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Previous issue date: 2009-09-11 / Urban growth of metropolitan areas has produced impacts of considerable importance on environment and water resources. Such impacts are in general associated with human activities, such as basin area uncontrolled development. In this context, Pitimbu river watershed, located at Natal metropolitan area, has been affected by uncontrolled development caused by urban expansion. Indeed, such effects have been reflected on water quantity and quality, which may produce social consequences. Pitimbu river is an important water supplier for human consumption, actually supplying a 2600 m3/h water discharge. This study aims to analyze the qualitative and quantitative aspects of water and sediment on Pitimbu river lowland portion. For this purpose, physical-chemical water properties were analyzed, and sediment macro invertebrates benthonic were monitored in two cross sections in a period between November 8th, 2007 and October 3rd, 2008. Monitoring methodology consisted of water and sediment sampling for laboratory analysis. Water quality analysis included Dissolved Oxygen, Oxygen Biochemical Demand, Nitrate, pH and Alkalinity, Suspended and Total Solids. The analysis of heavy metals in the sediment included Cadmium, Cobalt, Copper, Chrome, Silver and Nickel. Dry season water discharge data were measured and used to adjust recession function parameters, whose values reveal quick recession and strong river-aquifer unconfined interaction. Water quality analysis revealed the absence of degradation by organic composites. However, DO and BOD levels indicate that more consistent results could be provided if sampling time interval were reduced. Biomonitoring showed signs of aquatic ecosystem degradation by the absence of sensitive and abundance of resistant benthic organisms. Obtained results demonstrate the urgent need of effective management measures to provide environmental protection. The increase of environmental degradation will certainly make impracticable the use of water for human consumption / A expans?o urbana das regi?es metropolitanas tem produzido impactos negativos de grande import?ncia no meio ambiente e nos recursos h?dricos. Esses impactos est?o relacionados com as atividades antr?picas na bacia hidrogr?fica, refletidas no descontrole do uso e ocupa??o do solo. Nesse contexto, a Bacia Hidrogr?fica do rio Pitimbu, situada na regi?o metropolitana de Natal, tem sido objeto de ocupa??o desordenada, motivada pela expans?o urbana. Os efeitos dessa ocupa??o tem se refletido na qualidade e quantidade da ?gua desse rio, com conseq??ncias sociais importantes. O rio Pitimbu ? manancial de abastecimento, suprindo atualmente uma vaz?o de 2600 m3/h. Este estudo tem como objetivo analisar aspectos quali-quantitativos da ?gua e do sedimento no baixo curso do rio Pitimbu. Para isso, foram realizadas an?lises f?sico-qu?micas da ?gua e biomonitoramento envolvendo macro-invertebrados bent?nicos em duas se??es transversais no per?odo de 8/11/2007 a 3/10/2008. O monitoramento consistiu na coleta de amostras da ?gua e do sedimento fluvial e posterior analise em laborat?rio. Foram analisados Oxig?nio Dissolvido, Demanda Bioqu?mica de Oxig?nio, Nitrato, pH, Alcalinidade, S?lidos Suspensos e Totais, al?m dos teores de C?dmio, Cobalto, Cobre, Cromo, Prata e N?quel. O monitoramento da descarga l?quida no per?odo seco permitiu o ajuste dos par?metros da fun??o de recess?o, demonstrando recess?o r?pida com forte intera??o rio-aqu?fero n?o confinado. A an?lise da qualidade da ?gua revelou aus?ncia de degrada??o por subst?ncias org?nicas. Apesar disso, os n?veis de OD e DBO indicam que resultados mais conclusivos poderiam ser obtidos se o intervalo entre coletas fosse reduzido. O biomonitoramento revelou sinais de degrada??o do ecossistema aqu?tico pela aus?ncia de bent?nicos sens?veis e abund?ncia de resistentes. Os resultados obtidos demonstram a necessidade de que sejam adotadas medidas eficientes de gerenciamento que resultem na prote??o ambiental na bacia. O aumento do n?vel de degrada??o inviabilizar? o uso da ?gua para consumo humano no futuro
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15962 |
| Date | 11 September 2009 |
| Creators | Kobayashi, Rafael Takeshi |
| Contributors | CPF:37994476449, http://lattes.cnpq.br/4599100661657180, Ara?jo, Andr? Luis Calado, CPF:37695045268, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799320A6, Andrade, Herbet Tadeu de Almeida, CPF:24322253415, http://lattes.cnpq.br/0984577704595246, Silans, Alain Marie Bernard Passerat de, CPF:35981199768, http://lattes.cnpq.br/2325213960197622, Moreira, L?cio Fl?vio Ferreira |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-gradua??o em Engenharia Sanit?ria, UFRN, BR, Saneamento Ambiental; Meio Ambiente; Recursos H?dricos e Hidr?ulica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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