Sediment Yield in Different Scales in a Semiarid Basin the Case of the Jaguaribe river, Brazil

Araújo, José Carlos de; Pinheiro, Everton Alves Rodrigues; Figueiredo, José Vidal de; Bronstert, Axel

doi:10.1201/9781315120584-19

Cited by 8 publications

(2 citation statements)

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“…To show the relevance of intensive rainfall events for the sediment dynamics in the region : only 3 days of events in the middle of February 2019 accumulated 8% of totalperiod precipitation and 16% of total erosivity. de Araújo, Pinheiro, Medeiros, de Figueiredo, and Bronstert (2018) monitored a 68 m 2 hillslope in the semiarid Aiuaba Experimental Basin for 4 years and concluded that gross erosion there was 2 Mg ha −1 yr −1 , the same value measured by dos Santos et al (2017) in a hilly 1-ha area also in North-east Brazil. Medeiros, de Araújo, and Andrello (2014) used Caesium-137 to measure long-term gross erosion in a preserved 24-ha hillslope in the same region and concluded that it was 1 Mg ha −1 yr −1 .…”

Section: Measurements At the Hillslope Scalementioning

confidence: 71%

Erosion at hillslope and micro‐basin scales in the Gilbués desertification region, Northeastern Brazil

et al. 2020

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With an area of 6,200 km2, the Gilbués badlands region in the Brazilian drylands is the largest desertification site in the Country. It is located upstream the Boa Esperança Hydroelectric Power Plant and is contiguous to an important Brazilian agricultural area. However, primary quantitative data on erosive processes are scarce or nonexistent. We analyzed on‐site data (2018–2019) concerning small‐scale (hillslope and micro basin) processes: inter‐rill gross erosion, vegetation coverage factor, sediment yield, and sediment delivery ratio. We measured gross erosion in four hillslopes using metal pins; rainfall erosivity using an automatic meteorological station; soil erodibility; and siltation of five check‐dams that control micro basins (101–103 m2) by means of an unmanned aerial vehicle. Gross erosion (102 Mg ha−1 yr−1; 7.5 mm yr−1) is up to 100‐fold the regional mean value and up to 45‐times the tolerable soil‐loss reference value (0.17 mm yr−1), showing that degradation still evolves. Sparse small vegetation directly exposes two thirds of the soil, with a high vegetation factor (0.90). The sediment delivery ratio of the micro basins is 0.88, compatible with low (12%) sediment‐deposition pattern at this scale. The Maner delivery‐ratio model mimicked field observation, which indicates that relief is the key element influencing sediment deposition there. The check‐dam effectiveness considerably decreased after the first decade of operation due to high siltation rates. Although the Gilbués badland occupies only 5% of the basin upstream of the power plant, it contributes 32% of the sediment load to reservoir and dam. This shows the relevance of the badland restoration for the regional sustainability of water and energy supply.

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Section: Measurements At the Hillslope Scalementioning

confidence: 71%

Erosion at hillslope and micro‐basin scales in the Gilbués desertification region, Northeastern Brazil

et al. 2020

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“…From the daily data for the level of the Benguê Reservoir (2004 to 2020) and knowing: (i) the morphology of the reservoir, (ii) the rates of evaporation (measured in a class A pan at the AEB, therefore, in the basin itself), (iii) the derived fl ow of the reservoir, and (iv) the spill, we can estimate the fl ow added to the reservoir by the river. In the Aroeira Basin, the fl ow is measured directly in the control section (coinciding with the outlet) using its rating curve (ARAÚJO et al, 2017). The measurements were carried out from 2011 to 2020, with eventual breaks during 2013, 2014 and 2017.…”

Section: Measuring Intermittence and Accumulated Volume Dynamics In T...mentioning

confidence: 99%

Modelling intermittence and river fl ow in the semi-arid region of Brazil: The Umbuzeiro River, Ceará

Lima¹,

Lima²,

Soares³

et al. 2022

RCA

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Research shows an increase in the intermittence of rivers of different spatial scales. Exploring intermittence in semi-arid regions, also characterised by a scarcity of data, is important for understanding the process on a global scale. The aim of this study, therefore, was to evaluate the ability of a physically based hydrological model (WASA) to simulate simultaneously the intermittence and fl ow of the Umbuzeiro River, whose basin is located in Aiuaba, Ceará. The analysis was carried out in three nested basins: the Benguê Reservoir (933 km 2 ), the Aroeira Reservoir (800 km 2 ) and the Aiuaba Experimental Basin (AEB, 12 km 2 ). Eleven simulations were carried out, altering various parameters (saturated hydraulic conductivity of the soil on the slopes and on the riverbed, hydraulic conductivity of the crystalline basement, depth of the riverbed, and the rainfall intensity parameter of the model). The model better represented the larger basins (10³ km 2 ) compared to the smaller scale basin (10¹ km 2 ). The simulations showed a marked improvement once the hydraulic conductivity of the soils as measured in situ had been applied, confi rming the physical basis of the model. The most sensitive parameter for the generation of fl ow was the saturated hydraulic conductivity of the soil. This can be explained by the prevalence of Hortonian fl ow in the basin. It was concluded that none of the parameterisations was successful in simultaneously representing the two processes (intermittence and fl ow) on the scales of the three basins.

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Sediment yield in a basin in Brazilian Semiarid Regions: A discussion on positive allometry

Rabelo

Cavalcante²,

Araújo³

2023

CATENA

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Sediment Yield in Different Scales in a Semiarid Basin the Case of the Jaguaribe river, Brazil

Cited by 8 publications

References 1 publication

Erosion at hillslope and micro‐basin scales in the Gilbués desertification region, Northeastern Brazil

Erosion at hillslope and micro‐basin scales in the Gilbués desertification region, Northeastern Brazil

Modelling intermittence and river fl ow in the semi-arid region of Brazil: The Umbuzeiro River, Ceará

Sediment yield in a basin in Brazilian Semiarid Regions: A discussion on positive allometry

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