Banca de DEFESA: AUGUSTO CÉSAR CAVALCANTI GOMES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : AUGUSTO CÉSAR CAVALCANTI GOMES
DATE: 21/05/2024
TIME: 08:30
LOCAL: Auditório da Engenharia Ambiental - CTEC - sala 212 - UFRN e https://meet.google.com/idi-sorf-bwo
TITLE:

IMPACTS ON WATER QUALITY RESULTING FROM THE ANTHTOPIZATION OF THE RIPARIAN ZONE IN RESERVOIRS IN THE BRAZILIAN TROPICAL SEMI-ARID REGION

KEY WORDS:

White forest; eutrophication; geographic information system; land use and occupation; riparian forest

PAGES: 55
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
SUMMARY:

The effects of human alteration of the terrestrial ecosystem impact aquatic ecosystems that receive nutrients from the watershed through surface soil processes. The application of geoprocessing can be a valuable tool for the sustainable management of these ecosystems, assisting in decision-making regarding measures to protect riparian zones and the aquatic ecosystem. The objective of our work was to evaluate the influence of land use in the riparian zone on the water quality of reservoirs in the tropical semi-arid region. The reservoirs were divided into groups – large and medium – according to the maximum water volume (greater or less than 75 hm³). Our hypothesis was that large reservoirs have larger anthropized areas due to the extent of riparian zones, but the consequences on water quality are delayed due to the dilution effect of their larger stored water volume. Whereas medium reservoirs have a more immediate response in eutrophication intensification, since their storage volume is smaller and they become more vulnerable to the climatic effects of the tropical semi-arid region. The study was conducted in 17 reservoirs in the tropical semi-arid region, located in the watersheds of Apodi-Mossoró (RN), Piancó-Piranhas-Açú (RN/PB), and Paraíba River (PB), in northeastern Brazil. Analyses of land use in the riparian zone were performed within a buffer of 100 meters from the edge of each reservoir, through geoprocessing analysis. The categories of land use used were: riparian woodland; dense caatinga; sparse caatinga; bare soil; and urban. The riparian zones of the reservoirs showed a high rate of anthropization due to the occupation of agricultural/pasture areas, bare soil, and urban. The effects of anthropization on water quality received contributions from limnological variables of suspended solids, carbon fractions, chlorophyll-a, and total phosphorus. The suppression of native vegetation may minimize the buffering effect that soils and vegetation exert on the riparian zone. The dense vegetation of the caatinga presented remnants and may not be sufficient to protect against the influx of diffuse pollution to the reservoirs. These reservoirs showed sparse caatinga vegetation in the drainage area, which promotes a greater influx of nutrients when flooded.

COMMITTEE MEMBERS:
Interna - 2412921 - JULIANA DEO DIAS
Externo à Instituição - JULIANA DOS SANTOS SEVERIANO
Interno - 1177742 - RONALDO ANGELINI
Presidente - 1764855 - VANESSA BECKER