Journal of Food, Agriculture and Environment

Trophic State Index (TSI) applied in the assessment of anthropic impacts on the surface water of a watershed

Author(s):

Adir Otto Schmidt *, Sílvio Cesar Sampaio, Ralpho Rinaldo dos Reis, Camila Jussara Schmidt, Edison Barbosa da Cunha, Lisdefferson Hamann Andrade

Recieved Date: 2014-07-18, Accepted Date: 2014-09-28

Abstract:

The consolidation of the urbanization process in the cities and the intensification of agriculture and breeding in rural areas have caused impacts on water resources, particularly the eutrophication of rivers. In order to contribute to the monitoring and preservation of water quality, this study aimed to employ the Trophic State Index (TSI) to assess impacts of human actions on the surface water of a watershed of São Francisco Verdadeiro river. In the period from 2011 to 2013, 52 monitoring campaigns were performed at intervals of 15 days. Water samples were collected from nine strategic locations of the watershed and from a control location. The collection sites were defined by taking into account the possibility of different impacts from each activity developed along the watershed. Discharge readings and analyses of total phosphorus and chlorophyll-a concentrations were performed in order to calculate the TSI. Based on the results obtained, the trophic classification was mesotrophic in six locations, and eutrophic, supereutrophic and hypereutrophic in one location each. It was concluded that different forms of use and occupation cause impact on the eutrophication process, which varied in space and time. The highest concentrations of total phosphorus for sites with influence of urban activities occurred during periods of low discharge, whereas for places with influence of agricultural activities they occurred in high discharge events. Sites with influence of urban activities presented higher trophic classification than those influenced by agricultural activities. TSI, TSI(Chl), and TSI(TP) classifications may vary for a same location, depending on environmental conditions and activities developed on site.

Keywords:

Water pollution, eutrophication, monitoring of water quality

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Environment
Pages: 400-404

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