Wildfire Effects on Suspended Sediment Delivery Quantified Using Fallout Radionuclide Tracers in a Mediterranean Catchment

2015 ◽  
Vol 27 (5) ◽  
pp. 1501-1512 ◽  
Author(s):  
Joan Estrany ◽  
José A. López‐Tarazón ◽  
Hugh G. Smith
Keyword(s):  
Suspended Sediment ◽  
Sediment Delivery ◽  
Radionuclide Tracers ◽  
Wildfire Effects ◽  
Fallout Radionuclide

scholarly journals Suspended sediment dynamics in a Southeast Asian mountainous catchment: Combining river monitoring and fallout radionuclide tracers

2014 ◽  
Vol 519 ◽  
pp. 1811-1823 ◽  
Author(s):  
Elian Gourdin ◽  
Olivier Evrard ◽  
Sylvain Huon ◽  
Irène Lefèvre ◽  
Olivier Ribolzi ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Southeast Asian ◽  
Sediment Dynamics ◽  
River Monitoring ◽  
Mountainous Catchment ◽  
Radionuclide Tracers ◽  
Fallout Radionuclide

Deriving hillslope sediment budgets in wildfire-affected forests using fallout radionuclide tracers

Geomorphology ◽  
2009 ◽  
Vol 104 (3-4) ◽  
pp. 105-116 ◽  
Author(s):  
W.H. Blake ◽  
P.J. Wallbrink ◽  
S.N. Wilkinson ◽  
G.S. Humphreys ◽  
S.H. Doerr ◽  
...  
Keyword(s):  
Sediment Budgets ◽  
Radionuclide Tracers ◽  
Fallout Radionuclide

Hydrometeorological assessments and suspended sediment delivery from a central Himalayan glacier in the upper Ganga basin

2018 ◽  
Vol 33 (4) ◽  
pp. 493-509 ◽  
Author(s):  
Amit Kumar ◽  
Akshaya Verma ◽  
Anupam Anand Gokhale ◽  
Rakesh Bhambri ◽  
Anshuman Misra ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Sediment Delivery ◽  
Ganga Basin ◽  
Himalayan Glacier

Revised sediment transport model for estimation of suspended sediment flux and chemical composition of the Irrawaddy and Salween rivers

2020 ◽  
Author(s):  
J. Jotautas Baronas ◽  
Edward T. Tipper ◽  
Michael J. Bickle ◽  
Robert G. Hilton ◽  
Emily I. Stevenson ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Organic Carbon ◽  
Suspended Sediment ◽  
Transport Model ◽  
Sediment Concentration ◽  
Sediment Flux ◽  
Sediment Discharge ◽  
Anthropogenic Pressures ◽  
Modeling Framework ◽  
Sediment Delivery

<p>A large portion of freshwater and sediment is exported to the ocean by just several of the world's major rivers. Many of these mega-rivers are under significant anthropogenic pressures, such as damming and sand mining, which are having a significant impact on water and sediment delivery to deltaic ecosystems. However, accurately measuring the total sediment flux and its mean physicochemical composition is difficult in large rivers due to hydrodynamic sorting of sediments. To account for this, we developed an updated semi-empirical Rouse modeling framework, which synoptically predicts sediment concentration, grain size distribution, and mean chemical composition (organic carbon wt%, Al/Si ratio) with depth and across the river channel.</p><p>We applied this model to derive new sediment flux estimates for the Irrawaddy and the Salween, the last two free-flowing mega-rivers in Southeast Asia, using a newly collected set of suspended sediment depth samples, coupled to ADCP-measured flow velocity data. Constructing sediment-discharge rating curves, we calculated an annual sediment flux of 326 (68% confidence interval of 256-417) Mt/yr for the Irrawaddy and 159 (109-237) Mt/yr for the Salween, together accounting for 2-3% of total global riverine sediment discharge. The mean flux-weighted sediment exported by the Irrawaddy is significantly coarser (D<sub>84</sub> = 193 ± 13 µm) and OC-poorer (0.29 ± 0.08 wt%) compared to the Salween (112 ± 27 µm and 0.59 ± 0.16 wt%, respectively). Both rivers export similar amounts of particulate organic carbon, with a total of 1.9 (1.0-3.3) Mt C/yr, contributing ~1% of the total riverine POC export to the ocean. These results underline the global significance of the Irrawaddy and Salween rivers and warrant continued monitoring of their sediment fluxes, given the increasing anthropogenic pressures on these river basins.</p>

scholarly journals Effect of soil properties on peat erosion and suspended sediment delivery in drained peatlands

2014 ◽  
Vol 50 (4) ◽  
pp. 3523-3535 ◽  
Author(s):  
Tapio Tuukkanen ◽  
Hannu Marttila ◽  
Bjørn Kløve
Keyword(s):  
Soil Properties ◽  
Suspended Sediment ◽  
Sediment Delivery

scholarly journals Interactions between aquatic vegetation, hydraulics and fine sediment

2020 ◽  
Author(s):  
Hamish Biggs ◽  
Arman Haddadchi ◽  
Murray Hicks
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Hydraulic Resistance ◽  
Vegetation Cover ◽  
Aquatic Vegetation ◽  
Fine Sediment ◽  
Suspended Sediment Transport ◽  
Sediment Delivery ◽  
Lowland Streams ◽  
Mechanical Removal

Aquatic vegetation, hydraulics and sediment transport have complex interactions that are not yet well understood. These interactions are important for sediment conveyance, sediment sequestration, phasing of sediment delivery from runoff events, and management of ecosystem health in lowland streams. To address this knowledge gap detailed field measurements of sediment transport through natural flexible aquatic vegetation are required to supplement and validate laboratory results. This paper contributes a field study of suspended sediment transport through aquatic vegetation and includes mechanical removal of aquatic vegetation with a weed cutting boat. It also provides methods to quantify vegetation cover through remote sensing with Unmanned Aerial Vehicles (UAVs) and estimate biomass from ground truth sampling. Suspended sediment concentrations were highly dependent on aquatic vegetation abundance, and the distance upstream that had been cleared of aquatic vegetation. When the study reach was fully vegetated (i.e. cover >80%), the maximum recorded SSC was 14.6 g/m (during a fresh with discharge of 2.47 m/s), during weed cutting operations SSC was 76.8 g/m at 0.84 m/s (weedcutting boat 0.5-1 km upstream from study reach), however following weed cutting operations (4.6 km cleared upstream), SSC was 139.0 g/m at a discharge of 1.52 m/s. The data indicates that fine sediment was being sequestered by aquatic vegetation and likely remobilised after vegetation removal. Investigation of suspended sediment spatial dynamics illustrated changes in particle size distribution due to preferential settling of coarse particles within aquatic vegetation. Hydraulic resistance in the study reach (parameterized by Manning’s n) dropped by over 70% following vegetation cutting. Prior to cutting hydraulic resistance was discharge dependent, while post cutting hydraulic resistance was approximately invariant of discharge. Aerial surveying captured interesting changes in aquatic vegetation cover, where some very dense regions of aquatic vegetation were naturally removed leaving behind unvegetated riverbed and fine sediment.

Sign in / Sign up

Export Citation Format

Share Document