Thanks dear Chi-Tuan,
I have tried to implement "something" in USER_CONDIN_TRAC. As I wish to simulate the suspended sediment transport I need the variable "CS" to be spatially varying. I am having only one sediment size class. The USER_CONDIN_TRAC, which I have made, is attached. The program gets compiled but gives a segmentation error at the starting itself. Unfortunately I haven't come across any discussion where spatially varying suspended sediment concentration is imposed as an initial condition.
It would be really helpful to understand where I have gone wrong.
Thanks in advance.