scholarly journals Caracterização geomorfológica e morfométrica do gráben do rio Goiana – Pernambuco (Geomorphological and morphometric characterization of Graben the Goiana river – Pernambuco)

2016 ◽  
Vol 9 (6) ◽  
pp. 1928
Author(s):  
Jaqueline Carla Roque Vicente ◽  
Max Furrier ◽  
Gabriel Da Nóbrega Monteiro
Keyword(s):  
Morphological Analysis ◽  
Drainage Pattern ◽  
Digital Elevation ◽  
Recent Tectonics ◽  
Past Data ◽  
Elevation Model ◽  
Index Value ◽  
Anthropogenic Intervention ◽  
Morphometric Characterization

Esse trabalho visa fazer a caracterização neotectônica da área de estudo por meio da análise morfológica da rede de drenagem e de cálculos morfométricos destinados à detecção de tectônica recente. A área em questão está localizada em um gráben pós-mioceno onde podem ser observados riscos geológico-geomorfológicos e impactos ambientais provenientes da intensa intervenção antropogênica. Para a realização desse estudo fez-se necessário uma pesquisa e o levantamento de dados pretéritos sobre a área de estudo tomando como base os dados obtidos por meio da vetorização das cartas topográficas de Goiana e Tejucupapo na escala de 1:25.000 com equidistância das curvas de nível de 10 m. Foram utilizadas técnicas de geoprocessamento para geração dos produtos cartográficos: cartas hipsométrica, de declividade e o Modelo Digital de Elevação (MDE). Os cálculos morfométricos aplicados para a análise neotectônica foram o Índice Relação Declividade/Extensão (RDE) e o índice Razão Fundo/Altura de Vale (RFAV). Os resultados obtidos indicam uma forte influência neotectônica no padrão de drenagem da área, assim como também, fica evidenciado a interferência antropogênica presente na área investigada e suas adjacências.  A B S T R A C T This article aims to make neotectonics characterization of the study area by making the morphological analysis of the drainage network and morphometric calculations for the recent tectonics detection. The area in question is located in a post-Miocene graben where it can be observed geological and geomorphological hazards and environmental impacts from intense anthropogenic intervention. For the realization of this study was necessary research and survey of past data on the study area based on the data obtained through vectorization of topographic maps of Goiana and Tejucupapo on the scale of 1:25.000 with equidistance of 10 m curves level. Geoprocessing techniques were used for generation of cartographic products: hipsometric letters, slope and digital elevation model (DEM). Morphometric calculations applied to the neotectonic analysis were the Index Value Slope/Extension (RDE) and the index Reason Fund/Valley Height (RFAV). The results indicate a strong neotectonics influence in the drainage pattern of the area, as also evidenced anthropogenic interference present in the investigated area and its surroundings. Keywords: Graben of the Goiana River; neotectonics; anthropogenic interventions.

scholarly journals MORPHOMETRIC CHARACTERIZATION OF THE HYDROGRAPHIC BASIN OF JAUQUARA RIVER IN THE TRANSITION BETWEEN THE CERRADO AND AMAZON BIOMES IN MATO GROSSO-BRAZIL

FLORESTA ◽  
2019 ◽  
Vol 49 (2) ◽  
pp. 325
Author(s):  
Gabriel Americo Cassettari ◽  
Tadeu Miranda De Queiroz
Keyword(s):  
Shuttle Radar Topography Mission ◽  
Mato Grosso ◽  
Digital Elevation ◽  
Circularity Index ◽  
Elevation Model ◽  
Basin Area ◽  
Morphometric Characterization ◽  
Effective Water ◽  
Unpublished Information

This study aimed to perform the Jauquara river watershed morphometric characterization. To watershed delimitation was used SRTM 30 type Digital Elevation Model (Shuttle Radar Topography Mission, with spatial resolution of 30 m) provided by USGS Earth Explorer platform. The geographic information system used to watershed delimitation process and maps generation was ArcGIS 10.1 from ESRI®. The morphometric variables calculus was based on classic methodologies of Applied Hydrology. The watershed has an area of 1408,03 km2 and perimeter of 288,43 km with compactness coefficient and circularity index of Kc = 2.15 and Ic = 0.21, respectively, which show an elongated shape. The drainage was classified as 5th order, reinforcing the configuration of the drainage network with a wide hydric distribution. The predominant altitude range is between 368 and 552 m, which corresponds to an area of 478.10 km2. It was observed that there is a predominance of smooth-wavy and undulated reliefs (3-8%, 8-20% slope), which correspond to 38,05% and 23,04% of the total basin area respectively. The morphometric characterization of the basin made it possible to obtain unpublished information that contributes to the decision making regarding the effective water management in the studied area, being this a guiding study for other works

Analysis of Morphometric Variables of River Espinharas Hydrographic Sub-basin Using Geographic Information System

2019 ◽  
pp. 1-18
Author(s):  
Felipe Silva de Medeiros ◽  
Joedla Rodrigues de Lima ◽  
Roberta Patrícia de Sousa Silva ◽  
Sérvio Túlio Pereira Justino ◽  
Amanda De Lira Freitas ◽  
...  
Keyword(s):  
Land Use ◽  
Agricultural Practices ◽  
Landsat 8 ◽  
Shuttle Radar Topographic Mission ◽  
Digital Elevation ◽  
Geospatial Tools ◽  
Intensity Class ◽  
Elevation Model ◽  
Morphometric Characterization

The relief forms, terrain differences, soil type and flora are the most important indicators for the description of a river basin or drainage network. The present work had as objectives, to perform the morphometric characterization of the hidrographic sub-basin (SBH) of the Espinharas river; analyze the intensity of land use; suggesting mitigating measures in areas with greater intensity of use, with the help of geospatial tools. The sub-basin of the Espinharas river, extends through thirty-one (31) municipalities, covering the states of Paraíba, Rio Grande do Norte and Pernambuco. For the analysis, images were used, from the Digital Elevation Model (DEM), Shuttle Radar Topographic Mission (SRTM), and Landsat 8 satellite images, resolution 30 m, bands 2, 3 and 4. Next, with QGIS software aid 2.18.17 generated the map of slope, mapping of intensity and land use, later calculations of the morphometric variables, and finally elaborated proposals of mitigating measures for the degradation of the sub-basin. The results of the morphometric parameters found for the Sub-basin indicate values of the Compass coefficient of 2.68 and Form factor 0.32, indicating that the sub-basin presents an irregular shape that differs from the figure of a circle, approaching an elongated shape, and thus not conducive to flooding. In relation to the intensity of use, the areas with low intensity class of use have the largest representation in this basin, covering an area of 2,147.98 km² (65.27%). The Espinharas river sub-basin presents several nonconformities of environmental impacts generated mainly by bad planning of use of the area and disrespect to the legislation. In this case, it is necessary for research to support effective public policies that favor less impacting agricultural practices, allowing farmers to provide their livelihoods at the same time, allowing future generations to survive in the semi-arid.

scholarly journals MORPHOMETRY OF THE HYDROGRAPHIC BASINS INSERTED IN THE URBAN AREA OF DOURADOS – MS – BRAZIL

2019 ◽  
Vol 46 (3) ◽  
pp. 75
Author(s):  
Leonardo Lima dos Santos ◽  
Vinícius De Oliveira Ribeiro ◽  
Jonailce Oliveira Diodato
Keyword(s):  
Urban Area ◽  
Drainage Density ◽  
Water Quantity ◽  
Digital Elevation ◽  
Circularity Index ◽  
Physical Variables ◽  
Elevation Model ◽  
Gis Software ◽  
Morphometric Characterization

The morphometric characterization of watersheds has great importance and appliance for the prediction of phenomena such as floods. The objective of this study was to delimitate and characterize morphometrically the hydrographic basins that encompass the urban area of the Municipality of Dourados / MS – Brazil, which derived from estimated physical variables obtained by applying a license-free GIS software. Based on a Digital Elevation Model (DEM), the following microcatchment characteristics were determined: area, perimeter, slope, altitude, and watercourse orders. Four morphometric parameters that express a direct or inverse relationship with the water quantity factors of a hydrographic source were calculated and analyzed, being them: compactness coefficient, shape factor, circularity index, and drainage density. By comparing the studied basin results, it was observed that Água Limpa, Água Boa, and Laranja Azeda basin streams are more susceptible to flooding, especially considering the measurement factor and drainage density.

scholarly journals Caracterização morfométrica da bacia hidrográfica do igarapé da Prata, Capitão Poço – Pará – Brasil

2016 ◽  
Vol 11 (3) ◽  
pp. 143 ◽  
Author(s):  
Rodrigo Silvano Silva Rodrigues ◽  
Lindemberg Lima Fernandes ◽  
Diêgo Lima Crispim ◽  
Artur Sales de Abreu Vieira ◽  
Francisco Carlos Lira Pessoa
Keyword(s):  
Structural Control ◽  
Drainage System ◽  
Drainage Density ◽  
Annual Rainfall ◽  
Digital Elevation ◽  
Circularity Index ◽  
Major Floods ◽  
Elevation Model ◽  
Index Value

<p>Este trabalho teve como objetivo realizar a caracterização morfométrica da bacia hidrográfica do igarapé da Prata, localizado no município de Capitão Poço, Pará. Inicialmente gerou-se o Modelo Digital de Elevação a partir de SRTM com resolução espacial de 30 m, utilizando o sistema de informações geográficas, por meio do software ArcGis 10.1 e da extensão ArcHydro, foram calculados alguns parâmetros morfométricos para o estudo do comportamento hidrológico da bacia. A área de drenagem encontrada foi de 115,283 km² e o perímetro de 70,151 km. A bacia hidrográfica do igarapé da Prata tem formato alongado, coeficiente de compacidade de 1,829, fator de forma de 0,356 e índice de circularidade de 0,294. A densidade de drenagem obtida para a bacia foi de 0,525 km/km², com padrão dendrítico. A forma mais alongada da bacia hidrográfica indica que a precipitação pluviométrica sobre ela se distribui em diferentes pontos. De maneira geral, suas características morfométricas denotam um controle estrutural da drenagem eficiente, bem como menor risco de grandes cheias em condições normais de pluviosidade anual e topografia favorável ao escoamento superficial.</p><p align="center"><strong><em>Morphometric characterization of Prata catchment, Capitão Poço – Pará – Brazil</em></strong></p><p><strong>Abstract:</strong> This study aimed to characterize the morphometric Prata catchment, located in the municipality of the Capitão Poço/PA. In order to do so, a Digital Elevation Model (DEM), spatial resolution of 30 meters, using as database and analysis the system of geographic information, by means of the ArcMap 10.2 and ArcHydro systems. From this, some morphometric parameters of a previous study on the hydrologic behavior of the watershed were calculated. The drainage area was 115,283 km² and 70,151 km in perimeter. The Prata catchment was proven not easily subject to floods as the compacity coefficient was far from the unit (1,829) and its shape factor presented a low value (0,356). Such fact can still be proven by the circularity index value (0,294). The drainage density was 0,525 km/km². The drainage system forms a dendritic pattern. The more elongated watershed shape indicates that the rainwater volume that falls within the watershed is concentrated in different points. The morphometric characteristics denote a structural control of efficient drainage, lower risk of major floods in normal annual rainfall and topography favorable to runoff.</p>

scholarly journals Morphometric analysis and prioritization of upper Benue River watershed, Northern Nigeria

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Caleb Akoji Odiji ◽  
Olaide Monsor Aderoju ◽  
Joseph Bisong Eta ◽  
Idris Shehu ◽  
Adama Mai-Bukar ◽  
...  
Keyword(s):  
Management Strategies ◽  
Decision Makers ◽  
Order System ◽  
Hydrological Process ◽  
Drainage Pattern ◽  
River Watershed ◽  
Digital Elevation ◽  
Hypsometric Integral ◽  
Cumulative Length ◽  
Elevation Model

AbstractThe upper Benue River watershed is undergoing remarkable modifications due to man-made and natural phenomena. Hence, an evaluation is required to understand the hydrological process of the watershed for planning and management strategies. This study aimed to assess the morphometric characteristics and prioritize the upper Benue River watershed. The boundary of the watershed and sub-watersheds, as well as stream networks, was extracted from the digital elevation model (DEM) coupled with hydrological and topographic maps. Twenty-eight morphometric parameters under three categories, i.e. linear, areal, and relief aspects were computed and mapped. Findings from the study revealed that the watershed is a seventh stream order system characterized by a dendritic drainage pattern. The result also showed that 4821 streams were extracted with a cumulative length of 30,232.84 km. The hypsometric integral of the watershed was estimated to be 0.22, indicating that it is in the old stage. In the prioritization of the watershed, the morphometric variables were utilized to calculate and classify the compound factor. The result showed that sub-watersheds 12, 16, 18, 24, 26, and 27 were ranked as very high priority for which conservation measures are required to mitigate the risk of flood and erosion. The outcome of this study can be used by decision-makers for sustainable watershed management and planning.

scholarly journals Morphometric Characterization of Small Cell Lymphocytic Lymphoma

2014 ◽  
Vol 20 (4) ◽  
pp. 179-183
Author(s):  
Anca Chisoi ◽  
Mariana Aşchie ◽  
I. Poinăreanu
Keyword(s):  
Small Population ◽  
Small Cell ◽  
Nuclear Area ◽  
Cytoplasmic Area ◽  
Irregularity Index ◽  
Microscopic Features ◽  
Field Measuring ◽  
Index Value ◽  
Morphometric Characterization

Abstract The morphometry in histopathology is used to characterize cell populations belonging to different tissues and to identify differences in their parameters with prognostic implications. To achieve morphometric examination were selected 6 of 24 cases identified as small cell lymphocytic lymphoma. For each case analysis was done on five fields, for each field measuring the parameters of 20 cells. The studied parameters were for cytoplasm: cytoplasmic area, maximum and minimum cytoplasmic diameter, cytoplasmic perimeter; for nucleus were measured: nuclear area, minimum and maximum nuclear diameter, nuclear perimeter, nuclear contour index, nuclear ellipticity index, nuclear irregularity index. Also the nucleocytoplasmic ratio was calculated in all studied cases. Small cell lymphocytic lymphoma is characterized in morphometric terms having a small cytoplasmic area (average 29.206) and also a small nuclear area (mean 28.939) having a nucleo-cytoplasmic ratio appearance suggestive for adult lymphocyte. A nuclear contour index small value (3.946), ellipticity index value also small (3.521) and small nuclear irregularity index (3.965). Standard deviations, in any of the studied morphometric categories, is around or below 1 suggesting monomorphic cell appearance. These morphometric and microscopic features characterized mainly by a small population of adult lymphocytes, monomorphic, with rounded hipercromic nuclei, dense chromatin, support the framing into indolent lymphoma group in terms of clinical outcome.

scholarly journals The UAS-Based 3D Image Characterization of Mozarabic Church Ruins in Bobastro (Malaga), Spain

2020 ◽  
Vol 12 (15) ◽  
pp. 2377
Author(s):  
Carlos Enríquez ◽  
Juan Manuel Jurado ◽  
Alexandro Bailey ◽  
Danilo Callén ◽  
María José Collado ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Archaeological Site ◽  
Semantic Classification ◽  
Spatial Features ◽  
Digital Elevation ◽  
Dense Point ◽  
Critical Slope ◽  
Rgb Images ◽  
Elevation Model

In recent years, the application of geomatics tools in archaeology has proved to be very useful to obtain meaningful knowledge of the 3D reconstruction of archaeological remains and semantic classification of the 3D surface. These techniques have proven to be an effective solution for the 3D modeling and the extraction of many spatial features on an archaeological site. However, novel methodologies as well as new data exploitation strategies are required to exploit these geospatial data for natural and cultural heritage documentation, monitoring, and preservation. In this paper, we have studied unique archaeological ruins, a Mozarab church in Al-Andalus, using high-resolution RGB images, which was taken by a drone. Thus, a 3D reconstruction of the ruins and the surrounding environment is carried out in order to characterize it on a dense point cloud. Then, a digital elevation model (DEM) was calculated in order to identify critical slope lines, which are significant to determine where the structure of the church was built. Our results can be used for the development of an architectural project and thus a virtual recreation of these archaeological ruins was performed.

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