WotLK texture problem

[TE1337]

how to fix this

https://ibb.co/fv4wLyR

terrain does not blend well

[tekken360]

You could try these following commands:
/console gxdepthbits 24
/console gxcolorbits 24
/console gxrestart

They resolved issues I had in the past with shimmering textures after I had installed a new graphics card.
If it still doesn't work/have any effect, you could also try changing the directx api version used.