Name: ALANDERSON GOMES DE SOUZA
Type: MSc dissertation
Publication date: 08/03/2022
Advisor:
Name |
Role |
|---|---|
| EBERVAL MARCHIORO | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| ANDRE LUIZ NASCENTES COELHO | Internal Examiner * |
| DIOGO COSTA BUARQUE | External Examiner * |
| EBERVAL MARCHIORO | Advisor * |
Summary: Understanding the hydro-sedimentological dynamics of a watershed is fundamental in
decision-making and in a management planning for the rational use of natural
resources. As a result, this work aims to analyze the hydro-sedimentology of the Pau
Amarelo stream watershed in an intramontane tropical environment. To this end,
between February 2017 and July 2019, monitoring of flow, water level, precipitation
and concentration of suspended sediments was carried out. From this data collection,
statistical analysis was performed between different parameters and daily calculations
of flow and sediment yield through rating curves. The accumulated rainfall recorded
was close to the normal rainfall in 2017 and above in 2018. The average flow monitored
was 0.216 m³.s-1
. The concentration of suspended sediments observed ranged from
0.14 mg.L
-1
to 11.80 mg.L
-1
. The results showed that the average velocity is the main
factor of variation of the results in the flow, corresponding on average to 61% of the
entire average, for width and depth values close to 20%. It was verified through the
flow duration curve that the Q90, in the study period, was 0.034 m³.s-1
. The analysis of
the relationship between rainfall and flow indicates that the flow does not present a
direct response to rainfall, especially in low-magnitude rainfall, with other factors that
regulate the flow, such as the duration of the event and the interception carried out by
the forest. The sediment rating curve that best represented the dataset was the one
constructed by dividing it into three sections separated by the flow. The observed and
estimated data on the concentration and suspended sediment yield show that the use
and land cover of the Atlantic Forest worked as a positive factor in reducing the
suspended sediments yield, even in the face of a strongly dissected relief, with
accentuated slopes and soils susceptible to erosion.
