Many deltas can be characterized as wave-, river- or
tide-dominated, but others show some of the effects
of each of these processes. In the following images,
focus on the overall shape of the delta to infer the
- To identify river-dominated deltas, look for thin
fingers of the delta protruding into the basin. It
also helps to consider if the delta is located in
a protected area, away from strong currents or waves.
- A smooth coastline is the main characteristic of
- Tide-dominated deltas generally show wide lobes
of land perpendicular to the coast.
! Click each dot to see an image of a delta. Examine
the delta and consider how all three processes work
to shape it. Infer which process is dominant in each
image, then answer question 2 below.