Effects of Added Vegetation on Sand Bar Stability and Stream Hydrodynamics

Rominger, Jeffrey Tsaros; Lightbody, A.; Nepf, Heidi

doi:10.1061/(asce)hy.1943-7900.0000215

Cited by 115 publications

(112 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vegetation colonization of the bar concentrates flow into a narrower and deeper channel, and may thus increase erosion on the outer bank. Such feedbacks have also been observed at point bars of sandy experimental rivers [10]. The arrangement of plastic tree sapling guards can be seen on both banks; whilst these saplings do not currently exert a significant influence on channel hydrodynamics, as the trees establish they are likely to.…”

Section: Case Studies and Best Practices: Examples From The Ukmentioning

confidence: 64%

“…For instance, Wilson et al [9] studied arrays of submerged flexible vegetation in rivers, and they adjusted the vegetation density by adding fronds on the same array of rods. The addition of vegetation on a sand bar induced changes in the hydrodynamic field in and around that geomorphic feature, leading to scouring at its interface with the main channel (as reported from a field study in [10]). …”

Section: Introductionmentioning

confidence: 70%

“…This observation is in line with those reported in the literature. For example, the presence of vegetation on a sand bar likewise decreased the mean flow over the geomorphic feature but had the opposite effect across the rest of the main channel [10]. Herein, for λ = 1.88 m −1 , the velocity in the riverbank is generally below 0.01 m/s, less than 6 times the average flow velocity in the main channel.…”

Section: Streamwise Velocitymentioning

confidence: 93%

See 2 more Smart Citations

Flow Hydrodynamics across Open Channel Flows with Riparian Zones: Implications for Riverbank Stability

Valyrakis

Williams

2017

Water

View full text Add to dashboard Cite

Riverbank vegetation is of high importance both for preserving the form (morphology) and function (ecology) of natural river systems. Revegetation of riverbanks is commonly used as a means of stream rehabilitation and management of bank instability and erosion. In this experimental study, the effect of different riverbank vegetation densities on flow hydrodynamics across the channel, including the riparian zone, are reported and discussed. The configuration of vegetation elements follows either linear or staggered arrangements as vegetation density is progressively increased, within a representative range of vegetation densities found in nature. Hydrodynamic measurements including mean streamwise velocity and turbulent intensity flow profiles are recorded via acoustic Doppler velocimetry (ADV)-both at the main channel and within the riverbank. These results show that for the main channel and the toe of riverbank, turbulence intensity for the low densities (λ ≈ 0 to 0.12 m −1 ) can increase up to 40% compared the case of high densities (λ = 0.94 to 1.9 m −1 ). Further analysis of these data allowed the estimation of bed-shear stresses, demonstrating 86% and 71% increase at the main channel and near the toe region, for increasing densities (λ = 0 to 1.9 m −1 ). Quantifying these hydrodynamic effects is important for assessing the contribution of physically representative ranges of riparian vegetation densities on hydrogeomorphologic feedback.

show abstract

Section: Case Studies and Best Practices: Examples From The Ukmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 70%

Section: Streamwise Velocitymentioning

confidence: 93%

See 1 more Smart Citation

Flow Hydrodynamics across Open Channel Flows with Riparian Zones: Implications for Riverbank Stability

Valyrakis

Williams

2017

Water

View full text Add to dashboard Cite

show abstract

“…Meanders create a low velocity zone adjacent to point bars that form through deposition of bedload and later suspended sediment. Vegetation growing on deposited coarse bedload material increases stability and roughness, decreases flow velocities, increases deposition of finer suspended sediment (figures 2e and 3b to 3g) (Robertson and Augspurger 1999;Steiger and Gurnell 2003;Rood et al 2003;Robertson 2006;Polzin and Rood 2006), and encourages meander development (Erskine et al 2009(Erskine et al , 2012Rominger et al 2010;Tal and Paola 2010), which decreases stream gradient and power (Bagnold 1966). Deposition of fine alluvial soil facilitates revegetation while it removes water pollution.…”

Section: Geomorphologymentioning

confidence: 99%

Riparian proper functioning condition assessment to improve watershed management for water quality

Swanson¹,

Kozlowski²,

Hall³

et al. 2017

Journal of Soil and Water Conservation

View full text Add to dashboard Cite

Pollutants can be reduced, ameliorated, or assimilated when riparian ecosystems have the vegetation, water, and soil/landform needed for riparian functions. Loss of physical form and ecological function unravels assimilation processes, increasing supply and transport of pollutants. Water quality and aquatic organisms are response measures of accumulated upstream discharges, and ultimately of changes in riparian functions. Thus, water quality monitoring often fails to identify or lags behind many causes of pollution or remediation from riparian degradation. This paper reviews the interagency riparian proper functioning condition (PFC) assessment for lotic (running water) riparian ecosystems and outlines connections between PFC and water quality attributes (sediment, nutrients, temperature, and dissolved oxygen [DO]). The PFC interaction of hydrology, vegetation, and soils/landforms influences water quality by dissipating energy associated with high waterflow, thereby reducing vertical instability and lateral erosion while developing floodplains with captured sediment and nutrients. Slowing flood water enables aquifer recharge, deposition, and plant nutrient uptake. Water-loving, densely rooted streambank stabilizing vegetation and/or wood helps integrate riparian functions to maintain channel pattern, profile, and dimension with characteristics for a diversity of habitats. A complex food web helps slow the nutrient spiral with uptake and storage. Temperature fluctuations are dampened by delayed discharges, narrower and deeper active channels, coarser substrates that enhance hyporheic interchange, and shade from riparian vegetation. After assessment and implementation, monitoring recovery of impaired riparian function attributes (e.g., streambank plant species) naturally focuses on persistent drivers of water quality and aquatic habitat. This provides timely environmental indicators of stream ecological health and water quality remediation projects or land management. Key words: environmental indicators-function-nutrients-rivers and streamssediment-temperatureWater quality standards are based on needs for beneficial uses, whereas opportunities for remediation are often based on need(s) for riparian functions. Water quality or biological community assessments (USEPA 2009a(USEPA , 2009b cannot predict if an ecosystem is crossing geomorphic or ecological thresholds causing devastating changes to the riparian and aquatic ecosystems (Hall et al. 2014;Kozlowski et al. 2013). For nonpoint source issues, water quality data are lagging indicators (response indicators) and do not inform riparian resource managers or riparian restoration monitors in a timeframe relevant for adaptive management. Water quality and many other terrestrial and aquatic ecosystem goods and services depend on riparian functions. One of the goals of many federal, state, and tribal environmental and natural resource programs is to maintain and restore functionality of stream and wetland riparian areas. This impacts sediment and nutrient loa...

show abstract

“…Vegetation consolidates and stabilizes riverbanks, allowing for meandering rivers to develop instead of braided streams (Murray and Paola, 2003;Rominger et al, 2010;Tal and Paola, 2007). Vegetation also grows within the channel as well as along the banks.…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

Investigation of the effect of a circular patch of vegetation on turbulence generation and sediment deposition using four case studies

Ortiz¹

2012

View full text Add to dashboard Cite

Effects of Added Vegetation on Sand Bar Stability and Stream Hydrodynamics

Cited by 115 publications

References 32 publications

Flow Hydrodynamics across Open Channel Flows with Riparian Zones: Implications for Riverbank Stability

Flow Hydrodynamics across Open Channel Flows with Riparian Zones: Implications for Riverbank Stability

Riparian proper functioning condition assessment to improve watershed management for water quality

Investigation of the effect of a circular patch of vegetation on turbulence generation and sediment deposition using four case studies

Contact Info

Product

Resources

About