IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
You are here : Home : News List
Go Back...

PhD position on Process-based modelling of estuarine cohesive sediment transport over seasonal to decadal time scales, University of Liverpool, UK
Estuaries are a critical interface between land and coastal ocean across which freshwater and suspended particulate matter (SPM), and consequently terrestrial carbon, nutrients and anthropogenic contaminants are exchanged. Estuarine water quality is in part mediated by its suspended particulate load; and sediments continually interact with biogeochemical processes, thus influencing estuarine ecosystem functioning. A range of physical processes in estuaries typically result in trapping of SPM that form Estuarine Turbidity Maximum (ETM) zones, and in estuaries acting as sediment sinks. In spite of this conceptual understanding of estuarine sediment transport, predictions of SPM concentrations and distributions still remain elusive (e.g., Fitzsimmons et al., 2011), in particular at time scales of seasons and longer, and there is a pressing need for improved predictions of estuarine SPM and its transport.
Estuarine sediments typically include significant fractions of cohesive material, such as mud, whose transport is subject to a range of complex processes, including flocculation, hindered settling, consolidation, liquefaction, turbulence damping, and bioarmouring (Winterwerp and van Kesteren, 2004). There is, however, a lack of simple and computationally efficient formulations unified across varying hydrodynamic regimes and seasons to describe cohesive behaviour in estuarine numerical models (e.g. Amoudry and Souza, 2011a). This project will address this critical gap and generate new improved process-based modelling approaches for simulations of estuarine cohesive sediment transport over time scales ranging from seasons to decades.
Project Summary:
In spite of significant efforts towards three-dimensional modelling of estuarine cohesive sediment transport in the past decade (e.g. Baugh and Manning, 2007; Kombiadou and Krestinitis, 2012; Ramirez-Mendoza et al., 2014), studies investigating both the estuarine spatial scale and timescales of seasons and over remain very scarce. In such three-dimensional process-based models, cohesive behaviour impacts two critical model components: particle settling rate (due to flocculation and hindered settling for example), and bed sediment resuspension and deposition (Amoudry and Souza, 2011a).
The studentship aims to increase the predictive ability of estuarine SPM at seasonal to decadal timescales and will focus on the following objectives:
derive novel formulation(s) for settling rate applicable across seasons,
implement formulations for bed resuspension and deposition that include bioturbation, consolidation and armouring,
test, calibrate, and validate model against in situ estuarine observations,
determine mechanisms controlling transport of estuarine cohesive sediments over seasons to decades.
Read more
IAHR Media Library
01 January 2020 - 30 December 2020
14th International Conference on Hydroinformatics
18 January 2020 - 18 December 2020
30th IAHR Symposium on Hydraulic Machinery and Systems
17 August 2020 - 19 August 2020
8th International Conference on Flood Management (ICFM)
See all Events