There are numerous crochet patterns available for a Ripple (or wave, or chevron), shawl. I attached one from Lionbrand. I wasn't sure if you wanted just a pattern or also instructions, so I attached a few YouTube videos, also a written tutorial with wonderful photographs if that might be easier for you to follow.
The same Crochet techniques will be known by different names. The chevron and Ripple are the same in crochet. Some will call this technique the Zig-Zag. Now there are variations of how deep and how curved the chevron and ripple are with each technique. If you go to YouTube and search for Chevron, Ripple, and Zig-Zag crochet, you will find the variations that go by Chevron, Ripple, and Zig-Zag , yet the technique is the same.
Choose which one you want to have as the base, the ripple or the straight. The easiest way is to attach to the ripple and work and increase through the low point of the ripple until you have the same amount of stitches as in the first row of the straight or the width is the same. Then just whipstitch together, if this isn't enough info then contact my message board and I'll help however I can.
Search for "granny ripple afghan". There is one at Project Linus and another at Purple Kitty to start.
Claus Schall was born in 1757.
Claus Schall died in 1835.
Margrethe Schall was born in 1775.
Margrethe Schall died in 1852.
Elke Schall was born in 1973.
Zeca Schall was born in 1963.
Peder Schall was born in 1762.
Peder Schall died in 1820.
Johanna Schall is 165 cm.