scholarly journals Cold-Air Pool Processes in the Inn Valley During Föhn: A Comparison of Four Cases During the PIANO Campaign

2021 ◽  
Author(s):  
Maren Haid ◽  
Alexander Gohm ◽  
Lukas Umek ◽  
Helen C. Ward ◽  
Mathias W. Rotach
Keyword(s):  
Temporal Variability ◽  
Flow Instability ◽  
Heat Budget ◽  
Comprehensive Analysis ◽  
City Centre ◽  
The West ◽  
Cold Air ◽  
Spatio Temporal ◽  
Shear Flow Instability ◽  
The City

AbstractWe present a comprehensive analysis of four south föhn events observed during the Penetration and Interruption of Alpine Foehn (PIANO) field campaign in the Inn Valley, Austria, in the vicinity of Innsbruck. The goal is to detect and quantify processes of cold-air pool (CAP) erosion by föhn as well as processes of föhn breakdown. Despite differences in föhn breakthrough and strength, the four cases exhibit similarities in CAP evolution: initially, the CAP experienced strongest warming in the centre of Innsbruck, where the föhn jet from the Wipp Valley interacted with the CAP in the Inn Valley. The resulting shear-flow instability at the föhn–CAP interface caused turbulent CAP erosion and, together with vertical warm-air advection, led to CAP depression over the city centre. This depression drove pre-föhn westerlies near the surface that caused cold-air advection inside the CAP west of the city centre and warm-air advection in the east. Ultimately, the latter contributed to stronger CAP erosion in the east than in the west. This stronger heating also explains the preferential initial föhn breakthrough at the valley floor east of Innsbruck. In two of the cases, subsequent westward propagation of the föhn–CAP boundary across the city accompanied by northerly (deflected) föhn winds led to a complete föhn breakthrough. Föhn breakdown occurred either by a backflow of the CAP remnant or by a cold-frontal passage. This study emphasizes the importance of both turbulence and advection in the CAP heat budget and reveal their large spatio–temporal variability.

scholarly journals Spatio-Temporal Changes of Urban Forests and Planning Evolution in a Highly Dynamical Urban Area: The Case Study of Wrocław, Poland

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 17 ◽  
Author(s):  
Justyna Jaworek-Jakubska ◽  
Maciej Filipiak ◽  
Adam Michalski ◽  
Anna Napierała-Filipiak
Keyword(s):  
World War Ii ◽  
Urban Forest ◽  
Urban Forests ◽  
Spatial Dimension ◽  
Temporal Changes ◽  
City Centre ◽  
Socialist Economy ◽  
Urban Green Spaces ◽  
Spatio Temporal ◽  
The City

Knowledge about urban forests in Poland is still limited, as it is primarily based on aggregate, formal data relating to the general area, ignoring the spatial dimension and informal green areas. This article describes and analyses spatio-temporal changes in the actual urban forest resources in Wrocław in 1944–2017, which covers the first period of the city’s rebuilding after its destruction during World War II and its development during the nationalised, centrally-planned socialist economy, as well as the second period of intensive and only partly controlled growth under conditions of market economy. The study is based on current and historical orthophotomaps, which were confronted with cartographic data, as well as planning documents. We found that between 1944 and 2017, the percentage contribution of informal woodlands increased tenfold (from 0.5 to 4.9% of the present total area of the city). The area occupied by such forests has grown particularly during the most recent years of the city’s intensive development. However, the forests have been increasingly fragmented. During the first period, new forest areas were also created in the immediate vicinity of the city centre, while during the second one, only in its peripheral sections. The post-war plans regarding the urban green spaces (UGS), including the current plan, are very conservative in nature. On the one hand, this means no interference with the oldest, biggest, and most valuable forest complexes, but on the other hand, insufficient consideration of the intensive built-up area expansion on former agriculture areas. Only to a limited extent did the above-mentioned plans take into account the informal woodlands, which provide an opportunity for strengthening the functional connectivity of landscape.

scholarly journals Yachts Passing by the West Coast of Portugal – What to Do to Make the Marina and the Destination of Figueira da Foz a Nautical Tourism Reference?

Pomorstvo ◽  
2018 ◽  
Vol 32 (2) ◽  
pp. 182-190 ◽  
Author(s):  
Luís silveira ◽  
Norberto Santos ◽  
Fernando Perna
Keyword(s):  
Social Development ◽  
West Coast ◽  
City Centre ◽  
Delphi Panel ◽  
The West ◽  
Maximum Capacity ◽  
Tourist Destinations ◽  
The City

Yachting appears as a tourism segment with proven and specific importance for the economic and social development of tourist destinations Every year, thousands of yachts cross the Portuguese waters. Figueira da Foz is a seaside city and a destination with a history connected to tourism activities. Despite having a marina located in the city centre, the number of yachts stopping by is still far from this nautical port maximum capacity. As a reaction, and to change this reality, both local and regional stakeholders have participated in a Delphi panel to find out if yacht tourism has the potential to increase. It has been found that both the destination and its marina have the resources to attract and make this territory a nautical reference, and a strategy has been created. This model may serve as a basis for application in other nautical ports.

Two Geometric Tombs at Atsalenio near Knossos

1968 ◽  
Vol 63 ◽  
pp. 133-146
Author(s):  
Costis Davaras
Keyword(s):  
City Centre ◽  
Adjacent Area ◽  
The West ◽  
The Road ◽  
The North ◽  
The Earth ◽  
British School ◽  
Upper Level ◽  
The City

In the spring of 1962 workmen digging the foundation shafts for the construction of a house at Atsalenio hit upon two Geometric tombs. Atsalenio is a quarter outside Heraklion, midway between the city centre and Knossos. The site of the tombs, which is the property of the contractors, D. Ritsopoulos and D. Serdherakis, lies about 100 metres to the west of the road to Knossos and about 200 metres to the north of the modern graveyard of Atsalenio. As the tombs were just outside the Knossos area of the British School, although belonging to the Geometric cemeteries of Knossos, I undertook their excavation as Epimelete of the Archaeological Service.The site of the tombs, like most of the adjacent area, was a vineyard before building began, and the soil was cultivated to a depth of c. 0·7 m. This had destroyed the roofs of the tombs. The digging of the foundation shafts for the building had also destroyed all but the beginning of the dromos of Tomb A and had just reached the upper level of its burials before work was halted. Nearly all Tomb B, too, had been destroyed; the sherds from it were recovered for the most part from the earth thrown out by the builders.

scholarly journals Added Value of Vaisala AQT530 Sensors as a Part of a Sensor Network for Comprehensive Air Quality Monitoring

2021 ◽  
Vol 9 ◽  
Author(s):  
Tuukka Petäjä ◽  
Aino Ovaska ◽  
Pak Lun Fung ◽  
Pyry Poutanen ◽  
Jaakko Yli-Ojanperä ◽  
...  
Keyword(s):  
Air Quality ◽  
Urban Environment ◽  
Sensor Network ◽  
Temporal Variability ◽  
Trace Gases ◽  
Fine Tuning ◽  
Added Value ◽  
Wood Combustion ◽  
Spatio Temporal ◽  
The City

Poor air quality influences the quality of life in the urban environment. The regulatory observation stations provide the backbone for the city administration to monitor urban air quality. Recently a suite of cost-effective air quality sensors has emerged to provide novel insights into the spatio-temporal variability of aerosol particles and trace gases. Particularly in low concentrations these sensors might suffer from issues related e.g., to high detection limits, concentration drifts and interdependency between the observed trace gases and environmental parameters. In this study we characterize the optical particle detector used in AQT530 (Vaisala Ltd.) air quality sensor in the laboratory. We perform a measurement campaign with a network of AQT530 sensors in Helsinki, Finland in 2020–2021 and present a long-term performance evaluation of five sensors for particulate (PM10, PM2.5) and gaseous (NO2, NO, CO, O3) components during a half-year co-location study with reference instruments at an urban traffic site. Furthermore, short-term (3–5 weeks) co-location tests were performed for 25 sensors to provide sensor-specific correction equations for the fine-tuning of selected pollutants in the sensor network. We showcase the added value of the verified network of 25 sensor units to address the spatial variability of trace gases and aerosol mass concentrations in an urban environment. The analysis assesses road and harbor traffic monitoring, local construction dust monitoring, aerosol concentrations from fireworks, impact of sub-urban small scale wood combustion and detection of long-range transport episodes on a city scale. Our analysis illustrates that the calibrated network of Vaisala AQT530 air quality sensors provide new insights into the spatio-temporal variability of air pollution within the city. This information is beneficial to, for example, optimization of road dust and construction dust emission control as well as provides data to tackle air quality problems arising from traffic exhaust and localized wood combustion emissions in the residential areas.

scholarly journals El Castillo de La Atalaya (siglo XVIII), en Cartagena (Región de Murcia, España). Análisis formal y constructivo

X ◽  
2020 ◽  
Author(s):  
Federica Carta ◽  
Diego Ros McDonnell ◽  
Pedro Enrique Collado Espejo
Keyword(s):  
Eighteenth Century ◽  
Comprehensive Analysis ◽  
The South ◽  
The West ◽  
City Wall ◽  
Ground Plan ◽  
The North ◽  
The Military ◽  
The City

The Atalaya Castle (eighteenth century), in Cartagena (Region of Murcia, Spain). Formal and constructive analysisThe Atalaya Castle (eighteenth century) is one of the military fortifications that were part of the defense of Cartagena. The defensive system of the period was composed of an important walled enclosure, which surrounded the city, the arsenal, and a group of fortresses outside the city wall, located on the nearby hills. One of these defensive constructions is the Atalaya Castle or Fort, located to the west of the city from its position it protected the population from attacks both by land and by sea. To the north and west by land, through the Almarjal and the Pelayo mountains, the south by sea covered the possible landings in the bays of the Algameca Grande and the Algameca Chica. The building is a magnificently construction, the fort has a pentagon ground plan with five bastions at each angle. It has an interior building in U arranged on a solid bastioned platform the whole complex is surrounded by a dry moat. The fortification present certain formal elements used in other constructions that had been lifted in the city at that time, circumstance gave unity to the whole. The materials consisted of employed mainly stone and brick, the constructive elements introduce certain heterogeneity. The purpose of the communication is to present the results of the comprehensive analysis carried out in the Atalaya Castle as well as to contribute, through its dissemination to raise awareness of the need for its restoration and enhancement. Research has studied the characteristics of the formal and constructive system of the fortification currently in a state of semiabandonment, a proposal has also been conducted for a new cultural use as a guarantee of its correct recovery and conservation.

IV. The Etruscan City

1961 ◽  
Vol 29 ◽  
pp. 25-52
Author(s):  
J. B. Ward-Perkins
Keyword(s):  
Short Distance ◽  
Full Length ◽  
City Centre ◽  
The South ◽  
Natural Focus ◽  
The West ◽  
South Eastern ◽  
Natural Configuration ◽  
The City ◽  
The Town

About the internal topography of the Etruscan city we know sadly little. That it was very largely determined by the natural configuration of the ground there is little room for doubt. It is true that on the Piazza d'Armi Stefani found what may have been an open square with a straight street leading out of one corner of it and a second street running for a short distance at right angles to it. But the regularity of plan extends only a very short distance back from the main façade, and it bears all the marks of being a later rationalisation of an existing irregular plan; nor is there any suggestion of a regular layout elsewhere in the city. The main lines of the street-plan are clear enough, and these indicate a radial layout, with the city-centre occupying roughly the same site as the centre of the Roman town. This was, and still is, the natural focus of the plateau. Here the crest divides into two distinct ridges, the southern one running the full length of the promontory, right down to the Piazza d'Armi, the northern one bearing off to the left and then swinging right again towards the modern Casale Cabrioli, ending on the cliffs overlooking the Fosso della Valchetta, opposite the Vacchereccia tumulus. The layout of the south-eastern part of the town was very largely determined by the course of the roads which followed these two ridges and of a third road which probably ran down the bottom of the valley between them. Two other roads, those from the Formello and the Millstream Gates, converge directly on the centre, and that from the Capena Gate joined the northern ridge-road about 500 m. to the east. The Caere road probably joined the axial road some distance to the west of the centre.

scholarly journals Biking Acculturation Incidence on the Cameroon Urban Activity Fluxes: A Traffic Congestion Panacea or Palliative in Bamenda?

2020 ◽  
Vol 4 (1) ◽  
pp. 40
Author(s):  
Zephania N. Fogwe
Keyword(s):  
Traffic Congestion ◽  
Urban Transportation ◽  
Urban Transport ◽  
Transport Systems ◽  
City Centre ◽  
Vehicular Traffic ◽  
Urban Problem ◽  
Spatio Temporal ◽  
The City ◽  
Urban Activity

City activity fluxes are reminiscent of stakeholder mobility in the urban sphere service and functions. Such mobility affects income and work assiduity though often creating accidents, material damage and pollution of varied forms of urban transportation that has lately witnessed the adaption to motorbikes as an alternatively favoured means of movement to that car. Salvaging economic depression and affordability has given biking an edge of success of recent which raises the recurrent question of its spatio-temporal and technical sustainability in in the freight sector. This paper evaluates the commercialisation of bike riding despite levied negativism perceptions in providing an alternative to the major urban problem of traffic congestion and its contribution to peter the pitfalls of the congestion. To assess the urban congestion intensity, traffic flow count was conducted during the rainy and dry season of spatio-temporal of vehicles (from the city centre to the suburbs). Findings agree to the fact that vehicular traffic congestion with increasing number of bikes was found to be higher along the N-E than the N-W road axis in direct conformity with sampled urban congestion triggers for Bamenda related to road infrastructural traits and vehicular numbers. Though motor bikes initially were a panacea, the sum effect of congestion reveals the urgent need for urban mass transport systems that should be complemented by a holistic urban transport governance involving the creation of deviation routes and enforcing traffic congestion rules.

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