The phrase "a gradual process which" is correct and usable in written English.
It can be used to describe a process that occurs slowly over time, often in contexts related to change, development, or improvement.
Example: "Learning a new language is a gradual process which requires consistent practice and patience."
Alternatives: "a slow process that" or "an incremental process that".
But this is a gradual process which will take place over several days and weeks.
He described his radicalization as a "gradual process," which accelerated when he became friendly with people who had taken up arms to fight for Islamic causes.
I was placed in the WRAG after being diagnosed with bi-polar, and although my condition has improved with treatment & lots of assistance from mental health teams, and I have been able to undertake voluntary work, I am all too aware that gaining stability is a gradual process which can be fragile.
Meanwhile, unlike moving from other region, aging is a gradual process which could not lead older adults to abandon their habit of driving immediately.
It is a gradual process which occurs when the impact of water detaches and removes soil particles causing the soil to deteriorate.
This is not an entirely new development, but rather an extension of a gradual process which has seen cash decline in favor of plastic cards which were once run through machines that took copies of them on paper slips, then were swiped electronically, and are now increasingly inserted, tapped, or even ignored altogether in favor of fully electronic methods.
It was a gradual process in which women literally disappeared from Jerusalem".
It was a gradual process in which more sympathetic, albeit firm, US engagement might have helped sway Japan in a different direction.
It was a gradual process by which people realized that a city could develop an image that attracted people or repelled them.
We show that end-on conversion is a gradual process during which lateral kinetochores seldom detach.
Under these conditions, weaning is a gradual process in which the contact between the sow and her offspring continuously decreases.
