I think your thinking of solarizeing your soil/sod/grass.but takes a bit of time.
1.You soak the area very well(like run a sprinkler for 30 minutes)in winter when grass is dormant you can leave in place but in summer time you'd still be removeing your existing grass/sod.
2.you cover you very wet area& any amendments would be added now(fertilizers,bonemeal ect.)
3 best done with 2 layers of plastic so can trap heat inbetween plastic.Important to keep soil wet and takes roughly 6 weeks
I have a bed I've'cultivated' the
weeds/grass out of and planted in.I still pull up
weeds and some grass still& once get more plantings settled in I will mulch to make my summer more better and more time for enjoying my AC.I amended the soil with 400 lbs of organic mix.I still have one bed left to go same hex shape but has 4 points& very very tempted to just till it with tiller.my finger is peeling skin where them thorns we're wrecking havock.