Wow, yes that's quite specific. Anyway, if you need a good book on the maths of river dynamics I recommend the textbook by Carling and Dawson, see attached info.
Open Channel Hydraulics, River Hydraulic Structures and Fluvial Geomorphology. Radecki-Pawlik, Artur, Stefano Pagliara, and Jan Hradecky. new book in 2017.
Dear Mr. Darshan Mehta, for your kind information, I want to tell you that the books which you have suggested are already suggested by other people!! Please read the previous answers. Suggest some other new books.
Ashwini Tiwari Dear, the books you suggested are already suggested by other people!!!! Please read the previous answers.
Just to get a handful of reads on the profiles, people are just copying and pasting the names of books previously suggested here. By repeating the same names of books again and again, what kind of new knowledge you people are sharing here?
You people have degraded the value of the original question.