Banca de QUALIFICAÇÃO: WILLIAN ANDERSON FERREIRA TOMAZ

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : WILLIAN ANDERSON FERREIRA TOMAZ
DATE: 17/04/2026
TIME: 08:00
LOCAL: Sala de aula do Laboratório de Recursos Hídricos e Saneamento Ambiental (LARHISA)
TITLE:

NUTRIENT LOADS AND TROPHIC SATE OF AN URBAN SHALLOW LAKE IN THE METROPOLITAN REGION OF NATAL, RN

KEY WORDS:

Rio Pitimbu, Mass balance, Water Quality, Water Polution

PAGES: 28
BIG AREA: Engenharias
AREA: Engenharia Sanitária
SUBÁREA: Saneamento Ambiental
SPECIALTY: Ecologia Aplicada a Engenharia Sanitária
SUMMARY:

Eutrophication of urban water sources represents a challenge for water security and the maintenance of ecosystem services. This study analyzed the temporal variation of nutrient loads and the trophic state of the Jiqui Lake, an important water supply source for the Metropolitan Region of Natal. Between May and September 2025, weekly monitoring of total phosphorus (TP), total organic carbon (TOC), and chlorophyll-a (Chl-a) concentrations was carried out. The average external loads of TP and TOC were 52.9 mg/s and 4.4 g/s, respectively, with high variability (CV = 124.7% and 69.7%), this variation being mainly determined by variation in concentrations, and not by variation in flow rates. The lake acted predominantly as a nutrient sink, with an average retention of 27.4 mg/s (TP) and 1.2 g/s (TOC), which corresponds to 52% and 27% of the average external load of TP and TOC, respectively. The concentrations of PT and Chl-a in the lake water indicate a mesotrophic condition. However, because it is a shallow system dominated by aquatic macrophytes, the lake can maintain clear water even under high nutrient loads, limiting the isolated application of these indicators. Thus, the inclusion of macrophyte dynamics in the monitoring is recommended for a better assessment of the trophic state. It should be noted that the study did not encompass a complete hydrological cycle, and long-term monitoring is necessary.

COMMITTEE MEMBERS:
Presidente - 1362202 - JOSE LUIZ DE ATTAYDE
Interna - 1759777 - ADELENA GONCALVES MAIA
Interna - 2190974 - JOANA DARC FREIRE DE MEDEIROS