The Shape of Water
Dr Anjani Ganase looks at the influence of rivers, the creation of deltas and the places where the sea comes in. River deltas are formed where rivers meet the ocean. The dynamic water movement driven by the forces of waves, tides and river flow all shape deltas and result in unique wetland ecosystems that live within the narrow margins between the land and sea. As seasons change, as storms surge and tides turn, we also observe shifts in the distribution of soil, vegetation and aquatic life that utilise the confines of the delta. Rivers bring soil from inland, and the sediment settles out as the river slows where it nears the ocean. This is because of the flatter, even terrain that occurs when the river reaches sea-level that allows the river to widen as it is no longer is restricted by the river banks and can spill over a low lying flood plain. Apart from the river flow, ocean waves, tides and even the spin of the earth (coriolis effect - which is the deflec...