What is the purpose of formation of bunds in reclamation?

Reclamation works normally proceed behind the seawall to protect against typhoon attack. In case where soft marine mud is encountered during reclamation, bunds may be formed on planned alignment of road and drainage works and locations of early development to displace mud to other less important areas should mudwaves indeed occur. Reclamation may be carried out in strips or even crossed bunds forming a grid. Hence, if mudwaves really occur, they could be isolated and dealt with individually.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.