Numerical Evaluation of the Role of Runon on Sediment Transport over Heterogeneous Hillslopes

2008 ◽  
Vol 13 (4) ◽  
pp. 215-225 ◽  
Author(s):  
N. Nahar ◽  
Rao S. Govindaraju ◽  
Corrado Corradini ◽  
Renato Morbielli
Keyword(s):  
Sediment Transport ◽  
Numerical Evaluation

scholarly journals The role of transition metal ions on HO<sub>x</sub> radicals in clouds: a numerical evaluation of its impact on multiphase chemistry

2004 ◽  
Vol 4 (1) ◽  
pp. 95-110 ◽  
Author(s):  
L. Deguillaume ◽  
M. Leriche ◽  
A. Monod ◽  
N. Chaumerliac
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Aqueous Phase ◽  
Numerical Evaluation ◽  
Transition Metal Ions ◽  
Cloud Chemistry ◽  
Sensitivity Tests ◽  
Fe Speciation ◽  
Deposition Processes

Abstract. A new modelling study of the role of transition metal ions on cloud chemistry has been performed. Developments of the Model of Multiphase Cloud Chemistry (M2C2; Leriche et al., 2001) are described, including the transition metal ions reactivity emission/deposition processes and variable photolysis in the aqueous phase. The model is then applied to three summertime scenarios under urban, remote and marine conditions, described by Ervens et al. (2003). Chemical regimes in clouds are analyzed to understand the role of transition metal ions on cloud chemistry and especially, on HxOy chemistry, which consequently influences the sulphur and the VOCs chemistry in droplets. The ratio of Fe(II)/Fe(III) exhibits a diurnal variation with values in agreement with the available measurements of Fe speciation. In the urban case, sensitivity tests with and without TMI chemistry, show an enhancement of OH concentration in the aqueous phase when TMI chemistry is considered.

scholarly journals The Role of Stakeholders in Cultural Entrepreneurship Management

2016 ◽  
Vol 13 (1) ◽  
pp. 97-103
Author(s):  
Ieva Zemite
Keyword(s):  
Performance Improvement ◽  
Numerical Evaluation ◽  
Third Parties ◽  
Financial Resources ◽  
Media Arts ◽  
Cultural Management ◽  
Cooperation Partners ◽  
Cultural Entrepreneurship ◽  
Economic Use

Abstract The skills and knowledge of the owners and employees of cultural enterprises on economic use of financial resources do not guarantee valuable artistic results. Therefore, a substantiated question has arisen: how to evaluate management in enterprises with bad financial ratios and outstanding artistic indicators. The existing definitions of cultural management (Aageson, 2008; Hagoort, 2007; Klamer, 1999; Stam, 2006; Nordman, 2003) also do not provide precise suggestions for determining the most important indicators in the evaluation of cultural management. The question is how to evaluate management in cultural entrepreneurship by determining the most important indicators for a cultural enterprise’s performance improvement. In order to define the goal of the stakeholders’ (artists, clients, media, arts scholars, third parties providing funds, cooperation partners) engagement, it is necessary to analyse the area of an enterprise’s activities, and in what way and by what kind of activities it is possible to engage the stakeholders. During the course of empirical research, it is planned to disclose, analyse and interpret the subjective reasons of pursuit. Although a numerical evaluation of stakeholders was obtained during the research and data analysis performed by Spearman’s rho correlation calculations, the obtained results during the interpretation have not been generalised. The research results reveal the role of the cultural enterprise’s stakeholders’ engagement in the evaluation of management, point to the importance of the goals’ analysis as well as the analysis of each stakeholder’s engagement, and define the criteria for evaluating the activities in cultural entrepreneurship.

Hydro-morphodynamic modelling of floodplains: the role of vegetation in suspended sediment transport

2020 ◽  
Author(s):  
Daniel A. S. Conde ◽  
Robert M. Boes ◽  
David F. Vetsch
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Flow Resistance ◽  
Laboratory Data ◽  
Anthropogenic Factors ◽  
Future Research ◽  
Suspended Sediment Transport ◽  
Compound Channels ◽  
Closure Models

&lt;p&gt;Riverine environments are amongst the most complex ecosystems on the planet. As several anthropogenic factors have increasingly disrupted the natural dynamics of rivers, namely through stream regulation, the need for re-establishing the ecological role of these systems has gained relevance.&lt;/p&gt;&lt;p&gt;Of particular interest are floodplains in compound channels, primarily regarded for safety against floods, but which also comprise an extensive realm for ecological functions and establishment of various species. Floodplain vegetation affects flow resistance and dispersion, playing a fundamental role in erosion and deposition of suspended sediment.&lt;/p&gt;&lt;p&gt;The present work aims at quantifying the interaction between vegetation and suspended sediment transport on floodplains in compound channels by numerical simulations. The employed numerical tool is BASEMENT v3, a GPU-accelerated hydro-morphodynamic 2D model developed at the Laboratory of Hydraulics, Hydrology and Glaciology of ETH Zurich. In the context of the present study, the model is extended with turbulence and suspended sediment transport capabilities. The implemented closure models for turbulence pertain to three major groups, namely (i) mixing-length, (ii) production-dissipation and (iii) algebraic stress models. For suspended sediment transport, the main classical formulations from fluvial hydraulics were implemented in the numerical model.&lt;/p&gt;&lt;p&gt;Laboratory data from flume experiments featuring suspended sediment load and vegetation-like proxies are used for model validation. The numerical results are compared with the observed water depths, velocities and sediment concentrations for different sets of experiments with varying properties, such as density and submergence. The implemented closure models for flow resistance, turbulence and suspended sediment are then combined, calibrated and classified in terms of numerical output quality.&lt;/p&gt;&lt;p&gt;The obtained results from this modelling effort mainly contribute to understanding the applicability of 2D (depth-averaged) models to complex eco-morphodynamics scenarios. The calibration and rating of well-known closure models for turbulence and sediment transport provides relevant guidelines for both future research and practice in fluvial modelling.&lt;/p&gt;

The role of kelp in sediment transport: Observations from southeast New Zealand

2011 ◽  
Vol 281 (1-4) ◽  
pp. 35-42 ◽  
Author(s):  
Christopher J. Garden ◽  
Abigail M. Smith
Keyword(s):  
New Zealand ◽  
Sediment Transport

scholarly journals How Sediment Transport Sways Wetland Stability

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
Lily Strelich
Keyword(s):  
Sediment Transport ◽  
Sea Level Rise ◽  
Suspended Sediment ◽  
Sea Level ◽  
Coastal Wetlands ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration

Scientists examine the role of variables like tides and suspended sediment concentration to improve methods of evaluating coastal wetlands and how they may respond to future sea level rise.

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