Navegando por Assunto "Watershed"

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Acesso aberto (Open Access)
Análise da influência do uso e ocupação da terra na concentração de sólidos em suspensão em reservatório hidrelétrico com o uso do sensoriamento remoto
(Universidade Federal do Pará, 2022-07-09) SOUZA, Fabíola Esquerdo de; SOARES, Carlos Benedito Santana da Silva; http://lattes.cnpq.br/9153957633685323; ISHIHARA, Júnior Hiroyuki; http://lattes.cnpq.br/3498874642887006; https://orcid.org/0000-0002-0081-7913
The use of remote sensing in reservoir sediment monitoring is important for temporal spac knowledge of sediment deposition in dam structures. In this context, this research was developed in the hydrographic basin that covers the Tucuruí HOU reservoir, in which suspended sediment concentration data from the M1 monitoring station located at 2 km upstream of the dam were acquired, and were integrated into the analyses to understand the relationship between the responses of satellite images and field measurements. Sediment analyses were performed with 14-year time series of MODIS images, composed of 8 days. Surface reflectance estimates were calculated using simplinear regression and coefficient of determination (R2). For the use and occupation of the land of the hydrographic basin, a temporal analysis of Landsat-5, Landsat-8 OLI/TIRS images was performed. Next, the land use and occupation were related to water quality analyses of stations upstream 1 (M1), Amount Repartimento (MR) and Montante Pacurui (MP). The results show that the calibration curve generated the linear regression equation with good fit for MI monitoring station, presenting efficiency in the data estimated by reflectance through this model. The analyses of land use and occupation show that over the years there was a reduction in forest formation and at the same time pasture growth occurred. In relation to water quality, the impacts caused by anthropic actions have negative influences. Thus, it is possible to observe the relevance of the use of remote sensing techniques, geoprocessing and geotechnologies, as instruments that help in the planning of land use and occupation, in the analysis of water quality and management of water resources in reservoir regions, since these technologies enable greater spatial scope of the analyses with lower costs.
Acesso aberto (Open Access)
Dinâmica geoambiental e as transformações da paisagem da bacia hidrográfica do rio Ituna, Pará
(Universidade Federal do Pará, 2024-04-08) BALIEIRO, Bruna Taynara de Souza; VELOSO, Gabriel Alves; http://lattes.cnpq.br/9757471213923099; https://orcid.org/0000-0002-3655-4166
The diversity of public policy incentives and the overlapping of large development projects in the Amazon have made it a complex region, directly influencing the transformations of the landscape and its geoenvironmental dynamics. The study area of this research comprises the Ituna watershed (BHRI), located in the municipalities of Altamira-PA and Senador José Porfírio-PA, currently consisting of six land units, including settlement projects and indigenous land, created under different contexts . Furthermore, the area is under the influence of large projects such as the UHE Belo Monte and speculation about the implementation of the Volta Grande Project (Belo Sun) for mining exploration. Given these factors, the research analyzed the geoenvironmental dynamics and transformations of the BHRI landscape, through changes in land use and cover, over 36 years, considering the context of public policies to encourage forms of land use (land policies and agricultural/agriculture), as well as the insertion and speculation of large projects in its zone of influence. The results point to significant changes on a multitemporal scale, where in 2022 Agriculture represented 60,829.59 hectares (38.67%) and Forestry Formation 95,879.32 hectares (60.96%) of BHRI, it is important to highlight that of this total Forest Formation, 17,464.9533 hectares are located in the Koatinemo TI. The data confirm a substantial increase in the expansion of agriculture and livestock over the BHRI forest. The study also highlights the conservation of the forest in the Koatinemo TI when compared to settlement projects. The study reinforces the complexity of creating and executing developmental policies for the Amazon and how the actions of human beings constantly affect the landscape.
Acesso aberto (Open Access)
Fundamentos para o gerenciamento integrado dos recursos hídricos na microbacia urbana do rio Maguari-Açu com vistas à sustentabilidade hidroambiental
(Universidade Federal do Pará, 2012-08-24) SILVA, Valdinei Mendes da; ABREU, Francisco de Assis Matos de; http://lattes.cnpq.br/9626349043103626
The city of Ananindeua, as part of the Belém Metropolitan Region - BMR, has received the negative impacts resulting from the disorderly occupation of territorial space. The natural conditions of the region have been ignored in this process of urban settlement, which is verified by analyzing the current status of surface and underground water resources, which are being rapidly degraded, because of the lack of interventions, that are primarily that guarantee government control of these impacts or the implementation of actions merely reproduce historical actions without success. The analysis of socioeconomic and hydro-environmental conditions demonstrated the hydro unsustainability of this region, as well as the existence of the various conflicts that refers specifically to water resources. In order to counter this situation, are presented basis for the integrated management of water resources in the urban watershed of the river "Maguari-Acu," which seek to reach this sustainability. Such basis were structured in five (05) actions: 1) Division of BMR in six (6) river basin, 2) Environmental zoning in River Basin of Maguari-Açu, 3) Management of soil sealing and runoff, 4) Strategies of social organization for the management of urban watersheds and 5) management of information from the integrated data base. To support such basis, future scenarios were developed, anchored in the legal framework and the existing technological apparatus, instruments sufficient for integrated actions between the government and society in general, making it possible to undertake the processing needed for the construction or reconstruction of cities from principles of sustainability.