Effects of vegetation at a bar confluence on river hydrodynamics: The case study of the Arno River at Greve junction

Artini, Giada; Calvani, Giulio; Francalanci, Simona; Solari, Luca

doi:10.1002/rra.3774

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…As suggested by previous ecohydraulic studies and reviews [33][34][35], riverine vegetation's canopy morphometric trends can be easily described by the well-known leaf area index (LAI). This parameter must be properly considered in predictive and numerical modeling of vegetated rivers in urban areas for taking rigorously into account the real-scale impacts of riverine vegetation evolution on flow resistance in vegetated streams, to be then robustly validated by vegetational and water flow measurements acquired during experimental ecohydraulic field campaigns [36,37].…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Efficiency of Green-Blue Flood Control Scenarios for Vegetated Rivers: 1D and 2D Unsteady Simulations

Lama

Giovannini

Errico

et al. 2021

Water

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Flood hazard mitigation in urban areas crossed by vegetated flows can be achieved through two distinct approaches, based on structural and eco-friendly solutions, referred to as grey and green–blue engineering scenarios, respectively; this one is often based on best management practices (BMP) and low-impact developments (LID). In this study, the hydraulic efficiency of two green–blue scenarios in reducing flood hazards of an urban area crossed by a vegetated river located in Central Tuscany (Italy), named Morra Creek, were evaluated for a return period of 200 years, by analyzing the flooding outcomes of 1D and 2D unsteady hydraulic simulations. In the first scenario, the impact of a diffuse effect of flood peak reduction along Morra Creek was assessed by considering an overall real-scale growth of common reed beds. In the second scenario, riverine vegetation along Morra Creek was preserved, while flood hazard was mitigated using a single vegetated flood control area. This study demonstrates well the benefits of employing green–blue solutions for reducing flood hazards in vegetated rivers intersecting agro-forestry and urban areas while preserving their riverine ecosystems. It emerged that the first scenario is a valuable alternative to the more impacting second scenario, given the presence of flood control areas.

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Section: Introductionmentioning

confidence: 99%

Hydraulic Efficiency of Green-Blue Flood Control Scenarios for Vegetated Rivers: 1D and 2D Unsteady Simulations

Lama

Giovannini

Errico

et al. 2021

Water

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“…In addition, the momentum flux of the Yangtze River was large, its flow moved fast and seemed to rush to the right bank and then abruptly changed its direction to the left bank, which is consistent with the experimental results when the confluence ratio was 0.35 and 0.5. In addition, a field study on investigating the effects of vegetation on Arno river (Italy) confluence hydrodynamics conducted by Artini et al (2021) was also compared with our experimental results. Their field survey also observed that vegetation over river bars drives high-velocity flow towards a narrower part of the channel, similar to the top layer of our experimental channel.…”

Section: Discussionmentioning

confidence: 99%

An experimental study of the hydrodynamics and contaminant transport in a Y‐shaped confluence with flexible submerged vegetation

Tong

Liu

Yang

et al. 2022

Hydrological Processes

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Vegetation greatly affects the flow characteristics and contaminant transport in river confluences. In this study, the flow characteristics and contaminant transport in the non‐vegetated/vegetated Y‐shaped confluence were explored systematically through a series of experiments. A total of 10 scenarios were designed to answer the three main research questions: what is the difference between the flow characteristics and contaminant transport in (1) asymmetrical and Y‐shaped confluences; (2) non‐vegetated/vegetated Y‐shaped confluences; (3) vegetated Y‐shaped confluences with different confluence ratios? The experimental results revealed that vegetation remarkably changes the internal flow structure in Y‐shaped confluences. Briefly, the velocity profile can be divided into three vertical layers within the vegetated system, but it remains nearly constant in the non‐vegetated channel. Vegetation changes the circulation location and reduces the intensity of the secondary current, weakening the strength of contaminant mixing. However, the turbulent kinetic energy within the vegetated system is larger than that in the non‐vegetated case, and it peaks at the top of the vegetation canopy. Under different confluence ratio cases, the overall fluctuation of the longitudinal dispersion coefficients along the cross‐sections in the mainstream was similar but increasing the confluence ratio causes the circulation to appear to advance and enhances its intensity. In addition, the vegetation density (200 item/m2) in this study render the manning roughness coefficient at 0.068, which is larger than that under lower vegetation density cases. The outcomes from this study are helpful for both environmental and river management applications.

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“…Riparian vegetation is an important component of riparian ecosystems ( Stromberg, 2001 ). Riparian vegetation is the primary producer in a riparian ecosystem and plays important functions in energy flow, information flow and biological flow between aquatic and terrestrial ecosystems ( Artini et al, 2021 ). At the same time, vegetation in the riparian zone can control soil erosion and non-point source pollutants in the riparian zone and has unique environmental functions in the whole river ecosystem ( Story et al, 1953 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

Yang

et al. 2022

Front. Plant Sci.

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The influence of the construction of dams for water diversion on the ecological environment has attracted recent widespread attention. Over time, dams have emerged as one of the most important factors affecting the vegetation along the riparian zones of rivers. To elucidate the effects of cascade dams on riparian vegetation along the middle and lower reaches of the Hanjiang River, we examined riparian vegetation types upstream and downstream from dams. A total of 14 sample sites and 131 quadrats perpendicular to the river were investigated in June 2019, and 14 sample sites and 134 quadrats were investigated in October 2019. The riparian vegetation was divided into 15 (in June) and 11 (in October) vegetation types by two-way indicator species analysis (TWINSPAN). Significant differences were found between the vegetation types upstream and downstream of dams. Redundancy analysis (RDA) showed that soil moisture content, distance from the water, altitude and soil total nitrogen (TN) were the main environmental factors affecting plants distributions, and soil moisture content was the main factor affecting the zonal distribution of vegetation. By analyzing the impact of cascade dams on the hydrological regime, we found that the construction of cascade dams led to the differentiation of vegetation types upstream and downstream of the dam, and the riparian habitats were fragmented by these dams. This study provides both an important reference for the protection of riparian vegetation and riparian ecosystems and a basis for the management and restoration of river ecosystems after the construction of cascade dams.

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Effects of vegetation at a bar confluence on river hydrodynamics: The case study of the Arno River at Greve junction

Cited by 5 publications

References 30 publications

Hydraulic Efficiency of Green-Blue Flood Control Scenarios for Vegetated Rivers: 1D and 2D Unsteady Simulations

Hydraulic Efficiency of Green-Blue Flood Control Scenarios for Vegetated Rivers: 1D and 2D Unsteady Simulations

An experimental study of the hydrodynamics and contaminant transport in a Y‐shaped confluence with flexible submerged vegetation

Effects of South-to-North Water Diversion Project Cascade Dams on Riparian Vegetation Along the Middle and Lower Reaches of the Hanjiang River, China

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