Sources of sediment to the Great Barrier Reef World Heritage Area

McKergow, Lucy A.; Prosser, Ian P.; Hughes, Andrew O.; Brodie, Jon

doi:10.1016/j.marpolbul.2004.11.029

Cited by 148 publications

(118 citation statements)

References 15 publications

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“…H = RKLSCP (1) Esta fórmula ha sido ampliamente aplicada en la predicción de la erosión y planes de conservación en diferentes partes del mundo (Mitasova y Mitas, 1999;Onori et al, 2006;Montes-León et al, 2011) y la comparación con otros métodos ha sido discutida en varios trabajos (e.g. Phillips, 1991;Wasson et al, 1996;Faran Ali y De Boer, 2003;McKergow et al, 2005). En el área de estudio no existen prácticas de conservación del suelo por lo que el factor P, es considerado con valor 1, de acuerdo a lo señalado por Simms et al, (2003).…”

Section: Erosiónunclassified

Tasas de erosión e índices geomorfológicos en tres cuencas costeras al sur de la península de Baja California, México

Lozano¹,

Sánchez²,

Diéguez³

et al. 2012

BSGM

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Tasas de erosión e índices geomorfológicos 229 ResumenLas cuencas de drenaje costeras del sur de la península de Baja California forman parte importante en la estabilidad del sistema de celdas litorales de su costa, como fuentes principales de sedimentos. Las cuencas Migriño, El Salto y El Tule son vulnerables a la erosión debido a las pendientes empinadas del terreno y a su ubicación, ya que en esta parte de la península tienen mayor influencia las precipitaciones intensas asociadas a los huracanes que se presentan en verano. Con el uso de la fórmula RUSLE (Revised Universal Soil Loss Equation) y los índices geomorfológicos obtenidos mediante la aplicación de técnicas de SIG, se evaluó la distribución espacial de las tasas de erosión hídrica y su relación con las unidades litológicas, rasgos geomorfológicos, distribución de suelos y patrones estructurales. Esto permitió conocer el control que ejercen la distribución del suelo y los rasgos geomorfológicos sobre la distribución de tasas de erosión dentro de cada una de las cuencas de drenaje. Las tasas de erosión de moderadas (0.1 a 0.5 Mg ha -1 año -1 ) a altas (0.5 a 2 Mg ha -1 año -1 ) se asocian a pendientes iguales o mayores a 15º, (principalmente laderas de montañas) y a suelos tipo litosol-regosol; tasas de erosión bajas (0 -0.1 Mg ha -1 año -1 ) se asocian a pendientes menores a 5º (lomeríos y planicies), con suelos tipo regosol. El análisis de los índices geomorfológicos muestra que las cuencas de drenaje son jóvenes, asociadas a actividad neotectónica moderada a baja, evidenciada principalmente por el control estructural en la parte alta de las cuencas. En la parte media y baja de las cuencas los cambios en los índices geomorfológicos indican control estructural bajo, en donde se presentan procesos erosivos y de sedimentación. Tasas de erosión e índices geomorfológicos en tres cuencas costeras al sur de la península de Baja California, México

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Section: Erosiónunclassified

Tasas de erosión e índices geomorfológicos en tres cuencas costeras al sur de la península de Baja California, México

Lozano¹,

Sánchez²,

Diéguez³

et al. 2012

BSGM

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show abstract

“…The SedNet model (e.g. McKergow et al 2005a) estimates sediment loads in catchments by constructing material budgets that account for the main sources and stores of sediment. The model makes estimates of erosion rates (gully, bank and hillslope) for available climate, soil, topography and land-use data as well as information relating to the catchment's hydrological processes (mean annual flow, extent of floodplain, channel dimensions).…”

Section: Model Components Of Target Settingmentioning

confidence: 99%

“…Chl-a concentrations in the waters off Cape York average 0.2 µg L −1 , whereas in the area of coral reef biodiversity loss (wet tropics coast) concentrations average 0.7 µg L −1 . The difference is ascribed to the increased nutrient discharge from rivers such as the Tully caused by increased erosion and fertiliser loss (Mitchell et al 2001(Mitchell et al , 2009Furnas 2003;McKergow et al 2005a;Brodie et al 2007). Water quality trigger values for the GBRWHA have been set for chl-a at 0.6 µg L −1 for inshore waters (Moss et al 2005) and later to 0.5 µg L −1 (GBRMPA 2008; since then reduced to 0.45 µg L −1 ), and this value (0.5 µg L −1 ) was used as the GBR target for the Tully WQIP.…”

Section: Target Setting For the Tully-murray Basin For Nitratementioning

confidence: 99%

“…On its western boundary, 35 basins discharge into the GBRWHA over ∼2000 km of Queensland coastline. Loads of pollutants discharging from these basins have increased greatly with the development of the river catchments for agriculture over the past 150 years (Furnas 2003;McKergow et al 2005aMcKergow et al , 2005b. Pollutant loads have increased by up to five times for suspended sediment from some rivers (McKergow et al 2005a), and up to six times for nitrate in others (Hunter and Walton 2008;Mitchell et al 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Loads of pollutants discharging from these basins have increased greatly with the development of the river catchments for agriculture over the past 150 years (Furnas 2003;McKergow et al 2005aMcKergow et al , 2005b. Pollutant loads have increased by up to five times for suspended sediment from some rivers (McKergow et al 2005a), and up to six times for nitrate in others (Hunter and Walton 2008;Mitchell et al 2009). Moreover, considerable quantities of pesticides are now discharged that would have been completely absent before the 1950s (Johnson and Ebert 2000;Mitchell et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Target setting for pollutant discharge management of rivers in the Great Barrier Reef catchment area

Brodie

Lewis

Bainbridge

et al. 2009

Mar. Freshwater Res.

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Abstract. Water Quality Improvement Plans (WQIPs) are being developed for individual river basins on the Great Barrier Reef (GBR) catchment associated with the GBR Water Quality Protection Plan. Within each WQIP, marine ecosystem targets are linked to end-of-river pollutant (suspended sediments, nutrients and pesticides) load targets and to farm level management practice targets. The targets are linked through quantitative models; e.g. one model connects GBR chlorophyll concentrations (marine target) to end-of-river nitrate loads, a second connects the end-of-river nitrate loads to fertiliser management targets in the catchment, whereas a third model links fertiliser application to nitrate loss at the farm scale. The difficulties of applying these linked models to derive credible and practical management targets are great, given the high degree of uncertainty in each model. Our understanding of the generation of suspended sediments, nutrients and pesticides in catchments and the relationship to on-farm management, the transport of these materials to the ocean, their transport in coastal waters and their effects on marine ecosystems is incomplete. The challenge is to produce estimates from the models, with known levels of uncertainty, but robust enough for management purposes. Case studies from the Tully-Murray basin and the Burdekin basin in north Queensland are discussed.

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Fine‐suspended sediment and water budgets for a large, seasonally dry tropical catchment: Burdekin River catchment, Queensland, Australia

Bainbridge

Lewis

Smithers

et al. 2014

Water Resources Research

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The Burdekin River catchment ( 130,400 km 2 ) is a seasonally dry tropical catchment located in north-east Queensland, Australia. It is the single largest source of suspended sediment to the Great Barrier Reef (GBR). Fine sediments are a threat to ecosystems on the GBR where they contribute to elevated turbidity (reduced light), sedimentation stress, and potential impacts from the associated nutrients. Suspended sediment data collected over a 5 year period were used to construct a catchment-wide sediment source and transport budget. The Bowen River tributary was identified as the major source of end-of-river suspended sediment export, yielding an average of 530 t km 22 yr 21 during the study period. Sediment trapping within a large reservoir (1.86 million ML) and the preferential transport of clays and fine silts downstream of the structure were also examined. The data reveal that the highest clay and fine silt loadswhich are of most interest to environmental managers of the GBR-are not always sourced from areas that yield the largest total suspended sediment load (i.e., all size fractions). Our results demonstrate the importance of incorporating particle size into catchment sediment budget studies undertaken to inform management decisions to reduce downstream turbidity and sedimentation. Our data on sediment source, reservoir influence, and subcatchment and catchment yields will improve understandings of sediment dynamics in other tropical catchments, particularly those located in seasonally wet-dry tropical savannah/semiarid climates. The influence of climatic variability (e.g., drought/wetter periods) on annual sediment loads within large seasonally dry tropical catchments is also demonstrated by our data.

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Sources of sediment to the Great Barrier Reef World Heritage Area

Cited by 148 publications

References 15 publications

Tasas de erosión e índices geomorfológicos en tres cuencas costeras al sur de la península de Baja California, México

Tasas de erosión e índices geomorfológicos en tres cuencas costeras al sur de la península de Baja California, México

Target setting for pollutant discharge management of rivers in the Great Barrier Reef catchment area

Fine‐suspended sediment and water budgets for a large, seasonally dry tropical catchment: Burdekin River catchment, Queensland, Australia

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