The retention potential of landscapes, along with the water regime of spring areas, are important hydrological topics of research, particularly in the current context of increasing extreme drought frequencies. The present work is focused on monitoring the mountain peat bogs, which, due to their overall frequency of occurrence in the spring area of the Vydra river, represent a significant constituent of the rainfall-runoff process of the area of interest. The specific hydropedological features of the organogenous soils (Histosol type soil) provide the high retention potential of the area, however, the influence of these soils on the runoff process is determined by complex physicogeographical factors. The general opinion on the hydrological function of the peat bogs has changed in recent years and the most important factor in the runoff formation in the mountain area of the Šumava Mts. is now thought to be the actual saturation of the headwater, which is predominantly composed of hydromorphic and organogenous soils. The organogenous soils are significant water reservoirs and have an important impact on the landscape. However, they may also intensify the extreme values of the watercourses during extreme precipitation events. The fundamental part of this work focuses on detailed observations of the...

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Thesis (MScAgric)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: Hillslope hydrology represents a complex system with several interacting processes influencing the movement of water through the landscape. The Western Cape area of South Africa is expected to be impacted on by a change in climate and the importance of water management that will increase in the future. Climate, especially precipitation, is the driving factor behind the hydrological system and there are currently no predictions as to what the impact will be on the hydrological conditions. The main objective of the study is to understand the hydrological responses along a hillslope and secondly to determine the effect of climate change on the hydrology by using hydrological models. The studied system is situated on the Langgewens Experimental Farm, north of Malmesbury in the Swartland region of the Western Cape. Six sites in a range of vegetation, land use and expected soil types along a toposequence were investigated. All sites are rain fed areas with natural vegetation, seasonal or long-term shrubs. Through monitoring different components of the hydrological cycle, including rainfall, overland flow, infiltration, soil water content, base flow and water table depth at the different sites, the movement of water through the landscape can be defined. Hillslope hydrological processes at different positions on the hillslope were investigated. The baseline data obtained during this process was used in hydrological modelling for the different positions on the hillslope to determine the accuracy of model predictions. Expected future climatic conditions were emulated in this model to determine the possible effect of a change in climate on the hydrological system. The research confirmed the complex interaction between different processes within the hydrological system. At each point along the toposequence different components of the hydrological cycle contributed on a different scale to the hydrological system. Soil properties were the most significant factor influencing water movement through the landscape, directly impacting infiltration, overland flow, lateral water flow and deep percolation. This resulted in water table fluctuations through the seasons as the contribution of different components towards the hydrological cycle changed. By comparing soil water content measurements through the season with modelled water content levels, accurate hydrological models were created for different measuring points in the landscape. By using forecasted climate data of two different weather generators, accurate estimations of expected soil water content were possible. This indicated that droughts will occur on a regular basis in the future. This research made it possible to understand water movement through the landscape at hillslope level and contributed towards future water management plans by estimating future soil water content levels based on current predictions. / AFRIKAANSE OPSOMMING: Heuwelhang hidrologie omskryf die proses van water beweging deur die landskap en dit word deur verskeie prosesse beinvloed. Onder huidige toestande word verwag dat die Weskaap provinsie van Suid-Afrika warmer en droëer sal word in die toekoms as gevolg van klimaatsverandering. Dit sal die noodsaaklikheid van effektiewe waterbestuur verhoog in die toekoms. Klimaat, en in besonder reënval, is die dryfkrag agter die hidrologiese sisteem en huidiglik is daar geen aanduiding van wat die effek van klimaatsverandering op die hidrologiese sisteem gaan wees nie. Die eerste doel van die studie is om die heuwelhang se hidrologiese sisteem te ontleed en tweedens om die impak van klimaatsverandering op die hidrologiese sisteem te bepaal deur gebruik te maak van hidrologiese modelle. Die studie area is geleë op die Langgewens Proefplaas, noord van Malmesbury in die Swartland distrik van die Weskaap. Ses verskillende posisies is op die heuwelhang geselekteer op grond van posisie in die landskap, plantegroei, landgebruik en verwagte grondvorms. Al die studiepunte ontvang slegs water deur reën en die landgebruik wissel ten opsigte van natuurlike plantegroei, en eenjarige- of meerjarige gewasse wat gevestig is. Deur verskillende komponente van die hidrologiese sisteem te monitor, insluitend reënval, oppervlak afloop, infiltrasie, grond water inhoud, laterale water vloei en die diepte van die watertafel, kan die beweging van water deur die landskap gedefinieër word. Die data wat versamel is gedurende die proses word gebruik om die akkuraatheid van die hidrologiese modelle se resultate te bepaal. Tesame met vooruitgeskatte klimaatdata kan die modelle gebruik word om die impak van klimaatsverandering op grondwater toestande vas te stel. Die navorsing toon die komplekse interaksie tussen verskillende prosesse in die hidrologiese sisteem. By elke punt in die landskap dra verskillende komponente op verskillende skale by tot die hidrologiese sisteem. Grondeienskappe het die meeste invloed op die verskillende komponente van die hidrologiese sisteem en beïnvloed die infiltrasie, oppervlak afloop, laterale water vloei en diep dreinering. Soos die verskillende komponente se bydrae tot die hidrologiese sisteem verander, vind daar fluktuasies in die diepte van die water tafel plaas. Deur die vergelyking van gemete grondwaterinhoud teen hidrologiese model voorspelde grondwaterinhoude, is akkurate hidrologiese modelle opgestel vir verskillende punte in die landskap. Deur gebruik te maak van twee moontlike verwagte klimaat toestande, is gevind dat droogtes op ‘n roetine basis in die toekoms sal voorkom. Die navorsing maak dit moontlik om die beweging van water deur die landskap te verstaan en dra by tot die opstelling van toekomstige waterbestuur planne. Dit word moontlik gemaak deur die vooruitskatting van grondwater inhoude gebasseer op verwagte klimaatsveranderinge en huidige grondwater toestande. / Water Research Commission

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On se propose d'étudier l'hydrosystème Vaccarès, partie centrale du delta du Rhône, parfait exemple d'interrelations fortes entre l'homme et le milieu naturel. L'approche s'est déroulée en trois parties. L'acquisition et le traitement de données hydrologiques nous ont permis de caractériser la dynamique hydro-saline de ce système complexe. A partir d'une analyse plus approfondie nous avons établi les bilans hydro-salins et sédimentaires à l'échelle du complexe lagunaire. Grâce à un suivi de 18 années, les bilans sédimentaires dévoilent un déficit sédimentaire de 19 500 tonnes quand on ne prend pas en compte les apports exceptionnels des eaux d'inondation en 1993 et 1994. Un tel déficit, s'il perdure, ne fera qu'aggraver le différentiel d'altitude entre la mer et le delta, entrainant par la force des choses une salinisation du système non désirée par la plupart de ses acteurs. Dans un deuxième temps, nous avons procédé à l'implémentation et à la validation du modèle hydrodynamique du complexe lagunaire du Vaccarès. Son utilisation s'est tournée vers une complémentarité avec le modèle conceptuel de l'Hydrosystème Vaccarès. Ce dernier, baptisé Hydro-CAM, après avoir bénéficié d'une phase de calage et validation, a été exploité afin de tester la dynamique du système dans une démarche prospective. L'objectif ici, qui constitue le troisième temps de ces travaux de thèse, a été d'explorer par simulation les trajectoires possibles d'évolution de l'hydrosystème en termes de bilan d'eau et de sel, et ce d'après des scénarios construits sur les paramètres hydro-climatiques (changement climatique, augmentation du niveau marin) et anthropiques / The studied site is the Vaccarès hydrosystem, the central part of the Rhône delta and a good example of strong relationship between humans and a natural area. Through the data acquisition and data processing, we characterised the hydro-saline dynamic of this complex hydrosystem from 1993 to 2008. From a further analysis, we established first the hydro-saline and sedimentary balance across the lagoon complex. Through a monitoring of 16 years, the sedimentary balance revealed a sediment deficit of about 19'500 tons when we disregard the outstanding contributions of flooding waters in 1993 and 1994. If this deficit persists, the difference in altitude between the sea and the delta will tend to increase. This will result by a salinization of the system, unwanted by the most of his actors. To investigate these consequences, we conceived a hydrodynamic model of the Vaccarès lagoon complex, capable to simulate water levels and salinities. The model, named Hydro-CAM, was calibrated and validated in terms of water levels and salinities in three sub-units of the lagoon complex. It was then used to test the system dynamics in a prospective approach. The objective in this thesis work was to explore by simulation the possible trajectories of the evolution of the Hydrosystem in terms of water and salt balance. Simulations were based on scenarii constructed from climate parameters and anthropogenic parameters (water management, constructions, land use on drainage basins, etc.). The results revealed the vulnerability of this complex system to various risks which it is already facing and for which the intensification and/or increase can be expected in the future

L'évolution constante des villes passe par l'urbanisation des zones encore disponibles induisant des effets sur les bilans hydriques des celles-ci. De plus, le changement climatique susceptible d'exacerber les extrêmes (dont les inondations) influence lui aussi ces bilans. La ville est donc un objet hydrologique spécifique qu'il faut replacer dans son contexte évolutif, ce qui élargit considérablement la gamme d'échelles spatio-temporelles à prendre en compte pour son analyse et sa simulation. L'Union Européenne considère que la gestion du risque d'inondation doit remplacer la défense classique contre celle-ci. Cette nouvelle approche est plus holistique : elle prend en compte toutes les composantes du risque et cherche a réduire la vulnérabilité des récepteurs (habitants, bâtiments et infrastructures). Elle débouche sur la question de la résilience des systèmes urbains où les technologies correspondantes doivent être intégrées en des systèmes résilients aux inondations. Il est donc indispensable de développer des outils permettant l'évaluation de la performance de ces derniers, et ce à différentes échelles. Ces préoccupations ont défini l'axe de développement de Multi-Hydro : faire interagir des modèles déjà éprouvés représentant une composante du cycle de l'eau, permettre d'effectuer ainsi des progrès substantiels dans la modélisation de l'eau en ville avec une facilité d'utilisation. Multi-Hydro est ainsi basé sur des équations physiques supportées par des modèles distribués couplés. Grâce à un outil SIG dédié, MH-AssimTool, les informations géographiques et physiques nécessaires à la modélisation sont facilement assimilés pour chaque zone et résolution. En effet, une attention particulière été portée sur les observables ayant le moins de dépendance en échelle. L'emploi d'outils d'analyse multi-échelles permet de représenter leur variabilité et de définir des paramétrisations robustes du fonctionnement hydrologique à différentes échelles. L'ensemble de ces développements a été utilisé pour aborder la question de la résilience face aux inondations à différentes échelles d'un système urbain, dans le cadre de différents projets européens (SMARTeST, RainGain, BlueGreenDream) ou nationaux (Ville Numérique), à l'aide d'une approche systémique sur des scénarios pour plusieurs cas d'étude :- un petit bassin versant de Villecresnes (Val-de-Marne) qui a servi a l'évaluation des impacts de chaque modification apportée au modèle au cours de son développement.- la partie Est de la commune de Saint-Maur-des-Fossés (Val-de-Marne) qui a subi un audit de l'état du réseau d'assainissement (cartographie précise des canalisations et campagnes de mesures) et dont les résultats préliminaires ont permis de poser la problématique de la modélisation des rivières.- un quartier d'Heywood (grande banlieue de Manchester, Royaume Uni), qui a subi plusieurs inondations durant la dernière décennie et demande une modélisation assez fine pour permettre l'évaluation de l'impact de quatre scénarios de protection.- le bassin versant de la Loup, dont l'exutoire est occupé par un bassin de stockage des eaux de pluie, a été modélisé pour quatre évènements d'intensités et de durées variables et a permis de débuter la validation du modèle.- la zone de Spaanse Polder (Rotterdam, Pays Bas), pose la problématique de la modélisation des zones très planes au système de drainage complexes (pompes, exutoires multiples). Cette zone permet de guider les développements futurs de Multi-Hydro. Dans le contexte de l'amélioration de la résilience des villes face aux inondations, Multi-Hydro se place comme étant un outil qui offre la possibilité de simuler des scénarios permettant l'évaluation des impacts à l'échelle globale de modifications à plus petites échelles. Grâce a sa facilité de mise en place que lui confère MH-AssimTool, ainsi que sa structure modulaire et sa liberté de licence, Multi-Hydro est en train de devenir un outil d'aide à la décision / The constant evolution of cities can be seen as the urbanisation of the still available areas. This introduces complex effects with respect to the balance of water. In addition, the highly variable nature of the climate and weather can easily exacerbate the extremes (including floods) thus influencing the water balance. The European Union considers that the management of flood risk is an appropriate strategy to replace conventional defense strategies against floods. This new strategy is a more holistic approach: it takes into account all the components at risk and seeks to reduce the vulnerability of receptors (people, buildings and infrastructures).Thus, resilience measures not only consist of individual technical solutions but they need to be integrated to a ‘safety chain', which requires the development of resilience systems and tools. It is therefore essential to develop tools for assessing the performance of the latter, and at different scales. These concerns have help define the development of Multi-Hydro: interacting models already proven to represent different components of the water cycle to allow substantial progress in the modelling of urban water combined with ease use. Multi-Hydro is based on physical equations supported by distributed and coupled models. With a dedicated GIS MH-AssimTool, the geographical and physical information required for modelling are easily assimilated for each zone and at each resolution. Indeed, special attention was paid to the observables with the least scale dependence. Tools for multi-scale analysis are used to represent their variability at smaller scales than their own scales, thus allowing a more robust definition of hydrological parameterisations at different scales. All of these developments have been used to address the issues involved in flooding resilience at different urban system levels, within the framework of the European (Smartest, RainGain and BlueGreenDream) and national (Ville Numérique) projects, using a systemic approach on the scenarios of several case studies:- A small watershed Villecresnes (Val-de-Marne), used to assess the impacts of each change made in the model during its development.- The eastern part of the municipality of Saint-Maur-des-Fossés (Val-de-Marne ), has undergone a state audit of the drainage network (precise mapping of pipes and measurement campaigns). The preliminary results helped raise the issue of modelling rivers.- A district at Heywood (suburbs of Manchester, UK), has suffered several floods over the last decade and requires more detailed modelling in order to allow for the assessment of impact of four protection scenarios.- The catchment area of the Loup, whose outlet is connected to a runoff water storage tank, was modelled over four events of varying durations and intensities and helped start the validation of the model.- The Spaanse Polder area (Rotterdam , Netherlands), poses the problem of modelling very flat terrain with a complex drainage system (pumps and multiple outlets). This area will help to guide the future development of Multi-Hydro. In the context of improving the resilience of cities to flooding, Multi-Hydro is therefore placed as a tool that provides the ability to simulate scenarios for impact assessment at the basin scale of changes to smaller scales. Due to its ease of implementation at various scales conferred by MH-AssimTool and its modular structure and its free access property, Multi-Hydro is becoming a support decision tool

Les lacs urbains, souvent artificiels, sont complètement intégrés dans le tissu urbain et exercent des fonctions variées, très importantes pour le fonctionnement durable des villes. Ces écosystèmes sont fortement affectés par les activités anthropiques, par l'urbanisation accompagnée du changement de l'occupation du sol et de l'imperméabilisation du bassin versant, à l'origine d'un ruissellement plus important et plus chargé en polluants. En raison de ces pressions anthropiques, de nombreux plans d'eau dans le monde souffrent d'eutrophisation et sont fréquemment touchés par des proliférations de cyanobactéries, dont certaines espèces sont potentiellement toxiques. L'objectif de cette thèse est de contribuer à une meilleure compréhension des facteurs impliqués dans la dynamique des cyanobactéries dans les lacs urbains. Notre recherche a été menée sur deux sites d'études : le lac d'Enghien en France et le lac de Pampulha au Brésil. Dans le site d'étude français, nous avons bénéficié de nouvelles technologies de suivi du phytoplancton pour modéliser la dynamique des cyanobactéries à courte échelle de temps. Dans le lac brésilien, notre site d'étude principal, la modélisation de la dynamique des cyanobactéries a été réalisée, en prenant en considération l'insertion du lac dans son bassin versant grâce à une modélisation intégrée : le modèle du lac destiné à la simulation des cyanobactéries est couplé à un modèle hydrologique qui simule les débits et la qualité de l'eau des affluents entrant dans le lac. La modélisation s'est basée sur des mesures de terrain recueillies durant un suivi de 21 mois. La performance d'une sonde spectrofluorométrique dans l'estimation de la biomasse phytoplanctonique dans ce lac hypereutrophe a été évaluée. Sur ce site d'étude, nos résultats ont montré que :• La sonde spectrofluorométrique sous-estime la biomasse cyanobactérienne quand (i) des cyanobactéries de l'ordre Oscillatoriales sont présentes car elles ont une fluorescence moindre par unité de chl-a, (ii) des cyanobactéries coloniales représentent plus de 20% de la biomasse cyanobactérienne et (iii) la chlorophylle total spectrofluorométrique est au-dessus de 100 μg chl-a.L-1.• Le modèle hydrologique a montré une bonne performance pour la simulation du débit (coefficient de Nash entre 0.70 et 0.88 en calage et 0.72 et 0.78 en validation) et des résultats moyennement satisfaisants pour la simulation des polluants. Le modèle du lac, développé par étapes, a présenté une bonne capacité prédictive de la dynamique des cyanobactéries, dans sa version plus complète, NMAE = 0.26 en calage et 0.55 en validation.• Les apports par temps de pluie sont une source importante de matières en suspension, phosphate et nitrates pour le lac de Pampulha. L'ammonium provient surtout des eaux usées rejetées dans les cours d'eau. Les épisodes pluvieux sont responsables des brassages de la colonne d'eau qui perturbent la croissance algale durant la saison humide.• Les cyanobactéries dans le lac de Pampulha étaient limitées par le phosphore pendant la majeure partie de notre suivi. Les épisodes de mélange du lac ont un effet important sur la disponibilité des nutriments dans les couches superficielles. Le travail mené dans le lac de Pampulha a permis d'avancer sur le couplage entre les aspects quantitatifs et qualitatifs du cycle de l'eau en milieu urbain et a fourni un outil qui peut être utilisé dans la simulation des scénarios de changement du bassin versant et leur impact sur le lac. La méthodologie développée dans cette thèse peut être appliquée ailleurs, en profitant des connaissances déjà acquises sur le lac de Pampulha / Urban lakes, often artificial, are fully integrated into the urban environment and perform several roles that are important for the sustainable functioning of cities. These ecosystems are strongly affected by human activities such as urbanization, land use changes and surface imperviousness which raise runoff in volume and speed, causing greater carrying capacity and greater pollutant load to aquatic receptors. Because of these anthropogenic activities, many lakes in the world are eutrophic and frequently affected by cyanobacterial blooms, some species of which are potentially toxic. The objective of this thesis is to contribute to a better understanding of the factors involved in the dynamics of cyanobacteria in urban lakes. Our research was conducted on two study sites: Lake Enghien in France and Lake Pampulha in Brazil. In the French study site, we benefited from new technologies for monitoring phytoplankton to model the dynamics of cyanobacteria in short-term scale. In the Brazilian lake, our main study site, the modelling of the cyanobacteria dynamics was carried out taking into account the inclusion of the lake in its catchment through and integrated modelling: the model used to simule lake cyanobacteria is coupled to a hydrological model for simulating the runoff quantity and the quality, which is inputted into the lake. Both models were calibrated and validated using measurements collected during a 21-month monitoring program. The performance of a spectrofluorometric probe in estimating phytoplankton biomass in this hypertrophic lake was evaluated. On this study site, our results showed that:• The spectrofluorometric probe underestimates the cyanobacterial biomass when (i) Oscillatoria cyanobacteria are present because they have a lower fluorescence per unit of chl-a, (ii) colonial cyanobacteria represent more than 20% of the cyanobacterial biomass and (iii) spectrofluorometric total chlorophyll is above 100 μg chl-a.L-1.• The hydrological model showed a good performance for runoff simulation (Nash coefficient is between 0.70 and 0.88 in calibration and 0.72 and 0.78 in validation) and moderately satisfactory results for pollutants simulation. The lake model, developed in steps, showed good predictive ability of the cyanobacteria dynamics in its most complete version, NMAE = 0.26 (calibration) and 0.55(validation).• Runoff is a major source for suspended solids, phosphate and nitrate influxes into Lake Pampulha. Ammonium comes mainly from wastewater discharged into tributaries. Rainfall events are responsible for the mixing of the water column and disrupting algal growth during the wet season.• Cyanobacteria in Lake Pampulha were limited by phosphorus during most of our monitoring. Mixing episodes of the lake water column have different effects on the availability of nutrients in the surface layers. The research carried out in Lake Pampulha allows us to progress on the coupling between the quantitative and qualitative aspects of the water cycle in urban areas and provides a tool that can be used in the simulation of scenarios of the catchment changements and their impact on the lake. The methodology developed in this thesis can be applied elsewhere, taking advantage of existing knowledge on Lake Pampulha

Changes in the hydrological cycle are one of the expected impacts of climate change. Until recently, Central European mountain ranges have not been considered to be affected by water scarcity. Nevertheless, recent years have suggested an increasing risk of drought occurrence also in these regions, which have a major impact on the water supply to rivers that drain them. The master thesis deals with the evaluation of hydrological drought in the headwater areas of three catchments in the Ore Mountains for the period from 1967 to 2018. The main aim is to compare the of hydrological drought characteristics in the catchment areas of upper Svatava River, upper Rolava River and Načetínský brook based on available hydrological and climatic data. In connection with this, the work aims to detect the long-term trends of drought occurrence in selected basins. Furthermore, the emphasis is given on the evaluation of natural conditions, especially the historical and current land cover changes in the study catchments. The results point to a significant change in the seasonality of the occurrence of hydrological drought in the second half of the studied period, when the streamflow deficits concentrate between August and October. Furthermore, increasing trends in deficit volumes were found in the catchment areas of...

Orientador: Paulo César Rocha / Banca: José Tadeu Garcia Tommaselli / Banca: Luis Eduardo de Souza Robaina / Resumo: Os regimes de vazões dos rios correspondem a um importante indicador para a compreensão e estabelecimento da disponibilidade hídrica de uma bacia e para a manutenção da integridade ecológica. Em decorrência, seu monitoramento quantitativo e qualitativo permite entender o seu funcionamento e prescrever as quantidades mínimas para manutenção da vida e dos processos fluviais. Esta pesquisa apresenta os resultados da avaliação dos regimes hidrológicos do rio Paranapanema e seus principais afluentes que compõem sua bacia hidrográfica, assim como demais canais que constituem as Unidades de Gestão da bacia do rio Paranapanema, compreendendo uma área superior a 105.000 km². Esta análise possibilitou avaliar qualitativa e quantitativamente a variabilidade hidrológica desses rios, caracterizar seu regime, além de examinar as alterações hidrológicas ocorridas ao longo do tempo, para a elaboração de um mapeamento da história hidrológicas de tais rios. Para execução deste trabalho, foi necessário realizar uma revisão bibliográfica sobre a temática de estudo e caracterização ambiental da bacia; organização, tratamento e interpretação dos dados hidrológicos fornecidos pela rede hidrometeorológica existente na bacia e disponibilidade pela ANA-BRASIL, SIGRH/DAEE-SP, SUDERHSA-PR e a Empresa Duke Energy; avaliação e relacionamento do regime hidrológico dos rios com a variabilidade climática da bacia... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The flow regimes of the rivers are an important indicator for understanding and establishment of the catchment water availability and the maintenance of ecological integrity. As a result, its quantitative and qualitative monitoring allows us to understand this operation and prescribe the minimum quantities to maintain life and fluvial processes. This research presents the results of the assessment of the hydrological regimes of the Paranapanema and major rivers that form its watershed, as well as other channels that constitute the Management Units Paranapanema River Basin, covering an area exceeding 105,000 km ². This analysis allowed us to evaluate qualitatively and quantitatively the hydrological variability of rivers, characterize his regime, and to examine the hydrological changes that occurred over time... (Complete abstract click electronic access below) / Mestre

O processo de urbanização vem ocorrendo na maioria das cidades brasileiras de forma desorganizada. Desse modo, um problema recorrente que afeta diversos municípios brasileiros são as inundações. A falta de um planejamento que levasse em consideração a drenagem urbana no início do desenvolvimento das cidades acaba criando condições para que as inundações sejam deflagradas a cada época chuvosa. Assim, mostra-se necessária a planificação de medidas preventivas e corretivas que abordem essa questão, a fim de que os prejuízos causados pelas inundações sejam minimizados. Dessa forma, a modelação hidrológica aparece como uma poderosa ferramenta, ao tornar possível uma análise das medidas de controle, através da criação de cenários e simulação de eventos hidrológicos. Nesse contexto o presente trabalho tem como objetivo analisar, por meio de simulação hidrológica e hidráulica, o desempenho de algumas medidas de controle de inundação, estruturais e não-estruturais. Para tanto, com o auxílio do programa ArcGIS 9.3 e imagens de satélite de alta resolução, a bacia hidrográfica do Córrego do Gregório, em São Carlos SP, foi digitalizada e foram criados cenários alternativos que incorporaram as medidas de controle. Através da utilização dos softwares HEC-HMS e HEC-RAS foram realizadas as modelações hidráulica e hidrológica, utilizando tempos de retorno de 25, 50 e 100 anos para a chuva de projeto. Com os resultados obtidos (hidrogramas de cheia e manchas de inundação referentes a cada tempo de retorno), foi possível analisar as medidas comparando-se os diferentes cenários, e concluiu-se, para este caso, que os melhores resultados correspondem à associação das medidas estruturais e não-estruturais. Contudo, também foi verificado que, mesmo com a concretização do cenário mais favorável, o problema das inundações não seria satisfatoriamente equacionado, o que revela a necessidade de se considerar outras medidas para minimizar os prejuízos decorrentes das inundações, tais como medidas de controle na fonte, seguros contra inundações e sistemas de alerta antecipados. / The urbanization process has taken place in most Brazilian cities in a disorganized way, and floods are a recurring problem that has affected many municipalities. The lack of a planning that takes into account the urban drainage in the early development of the cities creates conditions for floods to occur in every rainy season. Therefore, the planning of preventive and corrective measures is necessary to address this issue in order to minimize the flood damages. Hydrological modeling appears as a powerful tool, as it enables the analysis of the flood management measures through the creation of scenarios and simulations of hydrological events. In this context, this dissertation analyzes the performance of some structural and nonstructural flood control measures by means of hydrologic and hydraulic simulations. The basin of the Gregório Stream, in São Carlos - SP, was scanned and scenarios that incorporate the management measures were created, both with the aid of software ArcGIS 9.3 and highresolution satellite images. Hydraulic and hydrologic modelings were performed by HEC-HMS and HEC-RAS software programs using return periods of 25, 50 and 100 years for the design storm. The results (flood hydrographs and flooding areas for each return period) allowed analyzing the measures by comparing the different scenarios and the best results corresponded to the association of structural and nonstructural measures. However, even by implementing the best scenario, the problem of flooding would not be satisfactorily solved, revealing the need to consider other measures to minimize flood damage, such as runoff source control measures, flood insurance and early warning systems.