The following Client presentations were included in the UGM 7 (2005) Agenda:

ABPMER / UCL: Examples of flexible mesh modelling in UK waters

Two applications of using a beta version of MIKE 21 FM Series Release 2005 in the UK are presented. The first is a high resolution model of the Solent region. The system consists of a number of smaller tributaries and estuaries in which a flexible mesh approach is obvious. The advanced flooding and drying routines and the variable resolution capability have helped to improve accuracy in the inter-tidal regions.

The second application is in the Bristol Channel, a large macro-tidal estuary in the Western U.K. Here, a combination of extreme wave events and large tides, provides the backdrop to an extremely complex modelling environment. A fully coupled flow, wave and sediment transport model (MIKE 21 Coupled Model FM) has been employed to investigate the contribution of the waves and the wave-current interaction to regional sediment transport and morphological evolution. The study has been an extreme test case for the coupled system where severe wave blocking has provided numerous challenges and restrictions to the modelling experiments.

Results of each study are presented along with a discussion of advantages, limitations and perspectives.

CDM: Implementing the Water Framework Directive in Ireland

Ireland is implementing the Water Framework Directive through a series of consultancy contracts rather than by government agencies, which is the approach adopted throughout most of Europe. CDM is undertaking the work for the Eastern River Basin District (including Greater Dublin) and is evolving an approach, which makes use of a variety of information tools, which are now being adopted nationally. These tools will be combined into a River Basin Management System, comprising a web enabled GIS and Environmental Management System, MIKEBASIN, economic evaluation and a decision support system to facilitate stakeholder involvement in the implementation of the WFD. This short presentation will outline the requirements of the WFD and how basin modelling is being applied to select the programmes of measures necessary to achieve the required good water status.

FBA / Mendip Power Group:   Flood Risk Assessment for Low-Head Micro-Hydro

The successful application of a small scale MIKE 11 FEH model to perform a Flood Risk Assessment in connection with a Low-Head Micro-Hydro scheme on the River Frome  near Bath.

HYDER:  Two-dimensional modelling of Overland Flood Flows

Two-dimensional hydrodynamic models are widely used in coastal process studies to simulate flowfields and water levels in the nearshore region.

This paper will outline the use of Mike21 to model overland flood flows from a variety of sources and the problems, both numerical and physical, to be overcome in adapting the established ‘coastal’ methodology to account for urban and rural environments.  These include a variable water source (rainfall), distinct point sources (sewer overflow) and large volume ingress (flood defence overtopping and breaching).

Limitation of the present available numerical tools will also be outlined.

Finally, results will be presented from test cases which show flow routes, flow speeds and water depths in the urban environment.

METOC: A Passage Planning and Monitoring System for Airbus A380 Wing Transport

Metoc was asked to develop a system that would deliver both forward planning and real-time monitoring information for the barge transporting Airbus wings down the River Dee.  Barge operations are restricted by a combination of shallow water depths and low bridges, which combine to give a limited operational window on each tidal cycle.

A MIKE 21 hydrodynamic model was built in order to provide water level and current flow conditions to the passage planning system.

WESTLAKES:  Whitehaven Harbour: A challenging model:

A sealock was installed in 1998 in Whitehaven Harbour to protect the town from flooding. The impact of the sealock on the hydrodynamics and the flushing characteristics of the harbour is unknown.

A numerical model of the harbour was developed using MIKE21 in order to evaluate this impact on the water quality of the harbour. The small scale of the model and the presence of a time controlled structure (sealock) have challenged the capabilities of MIKE21.

Additional papers will be added to this page in due course.