Diagnóstico antropogeomorfológico das vertentes do baixo curso da bacia hidrográfica do córrego do Facão – município de Araras (SP).

As alterações provocadas pelo homem nas formas de relevo têm sido dinamizadas durante o processo de expansão da mancha urbana de vários municípios, acarretando distintos prejuízos ambientais, com destaque a intensificação dos processos erosivos, ao assoreamento dos cursos fluviais e consequentemente a ocorrência de enchentes. Dessa forma, o objetivo deste trabalho é analisar as alterações do relevo provocadas pela expansão da mancha urbana do município de Araras (SP) nas vertentes do baixo curso da bacia hidrográfica do Córrego do Facão entre 1997 a 2016. Para compreender as implicações geomorfológicas oriundas da atividade antropogênica no cenário de estudo, utilizaram-se os princípios da Teoria Geral dos Sistemas, os quais proporcionaram a compreensão da área de estudo como um sistema controlado. A confecção das cartas geomorfológicas, de uso e ocupação da terra e de declividade assim como o trabalho de campo possibilitaram coletar dados cuja análise permitiu identificar as feições geomorfológicas ocasionadas pela expansão da mancha urbana na área de estudo. Assim, as principais mudanças constatadas referem-se à alteração na forma do canal em virtude do processo de canalização, a diminuição das rupturas topográficas naturais e o surgimento das feições erosivas lineares. Slopes anthropogeomorphological diagnosis of low course of Facão’s stream watershed – Araras city, São Paulo (SP) A B S T R A C TThe alterations caused by the man in the landforms have been dynamized during the process of urban growth, resulting different environmental damages mainly intensification of erosive process, silting of rivers and consequently the occurrence flooding. Thereby, the aim of this work is to analyze the alterations caused by the urban growth of Araras city (SP) in the slopes of low course of Facão’s stream watershed from 1997 to 2016. To understand the geomorphological implications coming from anthropogenic activities in the study area in this time, the principles of Systems General Theory which allowed the comprehension of area as controlled system due to anthropic interference. The confection of geomorphological map, land cover map and declivity map as well as fieldwork allowed to collect data whose analyses made it possible to identify the geomorphological features brought by the urban growth. Therefore, the main changes observed refer to alteration in the feature of waterway due to process of channeling, decrease natural topographic breaks and advent erosive features.Keywords: anthropogeomorphology; geomorphological cartographic; land cover dynamics; slope.

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Urban Growth Influence on Land Cover Dynamics across Obio/Akpor Port Harcourt, Nigeria

Asian Journal of Advanced Research and Reports ◽

10.9734/ajarr/2020/v13i430312 ◽

2020 ◽

pp. 1-11

Author(s):

Mark Ogoro ◽

Eze Allen Uche ◽

Dollah Osademe Chukwudi

Keyword(s):

Land Cover ◽

Urban Growth ◽

Anthropogenic Activities ◽

Water Bodies ◽

Landsat Images ◽

Swamp Forest ◽

Surface Cover ◽

Port Harcourt ◽

Land Cover Dynamics ◽

Rivers State

The study examined urban growth and land cover dynamics across Obio/Akpor, Local Government Area Rivers State. Landsat images were derived for the period of 1986 which was regarded as the base year, 2010 and 2018. The images were imported and analyzed using the spatial analysis tools in the ArcGIS environment to determine the extent of growth induced by change in features (water bodies, swamp forest, other forest, and Anthropogenic/built-up) coverage across the region. Findings revealed that there was a continuous decrease in the areas covered by water bodies, swamp forest, and forest between the periods of 1986 through 2010. It also revealed an increase in anthropogenic activities during the same periods of 1986 through 2018. As at 2018, as compared to 1986 which serves as the base year, there was a noticeable decrease in land area covered by water, in the tune of 13.946 sq km in 2018 as against 20.433 sq km in 1986 amounting to 68 percent decrease in surface covered by water bodies. Also, as at 2018, as compared to 1986 there is a noticeable decrease in the surface covered by swamp and other forest types in the tune of 18.102 and 99.693 sq km respectively as compared to 4.,986 and 17.498 sq km of surface cover respectively. On the other hand anthropogenic altered surfaces had a level of increase in the area covered by Anthropogenic/built-up developmental activities as at 2018 amounting to a tune of 14.399 sq km of surface area altered by anthropogenic activities as at 2018 as compared to 38.267 sq km of surface cover altered by human activities as at 1986 which when compared gave an increase in area covered by anthropogenic activities indicating an increase of over 100 percent between the base year of 1986 through 2018.

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SPATIO-TEMPORAL ANALYSIS AND MODELING OF URBAN GROWTH OF BIRATNAGAR CITY, NEPAL

ISPRS Annals of Photogrammetry Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-annals-iv-5-w2-97-2019 ◽

2019 ◽

Vol IV-5/W2 ◽

pp. 97-102

Author(s):

S. Shrestha

Keyword(s):

Land Use ◽

Land Cover ◽

Urban Growth ◽

Urban Expansion ◽

Urban Change ◽

Support Vector ◽

Land Use Land Cover ◽

Spatial Metrics ◽

Land Cover Map ◽

Spatio Temporal

Abstract. Increasing land use land cover changes, especially urban growth has put a negative impact on biodiversity and ecological process. As a consequences, they are creating a major impact on the global climate change. There is a recent concern on the necessity of exploring the cause of urban growth with its prediction in future and consequences caused by this for sustainable development. This can be achieved by using multitemporal remote sensing imagery analysis, spatial metrics, and modeling. In this study, spatio-temporal urban change analysis and modeling were performed for Biratnagar City and its surrounding area in Nepal. Land use land cover map of 2004, 2010, and 2016 were prepared using Landsat TM imagery using supervised classification based on support vector machine classifier. Urban change dynamics, in term of quantity, and pattern was measured and analyzed using selected spatial metrics and using Shannon’s entropy index. The result showed that there is increasing trend of urban sprawl and showed infill characteristics of urban expansion. Projected land use land cover map of 2020 was modeled using cellular automata-based approach. The predictive power of the model was validated using kappa statistics. Spatial distribution of urban expansion in projected land use land cover map showed that there is increasing threat of urban expansion on agricultural land.

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Riscos Geomorfológicos No Município De Caicó-RN

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v13.2.p434-448 ◽

2020 ◽

Vol 13 (2) ◽

pp. 434

Author(s):

Andréa Dryelle Santos ◽

Saulo Roberto Vital

Keyword(s):

Land Cover ◽

Environmental Planning ◽

Census Data ◽

Sparse Vegetation ◽

Geomorphological Mapping ◽

Geomorphological Map ◽

Geomorphological Units ◽

Land Cover Map ◽

Bodies Of Water

Este estudo tem por objetivo apresentar uma proposta de mapeamento dos riscos geomorfológicos do município de Caicó, utilizando bases compostas por informações geomorfológicas (unidades geomorfológicas e declividade), cobertura da terra e dados censitários. Para realização do mapeamento geomorfológico procurou-se seguir a metodologia de compartimentação geomorfológica do relevo em táxons, proposta por Ross (1992), permitindo identificar uma unidade morfoestrutural, duas unidades morfoesculturais, uma subunidade morfoescultural e cinco modelados, sendo quatro de denudação e um de acumulação. Com a elaboração do mapa de declividade, constatou-se a predominância de zonas pedimentares, cujo nível de ondulação varia majoritariamente entre plano e suave-ondulado. A partir do mapa de uso e cobertura da terra do município, constatou-se uma hegemonia da vegetação esparsa e do solo exposto nas zonas pedimentares, e a presença de vegetação densa em superfícies elevadas ou em contato com pequenos corpos hídricos. Com a análise dos mapas censitários podemos estabelecer se existe ou não a ocorrência de áreas de risco em ambientes urbanos. Os resultados obtidos mostram que todos os mapas elaborados no presente trabalho, fornecem subsídios ao planejamento e zoneamento dos riscos e ao ordenamento do território do município de Caicó. Geomorphological Risks in the Caicó (RN) Municipality A B S T R A C TThis study aims to present a proposal for mapping geomorphological risks in the municipality of Caicó, using bases composed of geomorphological information (geomorphological units and slope), land cover and census data. For the extraction of geomorphological data, we sought to follow the methodology of geomorphological compartmentation of the relief in taxa, proposed by Ross (1992) and Brasil (2009), with adaptations for the semiarid environment. With regard to social data, the 2010 censo was used. From the elaboration of the geomorphological map, the predominance of pedestrian zones was found, whose level of undulation varies mainly between plane, smooth-wavy to moderately-wavy. Through the land cover map, it was possible to verify a hegemony of sparse vegetation and exposed soil in pedestrian zones, and the presence of dense vegetation on elevated surfaces or in contact with small bodies of water. With the analysis of census maps, in turn, we can establish relationships between physical and human variables, for the determination of socio-environmental vulnerability zones. Therefore, it should be noted that the data presented here will serve as a subsidy for urban and environmental planning in the municipality of Caicó. Keywords: Geomorphological Mapping. Geomorphological Risks. Caicó-RN.

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Assessment of land use land cover dynamics and urban growth of Kanksa Block in Paschim Barddhaman District, West Bengal

GeoJournal ◽

10.1007/s10708-020-10292-3 ◽

2020 ◽

Author(s):

Shyamal Dutta ◽

Sanat Kumar Guchhait

Keyword(s):

Land Use ◽

Land Cover ◽

Urban Growth ◽

West Bengal ◽

Land Use Land Cover ◽

Land Cover Dynamics

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Urban Growth Assessment of Chennai District by Remote Sensing and Gis Techniques

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f9059.038620 ◽

2020 ◽

Vol 8 (6) ◽

pp. 5119-5125

Keyword(s):

Remote Sensing ◽

Land Use ◽

Land Cover ◽

Urban Growth ◽

Satellite Images ◽

Remote Sensing And Gis ◽

Land Use Land Cover ◽

Gis Techniques ◽

Land Cover Map ◽

Landsat Satellite

Urban growth of Chennai district is exponential and heading towards extreme urbanisation. Hence this necessitates the study of urban growth in Chennai district. The recent advancement in Remote sensing and GIS has an excellent ability to derive various data from the satellite images obtained .This helps us to map, monitor and picturise various aspects of development with respect to their demands. The basic principle of remote sensing is followed as the methodology. By following the methodology correctly and by proper processing of the data acquired from the satellite images, the exact requirements of information can be obtained. The Change in the urban growth of the Chennai district for three decades from 1989 to 2019 have been found by using remote sensing and GIS techniques. The satellite images of various years are obtained from Landsat satellite from the USGS Earth Explorer .The Land use characteristics of Chennai district of each year can be obtained by preparing the land use land cover map of Chennai district by the use of landsat satellite images. The two software namely ArcGIS and ERDAS Imagine are used to create the Land use land cover map. From the Land use land cover map of Chennai district, the change detection and statistical analysis of three decades are done and these analysis clearly shows that the urban growth of Chennai district is constantly increasing and there is a huge decrease in other natural features such as vegetation, water body and barren land. By performing urban trend analysis the urban growth of Chennai district for the upcoming years are predicted to prove the urban agglomeration in Chennai district.

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Analysis for Mapping of Built-Up Area Using Remotely Sensed Indices – A Case Study of Rajarhat Block in Barasat Sadar Sub-Division in West Bengal (India)

Journal of Landscape Ecology ◽

10.2478/jlecol-2018-0007 ◽

2018 ◽

Vol 11 (2) ◽

pp. 67-76 ◽

Cited By ~ 1

Author(s):

Debashish Kumar Ghosh ◽

Anukul Ch Mandal ◽

Raja Majumder ◽

Poly Patra ◽

Gouri Sankar Bhunia

Keyword(s):

Land Cover ◽

Urban Growth ◽

Satellite Data ◽

Growth Pattern ◽

West Bengal ◽

Remotely Sensed ◽

Decision Makers ◽

Urban Planner ◽

Land Cover Dynamics

Abstract Present study investigated mapping and monitoring urban land areas from Landsat8 satellite data using remotely sensed indices. The normalized difference built-up index (NDBI), Enhanced Built-Up and Bareness Index (EBBI), Index-based built-up index (IBI), urban index (UI), normalized difference bareness index (NDBaI) were used to extract the built-up area. The NDBI was more effective at discriminating built-up areas and at increasing accuracy (overall accuracy of 76.45 % and kappa accuracy of 57 %) of the built-up density percentage than other remotely sensed indices. Evidence on built-up area change geographically would permit urban planner and decision makers to comprehend and appraise urban growth pattern in regards to land cover dynamics.

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