The Patos Lagoon (Fig. 5.1a) situated in Southern Brazil, between 30 and 32°S is a very important water resource system for the Rio Grande do Sul State. It serves as nursery ground for important commercial fish and shrimp species sustaining a fishery production of 182 kg ha-1 yr-1 in average (Castello 1985). Major man activities are navigation and recreation. It also receives untreated domestic, agricultural and industrial sewage disposals produced by population living along the margins of the lagoon. The construction of two 4 km long jetties fixed the entrance and allowed navigation along the entrance channel. About 14 million m3 of sediments where trans-ported to the coastal zone in the first two years after the construction of these structures (Motta 1969). In recent years the channel has been constantly dredged to keep depth around 14 m.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Hydrographical Characteristics of the Estuarine Area of Patos Lagoon (30°S, Brazil)
Osmar O. Möller Jr.
- Springer Berlin Heidelberg
- Chapter 5
Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen