I would be tempted to construct 4 'panels' of the desired height and wide, then 'assemble' them where you need to protect the melons or whatever.
Set a diagonal brace from panel to the neighbouring panel for stability.
Anchor them by tying bricks or blocks to the 'panel' of sufficient weight to avoid the wind thing. Not requiring any 'posts' the Septic system is safe.
Spacing the boards far apart will lessen the wind load. Or better yet, use stucco wire instead of boards for the panels.
Less wind profile and the wire could also be stretched across the top since deer and critters can jump/climb 9 ft fences easily enough, but the top stucco wire may be effective in keeping them out.
Use diagonals lower down as well and the whole thing should be wind/critter proof easily enough.
Stucco wire comes in 4 ft wide rolls (I think) so that should be plenty large enough for a melon patch.
Another thought would be to make small 'mounds' for each melon plant and not 'cultivate between them like a garden so these portable protective fences can be placed over individual plants and not the entire 15 x 15 area???
Just a couple of thoughts.
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