English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The successive events of erosion, transport and deposition of sediments that occur in rivers provide the formation and evolution of morphological features in the channel and in the fl oodplain, with morphological features recurring to the region where it is inserted. Although there are studies of rivers located in the semi-arid climate, with an interlaced and anabranching pattern, mainly in Australia, there is a methodological shortage for Brazilian semi-arid rivers. The academic production on bars and islands is concentrated in fl uvial environments located in tropical, subtropical and temperate climate, based on this context, the work aims to analyze the morphological characteristics of bars and islands in the river Jaguaribe-CE, a stretch that goes from the Passagem molhada of the Barragem das Pedrinhas in the municipality of Limoeiro do Norte to the wet passage of Sucurujuba in Quixeré, with time cut 2001 to 2016 (16 years). For that, the work was structured from a systemic logic, with stages of characterization of the study area; fi eld work for photographic survey and sediment collection; laboratory stage for granulometric analysis through mechanical sieving and pipetting processes; and cabinet stage for rain and fl ow data collection and remote sensing and geoprocessing. The results obtained through the analysis of the orbital images showed that the main evolutionary changes regarding the growth of the area observed took place between 2014 and 2016, a period corresponding to the prolonged drought in Ceará, which began in 2012. It was found that the wider islands have a tendency to have upper lateral sedimentation, due to the fl ow barring that the deposit itself makes. Regarding the side bars, it was observed that their genesis is the result of distinct processes, recorded in rainy periods such as 2009, causing the redistribution of sediment particles throughout the bed, and in dry years such as 2016, by exposure of previously submerged sandy banks that were part of the wet bed. The plain bars, in their totality, showed sand growth in 100% of the deposits, due to their resistance to erosive processes. Besides, it was considered necessary the adoption of terminological classifi cations based on morphological characteristics for semi-arid climates, since the misinterpretation of terms can alter the results of the research. Caracterização de Feições Morfológicas no Canal do Rio Jaguaribe: Trecho Limoeiro do Norte-Quixeré Para além da infl uência climática, o rio Jaguaribe, objeto de estudo da pesquisa, é referência no processo de perenização de rios semiáridos pela construção de açudes (Orós e Castanhão) e passagens molhadas. Tais estruturas podem também impactar na criação e evolução dos depósitos sedimentares, uma vez que controlam e/ou alteram fl uxo do rio. O estudo das barras e ilhas, numa perceptiva temporal, pode permitir a compreensão do comportamento sedimentar dos rios semiárido, uma vez que as feições funcionam como “demarcações” históricas das mudanças de curso entre períodos secos e chuvosos, além de permitir a previsão de cenários futuros, para prevenção de impactos negativos no canal. Baseado nessa discussão, o trabalho tem como objetivo geral analisar as características morfológicas de barras e ilhas no Rio Jaguaribe, no seu baixo curso, precisamente no trecho que vai da barragem das Pedrinhas, em Limoeiro do Norte, até a passagem molhada de Sucurujuba, em Quixeré. Dentre os objetivos específi cos destacam-se: identifi car e mapear as feições morfológicas no trecho em estudo; verifi car as mudanças ocorridas nas barras e ilhas referentes à morfologia, localização e capacidade de fi xação; correlacionar às alterações observadas nas feições morfológicas com os fatores naturais e antrópicos; contribuir com os estudos de dinâmica fl uvial em regiões semiáridas.

CARACTERIZAÇÃO DE FEIÇÕES MORFOLÓGICAS NO CANAL DO RIO JAGUARIBE: TRECHO LIMOEIRO DO NORTE-QUIXERÉ