© Boardworks Ltd 20041 of 42

The River Conwy has deposited material in this section of its course. Suggest reasons why this has happened.

Meander bend on the River Conwy

A B

Explain why there is more deposition at ‘A’ rather than at ‘B’.

The meander from above.The meander from above.

E

ED

D

E

E

D D

E

D

E

E

E

D

D

D

Task:Task:Draw and explain in your own words how a meandermeander forms by erosion and deposition.

Formation of a Formation of a meandermeander

This is a cross section of a meander bend. Where would the following go?

slip off slope river cliff

area of depositionundercutting

fastest velocity

Oxbow lakes

On this meander bend where would you label the line of highest velocity?

1. 4.3.2.

Draw these four diagrams in the correct order of oxbow lake formation. Then match 3 of the diagrams with the most appropriate explanation from ‘A’, ‘B’ and ‘C’.

A. The river floods and erodes through the thin meander neck. The river now takes the easier, straight course. The meander loop is left as an oxbow lake.

B. The fastest flow is on the outside bend of the meander. This fast current erodes the meander neck through the processes of erosion.

X XXXXX = erosion on the outside of the meander bend

C. The meander neck is further eroded until only a thin piece of land separates the two channels.