A hybrid approach to transport processes in the Gulf of Naples: an application to phytoplankton and zooplankton population dynamics

2005 ◽  
Vol 25 (5-6) ◽  
pp. 711-728 ◽  
Author(s):  
L. Grieco ◽  
L.-B. Tremblay ◽  
E. Zambianchi
Keyword(s):  
Population Dynamics ◽  
Hybrid Approach ◽  
Transport Processes ◽  
Gulf Of Naples ◽  
Zooplankton Population

scholarly journals Modelling braided river morphodynamics using a particle travel length framework

2018 ◽  
Author(s):  
Alan Kasprak ◽  
James Brasington ◽  
Konrad Hafen ◽  
Richard D. Williams ◽  
Joseph M. Wheaton
Keyword(s):  
Path Length ◽  
Numerical Models ◽  
Hybrid Approach ◽  
Length Distribution ◽  
Transport Processes ◽  
Model Verification ◽  
Event Scale ◽  
Effective Discharge ◽  
Volumetric Assessment ◽  
Decadal Scale

Abstract. Numerical models that predict channel evolution are an essential tool for investigating processes that occur over timescales which render field observation intractable. The current generation of morphodynamic models, however, either oversimplify the relevant physical processes, or in the case of more physically-complete CFD based codes, have computational overheads that restrict severely the space-time scope of their application. Here we present a new, open-source, hybrid approach that seeks to reconcile these modelling philosophies. This framework combines steady-state, two-dimensional CFD hydraulics with a rule-based sediment transport algorithm to predict particle mobility and transport paths which are used to route sediment and evolve the bed topography. Data from two contrasting natural braided rivers (Rees, New Zealand and Feshie, United Kingdom) were used for multi-scalar model verification incorporating reach-scale quantitative morphological change budgets and volumetric assessment of different braiding mechanisms. The model was able to simulate eight of ten empirically observed braiding mechanisms from the parameterized bed erosion, transport, and deposition. Representation of bank erosion and bar edge trimming necessitated the inclusion of a lateral channel migration algorithm. Comparisons between simulations based on steady effective discharge versus event hydrographs represented as a series of steady states were found to only marginally increase the predicted volumetric change, with greater deposition offsetting erosion. A decadal-scale simulation indicates that accurate prediction of event-scale scour depth and subsequent deposition present a methodological challenge because the predicted pattern of deposition may never catch up to erosion if a simple path-length distribution is employed, thus resulting in channel over-scouring. It may thus be necessary to augment path length distributions to preferentially deposit material in certain geomorphic units. We anticipate that the model presented here will be used as a modular framework to explore the effect of different process representations, and as a learning tool designed to reveal the relative importance of geomorphic transport processes in rivers at multiple timescales.

scholarly journals Zooplankton population dynamics in experimentally toxified pond ecosystems

1991 ◽  
Vol 24 (3) ◽  
pp. 1517-1521
Author(s):  
Michael E. Sierszen ◽  
Harry L. Boston ◽  
Michael J. Horn
Keyword(s):  
Population Dynamics ◽  
Zooplankton Population ◽  
Pond Ecosystems

Hybrid approach for the integrated scheduling of production and transport processes along supply chains

2017 ◽  
Vol 56 (5) ◽  
pp. 2019-2035 ◽  
Author(s):  
Enzo Morosini Frazzon ◽  
Andre Albrecht ◽  
Matheus Pires ◽  
Eduardo Israel ◽  
Mirko Kück ◽  
...  
Keyword(s):  
Supply Chains ◽  
Hybrid Approach ◽  
Transport Processes ◽  
Integrated Scheduling

scholarly journals Climate Impacts on Zooplankton Population Dynamics in Coastal Marine Ecosystems

Oceanography ◽  
2013 ◽  
Vol 26 (4) ◽  
pp. 34-51 ◽  
Author(s):  
Harold Batchelder ◽  
Kendra Daly ◽  
Cabell Davis ◽  
Rubao Ji ◽  
Mark Ohman ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Marine Ecosystems ◽  
Climate Impacts ◽  
Zooplankton Population ◽  
Coastal Marine ◽  
Coastal Marine Ecosystems

Zooplankton Population Dynamics and Diaptomus Production in Waldsea Lake, a Saline Meromictic Lake in Saskatchewan

1979 ◽  
Vol 36 (12) ◽  
pp. 1431-1438 ◽  
Author(s):  
Michael C. Swift ◽  
U. Theodore Hammer
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Vertical Distribution ◽  
Standing Crop ◽  
Brachionus Plicatilis ◽  
Dry Weight ◽  
Meromictic Lake ◽  
Zooplankton Species ◽  
Daphnia Similis ◽  
Zooplankton Population

Zooplankton population dynamics were monitored in meromictic saline Waldsea Lake, Saskatchewan, during 1974–75. The dominant zooplankton species were Diaptomus connexus, Brachionus plicatilis, Hexarthra fennica, and Daphnia similis. Diaptomus had a 1-yr life cycle. Overwintered late-stage copepodites molted into adults in May and June and were followed by sequential peaks in numbers of eggs, nauplii, and copepodites. The estimated annual production of this species was 0.6 g dry weight∙m−2 or 0.3 g C∙m−2. About 4% of the annual planktonic primary production would be required to support Diaptomus if it is 10% efficient. The standing crop of Brachionus and Hexarthra was highest in the spring and declined thereafter; Hexarthra was more abundant than Brachionus. The standing crop of Daphnia was much lower than that of either rotifer and showed a spring and fall peak in abundance. Differences in vertical distribution were present among the zooplankton species but no real vertical migrations were observed. Key words: Diaptomus connexus, zooplankton, population dynamics, production, saline meromictic lake

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