novel approaches of nuclear techniques in
TRANSCRIPT
S o i l E r o s i o n M o d e l l i n g w o r k s h o p E C | J R C Joint Research Centre
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Novel approaches of nuclear techniques in soil erosion: Resampl ing for identi fy ing recent
changes and test ing f ingerpr int ing methods
Block D: Sediment Transport - Radionuclides
21 March 2017 | 16:10-16:20
Leticia Gaspar MNCN – CSIC | Spain
APPROACH 1 | 210Pbex in Mediterranean environments
Behaviour of 210Pbex
Soil Properties
Vegetation Cover | Forest - Scrub
Soil Redistribution rates ! Uncultivated - Cultivated
0 cm
14 cm
0 cm
14 cm
Layer 2 to 4 cm
Gaspar et. al., European Journal of Soil Science ,
DOI: 10.1111/ejss.12427 (2017)
210Pbex distribution under different Vegetation Cover | Forest – Scrub | Spanish Pre-Pyrenees
• High resolution sampling (2 cm)
• 210Pbex in the uppermost 14 cm - Uncultivated soil
• Vegetation Cover affects the surface activity of 210Pbex
• 210Pbex in Forest > in scrub (0-2 cm)
• Distribution of 210Pbex matches with SOC | Stones (0-6 cm)
Gaspar et. al., European Journal of Soil Science , DOI: 10.1111/ejss.12427 (2017)
APPROACH 1 | 210Pbex in Mediterranean environments
Gaspar et. al., Soil & Tillage Research, 130, 81-90 (2013)
APPROACH 1 | 210Pbex in Mediterranean environments
Soil Redistribution Rates using 210Pbex | Perceptual Model
UN-FAO | IAEA-CRP | Project D15017-RA-20532 |. Gaspar, Navas (2016-2021)
APPROACH 2 | 137Cs Re-Sampling for identifying recent changes
Rates of soil erosion and deposition using 137Cs
Re-Sampling using 137Cs
Time Frame 13 years | 2003 - 2016
Estaña catchment | SPAIN
Endorheic Catchment
Central Lake TRANSECT approach
CORING approach
137Cs Re-Sampling
• TRANSECT approach Re-sampling 23 soil sectioned profiles along the transect
• CORING approach Re-sampling short cores - 60 cm
Reference Inventory 1980 Bq m-2 (2003)
Gaspar et al, Results are in progress
APPROACH 3 | Testing Fingerprinting methods
Fingerprinting technique
Test Mixing model with Lab experiment
Influence of Particle Size Factor
Where the sediments come from ? Lab Experiment | Create experimental mix
• Combine different quantified proportions of sources
• Geochemistry as fingerprinting properties ED-XRF
• Run the Mixing model knowing the result – Output sensitivity
Soil 2 = 30% Experimental Sources
Soil 5 = 10%
Soil 4 = 30%
Soil 1 = 30%
Experimental Sediment
Leticia Gaspar
CSIC - MNCN | Spain
[email protected] [email protected]
Thank you for your attention
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