Autumn 2014 Newsletter

Welcome

Welcome to the third twice yearly newsletter for the iCOASST project. These newsletters will:

Posted 20/10/2014 14:46


Figure 1. Bed load residual transport streamlines (top) and flux arrows (bottom); length of arrow is independent of flux magnitude. On the left TELEMAC residuals for lunar year 2008; the background colour represents sediment transport magnitude; thick bla

Bed load sediment pathways offshore in Liverpool Bay

A main aim of coastal area modelling in iCOASST is to determine long -term large scale residual sediment pathways. Working towards this aim, the figures below show residual bed load pathways for Liverpool Bay in 2008 from TELEMAC2D and POLCOMS. POLCOMS is 3D and includes the effects of temperature and salinity variations; TELEMAC2D is depth-averaged and so does not include these effects but it uses an unstructured model grid and hence can accurately resolve local features such as the Mersey training walls. Here results are presented assuming a uniform sandy bed and without wave effects. Pathways are shown; magnitudes of sediment flux will be assessed later.

Posted 17/09/2014 10:37


Figure 1: Schematization of ESTEEM architecture showing representation of tidal hydrodynamics and channel sediment flux, parameterized tidal flat sedimentation, and largely rule based high intertidal sedimentation.

ESTEEM – A hybrid model of Estuary Morphological Evolution

The iCOASST project aims to provide tools and models that will allow coastal managers and academics to predict scenarios of coastal evolution over the decadal time scale, and a significant part of the effort has been applied to the development of new reduced complexity models. Estuaries pose a particularly interesting set of problems for modelling longer-term coastal evolution, as they comprise a number of disparate systems that respond to hydrodynamic forcing in different ways, and also interact with each other in complex ways.

Posted 17/09/2014 12:19


Figure 1. A wide range of landscapes occur along rocky coasts, so anticipating future erosion rates requires broad, systemic approaches. Panels 1 to 11 provide examples of different types of rock coasts around the UK: (1-3) cliffs fronted by shore platfor

Cliff Erosion and Relative Sea Level Rise

One of the most certain consequences of global warming is an increase of global (eustatic) sea level. The influence of this increased sea level rise on cliff erosion rates trends is still an area of active research. Trends in cliff erosion rates are controlled by trends in the external forcing (e.g. sea level, wave height, period and direction) as well as the dominant morphodynamic feedbacks that occur through time. While wave conditions may not change significantly over the next century, the influence of human interventions and sea level rise is expected to be increasingly important. In the following text we briefly introduce the importance of feedbacks for cliff management and present a method to quantify the likely future cliff erosion trend.

Posted 17/09/2014 10:25


Figure: Location and morphology of the Deben inlet, Suffolk

Towards a generic inlet model and application on the Suffolk Coast

One of the goals of iCOASST is to develop new models that are capable of capturing and simulating the dynamics at the inlets of estuaries. This is essential as iCOASST seeks to improve predictions of the evolution of coastal systems that stretch up to hundreds of kilometres, including parts of the coast that are interrupted by one or more estuarine inlets. The erosion of beaches and cliffs is significantly influenced by the presence of these inlets as they interrupt the continuity of longshore sediment transport. Although the interaction between estuarine environments and the open coast is critical in driving the morphological evolution at the mesoscale (10 to 100 years and 10 to 100 km), our knowledge of the governing processes at this interface is often limited. Where estuaries and the open coast meet, waves and tides as well as rivers move sediment around in a complex manner. This meeting area of hydrodynamic processes is further influenced by the supply of sediment from a variety of sources. Sediment can be delivered from rivers, offshore, and adjacent shorelines. Altogether, estuarine inlets form a real challenge when it comes to the development of coastal morphodynamic models.

Posted 17/09/2014 10:32


A single SCAPE simulation representing 5000 years of shore profile change

SCAPE+, an Open Source Model for the Open Coast

A key objective of the iCOASST project is to provide modelling tools capable of representing large scale and long term coastal change (also called 'Mesoscale' change).

Posted 17/09/2014 10:43


Upcoming activities

iCOASST Consortium meeting 12-14 Nov 2014, Swansea

Posted 20/10/2014 14:53


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