scholarly journals TIDE-TSUNAMI INTERACTION IN A HIGHLY ENERGETIC CHANNEL. A CASE STUDY.

2018 ◽  
pp. 83
Author(s):  
Patricio Winckler ◽  
Ignacio Sepúlveda ◽  
Felipe Aron ◽  
Manuel Contreras-López
Keyword(s):  
Spring Tide ◽  
Nonlinear Effects ◽  
Composite Model ◽  
Fundamental Question ◽  
Shallow Waters ◽  
Full Model ◽  
Linear Superposition ◽  
Composite Models ◽  
Tide Interaction

Tsunami–tide interaction can be assessed using different approaches with increasing levels of complexity. The simplest is to compute the sea level through a linear superposition of the tide and the tsunami computed independently (composite model). Recent studies have found that composite models provide inaccurate results in shallow waters (e.g. Kowalik et al, 2010). A more realistic analysis is achieved by computing the tsunami and the tide together (full model). This approach is appropriate where nonlinear effects may be important due to strong tides or shallow bathymetries. This work is intended to improve the physical understanding of tide-tsunami interaction in Canal Chacao, a highly energetic channel sited in Chile. This channel is dominated by currents of up to 6 [m/s] during spring tide and is located in a region prone to tsunamis. The fundamental question is to assess under which conditions tides and tsunamis can be linearly superposed and in which they interact nonlinearly, thus enhancing or reducing the surface elevation and associated currents.

scholarly journals Collaborative monitoring of the ornamental trade of seahorses and pipefishes (Teleostei: Syngnathidae) in Brazil: Bahia State as a case study

2006 ◽  
Vol 4 (2) ◽  
pp. 247-252 ◽  
Author(s):  
Ierecê L. Rosa ◽  
Cláudio L. S. Sampaio ◽  
Adrianne T. Barros
Keyword(s):  
Monitoring Program ◽  
The State ◽  
Shallow Waters ◽  
Aquarium Trade ◽  
Plastic Bags ◽  
Ornamental Trade

Many species of seahorses and pipefishes (family Syngnathidae) are traded for medicinal purposes and aquaria; some are also sold as souvenirs or curiosities. Brazil is one of the main suppliers of seahorses for the international aquarium trade, nevertheless, little is known about the magnitude of that trade in the country. With regards to pipefishes, virtually nothing is known about their captures for ornamental purposes in Brazil. The present study assesses the magnitude of captures and trade of seahorses and pipefishes, based on data obtained through a collaborative monitoring program established with the main retailer of marine ornamental organisms in the State of Bahia. The syngnathid fishery is conducted in shallow waters never exceeding 7 m, generally by breathhold diving. Both seahorses and pipefishes are mostly caught by hand, and only rarely hand-nets or plastic bags are used. From January/1997 to June/2005, 152 fishers recorded their daily catches of syngnathids. Two species of seahorses, Hippocampus reidi and H. cf. erectus (9,793 specimens captured from 1997 to 2005) and three species of pipefishes, Cosmocampus albirostris, Micrognathus sp. and Syngnathus sp. (143 specimens captured from 1999 to 2005) were traded. H. reidi was the most heavily exploited species.

scholarly journals Low-cost monitoring buoys network tracking biogeochemical changes in lakes and marine environments – a regional case study

2018 ◽  
Vol 90 (10) ◽  
pp. 1631-1646 ◽  
Author(s):  
Alejandro J. Vitale ◽  
Gerardo M.E. Perillo ◽  
Sibila A. Genchi ◽  
Andrés H. Arias ◽  
María Cintia Piccolo
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Decision Makers ◽  
Shallow Waters ◽  
Global Level ◽  
Temperate Region ◽  
Coastal Marine ◽  
The Cost

AbstractLakes, rivers, estuaries and ocean waters control many important natural functions at the regional-global level. Hence, integrative and frequent long-term water monitoring is required globally. This paper describes the main features and innovations of a low-cost monitoring buoys network (MBN) deployed in a temperate region of Argentina. The MBN was designed to record extended time series at high-frequency, which is of great value for the scientific community, as well as for decision-makers. In addition, two innovative designs belonging to two versions of moored buoys (i.e. shallow waters and coastal marine waters) were presented. It was shown that the cost of either of two versions of the buoy is low, which can be considered as the main advantage.

The time-varying characteristics in tidal duration asymmetry

2020 ◽  
Author(s):  
Guo Wenyun ◽  
Song Dehai ◽  
Guo Leicheng ◽  
Ge Jianzhong ◽  
Ding Pingxing ◽  
...  
Keyword(s):  
Neap Tide ◽  
Spring Tide ◽  
Time Variability ◽  
Tidal Asymmetry ◽  
Water Effect ◽  
The Changjiang Estuary ◽  
Tidal Constituents ◽  
Sea Area ◽  
Tide Interaction ◽  
Shallow Water Effect

<p>Tides always behaves different rising and falling durations, which can mostly attribute to the shallow-water effect and interactions among tidal constituents. The duration asymmetry may lead to an inequality in flood/ebb tidal current magnitudes, affecting the net sediment transport. Tidal duration asymmetry has time-dependent characteristics. We deducted a general framework for identifying the time-variability in tidal duration asymmetry. The application to the global tides showed that the fortnightly variability in tidal asymmetry is universal and that duration asymmetry can be stronger during neap tide than during spring tide. Then the framework is applied to the tides in the Changjiang Estuary. Prominent seasonal variation in tidal asymmetry is revealed, mainly relate to the river-tide interaction. Application to the tides in the Yangshan Harbor sea area revealed that the local-scale tidal asymmetry can be changed strongly by a large coastal engineering.</p>

scholarly journals A composite computational model of liver glucose homeostasis. I. Building the composite model

2011 ◽  
Vol 9 (69) ◽  
pp. 689-700 ◽  
Author(s):  
J. Hetherington ◽  
T. Sumner ◽  
R. M. Seymour ◽  
L. Li ◽  
M. Varela Rey ◽  
...  
Keyword(s):  
Computational Model ◽  
Composite Model ◽  
Physiological Data ◽  
Small Scale ◽  
Model Parameters ◽  
High Scale ◽  
Composite Models ◽  
The Individual ◽  
Component Models

A computational model of the glucagon/insulin-driven liver glucohomeostasis function, focusing on the buffering of glucose into glycogen, has been developed. The model exemplifies an ‘engineering’ approach to modelling in systems biology, and was produced by linking together seven component models of separate aspects of the physiology. The component models use a variety of modelling paradigms and degrees of simplification. Model parameters were determined by an iterative hybrid of fitting to high-scale physiological data, and determination from small-scale in vitro experiments or molecular biological techniques. The component models were not originally designed for inclusion within such a composite model, but were integrated, with modification, using our published modelling software and computational frameworks. This approach facilitates the development of large and complex composite models, although, inevitably, some compromises must be made when composing the individual models. Composite models of this form have not previously been demonstrated.

scholarly journals Hydro-Sedimentary Study of a Tidal River: Case Study of the Arvand River in Iran

2021 ◽  
Vol 11 (1) ◽  
pp. 9-16
Author(s):  
M. Bakhtiari ◽  
A. Ashtari Larki ◽  
A. Samer
Keyword(s):  
Electrical Conductivity ◽  
Field Study ◽  
Water Level ◽  
Neap Tide ◽  
Spring Tide ◽  
Suspended Sediments ◽  
Tidal River ◽  
Deep Distribution ◽  
Suspended Sediments Concentration

Abstract The present field study investigated hydraulic and sediment in tidal conditions. Measurements were made for two stations at neap tide and spring tide for 13-hour periods at no-dimensional depths of 0.2, 0.6 and 0.8 of the water level each time. In these measurements, the parameters of velocity, direction of flow, electrical conductivity, temperature and depth were measured directly, and to determine the amount of suspended sediments per hour, 3 samples of one litre from the mentioned depths were measured by the instantaneous vertical sampler and taken to a laboratory. An examination of the depth charts of the suspended sediments concentration for all stations, and in both the neap tide and the spring tide, showed that, in general the suspended sediments concentration increased with increasing depth. Moreover, the deep distribution of sediments concentration showed that the values obtained in the laboratory corresponded well with the values calculated from the Rouse equation, and as the depth increases, the sediments concentration usually increases.

Predictive simulation of ecological space based on a particle swarm optimization-Markov composite model: A case study for Chang-Zhu-Tan urban agglomerations

2018 ◽  
Vol 38 (1) ◽  
Author(s):  
陈永林 CHEN Yonglin ◽  
谢炳庚 XIE Binggeng ◽  
钟典 ZHONG Dian ◽  
吴亮清 WU Liangqing ◽  
张爱明 ZHANG Aiming
Keyword(s):  
Particle Swarm Optimization ◽  
Particle Swarm ◽  
Composite Model ◽  
Swarm Optimization ◽  
Predictive Simulation ◽  
Urban Agglomerations

scholarly journals Spill Impact Mitigation Assessment Case Study: Dispersants Use in Shallow Waters of Northern Caspian Sea

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Victoria Broje ◽  
Nazgul Utegen
Keyword(s):  
Oil Spill ◽  
Caspian Sea ◽  
Economic Impacts ◽  
Careful Analysis ◽  
Shallow Waters ◽  
Environmental Benefit ◽  
Response Options ◽  
Impact Mitigation ◽  
Trade Offs

ABSTRACT Net Environmental Benefit Analysis (NEBA) and Spill Impact Mitigation Assessment (SIMA), a broader version of NEBA, are structured approaches used by response decision-makers and stakeholders during oil spill preparedness and response to compare available oil spill response options and identify those that have best potential to reduce environmental and socio-economic impacts and facilitate fastest recovery. The process comprises four stages: evaluate data, predict outcomes, balance trade-offs and select the best response options. This paper describes a case study of Spill Impact Mitigation Assessment conducted for shallow waters of North Caspian Sea. As a part of this analysis several steps were undertaken: - Environmental conditions in the area were characterized and critical environmental and socio-economic resources were identified;- Trajectory modeling was conducted for different seasons to evaluate oil fate and behavior with and without response techniques;- Impacts of a base scenario (no response) was compared to impacts of scenarios where different response techniques were used;- SIMA methodology was used to rank response techniques based on their ability to minimize environmental and socio-economic impacts;- Optimal combination of response options for each scenario was selected. This case study demonstrated how SIMA methodology could be applied even in challenging locations requiring careful analysis of environmental and socio-economic tradeoffs to ensure that selection of response strategies is supported by best available science.

scholarly journals Small Scales Dynamics Inferred from Tidal Measurements to Mitigate Daily Floodings in the City of Douala: A Case Study of the Besseke's Flood Drain

2020 ◽  
pp. 45-62
Author(s):  
Besack Felix ◽  
Onguene Raphael ◽  
Ebonji Seth Rodrigue ◽  
Oben Mbeng Lawrence ◽  
Kouandji Bekoumb Joseph Betsaleel ◽  
...  
Keyword(s):  
Brackish Water ◽  
Neap Tide ◽  
Spring Tide ◽  
Field Measurements ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Tidal Prism ◽  
Cross Sectional ◽  
Small Scales

The recently constructed Besseke’s flood drain is always filled with water due to individual or combined effect of the tide, urbanization drainage, underground plumes and precipitations runoffs. This study focused on the analysis of small scales dynamics inferred from short term tidal measurements to mitigate the daily flooding in the Besseke’s flood drain. The methodology used is based on field measurements observation. The sampling of water level was conducted during two (02) different tidal regimes in May 2019. The volume of brackish water moving in and out of the Besseke’s flood drain was calculated using the formula of O’Brien. The results showed that Spring conditions had greater amplitudes than Neap tide conditions. During Spring tides, the tidal prism that passed in the midsection of the Besseke’s flood drain (S4) was 3.5 × 101 m3. This means that only a negligible amount of the incoming brackish water reaches the Besseke’s flood drain, amplifies and causes the daily flooding. The unexpected stronger amplitudes and dynamics observed in S4 could be due to its sub estuary nature. Furthermore, the percentage composition of water in this section, showed that the fraction of brackish water changes from 85.7% during Spring tide to 77.8% in the Neap tide conditions. The overall spatial evolution revealed that, the trend in tidal prism (during Spring conditions) was (S0) > (S2) > (S1) > (S3) > (S4) with corresponding values of 2.1 × 104, 1.3 ×104, 1.0 × 104, 2.5 × 102 and 3.5 × 101 m3 respectively. Finally, Tidal prism and Cross-sectional area showed a perfect correlation (r2 = 0.96). The best fitted Cross-sectional area-Tidal prism relationship was obtained in S3 (Market) during Spring tide condition.

Using Stop Band Formation for Characterizing Interphase Properties of Composite Models Having Square Fiber Arrangements

1999 ◽  
Author(s):  
Liang-Wu Cai
Keyword(s):  
Physical Properties ◽  
Stop Band ◽  
Composite Model ◽  
Full Scale ◽  
Band Formation ◽  
Three Phase ◽  
Composite Models ◽  
Deterministic Simulations

Abstract The formation of stop bands over which waves cannot propagate through composites having square fiber arrangements has been observed in previous full-scale deterministic simulations. In this paper, characteristics of the cut-off frequency of the stop band are investigated via systematic full-scale simulations and related to the physical properties of the interphase in a three-phase composite model.

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