Banca de QUALIFICAÇÃO: JOÃO VIEIRA DE MORAIS NETO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JOÃO VIEIRA DE MORAIS NETO
DATA : 05/05/2017
HORA: 14:00
LOCAL: Auditório do CCEA - CTEC/UFRN
TÍTULO:

EFFECT OF LAND USE IN THE WATER QUALITY OF BRAZILIAN SEMIARID RESERVOIRS

PALAVRAS-CHAVES:

Land use. Watershed. Geoprocessing.

PÁGINAS: 16
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Sanitária
RESUMO:

The replacement of native vegetation by anthropic activities in a drainage basin generally results in the transport of nutrients to aquatic ecosystems, reducing the water quality of these environments. The semiarid region of the Brazilian Northeast does not escape this rule and because it has young soils, it is even more susceptible to erosion, which can exacerbate the problem. Finding the most important variables in this is of paramount importance for the management of the basins, since it can generate public policies of protection to the water sources. The objective of this study was to verify the relationship between the land use of the drainage basin and the water quality variables of 38 reservoirs inserted in the Piranhas-Açu and Apodi-Mossoró river basins in the Brazilian semi-arid region (Rio Grande do Norte - RN ). The delimitation of the drainage basins, as well as the analyzes of land use and occupation were carried out using geoprocessing tools such as Taudem and SCP applied in the Quantum Gis software, classifying uses in: dense vegetation, sparse vegetation, exposed soil, urban, Agriculture and water. The water quality data were obtained from a state water monitoring program and the selected variables were: total phosphorus, total nitrogen, thermotolerant coliforms, total solids, density of cyanobacteria and chlorophyll. To date, seven drainage basins (out of 38 intended) have been analyzed and correlation analyzes between water quality and soil use have been performed for the year 2009. Significant negative correlations were found between dense vegetation and total phosphorus (r= -0.96, p= 0.00), with cyanobacteria density of the reservoirs, and r = -0.83 and p = 0.04. Another result to be highlighted was the positive correlation (r= 0.82, p = 0.04) between cyanobacteria density and the agricultural activity in the drainage basin. Therefore, these results show that the reduction of native vegetation percentage and increased agricultural activity tend to worsen water quality and increase the density of cyanobacteria in the reservoirs.

MEMBROS DA BANCA:
Interno - 052.716.174-83 - FABIANA OLIVEIRA DE ARAUJO SILVA - UFRN
Externo ao Programa - 1066308 - MARCUS ALEXANDRE NUNES
Presidente - 1177742 - RONALDO ANGELINI