Pereira-Filho Jurandir, Rörig Leonardo R, Schettini Carlos A F, Soppa Mariana A, Santana Bruno L, dos Santos José Eduardo
Universidade do Vale do Itajaí, CTT Mar, Rua Uruguai, Itajaí, SC, Brasil.
An Acad Bras Cienc. 2010 Dec;82(4):963-82. doi: 10.1590/s0001-37652010000400019.
This study was carried out with the aim of evaluating the spatial variation of the water quality in the Itajaí-Açú River estuary. Seven stations along the estuary were monitored on a weekly basis, from October 2003 to December 2004, plus two stations in tributaries (Itajaí-Mirim River, the main tributary, and one reference station). This monitoring included measurements of salinity, pH, dissolved oxygen, temperature, nutrients(NH+4,NO3-2,NO-3,PO3-4,H4SiO4) Biochemical Oxygen Demand (BOD), total phosphorous and dissolved organic phosphorus (TP and DOP), particulate organic carbon (POC), suspended particulate matter (SPM) and chlorophyll-a (Cla). Multivariate analyses demonstrated the compartmentalization of the system based on the deterioration in water quality and marine influence. Urban development was the main factor responsible for the spatial variation of the monitored variables, resulting in increases in the indicators for organic matter and a progressive decrease in O2. Despite the effect of dilution by marine influence, there was an increase in ammonium, attributed to the influence of the municipal districts of Itajaí and Navegantes, close to the river mouth.
本研究旨在评估伊塔雅伊-阿苏河河口水质的空间变化。2003年10月至2004年12月期间，每周对河口沿线的7个站点进行监测，另外还对支流（主要支流伊塔雅伊-米林河和一个参考站点）的2个站点进行监测。监测内容包括盐度、pH值、溶解氧、温度、营养物质（NH₄⁺、NO₂⁻、NO₃⁻、PO₄³⁻、H₄SiO₄）、生化需氧量（BOD）、总磷和溶解有机磷（TP和DOP）、颗粒有机碳（POC）、悬浮颗粒物（SPM）和叶绿素-a（Cla）。多变量分析表明，基于水质恶化和海洋影响，该系统存在分区现象。城市发展是监测变量空间变化的主要因素，导致有机物指标增加，氧气含量逐渐降低。尽管受到海洋影响的稀释作用，但由于靠近河口的伊塔雅伊和纳韦甘特斯市辖区的影响，铵含量仍有所增加。
