QuestionGeomorphology / estuaries
The edge effect at the contact of continental fresh water and sea water results in:
- (a) non-deposition of sediments due to turbulence.
- (b) deposition of sand due to fall in system energy.
- (c) deposition of organic matter due to density difference.
- (d) flocculation of clays resulting in formation of mud deposits.
Answer: (d) flocculation of clays resulting in formation of mud deposits.
At the river-sea contact (estuary), dissolved salts neutralise the charge on suspended clay particles. The clays flocculate, settle and build mud flats. Remember: salinity, not just loss of velocity, drives estuarine mud deposition.