Marsh, vegetation. Photo source: ©© JMike Mahaffie
Excerpts;
Geologists suggest that an intermediate amount of vegetation, not too little and not too much, is most effective at stabilizing freshwater river deltas.
Vegetation on marsh surfaces in river deltas can slow the flow of water and cause more sediment to be deposited, helping prevent sea-level rise from drowning sensitive marshlands. But the study finds that, if the vegetation is too tall or dense, it diverts water into the river channel, resulting in less sediment being deposited on the marsh.
