Effects of Urbanization on Black Soil: A Remote Sensing Perspective

2014 ◽  
Vol 535 ◽  
pp. 478-482 ◽  
Author(s):  
Xiao Yan Li ◽  
Hong Li ◽  
Hui Jia Liu
Keyword(s):  
Remote Sensing ◽  
Black Soil ◽  
Rapid Expansion ◽  
Soil Types ◽  
Soil Resources ◽  
Gis And Remote Sensing ◽  
Average Value ◽  
Changchun City ◽  
Impact Of Urbanization ◽  
The Impact

Urbanization is considered to be one of the most important human activities in the recent history of China. Northeast China is one of the fastest urbanizing areas in the country with its urban population proportion increasing from 23.8% in 1942 to 32.8% in 32.8%, and to about 47% which is about the same as the world average value. This is a case study conducted in Changchun city to evaluate the impact of urbanization on soil resources using Geographic Information Systems (GIS) and remote sensing. The extent of urban land in the study area and the impact of urban sprawl on soil resources at a scale of 1:500,000 were estimated. The soil types occupied by the urbanization processes were determined by overlaying the soil map on the satellite images (Landsat TM and CBERS-2) of the study area at different times (1986, 1995, 2000 and 2005). The results documented the rapid expansion of urbanization in Changchun city, as well as the soil types occupied by the urbanization process. Results showed that, the urban increased by 76.8% during the past two decades and the loss of black soil accounted more than 70% of all soil loss. Growing urbanization may threaten food security, soil diversity and sustainability.

scholarly journals ASSESSING THE IMPACT OF URBANIZATION ON DIRECT RUNOFF IN DISTRICT 8, HO CHI MINH CITY

2021 ◽  
Vol 11 (3) ◽  
pp. 145-156
Author(s):  
Van Minh NGUYEN ◽  
Elena Yurievna ZAYKOVA
Keyword(s):  
Remote Sensing ◽  
Surface Runoff ◽  
Soil Conservation ◽  
Curve Number ◽  
Ho Chi Minh City ◽  
Soil Conservation Service ◽  
Impact Of Urbanization ◽  
Service Curve ◽  
The Impact ◽  
Scs Cn

Ho Chi Minh City (HCMC) is among the cities that are most at risk of fl ooding worldwide. Urbanization processes have led to a change in land use, which in turn has resulted in an increase in impervious surfaces and runoff , thus again leading to the risk of fl ooding in the city. The aim of the article is to study the impact of urban development (on the example of District 8 of HCMC) on surface runoff using a combination of the interpretation of remote sensing images of the earth (ERS) Google Earth and the SCS-CN model (the Soil Conservation Service curve number). Theoretical models are used to analyze the relationship between the typology of buildings and areas of open and impervious surfaces. The interpretation of remote sensing images was carried out in the ArcGIS program. The method used to calculate surface runoff is the Soil Conservation Service Curve Number (SCS-CN) method developed by the US Soil Conservation Service and is suitable for assessing the eff ects of land-use/land cover change due to urbanization. The results of the study show the volume of surface runoff in areas with diff erent levels of urbanization in district 8 of HCMC, assessing the impact of urbanization processes on surface runoff and revealing new opportunities for managing this process. The combination of remote sensing interpretation and SCS-CN model makes it possible to assess the impact of urban development on surface runoff . Urbanization and an increase in built-up area strongly aff ect fl ooding, reducing the soil retention.

scholarly journals Changes in Mediterranean mesocarnivore communities along urban and ex-urban gradients

2015 ◽  
Vol 61 (5) ◽  
pp. 793-801 ◽  
Author(s):  
Mariano R. Recio ◽  
Carmen M. Arija ◽  
Sara Cabezas-Díaz ◽  
Emilio Virgós
Keyword(s):  
Urban Development ◽  
Urban Areas ◽  
Mediterranean Ecosystems ◽  
Control Area ◽  
Wildlife Habitat ◽  
Domestic Cat ◽  
Rapid Expansion ◽  
Domestic Species ◽  
Impact Of Urbanization ◽  
The Impact

Abstract Urbanization causes wildlife habitat loss, fragmentation, and the replacement of specialist species by generalists and/or exotic taxa. Because mesocarnivores are particularly vulnerable to habitat modifications, the rapid expansion of urban areas and the increasing trend for ex-urban development occurring in Mediterranean ecosystems may be major drivers of change in mesocarnivore communities. We combined camera trapping and sign surveys to quantify the richness and relative abundance of a set of wild and domestic mesocarnivores. We quantified these variables controlling for the gradient of urbanism, ex-urbanism, and other environmental variables in patches of natural vegetation in the region of Madrid (central Spain), and a non-urbanized control area ~220 km south of Madrid city. Using conditional autoregressive models (CAR) and model selection procedures, we found that urbanization influenced mesocarnivore community composition but this influence was not detrimental for all the species tested. Generalist carnivores such as the red fox Vulpes vulpes were more abundant in urban and ex-urban areas. Ex-urban development creates overlapping areas between wild and domestic species (such as the domestic cat Felis catus and the wildcat Felis silvestris) but contact between wild and domestic carnivores in natural areas is unlikely. Detection of species in the control area was very low. Therefore, the impact of urbanization in causing changes in mesocarnivore communities may be less than other factors such as illegal predator culling.

scholarly journals APPLICATION OF REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEM (GIS) TO ANALYSE THE IMPACT OF LAND USE ON THE WETLANDS IN PORT HARCOURT AND OBIO/ AKPOR L.G.A. RIVERS STATE, NIGERIA

2020 ◽  
Vol 8 (5) ◽  
Author(s):  
J. U. Richard ◽  
Ibochi Andrew Abah
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Satellite Image ◽  
Gis And Remote Sensing ◽  
Percentage Decrease ◽  
Detection Analysis ◽  
The People ◽  
Port Harcourt ◽  
Landsat Satellite ◽  
The Impact

The study area is in verge the state of wetlands extinction due to over utilization and lack of regulations that will ensure effective management of its resources. The study areas: Port Harcourt and Obio/ Akpor L.G. As are undergoing rapid urban and industrial expansion due to available natural resources and these activities have degraded the wetlands which hither-to represent the source of living for the people. This study investigated the impact of land use/ land cover on wetlands in Port Harcourt and Obio/ Akpor L.G. As using GIS and remote sensing approach. The study was conducted using Landsat satellite image of 2000, 2007, and 2013 to analysed change in land use/ cover as a result of the aforesaid activities. The supervised classification method in ENVI 5.0 software was adopted and change detection analysis was computed in order to examine change in land use that has impacted on wetlands habitat. The change results show percentage decrease in water body by -0.39% from 2000 to 2007 and -0.70% from 2000 to 2013, built-up areas also increased by 11.95% from 2000 to 2007 and 28.47% from 2000 to 2013. Similarly, wetlands decreased by -13.52% from 2000 to 2013. Therefore, it was concluded that urbanization in built-up, industrial, and dredging activities are the main causes of wetlands loss in the area with most wetlands being converted to built-up areas and dredged sites. The study justified the ability of remote sensing and GIS software for modelling wetlands change over these periods.

scholarly journals GIS and Remote Sensing Analysis of the Impact of Land use Land Cover Change on Forest Degradation: Evidence from the Central Part of Taraba State, Nigeria

2021 ◽  
pp. 27-39
Author(s):  
Umar Jauro Abba ◽  
Adewuyi Taiye ◽  
Yusuf Mohammed Bakoji ◽  
Bashir Babanyaya Mohammed ◽  
Adamu Auwal Umar ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Land Cover ◽  
Local Governments ◽  
Early Stage ◽  
Central Zone ◽  
Google Earth ◽  
Forest Environment ◽  
Gis And Remote Sensing ◽  
Bare Land ◽  
The Impact

Forest is a fundamental, significant, and valuable component of a sustainable environment. Ecosystem services, biodiversity development, and economic growth in any nation depend on the proficient use of forests and their resources. However, deforestation has remained the single most important environmental phenomenon threatening the existence of the forest environment in Nigeria. This study was carried out to assess the exploitation of forestland in the central zone of Taraba state using GIS and remote sensing techniques. The satellite imageries used are Lands at imageries of 2006, 2012, and 2018. Ground Control points (GCPs) were obtained from Google earth to validate the coordinates of the classified imageries. The result obtained from 2006 classification showed that thick forest occupied the total of 1685448.99 ha equivalent to 80.38% and was the highest land cover suffering a decline in the area amounting to 694696 ha which equals to 33.13% in 2018. The pattern of land cover changes at the early stage was restricted to dissection and perforation in 2006. A remarkable expansion of bare land patches accompanied by total attrition of thick forest was identified due North in Bali local government area as compared to Gashaka and Kurmi local governments that have fragmented and little shrinking pattern of changes from 6.87% in 2006 to 37.65% in 2018. This shows that; as bare land increases, thick forests keep on decreasing within thirteen (13) years. It was recommended that increased reforestation efforts, sensitization and periodical campaigns against deforestation, and redesign of the existing forestry laws by the state government to curtail incessant incidents of deforestation in the study area be undertaken.

scholarly journals Impact of Rapid Urban Sprawl on the Local Meteorological Observational Environment Based on Remote Sensing Images and GIS Technology

2021 ◽  
Vol 13 (13) ◽  
pp. 2624
Author(s):  
Yanhao Zhang ◽  
Guicai Ning ◽  
Shihan Chen ◽  
Yuanjian Yang
Keyword(s):  
Remote Sensing ◽  
Urban Sprawl ◽  
Rapid Expansion ◽  
Anthropogenic Heat ◽  
Spatiotemporal Variability ◽  
Remote Sensing Images ◽  
Gis Technology ◽  
Anthropogenic Heat Flux ◽  
Meteorological Observations ◽  
The Impact

Rapid increases in urban sprawl affect the observational environment around meteorological stations by changing the land use/land cover (LULC) and the anthropogenic heat flux (AHF). Based on remote sensing images and GIS technology, we investigated the impact of changes in both LULC and AHF induced by urbanization on the meteorological observational environment in the Yangtze River Delta (YRD) during 2000–2018. Our results show that the observational environments around meteorological stations were significantly affected by the rapid expansion of built-up areas and the subsequent increase in the AHF, with a clear spatiotemporal variability. A positive correlation was observed between the proportion of built-up areas and the AHF around meteorological stations. The AHF was in the order urban stations > suburban stations > rural stations, but the increases in the AHF were greater around suburban and rural stations than around urban stations. Some meteorological stations need to be relocated to address the adverse effects induced by urbanization. The proportion of built-up areas and AHF around the new stations decreased significantly after relocation, weakening the urban heat island effect on the meteorological observations and substantially improving the observational environment. As a result, the observed daily mean temperature (relative humidity) decreased (increased) around the new stations after relocation. Our study comprehensively shows the impact of rapid urban sprawl on the observational environment around meteorological stations by assessing changes in both LULC and the AHF induced by urbanization. These findings provide scientific insights for the selection and construction of networks of meteorological stations and are therefore helpful in scientifically evaluating and correcting the impact of rapid urban sprawl on meteorological observations.

scholarly journals URBAN HEAT ISLAND UNDER IMPACT OF URBANIZATION IN HOCHIMINH CITY FROM REMOTE SENSING DATA

2010 ◽  
Vol 13 (3) ◽  
pp. 103-117
Author(s):  
Van Thi Tran
Keyword(s):  
Remote Sensing ◽  
Surface Temperature ◽  
Urban Heat Island ◽  
Human Health ◽  
Rural Areas ◽  
Heat Island ◽  
Urban Heat ◽  
Surface Urban Heat Island ◽  
Impact Of Urbanization ◽  
The Impact

This paper presents the formation of urban heat island under the impact of urbanization in Hochiminh City in 1989-2006. Urbanization with increasing impervious surfaces impacted the common temperature background over the city by the warm rising trend. The results of applying remote sensing method extracting urban surface temperature defined the magnitude and space extension of “Surface urban heat island”, where the differences of surface temperature between urban and rural areas on 2006 image were about 11oC – 12oC. The magnitude of surface urban heat island increased in 6 to 26 times, particularly the biggest heat island was concentrated in the inner city with the area about 29.000ha. Urban heat island greatly influences the environment and the human health. Therefore, it is necessary to act on reducing the temperature of heat island in order to make our city more friendly to environment, to ensure human health, to decrease the energy demand and waste of water by sustainable development goal.

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