Indiana University-Purdue University Indianapolis (IUPUI) / Monitoring lake quality remotely offers an economically feasible approach as opposed to in-situ field data collection. Researchers have demonstrated that lake clarity can be successfully monitored through the analysis of remote sensing. Evaluating satellite imagery, as a means of water quality detection, offers a practical way to assess lake clarity across large areas, enabling researchers to conduct comparisons on a large spatial scale. Landsat data offers free access to frequent and recurring satellite images. This allows researchers the ability to make temporal comparisons regarding lake water quality. Lake water quality is related to turbidity which is associated with clarity. Lake clarity is a strong indicator of lake health and overall water quality. The possibility of detecting and monitoring lake clarity using Landsat8 mean brightness values is discussed in this report. Lake clarity is analyzed in three different reservoirs for this study; Brookeville, Geist, and Eagle Creek. In-situ measurements obtained from Brookeville Reservoir were used to calibrate reflectance from Landsat 8’s Operational Land Imager (OLI) satellite. Results indicated a correlation between turbidity and brightness values, which are highly correlated in algal dominated lakes.

Esta tese apresenta uma reflexão sobre a cidade contemporânea e o seu projeto, através da análise da contribuição teórico-projetual do urbanista italiano Bernardo Secchi. O recorte espaço-temporal é a Europa, com ênfase na Itália, a partir da década de 1980 até os dias atuais. No período, esse urbanista passou a contribuir ativamente com a publicação de textos em revistas, com pesquisas no Instituto Universitário de Arquitetura de Veneza (IUAV), e com a elaboração de planos e projetos, fazendo da cidade um grande laboratório. A produção de Secchi evidencia uma troca permanente entre pesquisa e experimentação, marcada pelo uso intencional de imagens como maneira de interpretar o mundo e de projetar a cidade. A pesquisa parte do conceito da renovatio urbis para a construção da cidade na cidade, indo até os dias atuais, marcados pela preocupação de transformar a cidade dispersa num território mais poroso. Analisam-se também os planos para várias cidades italianas, para a cidade de Antuérpia, além da participação no projeto para a Grand Pari(s). Convém destacar que a produção de Bernardo Secchi é acompanhada e analisada por décadas, a partir das produções teóricas e práticas, sendo os principais conceitos agrupados para compor as ideias-guias de cada período estudado, com o propósito de contribuir para uma reflexão dos caminhos e tendências do pensamento urbanístico contemporâneo. / This thesis presents a reflection on the contemporary city and its project through the analysis of the project-theoretical contribution of the Italian urban planner Bernardo Secchi. The temporal and spatial frame is Europe, emphasis on Italy, from the 80s to the present days. During this period Bernardo Secchi has actively contributed with publications in magazines, researches at the Venice University Institute of Architecture (IUAV), and elaboration of plans and projects turning the city into an important laboratory. Secchi production shows a permanent exchange between research and experimentation, represented by the intentional use of images as a way to interpret the world and plan the city. This thesis is based on the renovatio urbis concept for city construction in the city, until the present days, characterized by the concern of transforming the city dispersion into a more porous territory. The plans for several Italian cities and also for Antwerp are analyzed, besides the participation in the Grand Paris project. Bernardo Secchi production has been followed and analyzed for decades. The theoretical and practical production and the main concepts are put together in order to compose key ideas of each period under study, contributing to a reflection of ways and trends of the contemporary urban thought.

Esta tese apresenta uma reflexão sobre a cidade contemporânea e o seu projeto, através da análise da contribuição teórico-projetual do urbanista italiano Bernardo Secchi. O recorte espaço-temporal é a Europa, com ênfase na Itália, a partir da década de 1980 até os dias atuais. No período, esse urbanista passou a contribuir ativamente com a publicação de textos em revistas, com pesquisas no Instituto Universitário de Arquitetura de Veneza (IUAV), e com a elaboração de planos e projetos, fazendo da cidade um grande laboratório. A produção de Secchi evidencia uma troca permanente entre pesquisa e experimentação, marcada pelo uso intencional de imagens como maneira de interpretar o mundo e de projetar a cidade. A pesquisa parte do conceito da renovatio urbis para a construção da cidade na cidade, indo até os dias atuais, marcados pela preocupação de transformar a cidade dispersa num território mais poroso. Analisam-se também os planos para várias cidades italianas, para a cidade de Antuérpia, além da participação no projeto para a Grand Pari(s). Convém destacar que a produção de Bernardo Secchi é acompanhada e analisada por décadas, a partir das produções teóricas e práticas, sendo os principais conceitos agrupados para compor as ideias-guias de cada período estudado, com o propósito de contribuir para uma reflexão dos caminhos e tendências do pensamento urbanístico contemporâneo. / This thesis presents a reflection on the contemporary city and its project through the analysis of the project-theoretical contribution of the Italian urban planner Bernardo Secchi. The temporal and spatial frame is Europe, emphasis on Italy, from the 80s to the present days. During this period Bernardo Secchi has actively contributed with publications in magazines, researches at the Venice University Institute of Architecture (IUAV), and elaboration of plans and projects turning the city into an important laboratory. Secchi production shows a permanent exchange between research and experimentation, represented by the intentional use of images as a way to interpret the world and plan the city. This thesis is based on the renovatio urbis concept for city construction in the city, until the present days, characterized by the concern of transforming the city dispersion into a more porous territory. The plans for several Italian cities and also for Antwerp are analyzed, besides the participation in the Grand Paris project. Bernardo Secchi production has been followed and analyzed for decades. The theoretical and practical production and the main concepts are put together in order to compose key ideas of each period under study, contributing to a reflection of ways and trends of the contemporary urban thought.

A dissertação responde ao desafio de Bernard Secchi (2012), que afirma o urbanismo como um discurso, no qual se podem encontrar figuras de linguagem. Depois de apresentar as vantagens de interpretar essas figuras, Secchi revela que não é na cidade, mas no jardim, que talvez seja possível encontrá-las. O trabalho desenvolveu uma pesquisa sistemática, obedecendo ao tempo e à localização de exemplos significativos de espaços públicos e parques urbanos, o que permitiu a identificação de figuras do discurso paisagístico. A análise percorreu as vertentes francesa e inglesa e os parques referenciais brasileiros. As figuras e metáforas urbanas identificadas e interpretadas foram objeto de reflexão e também sinalizaram novas rotas de pesquisa. / This essay is a response to the challenge of Bernard Secchi (2012), who affirms that urbanism is a language in which one can find forms of speech. After presenting the advantages of interpreting these figures, Secchi concludes that it is not in the city, but in the garden where they are possibly to be found. This study followed a systematic method of research, considering criteria such as time and the location of significant examples of public spaces and urban parks, which allowed the identification of the aforementioned figures in landscaping. The analysis covered the French and English styles as well as specimen Brazilian parks of particular interest. The identified urban figures and metaphors were the object of further reflection and also led to new research routes.

Shallow lake wetlands, for which aquatic plants (macrophytes) and water clarity are the key indicators of ecological status, provide valuable services to wildlife and humanity. Conservation of these ecosystems requires development of rapid and large scale monitoring strategies, where remote sensing and Geographic Information Systems (GIS) can be advantageous. In this study, high spatial resolution Quickbird and IKONOS and medium spatial resolution Landsat and Aster images were used for monitoring the aquatic plants and water clarity in Lakes Mogan and Eymir. Classification of emergent plants with high spatial resolution data yielded overall accuracies greater than 90% for both lakes, while overall accuracies obtained from the medium spatial resolution data ranged between 80% and 93% for Lake Mogan and between 70% and 78% for Lake Eymir. It was found that there was 23ha reed bed loss in Lake Mogan between 2002 and 2005 and an additional 14ha was lost between 2005 and 2006. In Lake Eymir, no significant change in reed bed area was detected from high spatial resolution images / however medium spatial resolution images revealed 8ha of change which was attributed to the presence of mixed pixels due to low resolution. The overall accuracies for submerged plant coverage classification from Quickbird images in Lake Mogan were 83% (2005) and 79% (2006) and for classification of submerged plants species were 72% (2005) and 69% (2006). Moreover, it was found that blue band together with the ratio of red band to blue band, were the best predictors of Secchi disc depth.

A dissertação responde ao desafio de Bernard Secchi (2012), que afirma o urbanismo como um discurso, no qual se podem encontrar figuras de linguagem. Depois de apresentar as vantagens de interpretar essas figuras, Secchi revela que não é na cidade, mas no jardim, que talvez seja possível encontrá-las. O trabalho desenvolveu uma pesquisa sistemática, obedecendo ao tempo e à localização de exemplos significativos de espaços públicos e parques urbanos, o que permitiu a identificação de figuras do discurso paisagístico. A análise percorreu as vertentes francesa e inglesa e os parques referenciais brasileiros. As figuras e metáforas urbanas identificadas e interpretadas foram objeto de reflexão e também sinalizaram novas rotas de pesquisa. / This essay is a response to the challenge of Bernard Secchi (2012), who affirms that urbanism is a language in which one can find forms of speech. After presenting the advantages of interpreting these figures, Secchi concludes that it is not in the city, but in the garden where they are possibly to be found. This study followed a systematic method of research, considering criteria such as time and the location of significant examples of public spaces and urban parks, which allowed the identification of the aforementioned figures in landscaping. The analysis covered the French and English styles as well as specimen Brazilian parks of particular interest. The identified urban figures and metaphors were the object of further reflection and also led to new research routes.

A dissertação responde ao desafio de Bernard Secchi (2012), que afirma o urbanismo como um discurso, no qual se podem encontrar figuras de linguagem. Depois de apresentar as vantagens de interpretar essas figuras, Secchi revela que não é na cidade, mas no jardim, que talvez seja possível encontrá-las. O trabalho desenvolveu uma pesquisa sistemática, obedecendo ao tempo e à localização de exemplos significativos de espaços públicos e parques urbanos, o que permitiu a identificação de figuras do discurso paisagístico. A análise percorreu as vertentes francesa e inglesa e os parques referenciais brasileiros. As figuras e metáforas urbanas identificadas e interpretadas foram objeto de reflexão e também sinalizaram novas rotas de pesquisa. / This essay is a response to the challenge of Bernard Secchi (2012), who affirms that urbanism is a language in which one can find forms of speech. After presenting the advantages of interpreting these figures, Secchi concludes that it is not in the city, but in the garden where they are possibly to be found. This study followed a systematic method of research, considering criteria such as time and the location of significant examples of public spaces and urban parks, which allowed the identification of the aforementioned figures in landscaping. The analysis covered the French and English styles as well as specimen Brazilian parks of particular interest. The identified urban figures and metaphors were the object of further reflection and also led to new research routes.

Lakes are key indicators of environmental change and major repositories of biodiversity and ecosystem services. However, studies of lake response to drivers of change at a pan-European scale are exceptionally rare. The need for such studies has been given renewed impetus by concerns over climate change and because of international policyrelated schemes, such as the EU Water Framework Directive that has made it legal requirement to repeatedly assess and monitor the ecological status of European lakes toward their effective management and sustainable use. This has introduced the need for methods that can be widely applied across large spatial and temporal scales and produce comparable results. Remote sensing is a promising method for providing such information, but the spatial transferability and temporal repeatability of methods and relationships observed remains untested. In this project, an extensive dataset of field measurements was compiled covering temperature, chlorophyll a and Secchi disk depth in 23 European lakes spanning the last 30 years. The characteristics of these lake systems were explored and similarities in their ecological behavior identified, thus providing the basis for their grouping. Then the potential of remote sensing for estimating and monitoring lake water quality at wide spatial and temporal scales was assessed and thus the long remote sensing archive at the NEODAAS DSRS was fundamental for the purposes of this project. Using NOAA AVHRR, Terra/Aqua MODIS and field data from lakes that represented three main lake groups, the spatial and temporal reliability of 26 existing water quality estimation algorithms was assessed. Following this, the best performing algorithms were applied to all study sites and the effect of scale and spatial resolution upon reliable estimation of key water quality parameters was evaluated. It was demonstrated that the NOAA AVHRR and Terra/Aqua MODIS were both capable of producing highly accurate (R2 > 0.9) lake surface temperature estimates in lakes with variable characteristics and a variety of thermal spatial features, and longterm patterns within the study sites could be studied with NOAA AVHRR data despite the relatively coarse spatial resolution of the sensor. Restricting factors to the latter were the size and shape of lakes and the frequency of cloud cover. By contrast, the development of a universal Terra/Aqua MODIS algorithm for the estimation of chlorophyll a and Secchi disk depth in variable lakes was more challenging due to the optical complexity of Case II waters. Terra/Aqua MODIS data showed a potential, but the use of a different technique (e.g. multivariate regression or neural networks) and/or a different sensor (e.g. Envisat MERIS) could potentially improve the predictive accuracy of the algorithms.

ABSTRACT INVESTIGATION OF LIGHT ATTENUATION IN LAKE EYMIR Selen ATIKER M.Sc, Department of Environmental Engineering Supervisor: Assoc. Prof. Dr. Ayseg&uuml / l Aksoy Co-Supervisor: Assoc. Prof. Dr. Selim Sanin January 2012, 164 pages. Light penetration and attenuation has significant impact on the water quality of lakes. Algal activity, which is important for the levels of several water quality parameters, is dependent on light penetration besides availability of nutrients. In this study, change in light penetration and attenuation in Lake Eymir was studied. The relationships of extinction coefficient (ke), and water quality parameters were investigated. The effect of ke on Chl-a over nutrients were investigated. The water quality parameters measured were / total suspended solid (TSS), phosphate, ammonium, nitrate, photosynthetically active radiation (PAR), chlorophyll-a (Chl-a), Secchi disk depth and lake Depth. The measurements were conducted at five different stations in Lake Eymir. Secchi disk, PAR and lake depth measurements were done on site, while TSS, Chl-a and phosphate analyses were done in laboratory, using standard methods. Nitrate and ammonium analyses were conducted through laboratory kits. Linear and non-linear regression models of ke and Chl-a were developed to understand their relationships with the the measured parameters, using XLSTAT software. Analyses of the data at sampling stations revealed that Station 2 and 3 were the most representative stations in general. The model results indicated that ke is as important as nutrients for Chl-a abundance. Secchi disk and Chl-a are the most correlated parameters with ke. Moreover Secchi disk depth is nonlinearly correlated with ke, while linearly correlation is present between Chl-a and ke. &emsp

Earth observation satellites cover large areas with frequent temporal repetition and provide us with new insight into ocean and coastal processes. Ocean colour measurements from satellite remote sensing are linked to the bio-optics, which refers to the light interactions with living organisms and dissolved and suspended constituents in the aquatic environment. Human pressures have changed the aquatic ecosystems, by, for example, the increased input of nutrient and organic matter leading to eutrophication. This thesis aims to study and develop the link between bio-optical data and the remote sensing method to the monitoring and management of the Baltic Sea. The results are applied to the European Union’s Water Directives, and the Baltic Sea Action Plan from the Helsinki commission. In paper I indicators for eutrophication, chlorophyll-a concentration and Secchi depth were evaluated as a link to remote sensing observations. Chlorophyll-a measurements from an operational satellite service (paper I) were compared to conventional ship-based monitoring in paper II and showed high correlations to the in situ data. The results in paper I, II and IV show that the use of remote sensing can improve both the spatial and temporal monitoring of water quality. The number of observations increased when also using satellite data, thus facilitating the assessment of the ecological and environmental status within the European Union’s water directives. The spatial patterns make it possible to study the changes of e.g. algae blooms and terrestrial input on larger scales. Furthermore, the water quality products from satellites can offer a more holistic and easily accessible view of the information to decision makers and end-users. In paper III variable relationships between in situ bio-optical parameters, such as coloured dissolved organic matter (CDOM), dissolved organic carbon, salinity and Secchi depth, were found in different parts of the Baltic Sea. In paper IV an in situ empirical model to retrieve suspended particulate matter (SPM) from turbidity was developed and applied to remote sensing data. The use of Secchi depth as an indicator for eutrophication linked to the concentrations of chlorophyll-a and SPM and CDOM absorption was investigated in paper V. The variations in Secchi depth were affected differently by the mentioned parameters in the different regions. Therefore, one must also consider those when evaluating changes in Secchi depth and for setting target levels for water bodies. This thesis shows good examples on the benefits of incorporating bio-optical and remote sensing data to a higher extent within monitoring and management of the Baltic Sea. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript.</p>