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Computational Modelling

The key to successful design and operation in port and coastal environments is the characterization of the effect of the marine environment on structures and operations. This is achieved by means of computational modelling. 

We produce simulations of almost any coastal environment in order to understand the coastal processes specific to a project or to test the effect of any change in the physical environment on the natural or built systems.

Services - Computational Modelling

Our modelling capabilities allow us to generate offshore wave climates and to propagate and transform it to the nearshore-studied site. Once near the site, we can study wave penetration and agitation, wave load on the structure and all other hydrodynamic parameters involved in the design of reliable structures. We can also identify the rates of overtopping due to waves at structures of all types, inform design of wave defence structures and allow for the assessment of overland flooding from coastal sources.

We have an excellent understanding of coastal processes through both computational modelling and employing world leading experts in their fields.  This detailed understanding allows us to advise clients in relation to beach morphology, dredging assessments, impacts of new development, and climate change mitigation and management planning.

Our ability to model wind effects, wave transformation and tidal circulation using 2D and 3D models allows us to study complex mixing processes and water quality impacts of the dispersion of contaminants from discharged effluents or through dredging/disposal operations in any waterbody. When required, we can also develop our own numerical tools to compile data and produce graphs, tables and maps that are relevant to decision-makers.

 Below are some examples of the use of computational models:

WAVE AND FLOW MODELLING: ARABIAN GULF

Services - WAVE AND FLOW MODELLING: ARABIAN GULF

The suite of Delft 3D models, from Deltares, provides powerful tools for simulating ocean currents, waves and sediment transport. These models were used to provide flow, water-level and wave data as required to address specific environmental and engineering challenges.

WAVE PENETRATION AND AGITATION MODELLING: PORT OF DURBAN

Services - WAVE PENETRATION AND AGITATION MODELLING

The MIKE 21 Boussinesq Waves (BW) model, developed by DHI, was used for the numerical modelling of wave penetration into the Vineta Harbour.

This model is capable of simulating the combined effects of refraction, diffraction, reflection, shoaling, wave breaking, wave transmission and moving shorelines.

SHORELINE MODELLING: AFRICAN SOUTH-WEST COAST

Service - SHORELINE MODELLING

A numerical shoreline model was adapted, in collaboration with the software suppliers, to accommodate the unique conditions of rapid shoreline accretion due to shoreline sediment discharges in a dynamic wave environment with steep nearshore slopes.  The model was calibrated to represent the evolution of the shoreline, incorporating accretion of some 400 m in places, over a period of 18 years.  The model is also adapted to successfully represent volumes of sand and gravel accretion in the nearshore region.

LONG WAVE MODELLING: PORT OF CAPE TOWN, SOUTH AFRICA

Service - Long Wave Modelling

Making use of the SWAN and Delft 3D Surfbeat numerical models, an assessment of long-period waves was conducted for the Port of Cape Town, South Africa. Long-period waves affect the moored container vessels in the port, and are the forcing driver for the moored ship motion study.

The non-linear long wave modelling tool, Delft3D-Surfbeat, allows the simulation of bound and free long wave propagation over a large domain.  The wave boundary conditions for Surfbeat are obtained from the SWAN model, which is used to determine the refraction and shoaling of the swell waves from deep water up to the boundary of the Surfbeat model.

MOORED SHIP RESPONSE MODELLING

Services - Moored Ship Reponse Modelling

A suite of numerical modelling tools were used to assess the motions of a moored vessel as well as the forces in mooring lines and fenders.  The suite of models allows the assessment of different vessels with different mooring arrangements under various wave conditions.  Using the output data and the PIANC guidelines, it is possible to determine the downtime of operations. 

Combined with the wave modelling, problematic wave and wind conditions can be evaluated, allowing the determination of potential short term and long-term solutions to reduce vessel motions.

INTEGRATED WAVE TRANSFORMATION, OVERTOPPING AND INLAND FLOOD MODELLING: ST HELIER, JERSEY

Service - INTEGRATED WAVE TRANSFORMATION, OVERTOPPING AND INLAND FLOOD MODELLING

Informed by extreme value analysis of offshore wave climate data and storm surge, a MIKE21 Spectral Wave model was used to transform offshore waves to a nearshore wave climate at St Helier, in the English Channel. Many simulations were carried out to identify the critical case using in-house automation skills.

Outputs from the wave transformation were used with our automated version of the European Overtopping Manual to calculate wave overtopping rates for input to a MIKE21 hydrodynamic model representing the topography of the town.

Through this process, the effectiveness of flood and wave defence options can be tested to inform the design process.

HURRICANE MODELLING: BERMUDA

Service - HURRICANE MODELLING

To inform the development of the international airport on the island of Bermuda, a coupled MIKE21 Spectral Wave and Hydrodynamic model was used to calculate the storm surge and wave setup at the development site and to identify the risk of flooding on land. The coupled approach allows for the assessment of feedback between hydrodynamic and wave processes, which is of particular importance under the forcing conditions produced by hurricane force winds and pressure surges.

For additional information on how we can assist you, contact us.