scholarly journals Population dynamics and land cover changes of urban areas

Spatium ◽  
2014 ◽  
pp. 22-29
Author(s):  
Nikola Krunic ◽  
Marija Maksin ◽  
Sasa Milijic ◽  
Olgica Bakic ◽  
Jasmina Djurdjevic
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
Land Cover ◽  
Land Cover Change ◽  
Urban Areas ◽  
Population Change ◽  
Land Cover Changes ◽  
Southeast Europe ◽  
Capital Cities ◽  
Soil Sealing

In order to enable efficient management of spatial development of cities, it is essential to analyse changes in land cover, in the ?consumption? of the land surrounding cities and the attained rationality with respect to the use of already urban land (reflected in the urban population density). This paper provides an overview of the land cover changes in the period between 1990 and 2006, and the potential correlation between the dynamics of the total population change on the one hand, and the land cover change on the other. The initial hypotheses of this paper are: (1) occupation and sealing of productive soil in peri-urban zones is not proportional to the population dynamics of cities and their metropolitan areas; and (2) expansion of soil sealing in peri-urban zones is not significantly affected by the differences with regard to the natural surroundings and historical development of cities, nor by these cities being developed cities or cities in transition, capitalistic or post-socialist cities, etc. These hypotheses are tested and confirmed in the cases of three capital cities in South and Southeast Europe. Regarding the changes in population density, it can be concluded that central/inner-city municipalities became less populated, with sometimes very significant decrease in population density, but without any land cover change, which indicates ?depopulation?. At the same time, outer-city and peripheral municipalities also suffered a decline in population density, while their urban zones extended.

Historical and Future Land-Cover Change in a Municipality of Ghana

2011 ◽  
Vol 15 (9) ◽  
pp. 1-26 ◽  
Author(s):  
Emmanuel M. Attua ◽  
Joshua B. Fisher
Keyword(s):  
Land Cover ◽  
Land Cover Change ◽  
Land Tenure ◽  
Urban Areas ◽  
Poverty Reduction ◽  
Urban Expansion ◽  
Political Stability ◽  
Land Cover Changes ◽  
Natural Ecosystems ◽  
Land Administration

Abstract Urban land-cover change is increasing dramatically in most developing nations. In Africa and in the New Juaben municipality of Ghana in particular, political stability and active socioeconomic progress has pushed the urban frontier into the countryside at the expense of the natural ecosystems at ever-increasing rates. Using Landsat satellite imagery from 1985 to 2003, the study found that the urban core expanded by 10% and the peri-urban areas expanded by 25% over the period. Projecting forward to 2015, it is expected that urban infrastructure will constitute 70% of the total land area in the municipality. Giving way to urban expansion were losses in open woodlands (19%), tree fallow (9%), croplands (4%), and grass fallow (3%), with further declines expected for 2015. Major drivers of land-cover changes are attributed to demographic changes and past microeconomic policies, particularly the Structural Adjustment Programme (SAP); the Economic Recovery Programme (ERP); and, more recently, the Ghana Poverty Reduction Strategy (GPRS). Pluralistic land administration, complications in the land tenure systems, institutional inefficiencies, and lack of capacity in land administration were also key drivers of land-cover changes in the New Juaben municipality. Policy recommendations are presented to address the associated challenges.

Land Cover Change: Does it affect temperature variability?

2021 ◽  
Author(s):  
Aristoklis Lagos ◽  
Stavroula Sigourou ◽  
Panayiotis Dimitriadis ◽  
Theano Iliopoulou ◽  
Demetris Koutsoyiannis
Keyword(s):  
Land Cover ◽  
Land Cover Change ◽  
Urban Areas ◽  
Temperature Increase ◽  
Temperature Variability ◽  
Land Cover Changes ◽  
The Earth ◽  
Different Types ◽  
General Dynamics ◽  
Global Datasets

<p>Changes in the land cover occur all the time at the surface of the Earth both naturally and anthropogenically. In the last decades, certain types of land cover change, including urbanization, have been correlated to local temperature increase, but the general dynamics of this relationship are still not well understood. This work examines whether land cover is a parameter affecting temperature increase by employing global datasets of land cover change, i.e. the Historical Land-Cover Change Global Dataset, and daily temperature from the NOAA database. We thoroughly investigate the temperature variability and its possible correlation to the different types of land-cover changes. A comparison is specifically made between the rate of temperature increase measured in urban areas, and the same rate measured in nearby non-urban areas.</p>

Land Cover Change Simulations in Yangon Under Several Scenarios of Flood and Earthquake Vulnerabilities with Master Plan

2018 ◽  
Vol 13 (1) ◽  
pp. 50-61 ◽  
Author(s):  
Tanakorn Sritarapipat ◽  
◽  
Wataru Takeuchi
Keyword(s):  
High Risk ◽  
Land Cover ◽  
Land Cover Change ◽  
Urban Areas ◽  
Urban Expansion ◽  
Land Cover Changes ◽  
Master Plan ◽  
Economic Area ◽  
Urban Planning And Management ◽  
Multiple Scenarios

Yangon is the largest city and major economic area in Myanmar. However, it is considered to have a high risk of floods and earthquakes. In order to mitigate future flood and earthquake damage in Yangon, land cover change simulations considering flood and earthquake vulnerabilities are needed to support urban planning and management. This paper proposes land cover change simulations in Yangon from 2020 to 2040 under various scenarios of flood and earthquake vulnerabilities with a master plan. In our methodology, we used a dynamic statistical model to predict urban expansion in Yangon from 2020 to 2040. We employed a master plan as the future dataset to enhance the prediction of urban expansion. We applied flood and earthquake vulnerabilities based on multi-criteria analysis as the areas vulnerable to disaster. We simulated land cover changes from 2020 to 2040 considering the vulnerable areas with a master plan for multiple scenarios. The experiments indicated that by using a master plan, some of the predicted urban areas are still located in areas highly vulnerable to floods and earthquakes. By integrating the prediction of urban expansion with flood and earthquake vulnerabilities, the predicted urban areas can effectively avoid areas highly vulnerable to floods and earthquakes.

scholarly journals Long-term effects of land use/land cover change on surface runoff in urban areas of Beijing, China

2013 ◽  
Vol 8 (1) ◽  
pp. 084596 ◽  
Author(s):  
Zhongchang Sun ◽  
Xinwu Li ◽  
Wenxue Fu ◽  
Yingkui Li ◽  
Dongsheng Tang
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Cover Change ◽  
Surface Runoff ◽  
Urban Areas ◽  
Land Use Land Cover ◽  
Long Term Effects ◽  
Effects Of Land Use ◽  
Beijing China

Cd, Cr and Ni in drainage water from agricultural soils. Case study of South Alicante.

2020 ◽  
Author(s):  
José Navarro-Pedreño ◽  
María Belén Almendro-Candel ◽  
Ignacio Meléndez-Pastor ◽  
Ignacio Gómez-Lucas ◽  
Manuel M. Jordán ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Land Cover ◽  
Metal Pollution ◽  
Urban Areas ◽  
Agricultural Soils ◽  
Drainage System ◽  
Geographical Information ◽  
Land Cover Changes ◽  
Standard Methods ◽  
Drainage Channels

<p>Mediterranean coastal areas have been cultivated for long time. Wetlands areas situated near to the coast have been drainaged by using drainage channels. Heavy metals can be transferred from soils to the channels under agricultural management practices, especially under flood and furrow irrigation (the most important in the area studied). Anthropogenic inputs, including excessive use of agrochemicals and manure, in agricultural soils contribute to an increase of the content of some toxic heavy metals [1].</p><p>The agricultural area situated in the South of the province of Alicante has an important drainage system (avoiding to be a coastal wetland), which more than a thousand kilometers that allow the cultivation on calcareous soils (mainly Fluvisols). However, land uses have been changing and an important transformation of rural areas to residential areas have been occurred in the recent decades.</p><p>Under this situation, the presence of Cd, Cr and Ni in drainaged waters derived from infiltration from agricultural soils, and runoff from some urban areas, have been checked in the main drainage system (13 drainage channels) in order to detect possible influences of soil management in metal pollution. Water samples were taking along the channels in three to ten points of each channel, depending on the length, and metals were analyzed following standard methods [2]. At the same time, the land cover has been analyzed by using the last data from National Aerial Orthophotography Plan (available from the National Center of Geographical Information, Spain).</p><p>The most important result obtained was that the presence of Cd in the waters was under the limit of detection of 0.1 μg/L. This result reflected the absence of pollution sources of this metal from soils to these drainage channels.</p><p>Moreover, in the case of Cr, the values obtained were even below the reference values ​​for drinking water [3]. However, the major concentrations of this metal were between 6 to μg/L in only 4 channels. Ni, whose concentrations were lower than those for Cr, has values under 7 μg/L. Heavy metal pollution, at least in the elements analyzed, does not seem to be a serious problem in terms of the quality of these waters.</p><p>Although many land cover changes have occurred, most of the soils are dedicated to agriculture. On the other hand, no clear effects related to the proximity of urban areas to the drainage channels have been observed.</p><p><strong> </strong></p><p><strong>Keywords</strong></p><p>Heavy metals; irrigation; land cover changes, pollution, wetlands.</p><p> </p><p><strong>References</strong></p><p>[1] Navarro-Pedreño, J.; Almendro-Candel, M.B.; Gómez, I.; Jordan, MM; Bech, J.; Zorpas, A.A. (2018). Trace metal content and availability of essential metals in agricultural soils of Alicante (Spain). Sustainability 10, 4534.</p><p> [2] APHA, AWWA, WEF (2012). Standard Methods for the examination of water and wastewater. Ed. American Public Health Association, Washington.</p><p>[3] Real Decreto 314/2016, de 29 de julio, por el que se modifican el Real Decreto 140/2003, de 7 de febrero, por el que se establecen los criterios sanitarios de la calidad del agua de consumo humano.</p>

scholarly journals An Assessment of Land Use and Land Cover Changes and Its Impact on the Surface Water Quality of the Crocodile River Catchment, South Africa

2021 ◽  
Author(s):  
Nde Samuel Che ◽  
Sammy Bett ◽  
Enyioma Chimaijem Okpara ◽  
Peter Oluwadamilare Olagbaju ◽  
Omolola Esther Fayemi ◽  
...  
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Surface Water ◽  
Land Cover ◽  
Land Cover Change ◽  
Physicochemical Parameters ◽  
Anthropogenic Activities ◽  
Water Bodies ◽  
Land Cover Changes ◽  
River Catchment

The degradation of surface water by anthropogenic activities is a global phenomenon. Surface water in the upper Crocodile River has been deteriorating over the past few decades by increased anthropogenic land use and land cover changes as areas of non-point sources of contamination. This study aimed to assess the spatial variation of physicochemical parameters and potentially toxic elements (PTEs) contamination in the Crocodile River influenced by land use and land cover change. 12 surface water samplings were collected every quarter from April 2017 to July 2018 and were analyzed by inductive coupled plasma spectrometry-mass spectrometry (ICP-MS). Landsat and Spot images for the period of 1999–2009 - 2018 were used for land use and land cover change detection for the upper Crocodile River catchment. Supervised approach with maximum likelihood classifier was used for the classification and generation of LULC maps for the selected periods. The results of the surface water concentrations of PTEs in the river are presented in order of abundance from Mn in October 2017 (0.34 mg/L), followed by Cu in July 2017 (0,21 mg/L), Fe in April 2017 (0,07 mg/L), Al in July 2017 (0.07 mg/L), while Zn in April 2017, October 2017 and April 2018 (0.05 mg/L). The concentrations of PTEs from water analysis reveal that Al, (0.04 mg/L), Mn (0.19 mg/L) and Fe (0.14 mg/L) exceeded the stipulated permissible threshold limit of DWAF (< 0.005 mg/L, 0.18 mg/L and 0.1 mg/L) respectively for aquatic environments. The values for Mn (0.19 mg/L) exceeded the permissible threshold limit of the US-EPA of 0.05 compromising the water quality trait expected to be good. Seasonal analysis of the PTEs concentrations in the river was significant (p > 0.05) between the wet season and the dry season. The spatial distribution of physicochemical parameters and PTEs were strongly correlated (p > 0.05) being influenced by different land use type along the river. Analysis of change detection suggests that; grassland, cropland and water bodies exhibited an increase of 26 612, 17 578 and 1 411 ha respectively, with land cover change of 23.42%, 15.05% and 1.18% respectively spanning from 1999 to 2018. Bare land and built-up declined from 1999 to 2018, with a net change of - 42 938 and − 2 663 ha respectively witnessing a land cover change of −36.81% and − 2.29% respectively from 1999 to 2018. In terms of the area under each land use and land cover change category observed within the chosen period, most significant annual change was observed in cropland (2.2%) between 1999 to 2009. Water bodies also increased by 0.1% between 1999 to 2009 and 2009 to 2018 respectively. Built-up and grassland witness an annual change rate in land use and land cover change category only between 2009 to 2018 of 0.1% and 2.7% respectively. This underscores a massive transformation driven by anthropogenic activities given rise to environmental issues in the Crocodile River catchment.

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