Open AccessSediment input from the São Francisco River bank, Northeast Brazil, under low discharge period
Author(s) -
Francisco Sandro Rodrigues Holanda,
Maria Hosana dos Santos,
Janisson Batista de Jesus,
Wadson de Menezes Santos,
Edinaldo de Oliveira Alves Sena,
Thiago Xavier Chagas,
João Goes,
Luiz Diego Vidal Santos
Publication year - 2021
Publication title -
investigaciones geográficas/investigaciones geográficas - instituto de geografía. universidad nacional autónoma de méxico
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.17
H-Index - 14
eISSN - 2448-7279
pISSN - 0188-4611
DOI - 10.14350/rig.60244
Subject(s) - thalweg , transect , sediment , hydrology (agriculture) , geology , channel (broadcasting) , erosion , riprap , bank , geomorphology , geotechnical engineering , oceanography , engineering , electrical engineering
The objective of this study was to evaluate the input of suspended sediment from the slope toe in the São Francisco River channel, in Northeast Brazil, under different soil bioengineering techniques. Sediments were collected in the years of 2013, 2014 and 2015, in five transects crossing the river channel. Sediment input in the sampling points was higher in the year of 2013, i.e., the year of the highest river discharge. Sediment supply to the river channel for a period of 3 years (2013, 2014 and 2015), was evaluated at 20, 40 and 60% depth, along five different transects (P1= riverbank, P2= beginning of the thalweg, P3= middle of the thalweg, P4= end of the thalweg, and P5 = margin of the side sandybar), oriented by the presence or absence of erosion control techniques (treatments) such as: 1-Natural Vegetated Slope; 2-Vegetated Riprap; 3-Eroded Slope; 4-Live Cribwall and 5-Vetiver grass Contour Line. Sediments input was different in all evaluated transects, and the one identified as Eroded Slope at 20% depth presented the lowest amount of suspended sediment load. There was a decrease in the total amount of suspended sediment in the evaluated periods, probably due to the progressive decrease in the river discharge, and the protection provided by the soil bioengineering techniques.