The flood shoals are highly variable in size and location, but have different basic shapes at these two inlets due to differences in morphology of the two estuaries.
(The flood shoals; are; highly variable in size and location) (The flood shoals; have; different basic shapes at these two inlets due to differences in morphology of the two estuaries)
The flood shoals The flood shoals
are have
highly variable in size and location
different basic shapes at these two inlets due to differences in morphology of the two estuaries