. Three main sources were identified: surface glacier materials, old moraines and recent moraines. Composite surface samples (2 cm) were created of 10 subsamples in each representative site for surface glacier materials. Following the same scheme on old lateral moraines 10 sites were selected from the more mineral blocky deposits to the most vegetated parts at higher altitudes. On recent moraines 12 sites with different stages of vegetation cover were sampled. Starting from the glacier tongue a total of 7 fine sediment mixtures were collected along the river of which 3 composite samples corresponded to the dry season with low flow and 4 samples corresponded to high flow.  A new consensus test method and an unmixing model were used to estimate the apportionments of the sediment sources to the sediment loads. The results showed that the contribution of different sources to the sediment mixture deposits varied along the river showing different provenance for the low and high flow suggesting different mechanisms of sediment generation during melting and dry seasons. This study is of interest for gaining knowledge on changing dynamics of sediment in regions were the rapid disappearance of glaciers and snow as in Mt. Gongga, has increased the mobilization and transport of sediment loads with consequences for the local population.</p>

scholarly journals Quantifying the temporal variation of the contribution of fine sediment sources to sediment yields from Chilean forested catchments during harvesting operations

2021 ◽  
Vol 42 (2) ◽  
pp. 231-244
Author(s):  
Paulina Schuller ◽  
Desmond E Walling ◽  
Andrés Iroumé ◽  
César Quilodrán ◽  
Alejandra Castillo
Keyword(s):  
Temporal Variation ◽  
Fine Sediment ◽  
Sediment Sources ◽  
Forested Catchments ◽  
Sediment Yields

scholarly journals Using239Pu as a tracer for fine sediment sources in the Daly River, Northern Australia

2015 ◽  
Vol 91 ◽  
pp. 00006 ◽  
Author(s):  
R. Lal ◽  
L. K. Fifield ◽  
S.G. Tims ◽  
R.J. Wasson ◽  
D. Howe
Keyword(s):  
Fine Sediment ◽  
Northern Australia ◽  
Sediment Sources
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