@Article{AlvesRossVale:2020:DeNeLo,
author = "Alves, F{\'a}bio Corr{\^e}a and Rossetti, Dilce de F{\'a}tima
and Valeriano, M{\'a}rcio de Morisson",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Detecting neotectonics in the lowlands of Amazonia through the
analysis of river long profiles",
journal = "Journal of the South American Earth Sciences",
year = "2020",
volume = "100",
pages = "e102553",
month = "June",
keywords = "Digital elevation model, Remote sensing, Transient landscape,
Normalized steepness index, Knickpoint.",
abstract = "There has been a considerable number of studies focusing on the
analysis of river long profiles based on stream power incision
models aiming to detect areas affected by neotectonics. Most of
these studies have successfully uncovered active tectonics in
mountainous landscapes, with some examples in areas of low reliefs
around the globe. However, this kind of investigation has rarely
been used in large tropical lowlands, such as the Amazonian
lowlands, where the application of river long profiles is still
challenging. The main aim of the present work was to test the
functionality of methods based on river profiles to detect
neotectonic reliefs in lowland landscapes. The Negro River basin
was selected for this investigation, assuming the several
indications of tectonic activity during the late Pleistocene and
Holocene. We tested the normalized channel steepness index
(k(sn)), with the identification of knickpoints and interpretation
of swath profiles, computed from the 30 m digital elevation model
provided by the Shuttle Radar Topography Mission. The results
showed streams with profiles bounded by a set of knickpoints
represented by very low k(sn) values in the right (average k(sn) =
8) and left (average k(sn) = 10) margins of the Negro River. These
values contrast with the high range of k(sn) values generally
found for rivers of tectonically active mountainous landscapes.
Even with low values, we verified that a slight increase in k(sn)
values was enough to detect transient rivers related with strike
slip faults in Amazonia lowlands. The swath profiles also showed
sectors on relief compatible with changes in the base level of the
tributaries, with the record of knickpoints and an increase in
k(sn) values. The experimental results obtained in this work
motivate further quantitative investigation in Amazonian lowlands
by testing geological data with new robust techniques from river
profiles.",
doi = "10.1016/j.jsames.2020.102553",
url = "http://dx.doi.org/10.1016/j.jsames.2020.102553",
issn = "0895-9811",
language = "en",
targetfile = "alves_detecting.pdf",
urlaccessdate = "12 maio 2024"
}