Uppsatsen är en jämförande studie av Svindlande höjder och Twilight-serien avseende verkens huvudkaraktärer Catherine och Heathcliff respektive Bella och Edward. Syftet med uppsatsen är att undersöka om, och i så fall vilka likheter det finns mellan dessa två verks huvudkaraktärer. Karaktärerna jämförs ur ett antal utvalda perspektiv och slutsatsen är att det finns flera betydande likheter.

Thesis (M.S.)--University of Tennessee, Knoxville, 2002. / Title from title page screen (viewed Sept. 4, 2002). Thesis advisor: David S. Buckley. Document formatted into pages (xi, 112 p.). Vita. Includes bibliographical references (p. 104-111).

In this thesis I investigate what ‘authenticity’ means in a contemporary popular context and how it is used in the staging of bodies. Furthermore, I analyse works of dance and fashion from the past fifteen years with a focus on their strategies of challenging the notion of ‘bodily authenticity’.   When ‘an authentic body’ is sought by participants or demanded by judges and ‘experts’ on popular makeover and casting TV shows such as The Swan (Fox 2004) or Germany’s Next Topmodel (Pro 7 2006-present) this refers to the physical visualisation of what is perceived/presented as the participants ‘inner self’. I scrutinise the staging techniques and the codes of appearance that bodies have to comply with in order to be deemed ‘authentic’ on the shows. To define them and place them in the history of the idea of ‘bodily authenticity’, I complement my study with an outline of how ‘authenticity’ was understood in the Enlightenment and what techniques were used to stage the body when the concept gained currency, for instance in the writings of Rousseau. My analysis makes clear that 'bodily authenticity' on the two TV shows is achieved by strictly following gender-normative codes of beauty and by a depiction of 'working hard'. But various techniques also mask the hard work, for example by showing a participant ‘having fun’ performing it.   Contemporary works of dance and fashion challenge the problematic implications in the notion of ‘bodily authenticity’. I analyse three strategies of undermining the ‘authentic’ ideal in a total of seven pieces. These strategies are hyperbole which exaggerates the beauty code implicit in ‘authentic appearance’; multiplicity which undermines ‘authenticity’s’ essentialism and estrangement which denies the notion of individual authorship. In conclusion, I place the staging strategies used in my examples in a wider cultural context and highlight potential problems inherent in their critiques. / <p>Thesis is done in ’co-tutelle’ with Freie Universität Berlin. </p>

The effects of differential irrigation treatments on the water use of broccoli (c.v. Indurance) and carrots (c.v. Stefano) were studied in the rainy, winter season from July to September 2006 and in the dry, summer period from November 2006 to March 2007, respectively. Broccoli and carrots are produced on the Swan Coastal Plain region on Grey Phase Karrakatta Sand. Such soils generally have water holding capacities as low as 10 to 13%. This soil is typical to the Swan Coastal Plain and requires irrigation to be applied at rates of up to 150% of class A pan evaporation (Epan) to optimise growth and quality. / High spatial uniformity (an average of 90%) of water distribution (DU) was achieved with the sprinkler irrigation system. The average irrigation water use efficiencies (Eu) in both the experiments were relatively high, at 78% and 95% in broccoli and carrot trials, respectively. The numerous rainy days during the winter season affected the results of water application efficiencies (Ea) of the broccoli experiment, which ranged from 35% to 43%. This contrasted with the carrot experiment where the water application efficiencies (Ea) of the 100% Epan and Crop Factor (CF) treatments were 81% and 78%, respectively. For the carrot experiment the water application efficiencies for the 100% Epan and crop factor treatments were 14% higher than the 150% Epan treatment. These results indicate that the sprinkler irrigation systems in both experiments showed good performance makes the system suitable for experimental purposes and also for vegetable production on soils of this nature. / Despite the differences in irrigation volume, soil water contents remained very high and did not differ among treatments in both the experiments. The differential soil water stress index (DSWSI) for the 100% Epan (T1) and variable water replacement (VR) (TVR) treatments ranged from 0.74 to 1.71 for both broccoli and carrot trials. There were only small soil water tension differences among all the irrigation treatments and ranged from -2.4 kPa to -7.6 kPa, which was within the range between saturation and field capacity for sandy soil (0 to -10 kPa). / In the broccoli experiment, even though the 150% Epan (T2) irrigation treatment received 46% and 61% more irrigation than the 100% Epan (T1) and variable water replacement (TVR) irrigation treatments respectively, the treatments appeared to be largely negated by the high incidence of rainfall during the growing season. For example, the total depth of water application at 150% Epan was 13.9% and 17.2% greater than 100% Epan and TVR treatments respectively. As such the yield, biomass components and nutritional value (ascorbic acid and carotenoid content) did not vary among the treatments. However, irrigation was still required based on the set scheduling parameters and when considered in isolation of rainfall the irrigation crop water use efficiency (WUEi) on T1 and TVR treatments increased by 1.6-fold compared to T2 treatment. / For the carrot experiment the total depth of water application (rainfall and irrigation) for the 150% Epan treatment was 33% and 23% greater than at 100% Epan and Crop factor (CF) treatments, respectively. The yield (carrot roots) on a fresh weight basis (FW) for plants irrigated with the 150% of Epan and Crop factor (CF) treatments were 16% and 20% higher than the yield for plants irrigated with the 100% Epan treatment. Total (root and shoot) fresh weight of carrot plants irrigated For the carrot experiment the total depth of water application (rainfall and irrigation) for the 150% Epan treatment was 33% and 23% greater than at 100% Epan and Crop factor (CF) treatments, respectively. The yield (carrot roots) on a fresh weight basis (FW) for plants irrigated with the 150% of Epan and Crop factor (CF) treatments were 16% and 20% higher than the yield for plants irrigated with the 100% Epan treatment. Total (root and shoot) fresh weight of carrot plants irrigated with the CF treatment was 17% higher than the total fresh weight of plants irrigated with the 100% Epan treatment. However, there were no significant differences between irrigation treatments for root and total (root and shoot) mass on a dry weight basis and the ratio of carrot root to shoot, on a fresh and dry weight basis. The root lengths for plants grown with the CF and 150% Epan irrigation treatments averaged 30 cm, and were 14% larger than the root lengths for the 100% Epan treatment. The plant height for plants grown with the CF irrigation treatment was 6% higher than at the 100% Epan irrigation treatment and leaf length at the CF irrigation treatment was 12% greater than at the 150% Epan irrigation treatment. The root diameter and leaf width of carrots were not significantly different for all treatments. There were no significant differences in ascorbic acid and total carotenoid content of carrot roots among the three irrigation treatments. The average values of antioxidant content from diphenylpicrylhydrazyl (DPPH) scavenging, ARP (anti radical power) and total trolox equivalent antioxidant capacity were 44.83%, 0.8789 and 1.056μmol TE/g, respectively. The reduction of the irrigation level treatment from the 150% Epan water replacement to the 100% Epan water replacement increased the percentage of the DPPH scavenging by 1.55%, and total antioxidant capacity (AOC) and ARP activities by 4.19%. / On a dry weight basis, the crop water use efficiencies (WUE) (irrigation plus rain water) of carrot plants irrigated with the 100% Epan and CF treatments, were the same (0.013 g/mm). However, these were 30% greater than the WUE values of carrots irrigated with the 150% Epan treatment. On a fresh weight basis, the WUE of carrot plants irrigated with the 100% Epan and CF (0.120 and 0.132 g/mm) treatments were 14% and 26% greater than the WUE of carrot plants irrigated with the 150% Epan treatment, respectively. / An example of the diurnal trends of the carrot’s physiological responses to the irrigation treatments showed that on average, the rate of photosynthesis, stomatal conductance and intercellular CO2 for carrot plants grown with the 150% Epan treatment was higher than the rate of photosynthesis, stomatal conductance and intercellular CO2 at both the 100% Epan and CF treatments. However, not all the physiology measurements showed a significant difference among all the treatments. The variation in the physiological measurements was predominantly influenced by the change of temperature during the diurnal hours. / This study has proven the hypothesis that, on a free draining sandy soil, the irrigation treatments did not affect the growth and yield. However, there was a potential to reduce irrigation volumes from standard industry levels to maximise the WUE without decreasing the yield and crop quality, especially for broccoli and carrot, in Western Australia.

Mass, solute (chloride), isotope (deuterium) and thermal balances were completed at Perry Lakes, two semi-permanent 'water table' lakes near Perth, Western Australia. All balance components except groundwater discharge/recharge were measured independently. These difficult to measure groundwater components of lake-aquifer interaction were estimated by integrating mass, solute and chloride data in sequential 4 day balances spanning two years. Before urbanisation, such wetlands functioned predominantly as flow-through lakes. Now, large winter storm water inputs (and summer artificial level maintenance pumped locally from groundwater) dominate. In East Lake these inputs together comprise 42% of the annual water budget; groundwater discharge is reduced to just 2%. Even under flow-through conditions, these 'non natural' inputs are so large East Lake always tends towards a recharge state and commonly becomes a local groundwater mound. Flow-through is established in both lakes over winter. Initially each lake functions separately however as winter progresses shared capture and release zones are established. Maintenance of lake levels in early summer forces East Lake back to recharge status. Sediment heat flux (Qse) is significant in these very shallow lakes. Over summer Qse was negative, with a net movement of heat from the water into the sediments which act as a seasonal heat sink. In winter Qse was positive and stored summer heat was returned to the water column. This flux at times exceeded 40 W m-2. Evaporation was determined independently by floating pan, leaving Qse as the thermal balance residual. Ignoring Qse, annual evaporation determined by thermal balance was over estimated by 7%. Over and under estimates of individual 12 day balance period evaporation exceeded 50%. Monthly Class A (Perth airport) pan coefficients varied from 0.54 (January) to 0.86 (September). Ten empirical equations for evaporation were calibrated and compared with the East Lake floating pan. Best performer was the Makkink which tracked the floating pan closely throughout all seasons. Poorest were the Penman, DeBruin-Keijman, Priestly-Taylor and Brutsaert-Stricker which grossly over estimated late winter evaporation. Transpiration from Typha orientalis, estimated using hydrograph techniques was 43% of open water evaporation in summer and 28% annually. Temperature controlled evaporation pans (tracking lake temperature) experimentally determined the local deuterium content of lake evaporate ƒÔE, required for isotopic balances. Techniques employing pans evaporated to dryness and pans evaporated at constant volume were run in tandem continuously for two years. This study singularly integrates mass, solute and isotope balances thereby allowing groundwater components to be accurately quantified. The isotope balances are unique, being the only such balances incorporating experimentally derived local deuterium values of lake evaporate. This study represents the only thermal balance, the only accurate determination of pan-lake coefficients and the first calibration of commonly used empirical evaporation equations for Swan Coastal Plain wetlands. Groundwater levels in the western suburbs of Perth have declined over 40 years and a disproportionate larger decline now seriously threatens Perry Lakes. Modelling suggests regional groundwater extraction exceeds recharge. Wetland managers can no longer maintain East Lake via local groundwater extraction. Artificial recharge using imported surface and waste water are possible future management options.

Thesis (M.A.)--University of Montana, 2008. / Title from title screen. Description based on contents viewed Oct. 3, 2008. Includes bibliographical references.

Thesis (Ph.D.)--Victoria University (Melbourne, Vic.), 2009.

The inner continental shelf off the western half of the barrier island Fire Island, NY, is characterized by a series of obliquely oriented shoreface-connected ridges. The long-term historic shoreline record shows persistent undulations in shoreline shape at an alongshore scale similar to the alongshore scale of the ridges. This suggests that the ridges affect the wave transformation, alongshore sediment transport and corresponding shoreline change. These processes are investigated by utilizing the SWAN (Simulating WAves Nearshore) model, forced with realistic wave parameters, on a simplified, synthetic bathymetry replicating the scales of the shoreface-connected ridges. Results indicate that the relative magnitude of alongshore variations of modeled waves, alongshore transport, and the corresponding shoreline change are highly correlated with the relative orientation of the incoming waves to the ridges. Alongshore variations in both wave height and direction along the breaker line are much stronger when the predominant wave direction is along the main axis of the ridges rather than perpendicular to the ridge crests. This pattern of wave height variation is further explained by evaluating the directional energy spectrum and using a reverse ray-tracing technique. The gradients of the alongshore sediment transport, which lead to shoreline change, also appear to be stronger for waves with an angle of incidence similar to the ridge orientation. These results help explain the relationship between the oblique shoreface-connected ridges and the corresponding shoreline changes and shed light on the connection between the inner-shelf ridges and persistent shoreline undulations for the Western portion of Fire Island.

O Lago Guaíba configura-se como o grande depositário das águas de uma bacia hidrográfica que engloba boa parte do centro e nordeste do estado, estendendo-se por uma área aproximada de 84.700 km2 que abrange mais de 250 municípios, entre eles a capital do Estado. São 496 km2 de superfície onde diversos usos e atividades têm seu palco, como por exemplo; navegação, recreação, extração de areia e, a mais importante delas, o abastecimento de água de boa parte da região metropolitana de Porto Alegre. Mesmo com essa relevância, poucos são os estudos referentes à dinâmica sedimentar do lago, sendo que a maioria trata da distribuição e textura dos sedimentos, e raros são aqueles que fazem menção ao padrão de ondas e suas relações com a ressuspensão destes sedimentos e suas conseqüências. A presente pesquisa analisa as características das ondas incidentes no Lago Guaíba quanto a seus principais parâmetros; altura significativa (Hs), período (T), direção de propagação e suas relações com a ressuspensão de sedimentos junto ao fundo. Para tanto, o SWAN (Simulating Waves Nearshore), software que utiliza técnicas de modelagem matemática, foi validado e aplicado, tendo como principais parâmetros de entrada a batimetria do lago, a direção, velocidade e freqüência de incidência de ventos na região (entre os anos 1996 e 1997), além de correntes, nível d’água, densidade, freqüências máximas e mínimas, entre outros. Já os parâmetros de saída (altura significativa da onda, período, direção de propagação e velocidade orbital) foram inseridos no Sistema de Informações Geográficas IDRISI e trabalhados de forma a inferir o padrão de ondas incidentes no lago e suas interações com a ressuspensão de sedimentos de fundo, caracterizando a profundidade de início do regime de fluxo turbulento e delimitando a área de atuação da turbulência vinculada ao transporte de sedimentos. As maiores ondas modeladas atingiram 0,55 m em alguns pontos do lago, principalmente quando de ventos soprando dos quadrantes S e SE e em intensidades superiores a 7 m/s. Em linhas gerais as ondas acompanham os padrões de intensidade e direção do vento, atingindo os valores máximos aproximadamente entre 1 e 2 horas após os picos de velocidade dos ventos. Em situações de maior intensidade de ventos as ondas levaram aproximadamente 2 horas para atingirem 0,10 m, já com ventos fracos a moderados este tempo é de aproximadamente 3 horas. Além de velocidade e direção, a regularidade dos ventos mostrou-se relevante na geração e propagação de ondas no Guaíba. Características geomorfológicas referentes à geometria, batimetria e o fetch do lago também são importantes, fato evidenciado quando da análise de cinco estações de controle sob um mesmo regime de ventos; a diferença entre a altura das ondas chegou a mais de 0,40 m entre porções distintas do lago. Além disso, há o processo de refração das ondas que causa um rápido alinhamento da zona de rebentação de tal maneira que ela tende a ser paralela a linha de praia. Os parâmetros que estabelecem as condições deposicionais no Guaíba são controlados pelo nível de energia das ondas incidentes e pelas correntes. Pode-se afirmar que em função das pequenas profundidades e baixas velocidades médias das correntes de fundo, o transporte de sedimentos finos é particularmente governado pelas ondas, uma vez que as mesmas são responsáveis pela inserção dos sedimentos na coluna d’água. As ondas incidentes no Guaíba têm potencial para gerar turbulência junto ao fundo em diferentes situações. Entretanto, a profundidade máxima não excede a 1,9 m para ventos do quadrante S e velocidades da ordem de 11 m/s. Já a espessura da camada limite onde se verifica inicio do fluxo turbulento apresenta valores bastante reduzidos, entre 0,02 a 1 cm. Os ambientes de sedimentação do lago foram mapeados e assim classificados: 1) Fundo Deposicional (51% da área do lago); 2) Fundo Transicional (41%) e 3) Fundo Erosional ou de não Deposição (8%). Estas condições foram espacializadas em um modelo temporal que relacionou as informações sobre velocidade orbital e a freqüência de incidência de ondas quanto à sua direção, derivadas dos resultados modelados pelo SWAN ao longo do período estudado. Pode-se afirmar que o Guaíba é um grande importador de sedimentos, uma vez que a superfície de fundo com deposição é mais significativa que a superfície de fundo com erosão, condição esta que ocorre a profundidades inferiores a 1,5 m. A situação de deposição do material transportado na coluna d’água ocorre quando da inexistência de fluxo turbulento, ou quando o mesmo é insignificante junto ao fundo (com potencial de ressuspensão de sedimentos em até 7 dias por ano, ou 2% do tempo analisado). Como forma de contribuir à gestão ambiental da região, foram gerados subsídios referentes ao potencial de concentração de material particulado em suspensão. Este potencial foi definido em função do percentual de tempo, ao longo do ano, em que a ressuspensão de sedimentos de fundo gerada por ondas pode incrementar os níveis de poluição nos locais onde a água é atualmente captada para o abastecimento público no município de Porto Alegre. / Guaíba Lake is the main destination of the water coming from a river basin which encompasses a major part of the center and northeast of Rio Grande do Sul state, extending over some 84,700 square km and reaching more than 250 municipalities, including the state capital. This adds up to a 496 sq. km area, where several functions and activities occur, such as navigation, recreation, sand extraction, and, most important of all, water supply to a large part of the metropolitan Porto Alegre area. Despite this relevance, few studies have been conducted on the lake’s sedimentary dynamics, with most of them addressing sediment distribution and textures, and even fewer mentioning wave pattern and its connection with the ressuspension of these sediments and its consequences. This research examines the characteristics of Lake Guaíba’s waves with regard to their main parameters; significant wave height (Hs), period (T), direction of wave propagation and its connections with the ressuspension of sediments at the bottom. To this end, SWAN (Simulating Waves Nearshore) a type of software using mathematical modeling techniques, has been validated and applied, with its main inputs being the lake’s bathymetry, direction, wind speed and frequency in the region (between 1996 and 1997) in addition to currents, water level, density, and maximum and minimum frequencies, among others. Output parameters (significant wave height, period, direction of wave propagation, and orbital motion) were inserted in the IDRISI Geographic Information System and studied so as to infer the lake’s wave pattern and its interactions with the ressuspension of bottom sediments, characterizing depth at the beginning of the turbulent flow and encircling the area of turbulence linked to transport of sediments. The highest waves modeled reached 0.55 m in a few points of the lake, particularly when winds were blowing from the S and SE quadrants with an intensity of over 7 m/sec. Generally speaking, waves follow wind intensity and direction patterns, and reach maximum values in about 1 to 2 hours after wind speed peaks. Whenever winds were stronger, waves took some 2 hours to reach 0.10 m, but with weak to moderate winds, they took around 3 hours. In addition to speed and direction, wind regularity proved relevant in generating and propagating waves on Lake Guaíba. Geomorphologic characteristics as regards the lake’s geometry, bathymetry and fetch are likewise important, as was verified when five control stations were analyzed under a same wind pattern; the difference between wave height exceeded 0.40 m among distinctive parts of the lake. In addition, there is a wave refraction process, which causes a fast alignment to the breaker zone, so that it tends to be parallel to the shoreline. The parameters establishing Lake Guaíba’s depositional environment are controlled by the energy level of the existing waves and currents. It can be stated that, as a result of small depths and low average speeds of the bottom currents, the transport of fine sediments is particularly governed by the waves, since it is the waves that add sediments to the water column. The Guaíba waves can potentially generate bottom turbulence in different situations. However, the maximum depth does not exceed 1.9 m with S quadrant winds and speeds of about 11 m/s. On the other hand, the thickness of the bordering layer where the turbulent flow begins has very low values, between 0.02 to 1 cm. The lake’s sediment environments were mapped and rated as follows: 1) Depositional Environment (51% of the lake); 2) Transitional Environment (41%); and 3) Erosional or Non- Depositional Environment (8%). Such conditions were spatialized in a time model which linked information on orbital motion and frequency of wave occurrence as to direction, obtained from the SWAN-modeled results throughout the period under study. It can be stated that Lake Guaíba is a major importer of sediments, since its depositional environment area is more significant than its erosional environment area, and this situation occurs at depths of less than 1.5 m. Deposition of matter carried in the water column occurs when there is no turbulent flow, or when it is insignificant to the environment (with a sediments ressuspension potential of up to 7 days a year, or 2% of the time analyzed). As a contribution to the region’s environmental management, subsidies have been created with relation to the concentration of particulate suspended matter. This potential has been defined as a percentage of time, throughout the year, in which the wave-created ressuspension of environment sediments can increase the pollution levels at places where water is currently captured for public supply in the Porto Alegre area.

O Lago Guaíba configura-se como o grande depositário das águas de uma bacia hidrográfica que engloba boa parte do centro e nordeste do estado, estendendo-se por uma área aproximada de 84.700 km2 que abrange mais de 250 municípios, entre eles a capital do Estado. São 496 km2 de superfície onde diversos usos e atividades têm seu palco, como por exemplo; navegação, recreação, extração de areia e, a mais importante delas, o abastecimento de água de boa parte da região metropolitana de Porto Alegre. Mesmo com essa relevância, poucos são os estudos referentes à dinâmica sedimentar do lago, sendo que a maioria trata da distribuição e textura dos sedimentos, e raros são aqueles que fazem menção ao padrão de ondas e suas relações com a ressuspensão destes sedimentos e suas conseqüências. A presente pesquisa analisa as características das ondas incidentes no Lago Guaíba quanto a seus principais parâmetros; altura significativa (Hs), período (T), direção de propagação e suas relações com a ressuspensão de sedimentos junto ao fundo. Para tanto, o SWAN (Simulating Waves Nearshore), software que utiliza técnicas de modelagem matemática, foi validado e aplicado, tendo como principais parâmetros de entrada a batimetria do lago, a direção, velocidade e freqüência de incidência de ventos na região (entre os anos 1996 e 1997), além de correntes, nível d’água, densidade, freqüências máximas e mínimas, entre outros. Já os parâmetros de saída (altura significativa da onda, período, direção de propagação e velocidade orbital) foram inseridos no Sistema de Informações Geográficas IDRISI e trabalhados de forma a inferir o padrão de ondas incidentes no lago e suas interações com a ressuspensão de sedimentos de fundo, caracterizando a profundidade de início do regime de fluxo turbulento e delimitando a área de atuação da turbulência vinculada ao transporte de sedimentos. As maiores ondas modeladas atingiram 0,55 m em alguns pontos do lago, principalmente quando de ventos soprando dos quadrantes S e SE e em intensidades superiores a 7 m/s. Em linhas gerais as ondas acompanham os padrões de intensidade e direção do vento, atingindo os valores máximos aproximadamente entre 1 e 2 horas após os picos de velocidade dos ventos. Em situações de maior intensidade de ventos as ondas levaram aproximadamente 2 horas para atingirem 0,10 m, já com ventos fracos a moderados este tempo é de aproximadamente 3 horas. Além de velocidade e direção, a regularidade dos ventos mostrou-se relevante na geração e propagação de ondas no Guaíba. Características geomorfológicas referentes à geometria, batimetria e o fetch do lago também são importantes, fato evidenciado quando da análise de cinco estações de controle sob um mesmo regime de ventos; a diferença entre a altura das ondas chegou a mais de 0,40 m entre porções distintas do lago. Além disso, há o processo de refração das ondas que causa um rápido alinhamento da zona de rebentação de tal maneira que ela tende a ser paralela a linha de praia. Os parâmetros que estabelecem as condições deposicionais no Guaíba são controlados pelo nível de energia das ondas incidentes e pelas correntes. Pode-se afirmar que em função das pequenas profundidades e baixas velocidades médias das correntes de fundo, o transporte de sedimentos finos é particularmente governado pelas ondas, uma vez que as mesmas são responsáveis pela inserção dos sedimentos na coluna d’água. As ondas incidentes no Guaíba têm potencial para gerar turbulência junto ao fundo em diferentes situações. Entretanto, a profundidade máxima não excede a 1,9 m para ventos do quadrante S e velocidades da ordem de 11 m/s. Já a espessura da camada limite onde se verifica inicio do fluxo turbulento apresenta valores bastante reduzidos, entre 0,02 a 1 cm. Os ambientes de sedimentação do lago foram mapeados e assim classificados: 1) Fundo Deposicional (51% da área do lago); 2) Fundo Transicional (41%) e 3) Fundo Erosional ou de não Deposição (8%). Estas condições foram espacializadas em um modelo temporal que relacionou as informações sobre velocidade orbital e a freqüência de incidência de ondas quanto à sua direção, derivadas dos resultados modelados pelo SWAN ao longo do período estudado. Pode-se afirmar que o Guaíba é um grande importador de sedimentos, uma vez que a superfície de fundo com deposição é mais significativa que a superfície de fundo com erosão, condição esta que ocorre a profundidades inferiores a 1,5 m. A situação de deposição do material transportado na coluna d’água ocorre quando da inexistência de fluxo turbulento, ou quando o mesmo é insignificante junto ao fundo (com potencial de ressuspensão de sedimentos em até 7 dias por ano, ou 2% do tempo analisado). Como forma de contribuir à gestão ambiental da região, foram gerados subsídios referentes ao potencial de concentração de material particulado em suspensão. Este potencial foi definido em função do percentual de tempo, ao longo do ano, em que a ressuspensão de sedimentos de fundo gerada por ondas pode incrementar os níveis de poluição nos locais onde a água é atualmente captada para o abastecimento público no município de Porto Alegre. / Guaíba Lake is the main destination of the water coming from a river basin which encompasses a major part of the center and northeast of Rio Grande do Sul state, extending over some 84,700 square km and reaching more than 250 municipalities, including the state capital. This adds up to a 496 sq. km area, where several functions and activities occur, such as navigation, recreation, sand extraction, and, most important of all, water supply to a large part of the metropolitan Porto Alegre area. Despite this relevance, few studies have been conducted on the lake’s sedimentary dynamics, with most of them addressing sediment distribution and textures, and even fewer mentioning wave pattern and its connection with the ressuspension of these sediments and its consequences. This research examines the characteristics of Lake Guaíba’s waves with regard to their main parameters; significant wave height (Hs), period (T), direction of wave propagation and its connections with the ressuspension of sediments at the bottom. To this end, SWAN (Simulating Waves Nearshore) a type of software using mathematical modeling techniques, has been validated and applied, with its main inputs being the lake’s bathymetry, direction, wind speed and frequency in the region (between 1996 and 1997) in addition to currents, water level, density, and maximum and minimum frequencies, among others. Output parameters (significant wave height, period, direction of wave propagation, and orbital motion) were inserted in the IDRISI Geographic Information System and studied so as to infer the lake’s wave pattern and its interactions with the ressuspension of bottom sediments, characterizing depth at the beginning of the turbulent flow and encircling the area of turbulence linked to transport of sediments. The highest waves modeled reached 0.55 m in a few points of the lake, particularly when winds were blowing from the S and SE quadrants with an intensity of over 7 m/sec. Generally speaking, waves follow wind intensity and direction patterns, and reach maximum values in about 1 to 2 hours after wind speed peaks. Whenever winds were stronger, waves took some 2 hours to reach 0.10 m, but with weak to moderate winds, they took around 3 hours. In addition to speed and direction, wind regularity proved relevant in generating and propagating waves on Lake Guaíba. Geomorphologic characteristics as regards the lake’s geometry, bathymetry and fetch are likewise important, as was verified when five control stations were analyzed under a same wind pattern; the difference between wave height exceeded 0.40 m among distinctive parts of the lake. In addition, there is a wave refraction process, which causes a fast alignment to the breaker zone, so that it tends to be parallel to the shoreline. The parameters establishing Lake Guaíba’s depositional environment are controlled by the energy level of the existing waves and currents. It can be stated that, as a result of small depths and low average speeds of the bottom currents, the transport of fine sediments is particularly governed by the waves, since it is the waves that add sediments to the water column. The Guaíba waves can potentially generate bottom turbulence in different situations. However, the maximum depth does not exceed 1.9 m with S quadrant winds and speeds of about 11 m/s. On the other hand, the thickness of the bordering layer where the turbulent flow begins has very low values, between 0.02 to 1 cm. The lake’s sediment environments were mapped and rated as follows: 1) Depositional Environment (51% of the lake); 2) Transitional Environment (41%); and 3) Erosional or Non- Depositional Environment (8%). Such conditions were spatialized in a time model which linked information on orbital motion and frequency of wave occurrence as to direction, obtained from the SWAN-modeled results throughout the period under study. It can be stated that Lake Guaíba is a major importer of sediments, since its depositional environment area is more significant than its erosional environment area, and this situation occurs at depths of less than 1.5 m. Deposition of matter carried in the water column occurs when there is no turbulent flow, or when it is insignificant to the environment (with a sediments ressuspension potential of up to 7 days a year, or 2% of the time analyzed). As a contribution to the region’s environmental management, subsidies have been created with relation to the concentration of particulate suspended matter. This potential has been defined as a percentage of time, throughout the year, in which the wave-created ressuspension of environment sediments can increase the pollution levels at places where water is currently captured for public supply in the Porto Alegre area.