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The Douro estuary (Portugal): a mesotidal salt wedge ArchiMer
Vieira, Mario Ec; Bordalo, Adriano A.
The Douro River drains a large part of the Iberian Peninsula before it flows into the Atlantic Ocean in northern Portugal. Although heavily dammed throughout its course, the Douro forms a mesotidal estuary in the last 22 km. Na data had ever been collected in this estuary prior to 1994. An analysis of salinity data measured once a month in 1994 and current data obtained in the fall of 1994 revealed a salt wedge estuary highly dependent on river discharge: strong vertical salinity stratification under conditions of low runoff, whereas during high river flows the whole estuary became a river. The tide in the fall of 1994 was very close to a standing wave throughout the estuary; the tidal range, as high as 2.8 m at spring tides, was not powerful enough to...
Tipo: Text Palavras-chave: Circulation estuariene; Coin salé; Modèle en boı̂te; Temps de residence; Douro; Estuarine circulation; Salt wedge; Box model; Residence time; Douro River.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43382/42829.pdf
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Isopodes aselloïdes stygobies d’Espagne, IV – Stenasellidae: taxonomie, histoire évolutive et biogéographie Naturalis
Magniez, Guy.
The entire family Stenasellidae Dudich, 1924 is composed of ancient stygobitic strains sharing a thalassoid and thermophilic origin. Its presence in Europe is dependent on two factors, the permanent existence of emerged continental shields during long geological periods (at least Tertiary + Quaternary), and its conservation in favourable areas during the different glacial crises. The iberian peninsula seems to have been the most suitable european region for the survival of this stygofauna. Some 119 samples from 116 different localities -scattered over 19 Spanish provinces- have been studied. All aquitanian and iberian stenasellids belong to the traditional genus Stenasellus Dollfus, 1897. We must notice that the stenasellids seem to be absent in the betic...
Tipo: Article / Letter to the editor Palavras-chave: Active expansion; Alluvial channels; Ancient and quaternary settlements; Douro; Ebro; Guadalquivir and Garonne Rivers; Paleobiogeography; Spanish groundwaters; Superspecies; Stenasellus virei; Thalassoid stygobites.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/505100
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