scholarly journals Seasonal Variations of Arsenic in the Ganges and Brahmaputra River, Bangladesh

2011 ◽  
Vol 4 (1) ◽  
pp. 65 ◽  
Author(s):  
S. M. N. Islam ◽  
S. H. Rahman ◽  
D. A. Chowdhury ◽  
M. M. Rahman ◽  
S. M. Tareq
Keyword(s):  
Seasonal Variations ◽  
Agricultural Land ◽  
Monsoon Season ◽  
Water Discharge ◽  
Shallow Groundwater ◽  
Upstream Region ◽  
Land Use Patterns ◽  
Use Patterns ◽  
The Ganges ◽  
High Arsenic

Dissolved arsenic concentrations in the Ganges, Brahmaputra Rivers and confluence of these two rivers show important seasonal variations and maximum arsenic concentrations are observed during the monsoon season (July–October). These seasonal variations of dissolved arsenic concentrations were closely related to intense river-water discharge during the monsoon season with high arsenic-rich suspended particulate matter (SPM) loads. These arsenic-rich SPM mainly are primarily originated from erosion of agricultural land in upstream region irrigated with arsenic contaminated shallow groundwater and to some extent weathering of bed rocks. Considerable amount of iron and manganese enriched SPM adsorbs arsenic and increased water temperature in the summer accelerates microbially-mediated reduction of arsenic (V) to more soluble arsenic (III). Additionally, dissolution of solid arsenic-bearing mineral phases also attributes to high arsenic concentrations in water and causes seasonal variations. It is realized that the SPM of these two major rivers primarily controls the arsenic inputs into the Ganges-Brahmaputra-Meghna delta system. The cycling of arsenic in this delta is related to the monsoon seasonal dynamics, land use patterns and biogeochemical processes.Keywords: Arsenic; Ganges; Brahmaputra; Seasonal variation; Bangladesh.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7820J. Sci. Res. 4 (1), 65-75 (2012)

scholarly journals Impacts of Urbanization on Land Use Pattern and Environment: A Case Study of Ajmer City, Rajasthan

2019 ◽  
Vol 8 (1) ◽  
pp. 87-91
Author(s):  
Bhanu Priya Chouhan ◽  
Monika Kannan
Keyword(s):  
Land Use ◽  
Urban Growth ◽  
Land Degradation ◽  
Satellite Images ◽  
Agricultural Land ◽  
Population Pressure ◽  
Geographical Information ◽  
Land Use Patterns ◽  
Use Patterns ◽  
The Impact

The world is undergoing the largest wave of urban growth in history. More than half of the world’s population now lives in towns and cities, and by 2030 this number will swell to about 5 billion. ‘Urbanization has the potential to usher in a new era of wellbeing, resource efficiency and economic growth. But due to increased population the pressure of demand also increases in urban areas’ (Drakakis-Smith, David, 1996). The loss of agricultural land to other land uses occasioned by urban growth is an issue of growing concern worldwide, particularly in the developing countries like India. This paper is an attempt to assess the impact of urbanization on land use and land cover patterns in Ajmer city. Recent trends indicate that the rural urban migration and religious significance of the place attracting thousands of tourists every year, have immensely contributed in the increasing population of city and is causing change in land use patterns. This accelerating urban sprawl has led to shrinking of the agricultural land and land holdings. Due to increased rate of urbanization, the agricultural areas have been transformed into residential and industrial areas (Retnaraj D,1994). There are several key factors which cause increase in population here such as Smart City Projects, potential for employment, higher education, more comfortable and quality housing, better health facilities, high living standard etc. Population pressure not only directly increases the demand for food, but also indirectly reduces its supply through building development, environmental degradation and marginalization of food production (Aldington T, 1997). Also, there are several issues which are associated with continuous increase in population i.e. land degradation, pollution, poverty, slums, unaffordable housing etc. Pollution, formulation of slums, transportation congestion, environmental hazards, land degradation and crime are some of the major impacts of urbanization on Ajmer city. This study involves mapping of land use patterns by analyzing data and satellite imagery taken at different time periods. The satellite images of year 2000 and 2017 are used. The change detection techniques are used with the help of Geographical Information System software like ERDAS and ArcGIS. The supervised classification of all the three satellite images is done by ERDAS software to demarcate and analyze land use change.

Farming on the Fringe: Diachronic Changes in Land-Use Patterns and Agricultural Strategies in Ancient Nemea

2021 ◽  
Vol 6 ◽  
pp. 1-24
Author(s):  
Christian F. Cloke 
Keyword(s):  
Land Use ◽  
Settlement Patterns ◽  
Agricultural Land ◽  
Land Use Patterns ◽  
Record Keeping ◽  
Use Patterns ◽  
Units Of Analysis ◽  
History Of ◽  
Rural Sites ◽  
Intensive Approach

Between 1984 and 1990, the Nemea Valley Archaeological Project (hereafter NVAP), systematically surveyed the Nemea, Asopos, and Longopotamos Valleys, around Nemea, Phlious, and Kleonai in the northeastern Peloponnesos (Figure 1).1 This survey, covering an area of roughly 80 square kilometers, was for its time cutting-edge, both in its intensive approach to surveying the totality of the walkable landscape, and its use of computers for recording and mapping finds.2 The fieldwalking and record-keeping methods employed, which treated individual artifacts as the basic units of analysis, have produced a robust dataset for evaluating settlement patterns, agricultural land-use, and other past human activities within their ecological, economic, social, and historical contexts. This chapter examines the NVAP survey territory and considers the contributions of intensive pedestrian survey to the crafting of a medium- to long-term history of the Greek countryside from the Archaic to Late Roman periods. Through detailed analyses of survey finds’ physical properties and spatial distribution, I assess past settlement patterns and agricultural methods, consider the dynamics of regional production and consumption of ceramics and other goods, and elucidate a range of activities carried out at rural sites.

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