Impedance influence on the index of sediment connectivity in a forested mountainous catchment

Zanandrea, Franciele; Michel, Gean Paulo; Kobiyama, Masato

doi:10.1016/j.geomorph.2019.106962

Cited by 42 publications

(24 citation statements)

References 27 publications

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“…To evaluate the effects of W HR dynamics on hydrosedimentary connectivity, we also computed IC using uniform impedance ( W 1 ; Zanandrea et al, 2020) and topography‐based impedance ( W RI ; Cavalli et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Considering the above, the necessity to use the most appropriate W emerges as a key issue when considering local characteristics of the studied catchment to assess IC. For instance, while a topography‐based W is likely to better represent impedance in bare alpine slopes (Cavalli et al, 2013), a land‐cover–based W is more appropriate in vegetated catchments (Persichillo et al, 2018; Schopper, Mergili, Frigerio, Cavalli, & Poeppl, 2019; Zanandrea et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Impedance is controlled by different factors related to local characteristics of the catchment, such as topography and land use. Using the appropriate W then represents the most challenging part of IC computation (Borselli et al, 2008; Cavalli et al, 2013; Zanandrea, Michel, & Kobiyama, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Interannual evolution of hydrosedimentary connectivity induced by forest cover change in a snow‐dominated mountainous catchment

2021

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Hydrosedimentary connectivity is a key concept referring to the potential fluxes of water and sediment moving throughout a catchment. In forested catchments, these fluxes are prone to alterations caused by anthropogenic and natural disturbances. In this study, we modelled the interannual spatiotemporal evolution of hydrosedimentary connectivity influenced by forest cover change over the last four decades in the Mont‐Louis catchment, a medium snow‐dominated mountainous catchment in eastern Canada, which had 62% of its total surface affected by forest disturbances (mainly logging, but also wildfires and diseases) between 1979 and 2017. Using a geomorphometric index of connectivity (IC) and a historical forest cover database, we produced one IC map per year that considered anthropogenic and natural disturbances affecting the forest cover of the studied catchment. To account for vegetation recovery, forest disturbances were weighted with local hydrological recovery rates. Over the four decades, the mean IC of the Mont‐Louis catchment dramatically increased by 35% in response to different types of disturbances. The spatial evolution of IC over the whole catchment and at the sub‐catchment scale revealed that disturbance location has a strong influence on hydrosedimentary connectivity to the main channel. Our results also highlight the sharp contrast between IC computed from topography‐based impedance to those computed from vegetation‐based impedance. Forest disturbances appear to connect hillslopes with the hydrological network by producing pathways for sediment and water. Finally, the proposed reproducible framework could be useful for predicting the potential impact of harvesting and preventing damage to fish habitat and sensitive river reaches.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interannual evolution of hydrosedimentary connectivity induced by forest cover change in a snow‐dominated mountainous catchment

2021

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“…Assim, valores de W próximos de 1 acabam não exercendo efetiva ponderação no cálculo de IC, não sendo efetivos em representar a impedância, principalmente em áreas fl orestadas, além desta proposição trazer dimensionalidade ao IC, antes adimensional. A partir disso, Zanandrea et al (2020) propuseram uma nova representação do fator de impedância W, através do RS (Relative Smoothness Index) que fornece uma nova formulação matemática para utilização do coefi ciente de Manning, mantendo a admensionalidade de IC e aumentando a variação utilizada na ponderação da impedância para as diferentes coberturas do solo.…”

Section: Aplicações Na Avaliação Da Conectividade Dos Sedimentosunclassified

“…Dos trabalhos encontrados, 66% possuem a conectividade como principal objeto de análise, seja a conectividade de sedimentos ou hidrossedimentológica. Dentre os trabalhos com foco em conectividade, apenas quatro (LOPES, 2013;BECKER et al, 2017;ZANANDREA et al, 2019;ZANANDREA et al, 2020) abordam a conectividade quantitativamente, utilizando os índices de conectividade propostos por Borselli et al (2008) e Cavalli et al (2013). Grande parte das abordagens qualitativas segue metodologias baseadas em cruzamento de mapas temáticos (e.g.…”

Section: Estudos Sobre Conectividade Hidrossedimentológica No Brasilunclassified

Conectividade Dos Sedimentos: Conceitos, Princípios E Aplicações

Zanandrea

Paul

Michel

et al. 2020

Rev. Bras. Geomorfol.

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A conectividade de sedimentos pode ser entendida como a transferência de sedimentos entre diferentes compartimentos da paisagem através das relações entre seus componentes. Isso ocorre, principalmente, por meio da interação entre processos hidrológicos e sedimentológicos, os quais, por sua vez, são controlados por características geomorfológicas. O tema vem se tornando fundamental para o entendimento da dinâmica dos sedimentos em uma bacia hidrográfica, pois avalia a transferência dos sedimentos de maneira integrada e inovadora, considerando diferentes processos e características, diferindo das demais metodologias de estudo da dinâmica da paisagem. Consequentemente, muitas metodologias diferentes foram desenvolvidas em todo o mundo para avaliar a conectividade de maneira quantitativa e qualitativa. No entanto, entre esses estudos, diferentes terminologias foram adotadas. Grande parte das metodologias avalia a conectividade dos sedimentos a partir de aspectos estruturais (geomorfológicos) que distribuem no espaço as relações entre os componentes do sistema. Atualmente, são sugeridas abordagens utilizando aspectos funcionais (hidrológicos), que trazem dependência temporal para a conectividade. Entretanto, poucas metodologias inseriram as características do próprio sedimento nesta avaliação. Em relação aos estudos brasileiros, poucas investigações sobre conectividade foram realizadas, surgindo a necessidade de trabalhos considerando as características físicas das bacias brasileiras. A partir disso, a presente revisão discute, inicialmente, os diferentes conceitos de conectividade utilizados atualmente. Em seguida, resume e discute as metodologias desenvolvidas para avaliar a conectividade dos sedimentos, destacando as propriedades estruturais e funcionais relevantes para o estudo da conectividade. Adicionalmente, estudos de conectividade desenvolvidos em território brasileiro são apresentados. Conclui-se que, somente a partir de estudos que levem em conta a interação entre geomorfologia, hidrologia e sedimentologia, será possível uma avaliação integral da conectividade dos sedimentos. Ademais, a conectividade se apresenta como uma potencial ferramenta para o gerenciamento de bacias hidrográficas, trazendo avanços no entendimento da dinâmica dos sedimentos e, consequentemente, na evolução da paisagem.

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Quantifying sediment connectivity: Moving toward a holistic assessment through a mixed methods approach

Turley

Hassan

Slaymaker

2021

Earth Surf Processes Landf

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The sediment connectivity concept is particularly suitable for tackling complex, multidisciplinary questions through systems thinking. However, it is unclear how to directly measure connectivity, and so proxy variables are often applied by indices to provide estimates. In this study, we critically evaluate a broad range of connectivity indices encompassing structural and functional connectivity as well as hillslope channel coupling. We then discuss their role in providing a more holistic estimation of connectivity within the Tahoma Creek Watershed, WA. Of the 14 km of channel below the glacier front, the upper 6 km (0–6 km) are coupled to the adjacent hillslopes. Coupled reaches correspond to regions with a high proportion of area contributing sediment and relatively high connectivity values, where all measures decrease in the downstream direction. A significant transition occurs near river kilometer 6. Here the valley bottom abruptly widens, deposition occurs, and the hillslopes become decoupled from the active channel. This transitional reach is also identified as a geomorphic hotspot based on the network structure. The lower 8 km of channel downstream of this reach are largely depositional and percent contributing area and connectivity values remain low, eventually reaching a minimum. Despite their limitations, we found each method to provide unique and useful information regarding connectivity. The effect of scale and event magnitude on connectivity is illustrated. We also found vegetation, topographic characteristics, and network structure to be important in high‐gradient glacio‐volcanic landscapes. The choice of an index will depend on the research objectives, data availability, and the proxy variables that best describe the variability within the defined area.

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Impedance influence on the index of sediment connectivity in a forested mountainous catchment

Cited by 42 publications

References 27 publications

Interannual evolution of hydrosedimentary connectivity induced by forest cover change in a snow‐dominated mountainous catchment

Interannual evolution of hydrosedimentary connectivity induced by forest cover change in a snow‐dominated mountainous catchment

Conectividade Dos Sedimentos: Conceitos, Princípios E Aplicações

Quantifying sediment connectivity: Moving toward a holistic assessment through a mixed methods approach

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