An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil

Souza, Jonas Otaviano Praça de; Corrêa, Antônio Carlos de Barros; Brierley, Gary

doi:10.1016/j.catena.2015.11.006

Cited by 41 publications

(23 citation statements)

References 54 publications

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“…As in most semi-arid and arid regions, which cover over 40% of the world's land surface, water resource management in the Middle East and North Africa is more complex than it is in humid zones due to the lack of perennial rivers and other readily available water sources [1]. The population of the Middle East and North Africa was 432 million in 2007, and is projected to reach nearly 700 million by 2050 [2].…”

Section: Introductionmentioning

confidence: 99%

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Zettam

Taleb

Sauvage

et al. 2017

Water

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Sediment deposits in North African catchments contribute to around 2%-5% of the yearly loss in the water storage capacity of dams. Despite its semi-arid climate, the Tafna River plays an important role in Algeria's water self-sufficiency. There is continuous pressure on the Tafna's dams to respond to the demand for water. The Soil and Water Assessment Tool (SWAT) was used to evaluate the contribution of different compartments in the basin to surface water and the dams' impact on water and sediment storage and its flux to the sea in order to develop reservoir management. The hydrological modelling fitted well with the observed data (Nash varying between 0.42 and 0.75 and R 2 varying between 0.25 and 0.84). A large proportion of the surface water came from surface runoff (59%) and lateral flow (40%), while the contribution of groundwater was insignificant (1%). SWAT was used to predict sediments in all the gauging stations. Tafna River carries an average annual quantity of 2942 t·yr −1 to the Mediterranean Sea. A large amount of water was stored in reservoirs (49%), which affected the irrigated agricultural zone downstream of the basin. As the dams contain a large amount of sediment, in excess of 27,000 t·yr −1 (90% of the sediment transported by Tafna), storage of sediment reduces the lifetime of reservoirs.

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Section: Introductionmentioning

confidence: 99%

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Zettam

Taleb

Sauvage

et al. 2017

Water

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“…Structural and functional connectivity are tightly interwoven. Many studies focus on how the spatial template created by structural configuration interacts with variations in available energy to drive spatial and temporal fluctuations in functional connectivity (Jencso et al, 2009(Jencso et al, , 2010Jensco and McGlynn, 2011;Souza et al, 2016;Wohl et al, 2017b). Croke et al (2013) and Thompson et al (2016), for example, use longitudinal variations in valley-bottom configuration and the measured and modeled extent of floodplain inundation during an extreme flood to infer connectivity between channel and floodplain.…”

Section: Definition Referencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Connectivity as an emergent property of geomorphic systems

Wohl

Brierley

Cadol

et al. 2018

Earth Surf Processes Landf

281

195

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Connectivity describes the efficiency of material transfer between geomorphic system components such as hillslopes and rivers or longitudinal segments within a river network. Representations of geomorphic systems as networks should recognize that the compartments, links, and nodes exhibit connectivity at differing scales. The historical underpinnings of connectivity in geomorphology involve management of geomorphic systems and observations linking surface processes to landform dynamics. Current work in geomorphic connectivity emphasizes hydrological, sediment, or landscape connectivity. Signatures of connectivity can be detected using diverse indicators that vary from contemporary processes to stratigraphic records or a spatial metric such as sediment yield that encompasses geomorphic processes operating over diverse time and space scales. One approach to measuring connectivity is to determine the fundamental temporal and spatial scales for the phenomenon of interest and to make measurements at a sufficiently large multiple of the fundamental scales to capture reliably a representative sample. Another approach seeks to characterize how connectivity varies with scale, by applying the same metric over a wide range of scales or using statistical measures that characterize the frequency distributions of connectivity across scales. Identifying and measuring connectivity is useful in basic and applied geomorphic research and we explore the implications of connectivity for river management. Common themes and ideas that merit further research include; increased understanding of the importance of capturing landscape heterogeneity and connectivity patterns; the potential to use graph and network theory metrics in analyzing connectivity; the need to understand which metrics best represent the physical system and its connectivity pathways, and to apply these metrics to the validation of numerical models; and the need to recognize the importance of low levels of connectivity in some situations. We emphasize the value in evaluating boundaries between components of geomorphic systems as transition zones and examining the fluxes across them to understand landscape functioning. © 2018 John Wiley & Sons, Ltd.

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“…Esta análise vai ao encontro de outras avaliações de conectividade realizadas em ambientes secos do Nordeste brasileiro. A predominância das baixas conectividades nas encostas em ambientes pedimentares são características do semiárido nordestino, havendo a possibilidade de aumento quando muda o uso da terra, especialmente com a remoção da vegetação e a expansão do uso agrícola Pinheiro, 2013;Brierley, 2016;Santos et al, 2017). Bem como, a variação da conectividade nas áreas de contato com as áreas elevadas do Planalto da Borborema, na qual as áreas de escarpa da transição pedimento/topo apresentam conectividade muito alta, com a ocorrência de afloramentos rochosos e solos rasos, e as áreas de topo plano apresentam conectividade muito baixa, com a presença de solos profundos mais desenvolvidos e maior potencial agrícola Brierley, 2016).…”

Section: Figura 4 -Mapa De Cobertura Da Terraunclassified

“…Outro resultado representativo é a identificação da predominância de baixa conectividade na rede de drenagem semiárida, caracterizada pelo domínio de canais com leitos arenosos e pouco entalhados Corrêa, 2012b;Barros et al, 2014;. Para uma pesquisa mais aprofundada ressalta-se a importância da inclusão de outras estruturas antrópicas, não apenas áreas urbanas e estradas, tais como barramentos Corrêa, 2012a;Brierley, 2016) e passagens molhadas (Cavalcante et al, 2014). A inclusão de interferências antrópicas na análise é importante para analisar a (des)conectividade do ambiente fluvial nos trechos de intervenção.…”

Section: Figura 4 -Mapa De Cobertura Da Terraunclassified

Conectividade de sedimentos na Bacia Hidrográfica Riacho do Tigre, ambiente semiárido no município de São João do Tigre-PB

Franco

Souza

2019

GEOUSP (Online)

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O presente artigo visa analisar a conectividade da paisagem da Bacia Hidrográfica do Riacho do Tigre, a partir de uma análise quantitativa de índice de conectividade de sedimentos. A bacia está localizada no município de São João do Tigre-PB e está posta em um ambiente semiárido, apresentando apenas riachos intermitentes e efêmeros. O índice de conectividade utiliza informações topográficas, hidrológicas e de uso da terra para identificar o potencial de conectividade de sedimento. Portanto, as porções mais centrais, ao norte e nordeste da bacia apresentam conectividade entre intermediária, baixa e muito baixa. Nas bordas da bacia, em especial na porção sudeste, encontram-se os índices de conectividade mais elevados, cujas áreas apresentam maiores declividades e elevadas altitudes, corroborando para uma maior produção de sedimentos. Por fim, é importante compreender que alguns aspectos controlam o índice de conectividade, como por exemplo, o uso e ocupação da terra, a declividade e a altitude.

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An approach to assess the impact of landscape connectivity and effective catchment area upon bedload sediment flux in Saco Creek Watershed, Semiarid Brazil

Cited by 41 publications

References 54 publications

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Modelling Hydrology and Sediment Transport in a Semi-Arid and Anthropized Catchment Using the SWAT Model: The Case of the Tafna River (Northwest Algeria)

Connectivity as an emergent property of geomorphic systems

Conectividade de sedimentos na Bacia Hidrográfica Riacho do Tigre, ambiente semiárido no município de São João do Tigre-PB

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