The Shuttle, in addition to the water deluge system, used a series of red nylon bags filled with water at the base of each SRB for additional sound suppression. Does the SLS, whose boosters produce ~300,000lbs more thrust, have the same system? It’s not clear to me from images or footage.
The SLS launch pad does not have the same system.
I haven't found a source with an explicit statement that says no, but I can give a sourced explanation of why the shuttle pad had the red water sausages, and why the SLS does not need them.
The red water sausages were on the shuttle pad because:
Specifically, the red water bags are used to dampen the wave of sound energy that is reflected back up toward the Space Shuttle when the Solid Rocket Boosters ignite during launch. If this powerful pulse of pressure were not suppressed, it would create a dangerous stress on the wings of the orbiter.
Source: Red Water Sausages
Note that the holes in the shuttle pad for the SRB plumes are elongated towards the left of the picture. If the holes were not so big, the pulse couldn't reflect up through them, and the red water sausages would not be needed. So why are the holes so big?
They had to be elongated to the left, because when the shuttle lifted off, it translated to the left due to the angle that the Space Shuttle Main Engines were mounted at. There was a horizontal component of thrust that pushed the stack to the left when it was still low over the pad; so low that the SRB plumes would still have damaged the pad surface.
The impingement pattern in the SRB exhaust holes changes during the 1.5 - 4 sec interval because the Vehicle is rising and also because it drifts in the Vehicle body axis plunging direction, Pad north (Vehicle -ZT coordinate direction), due to the thrust vector of the SSMEs.
You can see this northward drift in the following slow motion launch video starting at 17:47
Put your cursor on the SRB system tunnel and leave it in place. By the time it leaves the field of view at 18:40, the leftward drift is obvious.
This graph shows some actual northerly drift values (BET stands for Best Estimate Trajectory):
The SLS doesn't have this built-in drift at launch phenomenon - its engines and motors point straight down - so its launch pad hole does not have to be so elongated. It only has to allow for drift due to ground winds and vehicle dispersions.
- The red water sausages were provided mainly to protect the Orbiter's wings
- The SLS doesn't have wings
- The extra protection was required because of the elongated holes in the MLP deck that allowed the pressure wave to reflect up through them.
- The SLS hole is not elongated
Finally, if the red water sausages were placed in the SLS launch pad hole, they would instantly be destroyed when the engines / motors lit, since they would be directly in the plume. You can see in the linked video that the red water sausages survive the moment of liftoff...until the SRB plumes drift over them.