scholarly journals An integrated approach for wind fields assessment in coastal areas, based on bioindicators, CFD modeling, and observations

2015 ◽  
Vol 128 (1-2) ◽  
pp. 301-310 ◽  
Author(s):  
Bruno M. Meneses ◽  
António Lopes
Keyword(s):  
Integrated Approach ◽  
Coastal Areas ◽  
Cfd Modeling ◽  
Wind Fields

An Integrated Approach to Simulate Gas Turbine Secondary Air System

2020 ◽  
Author(s):  
Ali Izadi ◽  
Seyed Hossein Madani ◽  
Seyed Vahid Hosseini ◽  
Mahmoud Chizari
Keyword(s):  
Heat Transfer ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Great Influence ◽  
Integrated Approach ◽  
Cfd Modeling ◽  
Connectivity Matrix ◽  
Analysis Tool ◽  
Air System ◽  
Secondary Air

Abstract One of the most critical parts of a modern gas turbine that its reliability and performance has a great influence on cycle efficiency is the secondary air system (SAS). Modern systems functions to supply not only cooling air flow for turbine blades and vanes but sealing flow for bearing chambers and turbine segments as well as turbine disks’ purge flow in order to eliminate hot gas ingestion. Due to the various interactions between SAS and main gas, consideration of the former is substantially crucial in design and analysis of the whole engine. Geometrical complexities and centrifugal effects of rotating blades and disks, however, make the flow field and heat transfer of the problem so complicated AND too computationally costly to be simulated utilizing full 3-D CFD methods. Therefore, developing 1-D and 0-D tools applying network methods are of great interests. The present article describes a modular SAS analysis tool that is consisted of a network of elements and nodes. Each flow branch of a whole engine SAS network is substituted with an element and then, various branches (elements) intersect with each other just at their end nodes. These elements which might include some typical components such as labyrinth seals, orifices, stationary/rotating pipes, pre-swirls, and rim-seals, are generally articulated with characteristic curves that are extracted from high fidelity CFD modeling using commercial software such as Flowmaster or ANSYS-CFX. Having these curves, an algorithm is developed to calculate flow parameters at nodes with the aid of iterative methods. The procedure is based on three main innovative ideas. The first one is related to the network construction by defining a connectivity matrix which could be applied to any arbitrary network such as hydraulic or lubrication networks. In the second one, off-design SAS calculation will be proposed by introducing some SAS elements that their characteristic non-dimensional curves are influenced by their inlet total pressure. The last novelty is the integration of the blades coolant calculation process that incorporates external heat transfer calculation, structural conduction and coolant side modeling with SAS network simulation. Finally, SAS simulation of an industrial gas turbine is presented to illustrate capabilities of the presented tool in design point and off-design conditions.

Wind fields from COSMO-SkyMed and RADARSAT-2 SAR in coastal areas

2015 ◽  
Author(s):  
S. Zecchetto ◽  
F. De Biasio ◽  
A. Della Valle ◽  
A. Cucco ◽  
G. Quattrocchi ◽  
...  
Keyword(s):  
Coastal Areas ◽  
Wind Fields

scholarly journals Technology Applications Based Ecosystem Conservation in The Beach Basaan, Southeast Minahasa Regency , North Sulawesi

2014 ◽  
Vol 2 (2) ◽  
pp. 85
Author(s):  
Adnan S. Wantasen
Keyword(s):  
Capacity Building ◽  
Integrated Approach ◽  
Coastal Areas ◽  
Small Scale ◽  
Environmental Damage ◽  
Coastal Resources ◽  
Building Society ◽  
Alternative Employment ◽  
Use Of Resources

In fact the use or the use of resources and territory or coastal area showed a significant rate. Yet on the other hand the availability of space and resources are in a dilemma because the rate is followed by the use of more that do not consider the sustainability of the resource. It is crucial to increase with increasing population. One of the consequences or impact most noticeably is the damage to the environment, both natural environment in general and specifically the environment of coastal areas. From various studies and concern, for while the environmental damage that occurs in the context of use (exploitation) of natural resources because of: 1) Lack of or perhaps the lack of an integrated approach to the planning and management of resources that are in the coastal region; 2) Lack of adequate information and data to be used as a reference in the management; 3) Lack of community involvement in the management of local government may hoarse coastal power. Management of small -scale coastal resources is an activity in the village / urban neighborhoods implemented as an effort of institutional capacity building and community, improving the quality of the environment, as well as socio-economic improvement of the quality of society by using technology appropriate management of coastal areas for the community. These activities are grouped into 3 categories: 1. Capacity building society in the management of coastal and marine resources through training and mentoring, 2. Environmental improvement activities that influence the activities in improving welfare, 3. The development of alternative employment Keywords : Coastal resources , utilization strategy and management activities ABSTRAK Pada kenyataannya pemanfaatan atau penggunaan sumberdaya dan wilayah atau ruang pesisir menunjukkan laju yang signifikan. Padahal di sisi lain ketersediaan ruang dan sumber daya tersebut berada dalam laju yang dilematis karena diikuti toleh pemanfaatan lebih yang tidak mempertimbangkan keberlanjutan dan kelestarian sumber tersebut. Hal ini bertambah krusial dengan bertambahnya jumlah penduduk. Salah satu akibat atau dampak yang paling terasa adalah kerusakan lingkungan, baik lingkungan alam secara umum maupun lingkungan wilayah pesisir secara khusus. Dari berbagai kajian dan kepedulian, untuk sementara kerusakan lingkungan yang terjadi dalam konteks pemanfaatan (eksploitasi) sumber daya alam oleh karena : 1)Kurangnya atau mungkin tidak adanya suatu pendekatan yang terpadu dalam perencanaan dan pengelolaan sumber daya yang berada dalam kawasan pesisir; 2)Kurangnya informasi dan data yang layak untuk dijadikan acuan dalam pengelolaan; 3)Kurangnya keterlibatan masyarakat dan mungkin pemerintah daerah dalam pengelolaan sember daya pesisir. Untuk berbagai alasan dan pertimbangan tersebut di atas, maka perlu diterapkan strategi pemanfaatan dalam batas-batas ramah lingkungan, melindungi dan mengkonservasi wilayah tertentu, merehabilitasi wilayah yang rusak, serta  meningkatkan kesadaran masyarakat pesisir untuk melestarikan ekosistem pesisir,  yang terintegrasi dalam strategi pengelolaan wilayah pesisir terpadu. Pengelolaan sumberdaya wilayah pesisir skala kecil adalah suatu kegiatan pada tingkat desa/kelurahan yang dilaksanakan sebagai upaya dari kegiatan peningkatan kapasitas kelembagaan dan masyarakat, peningkatan kualitas lingkungan, serta peningkatan kualitas sosial ekonomi masyarakat dengan menggunakan teknologi pengelolaan wilayah pesisir tepat guna bagi masyarakat.  Kegiatan ini dikelompokkan menjadi 3 kategori yaitu: 1.Kegiatan peningkatan kapasitas masyarakat dalam pengelolaan sumberdaya pesisir dan laut melalui pelatihan dan pendampingan, 2.Kegiatan perbaikan lingkungan yang mempengaruhi kegiatan dalam peningkatan kesejahteraan, 3.Kegiatan pengembangan mata pencaharian alternatif.   Kata kunci : Sumberdaya pesisir, strategi pemanfaatan dan kegiatan pengelolaan 1Staf pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi

scholarly journals The Mediterranean coastal areas from watershed to the sea: interactions and changes

2007 ◽  
Keyword(s):  
European Commission ◽  
Information Flow ◽  
Sustainable Management ◽  
Integrated Approach ◽  
Coastal Areas ◽  
Coastal Zones ◽  
Multidisciplinary Research ◽  
River Catchment ◽  
International Conference ◽  
Catchment Areas

This volume presents the Proceedings of the International Conference of the MEDCORE project held in Florence, Italy, in November 2005. The MEDCORE project "From river catchment areas to the sea: a comparative and integrated approach to the ecology of Mediterranean coastal zones for sustainable management", funded by the European Commission, was carried out from 2002 to 2005 by a consortium of researchers from European and Mediterranean partner countries. It focused on coastal areas, with particular attention to the interactions and links between the elements. The approach was characterised by multidisciplinary research and integration of expertise. This book contributes to the information flow originated by the project and the conference. Despite the variety of the contributions, they have been gathered into this single volume to construct a baseline for an innovative interdisciplinary perspective.

Numerical Modeling of Tropical Cyclone Generated Waves; Case studies of Irma, Maria and Dorian

2020 ◽  
Author(s):  
Gozde Guney Dogan ◽  
Pamela Probst ◽  
Bora Yalciner ◽  
Alessandro Annunziato ◽  
Narcisse Zahibo ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Tropical Cyclone ◽  
Atlantic Ocean ◽  
Tropical Cyclones ◽  
Storm Surge ◽  
Coastal Areas ◽  
Wind Fields ◽  
Caribbean Islands ◽  
The Caribbean

<p>Tropical cyclones can be considered one type of extreme event, with their destructive winds, torrential rainfall and storm surge. Every year these natural phenomena affect millions of people around the world, leaving a trail of destruction in several countries, especially along the coastal areas. Only in 2017, two devastating major hurricanes (Irma and Maria) moved across the Caribbean and south-eastern USA, causing extensive damage and deaths. Irma formed in the far eastern Atlantic Ocean on 30 August 2017 and moved towards the Caribbean islands during the following week, significantly strengthening, becoming a Category 5 Hurricane. It caused wide-ranging impacts such as significant storm surge (up to 3m according to US National Oceanic and Atmospheric Administration, NOAA report) to several islands in the Caribbean and Florida. On the second half of September, 2017, another strong Category 5 Hurricane named Maria formed over the Atlantic and moved west towards the Caribbean Sea. Maria also caused several impacts and severe damage in Caribbean Islands, Puerto Rico and the U.S. Virgin Islands due to high speed winds, rainfall, flooding and storm surge with a maximum runup of 3.7 m (US NOAA) on the southern tip of Dominica Island. The most recent devastating event for the Atlantic is Hurricane Dorian. It formed on August 24, 2019 over the Atlantic Ocean and it moved towards the Caribbean islands, as getting stronger as moving, becoming a Category 5 before reaching the Bahamas, where it left a trail of destruction after its passage. The major effect of Dorian was on north-western Bahamas with very strong winds, heavy rainfall and a large storm surge.</p><p>In this context, a rapid and reliable modeling of storm surge generated by such kind of events is essential for many purposes such as early accurate assessment of the situation, forecasting, estimation of potential impact in coastal areas, and operational issues like emergency management.</p><p>A numerical model, NAMI DANCE GPU T-SS (Tsunami-Storm Surge) is developed building up on tsunami numerical model NAMI DANCE GPU version to solve nonlinear shallow water equations, using the pressure and wind fields as inputs to compute spatial and temporal distribution of water level throughout the study domain and respective inundation related to tropical cyclones, based on the equations used in the HyFlux2 Code developed by the Joint Research Centre of the European Commission. The code provides a rapid calculation since it is structured for Graphical Processing Unit (GPU) using CUDA API.</p><p>NAMI DANCE GPU T-SS has been applied to many cases as regular shaped basins under circular static and dynamic pressure fields separately and also different wind fields for validation together with combinations of pressure and wind fields. This study has been conducted to investigate the potential of numerical modeling of tropical cyclone generated storm surge based on recent events Irma, Maria and Dorian. The results are presented and discussed based on comparison with the measurements and observations. The study shows promise for developing a cyclone modeling capability based on available measurement and observational data.</p>

scholarly journals SPECIAL FEATURES OF MANAGEMENT OF THE COASTAL AREA DEVELOPMENT: FOREIGN EXPERIENCE

2017 ◽  
Vol 21 (6) ◽  
pp. 103-111
Author(s):  
E. S. Arumova ◽  
M. A. Bitarova
Keyword(s):  
Sustainable Development ◽  
Natural Resources ◽  
Environmental Protection ◽  
Coastal Area ◽  
Rapid Development ◽  
Integrated Approach ◽  
Coastal Areas ◽  
Economic Activities ◽  
Foreign Experience ◽  
Economic Nature

Due to their natural resources the coastal areas are one of the most populated and exploited places on earth. Economic activities are carried out in such areas most actively, as they have a special appeal for humans. The advantages of coastal areas provide an opportunity to implement a variety of economic activities, and also determine their potential for development. However, active economic activities in coastal areas, in most cases, contribute to environmental degradation and leads to depletion of natural resources, and as a result, may cause a loss of the capacity for sustainable development of coastal areas. In this regard, it is these territories that have the most acute environmental protection issues, as a result of man-induced impact on coastal areas. The given paper considers foreign experience of management of coastal areas development through an integrated approach which is the main vector of the territory development. The studied foreign experience revealed that an integrated approach to coastal area management as a tool for sustainable development can change the attitude of people to the environmental problem, as the balance between tourism and environmental protection promotes the conservation of natural resources. At present, problems arising from the rapid development of economic activities in coastal areas, faced by management structures at all levels require timely decisions based on the concept of sustainable development. In this study, the authors found out that one of the factors of sustainable development of coastal areas is an ecological and social development, which is seen as closely interrelated aspects, not as separate directions of sustainable development. Currently, you need to create a management system for coastal territories, based on continuous planning and monitoring with regard to the specific features and problems of natural, human and socio-economic nature of such areas.

scholarly journals Application of an Integrated Approach to Study Flooding in Coastal Areas

2021 ◽  
Vol LVIII (3) ◽  
Author(s):  
J. N. Pan ◽  
V. Penchev ◽  
J. S. Zhang ◽  
J. H. Wang ◽  
D. Dragancheva ◽  
...  
Keyword(s):  
Integrated Approach ◽  
Coastal Areas

scholarly journals Framework for improving land boundary conditions in regional ocean products

2020 ◽  
Author(s):  
Francisco Campuzano ◽  
Flávio Santos ◽  
Ana Isabel Ramos de Oliveira ◽  
Lucian Simionesei ◽  
Rodrigo Fernandes ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Coastal Area ◽  
Thermohaline Circulation ◽  
State Of The Art ◽  
Integrated Approach ◽  
Source Model ◽  
Coastal Areas ◽  
Human Consumption ◽  
Wide Range ◽  
Ocean Models

<p>Currently hydrological models are not generally coupled to coastal and regional ocean models because, even if regarded as a powerful and useful tool, they do not fully accomplish to estimate accurately the right volume of water reaching the coastal zone for many reasons including water management activities such as human consumption, irrigation, etc. For this reason, many coastal and ocean models continue to use river climatologies as boundary conditions for representing such an active boundary. Furthermore, continuous salinity observations in the coastal area are scarce and sensors are highly unreliable while current Earth Observation (EO) products for salinity poorly represents the coastal gradients.</p><p>In this presentation, the current state-of-the-art and the results of the LAMBDA Project (λ) (LAnd-Marine Boundary Development and Analysis) will be shown. The main aim of the project was to demonstrate an improvement in the thermohaline circulation in coastal areas by a better characterisation of the land-marine boundary conditions, with special regard to the salinity fields. The LAMBDA project analysed the opportunity of improving the land-marine boundary conditions by exploring the capacities of state-of-the-art hydrologic models. In order to achieve those objectives, the project strategy used an integrated approach that went from watershed models to validation in the coastal area by fit-for-purpose EO products, developed by SMOS, and passing through methods and proxies for integrating the freshwater flows into regional mesoscale grids. The watershed and estuarine proxies were modelled using the MOHID Water modelling system (http://www.mohid.com/) an open source model capable of simulating a wide range of processes, i.e. hydrodynamics, transport, water quality, oil spills, in surface water bodies (oceans, coastal areas, estuaries and reservoirs).</p><p>The project products were evaluated in Portugal Continental waters, tested in CMEMS regional products and evaluated by local experts in Germany, Ireland, Portugal, UK and Spain.</p>

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