Determining longitudinal dispersion coefficients for submerged vegetated flow

Shucksmith, James; Boxall, Joby; Guymer, I.

doi:10.1029/2011wr010547

Cited by 39 publications

(54 citation statements)

References 38 publications

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“…The presence of in-stream vegetation thereby reduces the exchange rates, increasing the release timescale of solute retention (Hendricks and White 1991;Harvey and Bencala 1993;Brunke and Gonser 1997;Cardenas et al 2004). A number of studies have attempted to quantify the effect of submerged and emergent vegetation on the dispersion of solutes (Nepf 1999;Nepf et al 2007;Shucksmith et al 2011) and the storage effects associated with microbial biofilms (Battin et al 2003;Bottacin-Busolin et al 2009). …”

Section: The Effect Of Vegetationmentioning

confidence: 99%

Exchange of Pollutants Between Rivers and the Surrounding Environment: Physical Processes, Modelling Approaches and Experimental Methods

Zaramella

Bottacin‐Busolin

Tregnaghi

et al. 2015

Rivers – Physical, Fluvial and Environmental Processes

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The fate of solute and pollutants is controlled by a broad number of different transport and storage mechanisms, ranging from simple processes (i.e. molecular diffusion, advection etc.) to more complex phenomena (i.e. evapotranspiration, groundwater flows, etc.). Different mathematical models, accounting for different exchange processes, have been developed and applied to specific experimental studies to assess transport and storage parameters. Experimental research focused on transport and retention processes induced by the transient storage in the dead zones, by the river bed topography and vegetation, by evapotranspiration. The analysis of these physical processes is generally conducted observing the behavior of solutes in field environments or in scaled laboratory models, using artificial or environmental tracers to track the fate of transported substances and assess transport and retention parameters. To improve the knowledge of pollutant exchange mechanism between a river and the surrounding environment, new experimental techniques focusing on long timescale retention and investigating the link between river biology and hydrodynamics are required. The development of new protocols for tracer tests design and the use of new specific tracers will open future research perspectives.

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Section: The Effect Of Vegetationmentioning

confidence: 99%

Exchange of Pollutants Between Rivers and the Surrounding Environment: Physical Processes, Modelling Approaches and Experimental Methods

Zaramella

Bottacin‐Busolin

Tregnaghi

et al. 2015

Rivers – Physical, Fluvial and Environmental Processes

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“…Liu et al [22] studied longitudinal dispersion in flow along the floating vegetation patch. They also indicated that a large number of studies on the longitudinal dispersion in open-channel flows with submerged and emergent vegetation have been presented [16,[23][24][25]. However, there is an insufficient number of studies on the effects of floating vegetation patches in the literature [22].…”

Section: Introductionmentioning

confidence: 99%

Near-Wake Flow Structure of a Suspended Cylindrical Canopy Patch

Ozan

Yilmazer

2019

Water

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Urban stormwater is an important environmental problem, especially for metropolitans worldwide. The most important issue behind this problem is the need to find green infrastructure solutions, which provide water treatment and retention. Floating treatment wetlands, which are porous patches that continue down from the free-surface with a gap between the patch and bed, are innovative instruments for nutrient management in lakes, ponds, and slow-flowing waters. Suspended cylindrical vegetation patches in open channels affect the flow dramatically, which causes a deviation from the logarithmic law. This study considered the velocity measurements along the flow depth, at the axis of the patch, and at the near-wake region of the canopy, for different submerged ratios with different patch porosities. The results of this experimental study provide a comprehensive picture of the effects of different submergence ratios and different porosities on the flow field at the near-wake region of the suspended vegetation patch. The flow field was described with velocity and turbulence distributions along the axis of the patch, both upstream and downstream of the vegetation patch. Mainly, it was found that suspended porous canopy patches with a certain range of densities (SVF20 and SVF36 corresponded to a high density of patches in this study) have considerable impacts on the flow structure, and to a lesser extent, individual patch elements also have a crucial role.

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“…Hydraulic model is widely used to simulate the flow circulation, temperature dynamics, contaminant transport and advanced eutrophication processes (Nepf, 2012). It has also been applied in the simulation and decision support analysis of surface water such as lakes, reservoirs, bays, wetlands and estuaries (Shucksmith et al, 2011;Wu et al, 2o14;Wang et al, 2015). By comparison, ecological models can simulate a variety of ecological processes, dynamics across multi-species at different trophic levels, and can be used to establish a quantitative linkage between external nutrient loading, internal water quality conditions and holistic ecosystem response.…”

Section: Introductionmentioning

confidence: 99%

Environmental flow management strategies based on the integration of water quantity and quality, a case study of the Baiyangdian Wetland, China

Yang

Yin

Zhang

2016

Ecological Engineering

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Environmental flow plays an important role in sustaining or improving wetland ecosystems. There are many methods for environmental flow assessments, most of which only focus on simplistic environmental flow standards or theoretical cause-effect relations between flow regime and target species. However, traditional assessments may not be suitable for ecosystems with severe water quality deterioration. Ignoring relationships among flow, water quality, and multi-level ecological responses in real and complex ecosystems may misguide management practices and lead to further ecosystem degradation. To investigate impacts of flow alteration on ecosystems with different pollution rates, and examine the underlying mechanisms, a two-dimensional hydraulic and ecological model was developed in this study. This model simulates flow circulation; pollutant transport; and the interactions between flow, nutrients, and holistic ecosystem characteristics. The integrated model was applied to 21 scenarios to understand ecosystem characteristics in response to various environmental flow rates and water quality standards. Finally, holistic indicators including total primary production/total respiration, total biomass/total production, eco-exergy, and structural eco-exergy are used to quantify the effects of different scenarios on ecosystem health, and provide scientific environmental flow recommendations. The proposed method was applied to Baiyangdian, the largest wetland in the North China Plain. The results indicate that the annual environmental flow should be higher than 0.5 m 3 /s in order to prevent the Baiyangdian ecosystem from further degradation. To maintain an optimal ecosystem status, the minimum environmental flow should be kept as 5-9.5 m 3 /s, and the maximum environmental flow should be kept as 9-13.5 m 3 /s in different hydrological years. In addition, the water quality should be always kept at or above the Chinese Class IV standard. This 3 result can guide basic research in hydroecology and assist further implementation of comprehensive freshwater environmental flow management.

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Determining longitudinal dispersion coefficients for submerged vegetated flow

Cited by 39 publications

References 38 publications

Exchange of Pollutants Between Rivers and the Surrounding Environment: Physical Processes, Modelling Approaches and Experimental Methods

Exchange of Pollutants Between Rivers and the Surrounding Environment: Physical Processes, Modelling Approaches and Experimental Methods

Near-Wake Flow Structure of a Suspended Cylindrical Canopy Patch

Environmental flow management strategies based on the integration of water quantity and quality, a case study of the Baiyangdian Wetland, China

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