According to the book’s Preface, generations of scientists, surfers, and sailors have used Willard Bascom’s 1964 classic, Waves and Beaches, or its 1979 second edition, to understand the behavior of water waves and beaches. Growing up 1000 miles from the nearest ocean, I was not among those readers. However, I now live on an island along South Carolina’s Atlantic coast, and my interest in ocean science has climbed sharply.
Bascom was not an academic scientist, but a marine engineer, oceanographer, and adventurer whose enthusiasm for the science was communicated through his writing. He passed away in 2000, and decades after the second edition, Kim McCoy and Patagonia (the American outdoor clothing and gear company) have published a third edition. McCoy has added an update of nearly half a century of oceanographic science, the evolution of instrumentation, and a description of planetary climate change – while preserving a substantial portion of Bascom’s original text. I should mention that this edition also includes some stunning photography.
Unfortunately, I found the merge of two purposes and styles to not be smooth. On the one hand, it is a science and engineering text, giving equations of idealized and observed ocean behavior. On the other hand, it is also a treatise on global climate change and environmentalism. In particular, in the opening chapters, the climate change topics seem simply inserted, when the overviews might have been wholly re-written. Especially irritating was the insistence that climate change be considered a literal wave. The very first sentence of the book defines a wave to be “an undulating form of energy propagating through a medium,” The human-caused component of climate change we are experiencing at this time involves transition of the ocean, permanent or temporary, but it is not that kind of wave.
Compare for example, the analytical style for both idealized and realized waves: (unfortunately square root and other symbols may not display correctly on goodreads):
Wavelength L =( g/2π)T² where g is gravitational acceleration, T is period.
In real oceans of Earth, using metric system, L=1.56 T².
Wave velocity “celerity” C = ((gL/2π)tanh(2πd/L)) where d is water depth.
Convenient approximations are used:
• d/L > 0.5 is a deep water wave, tanh(2πd/L) is nearly 1, so C = (gL/2π)
• d/L < 0.05 is shallow water wave, tanh(2πd/L) is nearly 2πd/L, C = (gd)
• 0.05 < d/L < 0.5, use full equation.
In real oceans of Earth, at steepness of 1:7, wave velocity is 10% more than theoretical value.
Wave steepness H:L, where H is wave height
In real oceans of Earth, max is 1:7, with a 120° crest angle
Internal Waves (on boundary layers of waters of different density).
N = ( (gravity/density) x (density/depth) ) where N is buoyancy frequency.
Large N indicates stable stratification.
Wave velocity for Waves of Translation.
C = (gd) where g is force of gravity, d is depth of water plus wave height.
In contrast, we have campaigning on climate change (Chapter 5) – “like in North Carolina where they passed HB 819 in 2012, have strangely banned policies from being based on climate change predictions. Unfortunately, six years later, in September 2018, Category 4 Hurricane Florence produced large storm surges and inundated much of the Carolina coastline and the offshore islands. North Carolina may have proved it can ignore the findings of climate scientists, but it cannot escape the impacts of climate change. Unfortunately for the US citizens living in these coastal areas, the US federal government has yet to provide a national policy on coast climate change.” … “In many other countries, including the United Kingdom, climate change is being maturely addressed by local councils and environmental agencies.”
Please understand that I actually fully agree with the book’s position on this and other things, but am using it now to illustrate the incongruous directions. I would like a quantified theory relating increased thermal energy of atmosphere and ocean to wave and beach behaviors. I would like a quantified theory relating sea level rise to wave and beach behaviors. Instead, it catalogs natural and man-made disasters of recent history. Climate science is a scientific study, not headlines. To me, it represents a lost opportunity to understand 21st century issues in the same analytical light that Bascom shed in the 1960s and 1970s.
All the joy for me came in the science and engineering text sections. I guess I’m still waiting for the fourth edition. Maybe I could even recommend inclusion of the propagation of acoustic and electromagnetic waves in ocean waters for that future edition.
I read a copy of Waves and Beaches; The Powerful Dynamics of Sea and Coast, 3rd Edition, by Willard Bascom and Kim McCoy in Protected PDF using Adobe Digital Editions, which I received from Patagonia through netgalley.com in August 2021, in exchange for an honest review on social media platforms and on my book review blog. I have learned since, that I was provided a pre-publication version, though the book had been published in March 2021.