![]() A crest formed by cones and a bulge area could be interpreted as injection structures. This manuscript describes several surficial features using multibeam echosound. Part of the sediment was injected into the marginal areas, where the load pressure is minor, causing significant vertical movement in the floor of the estuarine channel. ![]() The weight of that enormous amount of waste produced active subsidence in the underlying sediment. This waste was stockpiled in a stack 25 m high, covering 1200 ha of what was once a salt marsh. For more than 40 years, the industrial complex which developed near Huelva (in SW Spain) produced a huge amount of phosphogypsum as a waste product of manufacturing fertilizers.
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