Masato Kobiyama

Masato Kobiyama
Universidade Federal do Rio Grande do Sul | UFRGS · Departamento de Obras Hidráulicas (DOH)

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220
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Publications

Publications (220)
Article
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The concept of connectivity and its index have been widely discussed and applied to environmental studies such as ecology, hydrology, geomorphology and hydrosedimentology. Supposing that this concept is very useful also in disaster risk management, we define the hazard connectivity associated to debris flows as the connectivity degree between the d...
Article
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Purpose Mountain rivers differ from alluvial rivers due to their morphology and hydraulic characteristics. Within various types of mountain rivers, the canyon rivers are those under the direct or indirect influence of canyon landscapes. Studies involving canyons are extensive in the literature. However, there is a lack of knowledge to establish a r...
Article
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Identificar regiões suscetíveis a escorregamentos e realizar mapeamentos das áreas de perigo são ferramentas essenciais na gestão de risco e desastres associados a esses fenômenos naturais. Uma das ferramentas mais utilizadas para a elaboração de mapeamentos dessas áreas é a modelagem numérica. Dessa forma, o objetivo do presente estudo foi caracte...
Article
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The assessment of flood vulnerability is a complex task that involves numerous uncertainties. Within this context, sensitivity analyses are crucial to better understand the variability of vulnerability index outcomes according to different input parameters. The present study sheds light on the importance of assessing the sensitivity of different cr...
Article
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Effects of natural processes on community building and the modification of nature by man’s hands are an intrinsic part of the co-production of the landscape between man and nature. However, the interactions of this co-production have scarcely been analyzed. Based on data from the MapBiomas project, an analysis of the variation in land use and cover...
Preprint
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Extreme rainfall events have been more frequent, resulting in an increase in potentially catastrophic natural phenomena such as landslides and debris flows. To reduce disaster risk related, the hazard mapping for these phenomena is essential. Therefore, the objective of this study was (i) characterize geotechnical units with field survey in a mount...
Article
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Os canais fluviais e a rede de drenagem possuem um importante papel na evolução da paisagem. Estudos hidrogeomorfológicos fornecem informação valiosa para o entendimento das bacias hidrográficas e seus processos, uma vez que identificam fatores morfométricos relevantes dentro dos sistemas fluviais. Nesse sentido, a bacia do Rio Boi e as regiões des...
Article
We conducted several field surveys to measure velocity and channel geometry in 15 cross-sections distributed along three reaches in the Boi River (Southern Brazil), a canyon river that belongs to the most extensive canyon chain in South America. The three reaches present, respectively, canyon, transition, and floodplain landscapes. The resulting da...
Article
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Ainda são poucos os trabalhos voltados para monitoramento hidrológico de pequenas bacias hidrográficas, principalmente em bacias com grande diferença altimétrica e coberta por florestas. Nesse sentido, o presente trabalho objetiva analisar o escoamento superficial em escala de eventos de chuva e relacionar as variáveis hidrológicas da bacia hidrogr...
Article
Currently, there seems to be a consensus that the efforts and resources destined to fight disasters require the articulation of different sectors and, as a result, of different public policies. This study aimed to evaluate the integration of policies (National Protection and Civil Defense Policy-PNPDEC, National Water Resources Policy -PNRH, and Na...
Article
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O presente estudo teve por objetivo avaliar a velocidade de dois rios, Malacara e Molha Coco, de bacias montanhosas no sul do Brasil. As velocidades foram avaliadas com três métodos: (a) medição direta da velocidade em campo; (b) equações de Manning e de Jarret, usando dados geomorfológicos medidos em campo; (c) simulação com HEC-RAS 2D. Para verif...
Article
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Bacias hidrográficas montanhosas são mais propensas aos perigos naturais, devido à ocorrência de eventos hidrológicos de alta intensidade e às características geomorfológicas destes locais, como o relevo declivoso e a presença de leques aluviais. O presente estudo teve como objetivo avaliar a inundação em bacias hidrográficas montanhosas no sul do...
Article
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Given the recent developments in socio-hydrology and its potential contributions to disaster risk reduction (DRR), we conducted a systematic literature review of socio-hydrological studies aiming to identify persisting gaps and discuss tractable approaches for tackling them. A total of 44 articles that address natural hazards or disasters were revi...
Article
Escorregamentos e fluxos de detritos no Brasil são fenômenos naturais desencadeados por eventos extremos de chuva. Ao longo das últimas décadas, um grande número de eventos de diferentes magnitudes vem sendo registrados em diferentes regiões do Brasil. Como uma importante medida preventiva, frequentemente são elaborados mapas de áreas suscetíveis a...
Preprint
Full-text available
Given the recent developments in socio-hydrology and its potential contributions to disaster risk reduction (DRR), we conducted a systematic literature review of socio-hydrological studies aiming to identify persisting gaps and discuss tractable approaches for tackling them. A total of 44 articles that address natural hazards or disasters were revi...
Conference Paper
Full-text available
The relationship between water and society is a central challenge to achieve sustainability, thus the socio-hydrology has been developed focusing on the study of the multidirectional interactions of the human-water coupled system. The present study presented the current scenario of sociohydrology in Brazil and addressed some themes from sociohydrol...
Article
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The present study briefly evaluated the history of institutional and scientific aspects involving hydrology. In this evaluation, it is observed that hydrology is increasingly closer to society, discussing the interactions between society and hydrological processes. Therefore, hydrology has focused on analyzing the urban area, because this area has...
Article
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Given the increasing occurrence of landslides worldwide, the improvement of predictive models for landslide mapping is needed. Despite the influence of geotechnical parameters on SHALSTAB model outputs, there is a lack of research on models’ performance when considering different variables. In particular, the role of geotechnical units (i.e., areas...
Conference Paper
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In Brazil, cases such as the failure of the Fundão dam, in Mariana/MG and the Córrego do Feijão dam, in Brumadinho/MG show a deficient risk management in the country and demonstrate a technical liability to be overcome in the generation of emergency plans. It is important that plans incorporate predictions about the changing nature of risk in order...
Article
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Este estudo tem como objetivo investigar a sensibilização de alunos e professores de escolas dos Municípios de Imbituba e Lauro Müller sobre proteção e defesa civil. A pesquisa foi desenvolvida após participarem do Programa Defesa Civil na Escola como ação do Governo do Estado de Santa Catarina, com foco na redução de riscos de desastres. Procedeu-...
Article
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A trilha do Rio do Boi, localizada no Parque Nacional de Aparados da Serra, é popularmente conhecida como uma trilha de alto grau de dificuldade. Contudo, não existem estudos com uma classificação padronizada ou normativa referente a esse tipo de análise. Portanto, o objetivo do trabalho foi classificar o percurso da trilha do Rio do Boi de acordo...
Article
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As políticas públicas refletem as propostas do Governo para solucionar problemas públicos. A sinergia entre distintas políticas públicas pode viabilizar a efetividade das soluções. Portanto, existem grandes desafios para o estabelecimento de interfaces entre as políticas públicas. Assim, este trabalho objetivou analisar a Política Nacional de Prote...
Article
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Resumo: Os escorregamentos são processos naturais que podem trazer diversos impactos ambientais, sociais e econômicos. A identificação e mapeamento de áreas suscetíveis a escorregamentos são procedimentos importantes no gerenciamento de bacias hidrográficas. O uso de modelos de estabilidade de encostas auxilia na gestão da problemática envolvendo o...
Article
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Determining the rates of water infiltration into the soil is of extreme importance, because it does not only determine the recharge of aquifers, but also estimates the vulnerability to soil contamination. Considering this, the present study aims to determine the rate of water infiltration into the soil using the DRASTIC method in the Vacacaí-Mirim...
Article
Despite scientific progress and international efforts, records of natural disasters and their losses are enhancing. Natural disasters are constituted by the mutual interactions between social and environmental factors over time and space. Hence, the challenges of this dramatic scenario demand understanding the interwoven social and environmental pr...
Article
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A evapotranspiração, como parte do ciclo hidrológico, é classificada em duas categorias: real e potencial, onde a primeira representa a perda natural de água para a atmosfera, e a segunda, retrata condições ótimas de equilíbrio entre a evaporação e a transpiração. Neste trabalho foi caracterizado a evapotranspiração potencial (ETP) pelos métodos de...
Article
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La ocurrencia de inundaciones y movimientos de masa húmeda pueden causar serios disturbios en la sociedad, consecuencias que son acentuadas debido a la falta de conocimiento y organización de estas. En países de Sur América se registra una alta tasa de desastres relacionados al agua con efectos intensificados debido a las características de estos....
Technical Report
Full-text available
The connectivity support understanding the hydrosedimentological (water and sediments) processes that occur in the watershed and influence the water and sediment transfer at different spatial-temporal scales. This document presents the index of hydrosedimentological connectivity (IHC) created from the equation of the connectivity index (IC) by Bors...
Article
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Due to the complexity and difficulty of observing debris flow in the field, computational modeling has been used to investigate this geological phenomenon. One of the computational simulators for this purpose is Kanako-2D. In order to understand the phenomenon itself and the model, the present study performs a sensitivity analysis of the Kanako-2D...
Article
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Despite the increasing body of research on flood vulnerability, a review of the methods used in the construction of vulnerability indices is still missing. Here, we address this gap by providing a state-of-art account on flood vulnerability indices, highlighting worldwide trends and future research directions. A total of 95 peer-reviewed articles p...
Article
How well do traditional and analytical hydraulic geometry hypotheses predict discharge? We tested whether Dingman’s analytical expressions can be validated with field data by comparing it with the traditional Leopold-Maddock at-a-station hydraulic geometry (AHG). Data from a small basin (66 km²) in southern Brazil were used. The correlations for al...
Article
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Mass movements inventories play a key role to the understanding of watershed dynamics. The alteration of this dynamics occurs in the moment of failure and after it due the erosion when precipitation hits the uncovered soil at the mass movement scars. Thus, this paper has characterized these mass movements, which are classified as landslides, occurr...
Article
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Multi-disasters took place in the Mampituba River basin, southern Brazil, as a consequence of the passing of two cyclones, in July 2020. The first one was a bomb cyclone that caused several storm winds, damaging the rooftops and overthrow countless trees. The second was an extratropical cyclone that brought extreme precipitation, and triggered stor...
Article
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A representação do processo precipitação-vazão por meio de modelos hidrológicos conceituais visa quantificar o volume escoado em uma bacia como consequência de uma determinada precipitação. Aliados a eles, os índices têm sido uma ferramenta útil para quantificar eventos extremos, como o Soil Moisture Index (TMI) que foi formulado a partir do modelo...
Article
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The effect that wood deposited in a river, woody debris (WD), causes on its hydrogeomorphic processes depends on the dimensions of the wood and the channel. Studies related to WD are still very rare in Brazil. Therefore, the objective of the present study was to demonstrate the feasible methodology of field survey and to characterize the WD along a...
Article
The concept of connectivity aims to understand the hydrosedimentological (water and sediments) processes that occur in the catchment and influence the water and sediment transfer at different spatial-temporal scales. Connectivity is often assessed through connectivity indexes, commonly considering only structural features of the landscape. The pres...
Article
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Floods occurring in alluvial fans are very peculiar and hazardous, due to the mobility of the channel in the regions. Such mobility increases the uncertainty of the course to be occupied by the water or the debris flow, which makes hazard mapping more complex. Since the flow in alluvial fans is three-dimensional, the flood mapping in these regions...
Article
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Esse artigo traz uma revisão da literatura brasileira sobre índices de vulnerabilidade às inundações, onde foram analisados 21 artigos publicados entre os anos de 2006 até julho de 2019. Verifica-se que 85% dos estudos ocorreram após o ano de 2015, tema recente no país. A escala de aplicação mais utilizada foi a de setor censitário com base em indi...
Preprint
Full-text available
This paper provides a state-of-art account on flood vulnerability indices, highlighting worldwide trends and future research directions. A total of 95 peer-reviewed articles published between 2002–2019 were systematically analyzed. An exponential rise in research effort is demonstrated, with 80 % of the articles being published since 2015. The majo...
Technical Report
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Eventos extremos de precipitação e processos subsequentes são fenômenos naturais recorrentes relacionados à variabilidade e dinâmica terrestre. Contudo, nas últimas décadas houve um significativo aumento das condições de risco associadas a esses eventos. Este acréscimo está estritamente relacionado a questões evolutivas da urbanização. A falta de c...
Article
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Index-based approaches are widely employed for measuring flood vulnerability. Nevertheless, the uncertainties in the index construction are rarely considered. Here, we conducted a sensitivity analysis of a flood vulnerability index in the Maquiné Basin, Southern Brazil, considering distinct normalization, aggregation, classification methods, and th...
Article
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The development of urban areas exacerbates flood risk by increasing both runoff and the exposure of population and infrastructure. In this study, we highlight the importance of return period choice on flood hazard degree and flood hydraulics characteristics. We use the UFSC campus basin as a test bed and combine a hydrological and a hydrodynamic mo...
Conference Paper
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A Trilha do Rio do Boi, destino muito procurado por turistas que desejam realizar atividades em ambientes naturais, adota um critério de fechamento para manter as condições de segurança de quem realiza o trajeto. Atualmente, esse critério está baseado no nível em que se encontram os principais cursos de água dessa bacia hidrográfica. Entretanto, co...
Conference Paper
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A procura pela realização de atividades de ecoturismo tem aumentado muito nos últimos anos, sendo que uma maior proximidade com o ambiente natural apresenta diversos benefícios. Entretanto, quando não bem gerenciado, o ecoturismo pode apresentar alguns pontos negativos. Nesse ponto, pode ser citada a exposição dos turistas aos perigos naturais, ent...
Conference Paper
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Os estudos sobre desastres associados a perigos naturais são divididos em duas abordagens com ênfases distintas e tratadas como opostas: ênfase no fator natural ou no fator social. Entretanto, o desastre natural não é produto unicamente de uma dimensão natural ou de uma dimensão social, mas se constitui das interações mútuas entre fatores sociais e...
Article
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O conhecimento depende da existência de dados. A hidrologia moderna tem sido, prioritariamente, pautada em dados quantitativos provenientes das estações de monitoramento. No entanto, outras fontes podem fornecer dados relevantes ao avanço da hidrologia como demonstrado por pesquisadores desde a década de 1970. O panorama geral sobre o assunto evide...
Chapter
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Dentro deste contexto, o presente capítulo assume como premissas que: (i) ao enfocar no estudo de desastres naturais é necessário reconhecer a interface entre o fatores sociais e naturais que desencadeiam os mesmos; (ii) os conhecimentos sobre a água são relevantes independente do tipo de desastre natural; e (iii) compreender as interações bidireci...
Article
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In this paper we synthesize the special sessions of the XXIII Brazilian Water Resources Symposium 2019 in order to understand the major advances and challenges in the water sciences in Brazil. We analyzed more than 250 papers and presentations of 16 special sessions covering topics of Climate Variability and Change, Disasters, Modeling, Large Scale...
Article
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Understanding the sediment yield and transport is one of the major topics of hydrosedimentology today. Although there are several methods to evaluate the incipient movement, the Shields model is mostly-used. However, the model proposed by Shields assumes that the sediments are uniform in an homogeneous and non-cohesive mixture. As such conditions a...
Article
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Water is an essential natural resourceto all forms of life; however, antropic activity, population increase and urbanization are changing the quality of shallow springs and making them unavailable for certain uses. Groundwater emerges as alternative to complete or even replace surface water; however, it is essential to have control over antropic ac...
Article
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This work is a review about the use of hysteresis to quantify sediment discharge dynamics. We reviewed 71 journal articles from the year 1953 to the present day focusing on two topics: the factors that influence hysteresis; and hysteresis quantification. The main factors influencing hysteresis are: (a) magnitude and sequence of events; (b) sediment...
Article
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A leptospirose é uma das doenças de veiculação hídrica que mais preocupam o setor de saúde no Brasil. Portanto, o objetivo deste artigo foi, por meio de levantamento de trabalhos existentes, identificar, analisar e descrever os fatores socioeconômicos, ambientais e climáticos que podem estar diretamente relacionados ao aumento dos casos de leptospi...
Article
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A caracterização fractal da rede de drenagem de uma bacia hidrográfica surge da necessidade de se compreender a ocorrência de fenômenos hidrológicos, considerando a influência de fatores geomorfológicos. Desta forma, características físicas e fractais de uma bacia hidrográfica integram elementos importantes para análise de seu comportamento hidroló...
Article
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A conectividade de sedimentos pode ser entendida como a transferência de sedimentos entre diferentes compartimentos da paisagem através das relações entre seus componentes. Isso ocorre, principalmente, por meio da interação entre processos hidrológicos e sedimentológicos, os quais, por sua vez, são controlados por características geomorfológicas....
Preprint
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Abstract. The objective of the present study was to determine the spatial behaviour of the Soil Water Index (SWI) by applying a distributed version of the Tank Model (D-Tank Model) to the Araponga river basin (5.26 ha) in southern Brazil and to verify its reliability through the comparison to soil moisture estimated with the measured water-tension...
Article
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Generally, the base for any flood mapping is the topography information whose resolution determines the map accuracy. Furthermore, river bathymetry in detail and the type of used model are also relevant. Therefore, the objective of the present study was to evaluate the influence of different sources of topographic data on the flood mapping by using...
Conference Paper
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RESUMO-Cabeça d'água é o nome pelo qual se conhece, em grande parte do Brasil, eventos de cheia repentinos que ocorrem, tipicamente, em rios e córregos de grande declividade localizados ao longo de serras e montanhas. As cabeças d'água caracterizam-se por um aumento tão rápido do nível da água e da vazão que podem colocar em perigo de vida as pesso...
Conference Paper
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A ocupação de regiões montanhosas tem crescido nos últimos anos no Brasil, associado também ao aumento de desastres naturais hidrossedimentológicos, como os movimentos de massa e os processos relacionados a produção de sedimentos. Ademais, as mudanças climáticas têm sido responsáveis pelo aumento da frequência de episódios extremos de chuva intensa...
Article
Because connectivity is a key issue for understanding sediment dynamics in catchments, the index of sediment connectivity (IC) can be an important tool for hydrosedimentological studies. The IC depends on factors that promote (upslope area and slope) or reduce connectivity (downslope distance and impedance). Among these factors, the estimation of i...
Conference Paper
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The objective of the present work was to revisit the concept of school catchment through a literature review, to present how to construct it, and to discuss how it is useful for hydrology education and water resources management. Here school catchment is redefined as an experimental catchment that incites citizens to learn sciences while at the sa...
Conference Paper
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Education and knowledge about soil and water sciences contribute to the awareness of best practices for the natural resources conservation. One of the alternatives is the implementation of a school catchment, with the use of playful and creative tools. The present study was performed in a school of urban / rural interaction, making two visits. Acti...
Conference Paper
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The natural disaster is related to the presence of the society that suffers from nature influences and also influences the nature. In the hydrological disasters is notorious the bidirectional interaction between human being and water, which is the object of study of socio-hydrological science. In the Scientific Decade "Panta Rhei-Everything Flows",...
Conference Paper
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There is a gap in knowledge about extreme events due to the difficulty in recording these floods occurs due to their large magnitude and the low frequency. Thus, understanding the variables and hydrological and hydrodynamic processes of past floods may contribute to advance of hydrological sciences. However, "How to extract this information?". This...