Fingerprinting sub-basin spatial sediment sources in a large Iranian catchment under dry-land cultivation and rangeland farming: combining geochemical tracers and weathering indices

A - Papers appearing in refereed journals

Raigani, Z. M., Nosrati, K. and Collins, A. L. 2019. Fingerprinting sub-basin spatial sediment sources in a large Iranian catchment under dry-land cultivation and rangeland farming: combining geochemical tracers and weathering indices. Journal of Hydrology: Regional Studies. 24, p. 100613.

AuthorsRaigani, Z. M., Nosrati, K. and Collins, A. L.
Abstract

Study region: The Kamish River catchment (308 km2); a mountainous agricultural catchment under dry-land and rangeland farming located in Kermanshah province, in western Iran.
Study focus: The main objective of this study was to apportion sub-basin spatial source relative contributions to target channel bed sediment samples using a composite fingerprinting procedure including a Bayesian un-mixing model. In total, thirty-four geochemical tracers, eleven elemental ratios and different weathering indices were measured or estimated for 43 tributary sediment samples collected to characterise three sub-basin spatial sediment sources and eleven target bed sediment samples collected at the outlet of the main basin. Statistical analysis was used to select three different composite signatures.
New hydrological insights for the region: Using a composite signature based on KW-H and DFA, the respective relative contributions (with uncertainty ranges) from tributary sub-basins 1, 2 and 3 were estimated as 54.3% (47.8–62.0), 11.4% (4.2–18.7) and 34.3% (27.6–39.9), compared to 72.0% (61.6–82.7), 13.6% (9.0–18.5) and 14.2% (3.1–25.4) using a combination of KW-H and data mining, and 50.8% (42.8–59.9), 28.7% (20.2–37.3) and 20.3% (12.7–27.2) using a fingerprint
selected by KW-H and PCCA. The root mean square difference between these source estimates highlighted sensitivity to the composite signatures. Evaluation of the un-mixing model
predictions using virtual mixture tests confirmed agreement between modelled and known source proportions.

KeywordsSediment provenance; Composite fingerprinting; Weatherting indices; Dry-land farming; Un-mixing model
Year of Publication2019
JournalJournal of Hydrology: Regional Studies
Journal citation24, p. 100613
Digital Object Identifier (DOI)doi:10.1016/j.ejrh.2019.100613
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 3 (WP3) - Sustainable intensification - optimisation at multiple scales
Publisher's version
Output statusPublished
Publication dates
Online01 Jul 2019
Publication process dates
Accepted27 Jun 2019
PublisherElsevier
ISSN2214-5818

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