Fine sediment and nutrient dynamics related to particle size and floc formation in a Burdekin River flood plume, Australia

被引:165
作者
Bainbridge, Zoe T. [1 ,2 ,3 ]
Wolanski, Eric [2 ,4 ]
Alvarez-Romero, Jorge G. [2 ,5 ]
Lewis, Stephen E. [2 ]
Brodie, Jon E. [2 ]
机构
[1] James Cook Univ, Sch Earth & Environm Sci, Townsville, Qld 4811, Australia
[2] James Cook Univ, Catchment Reef Res Grp, Australian Ctr Trop Freshwater Res, Townsville, Qld 4811, Australia
[3] CSIRO Land & Water, ATSIP, Townsville, Qld 4811, Australia
[4] Australian Inst Marine Sci, Townsville, Qld 4810, Australia
[5] James Cook Univ, Australian Res Council Ctr Excellence Coral Reef, Townsville, Qld 4811, Australia
关键词
Great Barrier Reef; Muddy marine snow; Grain size; Catchment runoff; Sediment export; Nitrogen; Flocculation; GREAT-BARRIER-REEF; TRANSPARENT EXOPOLYMER PARTICLES; SUSPENDED SEDIMENT; MISSISSIPPI RIVER; PARTICULATE MATERIALS; INNER-SHELF; CORAL COVER; DISCHARGE; NITROGEN; LAGOON;
D O I
10.1016/j.marpolbul.2012.01.043
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The extreme 2010-2011 wet season resulted in highly elevated Burdekin River discharge into the Great Barrier Reef lagoon for a period of 200 days, resulting in a large flood plume extending >50 km offshore and >100 km north during peak conditions. Export of suspended sediment was dominated by clay and fine silt fractions and most sediment initially settled within 10 km of the river mouth. Biologically-mediated flocculation of these particles enhanced deposition in the initial low salinity zone. Fine silt and clay particles and nutrients remaining in suspension, were carried as far as 100 km northward from the mouth, binding with planktonic and transparent exopolymer particulate matter to form large floc aggregates (muddy marine snow). These aggregates, due to their sticky nature, likely pose a risk to benthic organisms e.g. coral and seagrass through smothering, and also by contributing to increased turbidity during wind-induced resuspension events. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:236 / 248
页数:13
相关论文
共 71 条
  • [1] Deposition, mineralization, and storage of carbon and nitrogen in sediments of the far northern and northern Great Barrier Reef shelf
    Alongi, Daniel M.
    Trott, Lindsay A.
    Pfitzner, John
    [J]. CONTINENTAL SHELF RESEARCH, 2007, 27 (20) : 2595 - 2622
  • [2] The cycling and fate of terrestrially-derived sediments and nutrients in the coastal zone of the Great Barrier Reef shelf
    Alongi, DM
    McKinnon, AD
    [J]. MARINE POLLUTION BULLETIN, 2005, 51 (1-4) : 239 - 252
  • [3] Supply limited sediment transport in a high-discharge event of the tropical Burdekin River, North Queensland, Australia
    Amos, KJ
    Alexander, J
    Horn, A
    Pocock, GD
    Fielding, CR
    [J]. SEDIMENTOLOGY, 2004, 51 (01) : 145 - 162
  • [4] Revisiting coral reef connectivity
    Andréfouët, S
    Mumby, PJ
    McField, M
    Hu, C
    Muller-Karger, FE
    [J]. CORAL REEFS, 2002, 21 (01) : 43 - 48
  • [5] [Anonymous], 2012, Stand. Methods, V741, DOI [DOI 10.2105/SMWW.2882, DOI 10.2105/AJPH.51.6.940-A, 10.2105/AJPH.51.6.940-a]
  • [6] [Anonymous], FLOW DISCH DAT PROV
  • [7] [Anonymous], SEAGRASS WATCH NEWS
  • [8] [Anonymous], 2007, MAST 2000 US MAN
  • [9] Importance of biologically mediated removal of fine sediments from the Fly River Plume, Papua New Guinea
    Ayukai, T
    Wolanski, E
    [J]. ESTUARINE COASTAL AND SHELF SCIENCE, 1997, 44 (05) : 629 - 639
  • [10] Bell I., 2011, SEAGRASS WATCH N NOV, P32