mysterious old hachure

So far I haven't done any hachure except for something different, I've called it "double hachure".
I'm trying now, it's also not exactly according to Max's original definition, there aren't as many blank lines.
Let me see what comes out of it, because I don't quite understand what "wave method", "alternation" etc. means.
It's simple, I think, but I think my other hanjies are simple too... ;)