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Search Results: 1 - 10 of 10712 matches for " Catarina Ramos "
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Cheias e escassez de água no Alto Alentejo. O exemplo da Bacia Vertente da Ribeira de Tera
Catarina Ramos
Finisterra - Revista Portuguesa de Geografia , 1995,
Abstract: FLOODS AND DRYNESS IN ALENTEJO. THE CASE OF THE DRAINAGE BASIN OF RIBEIRA DE TERA (PORTUGAL) - The drainage basin of Ribeira de Tera belongs to the Hydrographic Basin of the River Tagus, and it is located in one of the driest areas of Portugal: Alentejo.The geological formations of the drainage basin have a very reduced permeability, resulting in drastically worsening of the consequences of low and irregular rainfall. The drainage basin is much affected by the dryness, since the rainfall is absent during more than 3/4 of the days of the year and, for more than half of the years (58%), the precipitation does not even reach 700 mm/year. Every stream of the drainage basin is therefore temporary, including its main channel, which stays dry an average of 133 days/year.The early 70's mark a change in the stream's behaviour. The fluvial discharges have been decreasing, and the drought continues throughout the Autumn. The number of flood days is decreasing distinctly, but the flood's magnitude has increased, due to the decrease of floods with low peak flows. These changes in the fluvial regime are directly connected with the precipitation decrease trend and with the construction of dozens of small-sized dams in an attempt to retain the water for irrigation and for the cattle. These small-sized dams are empty by the end of the Summer and they retain the water from the small Autumn floods.The carbonated metamorphic formations occupy 4% of the area of the drainage basin. They constitute its aquifer reservoir. These rocks, together with the volcanic metamorphic ones, supply 65% of the springs of the drainage basin. This aquifer is exposed to great anthropic pressure, not only because it supplies several human activities which develop around the most important population nucleus of the drainage basin (City of Estremoz), but also because it supports one of the rare industries in the region: the marble extraction.From the environemental point of view, the activity of the quarries has a rather negative impact, because it is destroying the only aquifer reservoir in a region very poor in water resources (either superficial or underground); from the economical and social points of view, the decrease in quarry activity is almost unthinkable due to the value of the marble exported as of ornamental rocks and, mainly, because it is one of the rare industries in a region facing severe unemployment prloblems.
Carlos Alberto Medeiros - O Professor: testemunho de uma discípula
Catarina Ramos
Finisterra - Revista Portuguesa de Geografia , 2005,
Abstract:
A influência das situa es anticiclónicas no regime da percipita o em Portugal
Catarina Ramos
Finisterra - Revista Portuguesa de Geografia , 1987,
Abstract:
Posttraumatic Growth in the Aftermath of Trauma: A Literature Review About Related Factors and Application Contexts
Catarina Ramos,Isabel Leal
Psychology, Community & Health , 2005,
Abstract: Aim: In the face of one traumatic event, individuals may perceive, along with the inherent negative responses, a number of positive changes, which reveal posttraumatic growth. This concept has increased its expression in literature over the years, and it has been recognized that people exposed to highly traumatic events, such as bereavement, war combat, disasters, disease or other stressful or life-threatening events, may perceive positive changes from the struggling with those events. Thus, this literature review aims at exploring the definition of posttraumatic growth, associated factors and application contexts. Method and Results: Electronic databases were used to search the relevant literature. Based on the analysis of empirical data, were found several studies that demonstrated a range of factors, such as distress, personality characteristics, self-disclosure, coping, social support, environmental characteristics, assumptive world, rumination, spirituality and optimism, that have contributed to the development of posttraumatic growth; however, some relationships remain inconclusive. Conclusion: Further research is required, to clarify the genesis and the development of posttraumatic growth, also, to extend the posttraumatic growth studies in health context, encompassing the patient as well as family and social network.
Inunda es na Cidade de Lisboa durante o Século XX e os seus factores agraventes
Pedro Elias Oliveira,Catarina Ramos
Finisterra - Revista Portuguesa de Geografia , 2002,
Abstract: INUNDATIONS IN LISBON DURING THE 20TH CENTURY AND THEIR URBANAND PHYSICAL CAUSES. Lisbon often suffers inundations, which must be classified as urban inundations, because the flooded areas involved are impermeable due to urban development. These inundations are not related to the overflow of watercourses, but can be classified as flash inundations because of the speed with which they form and spread. The present study covers a time period from 1918/19 to 1997/98, during which 420 occurrences were recorded in two leading daily newspapers, O Século and Diário de Notícias . The research based on these newspapers takes into account daily rainfalls above 10 l/m2 recorded by the Instituto Geofísico Infante D. Luís, as well as daily rainfall below this level but that have also caused inundations. The analysis of the frequency and evolution of these inundations has showed that they occur more often during the autumn (specially in November) and that from the seventies onwards, they have decreased considerably, while at the same time the total rainfall volume has increased, as well as the maximum hourly rainfall that bring them about. Fieldwork was very important in the definition of flooded sites. Research was carried out to specify the physical factors (relief and drainage basins) and urban network (squares and streets). The relationship between these urban factors and the old drainage network was also taken into account in order to distinguish increasing inundation factors. Apart from the description of the physical characteristics of these sites, they were also typified through factor analysis. A hazard factor was attributed to each site based on inundation frequency. The most endangered areas and sites are located mainly in the Frente Ribeirinha (along the river bank) built upon the terminal sectors of the natural watercourses, which consists of the receptor streets and receptor squares of the flow. These streets and squares lie perpendicular to the ancient watercourses, and in places where artificial barriers and micro depressions exist. The latter result from the artificial surface of the riverside embankment. Other critical sites exist throughout the town mainly because of obstruction problems or deficient drainage systems, often aggravated, by newly built up impervious areas.
As cheias no sul de Portugal em diferentes tipos de bacias hidrográficas
Catarina Ramos,Eusébio Reis
Finisterra - Revista Portuguesa de Geografia , 2001,
Abstract: THE FLOODS IN THE SOUTH OF PORTUGAL IN DIFFERENT KINDS OF DRAINAGEBASINS – The regime of the Portuguese rivers depends on the space and time variation of rainfall. Portugal has clear regional contrasts in the geographical distribution of rainfall. The NW and the Central Mountain Range (Cordilheira Central) are the regions with more rainfall. The NE and the south are the driest regions. Therainfall regime is very irregular. The monthly rainfall regime is clearly Mediterranean with autumn-winter rains (November-March) and an extremely dry summer. The river flows are also very irregular, with severe droughts and surprisingly high flood discharges. These characteristics tend to worsen from NW to SE. The southern rivers have specific discharges 6 to 7 times inferior to the ones of theNW, greater irregularity (the flow in years with more rainfall may surpass 100 to 240 times the flow in driest years), a more severe drought (6 months), almost all are temporary, and flood peaks (200-300 times the average flow) can reach extremely high values.In the twentieth century, floods were responsible for the highest rate of casualties in natural disasters in Portugal, followed by earthquakes: one death for every seven were due to floods. The type of floods known as progressive floods mainly affects the big hydrographic basins, such as the River Tagus basin, due to the large flooded area. This kind of flood is caused by heavy rainfall periods connected to the western zonal circulation, which usually lasts several weeks. The dams’ basin system reduces flood frequency, especially in autumn when reservoirs still manage to absorb the highflows after the summer dry period, but cannot tame the river. It has even contributed to an increase of the peak flow, as in the 1979 flood. Flashfloods are another kind of floods that occur in Portugal and, unlike the former, are dangerous and deadly, such as those in 1967, 1983 and 1997. They affect the small drainage basins and are caused by heavy and concentrated rainfalls, due to convective depressions (cold pools especially active or depressions caused by the interaction between polar and tropical circulations), namely in the south of the country (Lisbon region, Alentejo and Algarve). In the small drainage basins with a natural regime (uninfluenced by a dam), it is interesting to verify the existence of a trend in these extreme phenomena over the last decades. There has been a clear intensification of flood importance during autumn months, in contrast with an accentuated diminishing in winter and spring months.This trend concerns us
Um índice climático de perigo de incêndio aplicado aos fogos florestais de Portugal
Catarina Ramos,José Eduardo Ventura
Finisterra - Revista Portuguesa de Geografia , 1992,
Abstract:
Uma conferência internacional sobre os fogos florestais
Catarina Ramos,José Eduardo Ventura
Finisterra - Revista Portuguesa de Geografia , 1990,
Abstract:
A Reserva Ecológica Nacional (REN): sua importancia para o ambiente e ordenamento do território
Ana Ramos Pereira,Catarina Ramos,Manuela Laranjeira
Finisterra - Revista Portuguesa de Geografia , 2000,
Abstract: THE NATIONAL ECOLOGICAL RESERVE (REN): ENVIRONMENT AND MANAGEMENT IMPLICATIONS. The National Ecological Reserve (REN) defined in Decree-Law 93/90 of March 5th is the basic and diversified biophysical structure that guarantees environmental protection, through the creation of restricted areas at rish through erosion (littoral or slope), flooding and aquifer recharge. The REN valuation, whose main aspects are referred to here, was carried out by means of an analysis of Municipal Master Plans (PDM) and a survey sent to all local authorities. As it was impossible to analyse the PDM of every district, a dis- trict differentiation was completed based on the biophysical index (Fig. 1 and 2), subsequently crossed by the district human pressure to obtain the district spatial differentiation of the environmental strain (Fig. 3). This allowed a standard district to be selected where the REN was analysed in full detail (Fig. 4 to 9). The survey allowed for the evaluation of the main conflicts in other districts between the REN and the goals of the PDM to be assessed, including the issues concerning the delimitation and the way the REN is seen by the councils and the citizens. The REN includes physical and biophysical systems (slope, fluvial, aquifer and littoral) that tend never to coincide with the administrative divisions. It is urgent that a national network be created of REN areas, planned and managed through more integrated means and an inter-municipal collaboration that can only be effective if environmental education is promoted, on both formal and informal terms.
Two Notch Ligands, Dll1 and Jag1, Are Differently Restricted in Their Range of Action to Control Neurogenesis in the Mammalian Spinal Cord
Catarina Ramos,Susana Rocha,Claudia Gaspar,Domingos Henrique
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015515
Abstract: Notch signalling regulates neuronal differentiation in the vertebrate nervous system. In addition to a widespread function in maintaining neural progenitors, Notch signalling has also been involved in specific neuronal fate decisions. These functions are likely mediated by distinct Notch ligands, which show restricted expression patterns in the developing nervous system. Two ligands, in particular, are expressed in non-overlapping complementary domains of the embryonic spinal cord, with Jag1 being restricted to the V1 and dI6 progenitor domains, while Dll1 is expressed in the remaining domains. However, the specific contribution of different ligands to regulate neurogenesis in vertebrate embryos is still poorly understood.
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