Catchment soils supply ammonium to the coastal zone - Flood impacts on nutrient flux in estuaries

O’Mara, Kaitlyn; Olley, Jon; Fry, Brian; Burford, Michele A.

doi:10.1016/j.scitotenv.2018.11.077

Cited by 16 publications

(4 citation statements)

References 54 publications

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“…Soil is a porous and three-phase medium (water, air, minerals) in which micro and macro-organisms from the plant and animal world do living. The lack of water absorption by soils is one of the main causes of the genesis offloading (O'Mara et al 2019). For that reason, the identification of the soil types in any study area is very important, but the preparation of the soil map needs to use FAO data.…”

Section: Soilmentioning

confidence: 99%

Prediction of Flash Flood Susceptibility Using Fuzzy Analytical Hierarchy Process (Fahp) Algorithms and Gis: A Study Case of Guelmim Region in Southwestern of Morocco

Talha

Maanan

Atika

et al. 2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. In recent decades, many of the countries around the world as well as the south-western Morocco (Guelmim region, Assaka watershed), was subject to flood-storm causing huge human and material damages. The current study focuses on the Prediction of flash flood susceptibility using Fuzzy Analytical Hierarchy Process (FAHP) algorithms and Geographic Information System (GIS) technical. Flash floods areas were identified based on seven flash flood conditioning factors (Soil Moisture Index (SMI), Drainage Density, Rainfall, LULC, Altitude, Slope and Soil). Using AHP the weight derived for the factors were SMI 37% Rainfall 24.30%, Drainage Density 15.57%, LULC 9.98% Altitude 6.39% Slope of the river basin 4.06% and Soil type 2.70%. Then, applying a fuzzy inference system to create flash flood vulnerability maps. The resulting maps were classified into three categories: low, moderate and high flash flood susceptibility; indicated that the areas at the outlet of the watershed and which are close of the main affluent wadis (Seyyad and Oum Al-Achar) were very susceptible to flooding. This study will be helping these zones to be prioritized for the conservation and managing of flash floods.

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Section: Soilmentioning

confidence: 99%

Prediction of Flash Flood Susceptibility Using Fuzzy Analytical Hierarchy Process (Fahp) Algorithms and Gis: A Study Case of Guelmim Region in Southwestern of Morocco

Talha

Maanan

Atika

et al. 2019

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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“…The Brisbane River catchment, during an average year, exports approximately 178,000 tonnes (Eyre et al, 1998). Recent studies have highlighted that suspended sediments are more important than previously thought as an immediate source of ammonium to stimulate phytoplankton growth (Franklin et al, 2018;Garzon-Garcia et al, 2018;O'Mara et al, 2019) and long term, silt deposition from flood events is filling the deeper basin of the Bay which will increase benthic-pelagic coupling (Coates-Marnane et al, 2016;Lockington et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Both the concentration of nutrients and the particulate/CDOM load in the water column decrease with increasing distance from the river mouth (O'Donohue and Dennison, 1997;Dagg et al, 2004;Gaston et al, 2006;Glibert et al, 2006;Schroeder et al, 2012;Dorado et al, 2015). During a flood event, the highest biomass can often be around the seaward edge of the flood plume where the particulate loads have descended to lower in the water column or the CDOM concentration has been diluted, therefore increasing light availability to surface waters and allowing phytoplankton populations to respond to the increase in nutrients that have disassociated from the particulate material to become bioavailable (Smith and Demaster, 1996;Lohrenz et al, 1999;Saeck et al, 2013a;O'Mara et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of a Once in 100-Year Flood on a Subtropical Coastal Phytoplankton Community

et al. 2021

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Subtropical systems experience occasional severe floods, dramatically altering the phytoplankton community structure, in response to changes in salinity, nutrients, and light. This study examined the effects of a 1:100 year summer flood on the phytoplankton community in an Australian subtropical bay – Moreton Bay – over 48 weeks, from January to December 2011. Immediately after maximum flood levels were reached on the rivers flowing into the bay, the lowest salinity, and highest turbidity values, in more than a decade, were measured in the Bay and the areal extent of the flood-related parameters was also far greater than previous flood events. Changes in these parameters together with changes in Colored Dissolved Organic Matter (CDOM) and sediment concentrations significantly reduced the light availability within the water column. Despite the reduced light availability, the phytoplankton community responded rapidly (1–2 weeks) to the nutrients from flood inputs, as measured using pigment concentrations and cell counts and observed in ocean color satellite imagery. Initially, the phytoplankton community was totally dominated by micro-phytoplankton, particularly diatoms; however, in the subsequent weeks (up to 48-weeks post flood) the community changed to one of nano- and pico-plankton in all areas of the Bay not usually affected by river flow. This trend is consistent with many other studies that show the ability of micro-phytoplankton to respond rapidly to increased nutrient availability, stimulating their growth rates. The results of this study suggest that one-off extreme floods have immediate, but short-lived effects, on phytoplankton species composition and biomass as a result of the interacting and dynamic effects of changes in nutrient and light availability.

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“…Around 7.5 cal kyr BP, surface elevations were as low as −6 m AHD under Lake Albert and could therefore have been inundated at sea-levels much lower than present. Recently flooded land can mobilise substantial nutrient loads (Eyre and Twigg, 1997; Mitchell et al, 1997; O’Mara et al, 2019), and so the recent inundation of this region, and increasing inundation of land during the formation of the estuary, would increase surface water nutrients and primary productivity, possibly explaining the accumulation of sapropel within these palaeolakes. Restricted water exchange into this environment would also explain the low levels of detrital sedimentation during accumulation of the sapropel units.…”

Section: Discussionmentioning

confidence: 99%

Multi-stage Holocene evolution of the River Murray Estuary, South Australia

et al. 2020

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The River Murray Estuary, South Australia exhibits a morphology typical of a wave-dominated estuary and comprises two large, shallow central basin lakes – Lakes Alexandrina and Albert. Contested interpretations of the estuary’s limnological history and uncertainty surrounding the sustainability of current basin water usage practice warrant a robust investigation into how the system has evolved. Here we combine lithostratigraphic, geochemical and sedimentological evidence from a transect of sediment cores to reconstruct the sediment infill history of the system. We uncover multiple stages of sediment infill over the history of the system, associated with (1) the low gradient morphology of the estuary and lower river channel, (2) the mid- to late-Holocene sea-level regression and (3) anthropogenic modifications to the fluvio-estuarine system. We show that while estuarine conditions in the system were fully established during the mid-Holocene highstand (~6.4 kyr BP), central basin facies sedimentation was focussed further inland before prograding with the lowering of base level and shifting of tidal influence as sea-level fell. Central basin facies sedimentation within northern Lake Albert occurred from 5.4 to 4.0 cal kyr BP at ~0.25 cm yr-1. The uppermost accumulation of this unit was eroded by continued reduction in base level until sea-level regression concluded at 3.5 cal kyr BP. Barrage and weir installation (1940 CE) re-initiated and expanded central basin facies sedimentation in the estuary (~0.32 cm yr-1). Recently deposited sediments exhibit geochemical markers of increased trophy and more frequent acid sulfate soil acidification, exposing human impacts on the estuary.

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Catchment soils supply ammonium to the coastal zone - Flood impacts on nutrient flux in estuaries

Abstract: Catchment soils supply ammonium to the coastal zone -Flood impacts on nutrient flux in estuaries. Stoten (2018),

Cited by 16 publications

References 54 publications

Prediction of Flash Flood Susceptibility Using Fuzzy Analytical Hierarchy Process (Fahp) Algorithms and Gis: A Study Case of Guelmim Region in Southwestern of Morocco

Prediction of Flash Flood Susceptibility Using Fuzzy Analytical Hierarchy Process (Fahp) Algorithms and Gis: A Study Case of Guelmim Region in Southwestern of Morocco

Effect of a Once in 100-Year Flood on a Subtropical Coastal Phytoplankton Community

Multi-stage Holocene evolution of the River Murray Estuary, South Australia

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