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| Author(s): |
Simone Frederigi Benassi
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. , gráficos, ilustrações, tabelas. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2002-06-21 |
| Examining board members: |
Maria do Carmo Calijuri;
Antonio Fernando Monteiro Camargo;
Luiz Antonio Daniel
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| Advisor: | Maria do Carmo Calijuri |
| Field of knowledge: | Engineering - Sanitary Engineering |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS |
| Location: | Universidade de São Paulo. Biblioteca da Escola de Engenharia de São Carlos; EESC/TESE 0849; Universidade de São Paulo. Biblioteca do Instituto de Geociências; IGC/T B456 SF.e |
| Abstract | |
The objective of the present paper is to study the spatial-temporal behaviour of the limnological variables, in Bonito stream (SP), in order to evaluate the discontinuity occasioned by the sources of pollution and the self-cleaning process. To this effect, a survey was made to determine the physical-chemical, biological, climatological and hydrological variables in the longitudinal axis of the river and which utilized the QUAL2E model as a tool for simulating the concentrations of dissolved oxygen under different scenarios. It was possible to observe that many of the limnological variables studied in the Bonito rivulet suffer \"discontinuities\" due the entry of sewage. The concentrations of dissolved oxygen show a positive gradient from the source of the watercourse until station 4, and suffer a discontinuity after station 6, where the first discharge of sewage begins. The behaviour of this variable after the entry of sewage differed during the two periods studied. Furthermore, the \"Cluster\" and PCA (Principal Component Analyses) carried out upon the averages of the limnological variables distinguished different groups in the longitudinal profile of the Bonito rivulet. This distinction can be attributed to the above-mentioned entries of effluents and also resulting from the presence of the Curtume tributary. It can be verified that even with the natural assistance of the self-cleaning process, many of the variables studied fail to meet the standards of the receiving body, as stipulated by the CONAMA resolution number 20/86, in view of which, the present study suggests a degree of effluent treatment in order for these standards to be respected. (AU) | |