Spatial-temporal assessment of water and sediment connectivity through a modified connectivity index in a subtropical mountainous catchment

Zanandrea, Franciele; Michel, Gean Paulo; Kobiyama, Masato; Censi, Guilherme; Abatti, Bruno Henrique

doi:10.1016/j.catena.2021.105380

Cited by 26 publications

(14 citation statements)

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“…Functional connectivity was assessed using the index of hydrosedimentological connectivity (IHC) developed by Zanandrea et al (2021). The IHC is a modification of the IC (Cavalli et al, 2013) and adds water dynamics to the representation of sediment connectivity.…”

Section: Functional Connectivitymentioning

confidence: 99%

“…Thus, the main objective of this work is to validate the proposed indexes from field data and demonstrate the relevance of this in the evaluation of the functional connectivity of registered rainfall events, concomitantly with the evaluation of structural elements that control the connectivity in headwater regions of a hydrographic catchment of the Serra Geral Brazil system. For this, the evaluation was performed combining the structural index proposed by Borselli et al (2008) and Cavalli et al (2013), a functional index adapted by Zanandrea et al (2021), field surveys and hydrological monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Relevance of field data in the assessment of structural and functional sediment connectivity in a small catchment of southern Brazilian plateau

Abatti

Zanandrea

Paul

et al. 2022

Earth Surf Processes Landf

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Hydrological and sedimentological dynamics are controlled by hillslope‐channel (de)coupling, which is influenced by several natural and anthropogenic factors. However, studies on sediment connectivity are recent and present numerous challenges to be overcome. Furthermore, there is a need to explore and identify sediment connectivity governing processes and phenomena. In this study, hydrological monitoring and indices application were used to access aspects of sediment connectivity in a small catchment (0.89 km2), located on a plateau in southern Brazil. The indices are a combination of variables conceptually known as controllers of the spatial and temporal organization of sediment flows in the system. The application of these tools proved to be relevant for the characterization of structural and functional connectivity of the study area. The tools applied were structural index of connectivity (IC); index of hydrosedimentological connectivity (IHC), based on observed events; field connectivity index (FIC). The characterization of structural connectivity highlighted natural sinks and blankets zones as the main elements of disconnection in the catchment. The functional connectivity was evaluated for five distinct magnitude events, the results showed a higher influence of sediment availability and antecedent moisture conditions than the other structural factors. The FIC validated the theoretical indices in the study area and highlighted the importance of coupling thresholds between the numerous sediment sources in a known event.

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Section: Functional Connectivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relevance of field data in the assessment of structural and functional sediment connectivity in a small catchment of southern Brazilian plateau

Abatti

Zanandrea

Paul

et al. 2022

Earth Surf Processes Landf

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“…Sediment connectivity related to soil erosion and sediment delivery has attracted much attention (Najafi, Dragovich, et al, 2021). Previous studies have been dependent on erosion or connectivity modelling to identify patterns of sediment change in watersheds (Lisboa et al, 2017; Tiranti et al, 2018; Zanandrea et al, 2021), which includes assessing the spatiotemporal characteristics (Alewell et al, 2019; Li, Chen, et al, 2022; Wu et al, 2016a) and analysing the causes of changes in soil erosion (Litschert et al, 2014; Panagos et al, 2015). These studies related to sediment connectivity often contribute to watershed sediment management, for example, by using index of connectivity (IC) and universal soil loss equation (USLE) to determine the spatial and temporal variation in sediment yield under the action of check dams (Zhao et al, 2020), and the use of connectivity indicators to identify critical locations where watershed vegetation management interventions or restoration efforts need to be focussed (Turnbull & Wainwright, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Wang and Zhang (2022) detected spatial variation and autocorrelation in the IC of six typical small watersheds on the Loess Plateau. Under different precipitation events, Zanandrea et al (2021) developed a new index (index of hydrosedimentological connectivity [IHC]) to assess the variation in sediment connectivity over time. At short timescales, sediment transport, including redistribution, accumulation and storage, can facilitate sediment connectivity at broader temporal scales (Bracken et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

An integrated watershed modelling framework to explore the covariation between sediment connectivity and soil erosion

Guo,

Wu,

Liu

et al. 2023

European J Soil Science

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Quantitative identification of the covariation between sediment connectivity and soil erosion can contribute to provide the key information for watershed sediment management. However, this covariation and its spatiotemporal response mechanisms are still unclear, especially whether this covariation can be used as a basis for identifying critical source areas of sediment in large‐scale ecological restored watersheds. In this study, an integrated methodology framework by the RUSLE, index of connectivity (IC), and sediment delivery ratio (SDR) was proposed to visually assess the spatiotemporal characteristics of erosion and sediment yield processes in the Yanhe Watershed with large‐scale ecological restoration from 1985 to 2020, and to identify the covariation between sediment connectivity and erosion in subbasins. The soil erosion estimated by RUSLE has decreased by over 80% since 1985 owing to increased vegetation cover and the effective implementation of soil conservation measures, but the upper reaches still have high erosion intensity due to differences in specific controlling factors such as topographic conditions and land cover, requiring focused soil conservation practice. The IC results showed that as the vegetation restoration and soil conservation measures in the Yanhe Watershed varied from year to year, their spatial and temporal patterns had a strong influence on the distribution of sediment connectivity, some local areas in the middle reaches showed local minima of IC in 1995, 1998 and 2010 mainly due to the implementation of long‐term ecological restoration project. The developed IC‐Erosion maps indicated that areas with high‐connectivity but low‐erosion accounted for over 60% of the total watershed area from 1985 to 1999, demonstrating a reverse correlation between sediment connectivity and erosion. Meanwhile, over 40% of the erosion occurred in a few areas (approximately 20%) with high‐connectivity and high‐erosion from 2000 to 2004, which can be characterized as the critical areas of erosion. The methods and results of this study provide ideas for separately defining both erosion and connectivity, and quantifying bi‐variable erosion‐connectivity classification that can be easily viewed on a scatterplot.This article is protected by copyright. All rights reserved.

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“…This has made it possible to understand the past and present of landscapes, and even to assess future trends based on the analysis of the causes that generate erosive forms and deposits [5]. Therefore, the geomorphological characterization of the territory has become an input for the definition of homogeneous units that, integrated with various abiotic and biotic variables, improve the environmental and sustainable management of the territory [6,7].…”

Section: Introductionmentioning

confidence: 99%

Hydrogeomorphology as a Tool in the Evolutionary Analysis of the Dynamic Landscape—Application to Larrodrigo, Salamanca, Spain

Lombana

Martínez-Graña

Criado

et al. 2021

Land

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Evolutionary analysis of the fluvial landscape provides relevant inputs for the environmental management of a territory, in such a way that the understanding of the dynamics of fluvial spaces becomes a preponderant factor in the definition of protection and management strategies. Although the development of geographic information systems is a step forward in the study of the landscape, it is necessary to establish methodological frameworks that make remote sensing techniques available at multiple spatio-temporal scales, especially in basins with high levels of intervention. In the present study, we develop a methodology for the analysis of the fluvial landscape development in the last century of a highly modified water body, through the detailed study of hydrogeomorphic elements, using remote sensing techniques including high-density surface data (LiDAR) and historical aerial imageries; when supported by fieldwork, these allow for the identification of the sequence of sedimentation–erosion zones, differentiating in detail the zones denominated as areas of current erosion, accretion zones, and historical erosion zones. An application of the methodology was carried out in the Larrodrigo stream, located in Salamanca, Spain.

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Spatial-temporal assessment of water and sediment connectivity through a modified connectivity index in a subtropical mountainous catchment

Cited by 26 publications

References 50 publications

Relevance of field data in the assessment of structural and functional sediment connectivity in a small catchment of southern Brazilian plateau

Relevance of field data in the assessment of structural and functional sediment connectivity in a small catchment of southern Brazilian plateau

An integrated watershed modelling framework to explore the covariation between sediment connectivity and soil erosion

Hydrogeomorphology as a Tool in the Evolutionary Analysis of the Dynamic Landscape—Application to Larrodrigo, Salamanca, Spain

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