To many particles go out and some of them float in the air

Greetings everyone!

I am working on 3D debris-flow problem with HBP model, but always goes out to many particles during the simulation and some of them float in the air as shown in attached images:


and Nearly a third of the particles were eliminated (There are nearly 100,000 fluid particles in total):

Can anyone please help?

Thanks and regards,

Ma. YF

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