Pre-development denudation rates for the Great Barrier Reef catchments derived using 10Be

MARINE POLLUTION BULLETIN

卷:172

Article

Mariotti, Apolline^1,2  Croke, Jacky³  Bartley, Rebecca⁴  Kelley, Samuel E.¹  Ward, Jay⁵  Fulop, Reka-Hajnalka^6,7  Rood, Anna H.^8,9,10  Rood, Dylan H.^5,9,10  Codilean, Alexandru T.^7,11  Wilcken, Klaus⁶  Fifield, Keith¹² 

[1] Univ Coll Dublin, Sch Earth Sci, Dublin 4, Ireland

[2] Univ Coll Dublin, iCRAG Irish Ctr Res Appl Geosci, Dublin, Ireland

[3] Univ Coll Dublin, Sch Geog, Dublin 4, Ireland

[4] CSIRO Land & Water, GPO Box 2583, Brisbane, Qld 4001, Australia

[5] Imperial Coll London, Dept Earth Sci & Engn, London SW7 2AZ, England

[6] Australias Nucl Sci & Technol Org ANSTO, Lucas Heights, NSW 2234, Australia

[7] Univ Wollongong, Sch Earth Atmospher & Life Sci, Wollongong, NSW 2522, Australia

[8] Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England

[9] Univ Ottawa, Dept Earth & Environm Sci, Ottawa, ON K1N 6N5, Canada

[10] Univ Ottawa, AE Lalonde AMS Lab, Ottawa, ON K1N 6N5, Canada

[11] Univ Wollongong, ARC Ctr Excellence Australian Biodivers & Heritag, Wollongong, NSW 2522, Australia

[12] Australian Natl Univ, Res Sch Phys, Canberra, ACT 2601, Australia

关键词: Great barrier reef;    Sediment yield;    Reef plan;    Cosmogenic nuclides;    Denudation;    Be-10;   

DOI  :  10.1016/j.marpolbul.2021.112731

来源: Elsevier

【 摘 要 】

Understanding of the pre-development, baseline denudation rates that deliver sediment to the Great Barrier Reef (GBR) has been elusive. Cosmogenic 10Be in sediment is a useful integrator of denudation rates and sediment yields averaged over large spatial and temporal scales. This study presents 10Be data from 71 sites across 11 catchments draining to the GBR: representing 80% of the GBR catchment area and provide background sediment yields for the region. Modern, short-term, sediment yields derived from suspended load concentrations are compared to the 10Be data to calculate an Accelerated Erosion Factor (AEF) that highlights denudation hotspots where sediment yields have increased over the long-term background values. The AEF results show that 58% basins have higher modern sediment yields than long-term yields. The AEF is considered a useful approach to help prioritise on-ground investments in remediation and the additional measured empirical data in this paper will help support future predictive models.

【 授权许可】

Free