12/06/2011

Floodplain Modeling Using HEC-RAS Review

Floodplain Modeling Using HEC-RAS
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We all know that practical hydraulic modelling of real-life situations throws up a range of problems that are rarely found in standard text books or software manuals. However, this very comprehensive book covers every scenario that is conceivable - and a few that are not!
It does not dive straight into detailed modelling methods, but explains what tools are available, and stresses the need for planning a modelling study, and, crucially, it includes a full chapter on data requirements - the lack of which is the usual bane of any modeller's life. These chapters needs to be read by anyone who wants to obtain realistic results from a river model.
Although we might think of 'floodplains' as wide open expanses, in fact they tend to be obstructed at intervals with embankments, having bridges and culverts to carry flood flows through them. These structures are fully addressed in the book, with a chapter on each, giving comprehensive guidance on how to model the variety of shapes and conditions that may be encountered in practice.
Modelling is usually required if there is a flooding problem, which may require physical flood alleviation works, so a chapter has been included to give guidance on this aspect of the modeller's work, and how to examine different scheme scenarios and assess their impacts.
However, where the book really surpasses others is in its detailed treament of special cases, which include levees, sluice gates, weirs and split flows - all features that I come across frequently with the legacy of old water mills in the UK, and which can lead to some complex multi-looped systems. Ice cover and ice-jam modelling is also covered, but I don't think I will be needing to use that - especially if the global warming predictions come true!
Other aspects covered include scour and the problems of mobile beds - and this is where having the right data is so important.
The methods of approach for different scenarios cover both steady-state and unsteady-state (hydrodynamic) modelling, but as the latter requires some additional considerations these are covered in a separate chapter.
All-in-all this is an excellent volume, and one that should be beside every modeller's workstation for easy reference. Even modellers who do not use HEC-RAS will find some extremely practical and useful guidance within.

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If your work or academic studies involve floodplain management, then a copy of Floodplain Modeling Using HEC-RAS needs to be on your desk. This comprehensive textbook offers expert instruction and practical advice for floodplain modelers and managers. It then goes a step further and shows readers how to apply HEC-RAS, the worldwide standard simulation tool from the U.S. Army Corps of Engineers.

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