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I donít know exactly but it looks like theyíre using sod as a bunker liner, which is a cheap option to the porous liners or fabric. As Daryl described, the sod is let knit so it creates a strong thatch, which bonds the soil. Itís then killed off and the sand added. The thatch keeps a separation between the soil and sand, which reduces contamination when the sand washes and also prevents stones from working up from the bunker floor. It works well provided there isnít much water washing into the bunker as it erodes the organic layer at that point over time, but it works really well and holds up on flat areas.
After they are done with this correction, will they be better able to keep sand in the bunkers? Currently the bunkers are woefully inadequately filled with sand. Some places you are hitting off of hard ground.
Alan:In this case, the sod liner is just there to stop the wind erosion from going beyond a certain depth. Some of those bunkers had gotten six feet deeper than when they were built, despite regular replenishment!I am not sure this will do much more than require them to refill the bunkers more often, though.