EM 1110-2-1100 (Part II)
30 Apr 02
Figure II-3-13.
STWAVE results for a 1:30 sloping beach
the oblique angle dilemma often can be resolved by using a different grid). STWAVE may underrepresent
wave focussing for very narrow swell.
II-3-6. Guidance for Performing Wave Transformation Studies
a. Introduction.
(1) The preceding parts of this chapter provide the engineer with an understanding and some techniques
for taking a wave condition offshore of a project or nearby and transforming it to the site of interest. In
practice, an engineer will typically consider a suite of wave conditions perhaps representing different storms,
different seasonal characteristics, and different water levels (particularly in shallow water or at the beach if
there is a high tide or storm surge to be considered). Selection of the conditions for project design studies
is a very important component of any coastal engineering study and Part II-2 and Part II-3 both treat this
problem.
(2) Transformation analyses are needed because there is often a lack of site-specific data. In some
instances, a cursory transformation analysis may be required to help decide whether an offshore or nearby
site is adequate for determining offshore boundary conditions. Typically this may be approached by setting
up one of the transformation procedures described and running a small set of wave conditions that might span
Estimation of Nearshore Waves
II-3-31
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