scholarly journals Changes in wetlands in Dhaka City: Trends and physico-environmental consequences

1970 ◽  
Vol 5 ◽  
pp. 37-42 ◽  
Author(s):  
Md Shahidul Islam ◽  
Md Rejaur Rahman ◽  
AKM Shahabuddin ◽  
Raquib Ahmed
Keyword(s):  
Drainage System ◽  
Water Bodies ◽  
Dhaka City ◽  
Land Use Pattern ◽  
Environmental Consequences ◽  
Water Logging ◽  
Erdas Imagine ◽  
Arc Gis ◽  
Changing Trend ◽  
The City

There existed a large number of water bodies including rivers, Khals, lakes and low-lying areas in Dhaka, a thickly populated City and capital of the country. The water bodies played important roles on the natural environment of the City including its drainage system. Due to various natural and human induced reasons, the wetlands of the City have been shrinking with the passage of time. This study makes an attempt to identify the urban wetlands, emphasizing on the extent of their changes and subsequent impacts on physical environment of the area. For ascertaining the land-use pattern of the City, this study uses topographical map (Toposheet of 1960) and satellite images (Landsat TM, 1988 and ALOS VNIR, 2008). It also uses remote sensing and GIS based software (e.g. Arc GIS, Erdas Imagine) for this purpose. Statistical analysis has been carried out in order to process and analyze the data. The study observes that the wetlands of Dhaka city are changing very quickly. In 1960, the total area of water bodies and lowlands were 2952.02 and 13527.58 ha, respectively. Whereas in 1988, the total area of the same decreased to 2103.62 and 12717.73 ha, respectively. This deteriorated further, occupying an area of 1990.71 ha in 2008 which indicates that the lowlands continued to decrease. Thus the water bodies and lowlands decreased by 32.57% and 52.58%, respectively during 1960 and 2008. This changing trend of wetlands makes the drainage system of Dhaka City vulnerable, creating water logging problems and their consequences. Land filling and encroachment were recognized to be the main reasons for changing wetlands in the City. Key words: Wetlands; wetland changes; water logging; environment DOI: 10.3329/jles.v5i0.7348 J. Life Earth Sci., Vol. 5: 37-42, 2010

scholarly journals Dhaka Water-logging: Causes, Effects and Remedial Policy Options

2021 ◽  
Author(s):  
Hossain Ahmed Taufiq
Keyword(s):  
Social Economic ◽  
Contextual Analysis ◽  
Storm Water ◽  
Dhaka City ◽  
Policy Options ◽  
Remedial Measures ◽  
Water Drainage ◽  
Environmental Consequences ◽  
Water Logging ◽  
The City

Abstract Water-logging is a major challenge for Dhaka city, the capital of Bangladesh. The rapid, unregulated, and unplanned urbanization, as well as detrimental social, economic, infrastructural, and environmental consequences, not to mention diseases like dengue, challenge the several crash programs combating water-logging in the city. This study provides a brief contextual analysis of the Dhaka’s geomorphology and natural plain, as well as, storm water drainage systems, before concentrating on the man-made causes and effects of water-logging, ultimately exploring a few remedial measures.

Sustainability Challenges for Sprawling Dhaka

2021 ◽  
pp. 097542532199799
Author(s):  
Shilpi Roy ◽  
Tanjil Sowgat ◽  
S. M. Tafsirul Islam ◽  
Nafisa Anjum
Keyword(s):  
Poverty Reduction ◽  
Drainage System ◽  
Peripheral Region ◽  
Dhaka City ◽  
Development Control ◽  
National Economic ◽  
New Business ◽  
Increasing Demand ◽  
Sustainability Challenges ◽  
The City

Dhaka’s sprawled area is likely to supersede the total land area of the Dhaka city in the near future. This article combines quantitative and qualitative methods to investigate sustainability concerns that have arisen because of irregular and rapid sprawling in Dhaka. Land cover change detection reveals that since 1991, the city outskirts have seen an addition of 234 square kilometres of built-up area. Spatial metrics show the dynamic process of infill and the fragmented transformation of land covers in Dhaka, which have led to low-density, leapfrog and ribbon sprawling. The city outskirts, especially the economically advantaged regions, have been observing rapid urban densification of neighbourhoods. Field observation and interviews in 19 sprawled areas confirm that the change has been influenced by industrialization, increasing demand for housing, high cost of living in Dhaka city, growing population and lack of development control regulations. The advantage of the sprawling process is that it offers economic opportunities, contributing to poverty reduction and national economic growth. However, the abrupt and sporadic nature of this transformation puts the long term economic and environmental viability of new business activities and habitation into question. Congested housing, poor accessibility, inadequate drainage system and sanitation facilities in sprawled areas have resulted in poor liveability and created social inequality, thus impeding the way for a sustainable urban transformation of peri-urban Dhaka. This article calls for a greater acknowledgement of sustainability concerns in development control regulations and a more inclusive form of governance to deal with existing sustainability challenges for Dhaka city and its rapidly transforming peripheral region.

scholarly journals Effect of Urbanization on Land use Land Cover in Gombe Metropolis

2019 ◽  
Vol 1 (1) ◽  
pp. 22-29
Author(s):  
L.A. Mbaya ◽  
G. O. Abu ◽  
Yila Caiaphas Makadi ◽  
D.M. Umar
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Rock Outcrops ◽  
Policy Makers ◽  
Sparse Vegetation ◽  
Time Period ◽  
Land Cover Dynamics ◽  
Erdas Imagine ◽  
Arc Gis ◽  
The City

This study examined the integration of Remote Sensing and Geographic Information System (RS/GIS) for analyzing land use and land cover dynamics in Gombe Metropolitan, the Gombe State capital for the period 1976 to 2016. Land sat (TM) images of 1976, 1996and 2016 were used. The study employed supervised digital image classification method using Erdas Imagine 9.2 and Arc GIS 10.5 software and classified the land use into undisturbed vegetation, sparse vegetation, Settlements, Farmlands, Rock outcrops, Bare surfaces. The images were analyzed via georeferencing, image enhancement, image resampling and classification. The results obtained show an increasing settlements (from 0.36% - 4.01%) and farmlands (from 24.8% - 51.2%), over a decreasing of other LULC classes (bare surfaces, undisturbed and sparse vegetation, and rocky outcrops) for the time period of 1976 to 2016. These results could help city planners and policy makers to attain and sustain future urban development. It is therefore recommended that encouragement should be given to people to build towards the outskirts, like New mile 3 and Tumfure, etc through the provision of incentives and forces of attraction that is available at the city center in these areas to avoid the problem of overcrowdings.

scholarly journals Conservation Measures for Improving Land Use and Land Cover in Dalvoy Lake Environs of Mysore City

2021 ◽  
Vol 10 (1) ◽  
pp. 173-177
Author(s):  
Akshatha N* ◽  
Shankar B
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Remote Sensing Data ◽  
Living Condition ◽  
Water Bodies ◽  
Large Cities ◽  
Small Water ◽  
The People ◽  
Erdas Imagine ◽  
The City

In recent years of Indian urbanization, the structure of large cities is undergoing rapid land use and land cover changes in lake environs, particularly in Mysore. Mysore is one of the fastest growing tier II cities, located in southern part of Karnataka. The city comprises of several large and small water bodies viz, Karanji Lake, Dalvoy Lake, Kukkarahalli Lake and Devanoor Lake. These lakes play an important role in recharging ground water, regulates microclimate, home for flora and fauna, recreational place for each neighborhood involving in community participation, improve aesthetic of the city and finally influence living condition of the people. Due to rapid transformation of land use and landcover in Mysore has resulted in degradation of water bodies. Dalvoy Lake is one of the major Lakes in Mysore City and it is deteriorating as a result of land use change, growth of industries and urbanization pressures. The total catchment area of Dalvoy Lake is 2165 acres. According to sixth sustainable development goals (clean water and sanitation) targets to protect and restore water-related ecosystems, including wetlands, rivers, and lakes. This paper deals with land use and landcover changes and its analyzing around Dalvoy Lake and its catchment using Remote sensing data and ERDAS imagine software and propose sustainable strategies for environmental improvement and management of the lake.

scholarly journals Wetlands of Dhaka City: Its Past and Present Scenario

2014 ◽  
Vol 7 ◽  
pp. 83-90 ◽  
Author(s):  
Md Shahidul Islam ◽  
AKM Shahabuddin ◽  
M Mostafa Kamal ◽  
Raquib Ahmed
Keyword(s):  
Resource Constraints ◽  
Satellite Image ◽  
Flood Plain ◽  
Water Bodies ◽  
Dhaka City ◽  
Topographic Map ◽  
Urbanization Process ◽  
Gis And Remote Sensing ◽  
Remote Sensing Technique ◽  
The City

Landscape of Dhaka city, one of the fastest growing mega cities in the world, is undergoing continuous changes and modifications due to unplanned hasty urbanization process. As the growth of urbanization taking place at an exceptionally rapid rate the city is unable to cope with changing situation due to internal resource constraints and management limitations. Dhaka city endowed with a large number of water-bodies both big and small, which includes river, khals, lakes, flood plain low-lying areas etc. However, pre and post-urban changes of water-bodies in the city were studied using topographic map of 1960 and a satellite image of 2008 (ALOS VNIR 2008) through GIS and remote sensing technique. It is found that in 1960 total areas of water-bodies and lowland were 2952.02 and 13527.58 hectares. But in 2008 total areas of water-bodies and lowland found 1990.71 and 6414.57 hectares. Categories (water-bodies and lowlands) of wetland areas were decreased harshly. Study shows that water-bodies and lowland areas were decreased 32.57% and 52.58% that means more than 49% of the wetland areas decreased over the period 1960 to 2008. The changes of low-lying areas in the south-western corner extending towards Mirpur, Muhammadpur and Pallabi-Cantonment areas and filled for the urban development. The part of Gulshan and Dhanmondi lakes has also been reduced; and some of the channels of Motijheel areas are not identifiable at present. The growth of urban infrastructures have been taking place in unplanned way; as a result it destroyed natural drainage systems, fill-up the water-bodies, causing water-loggings during rainy season in various part of the city. This study revealed that immediate necessary steps should take by concern authority to prevent from various disasters that might be occurred due to unwise and unplanned wetland changes.DOI: http://dx.doi.org/10.3329/jles.v7i0.20126 J. Life Earth Sci., Vol. 7: 83-90, 2012

scholarly journals Chemical Incident Analysis Involving Storage of Fertilizer Product

2021 ◽  
Vol 38 (1) ◽  
Author(s):  
Rogerio De Medeiros Tocantins ◽  
Bettina Tomio Heckert ◽  
Rafael Salum de Oliveira ◽  
Hélio João Coelho ◽  
Gisele Chibinski Parabocz ◽  
...  
Keyword(s):  
Chemical Reaction ◽  
Water Bodies ◽  
Reaction Products ◽  
Future Studies ◽  
Adjacent Water ◽  
Forensic Engineering ◽  
Fertilizer Material ◽  
The City ◽  
Incident Analysis

A forensic engineering analyses of a chemical incident is presented that was classified as a self-sustaining decomposition (SSD) event, which occurred in a load of 10,000 tons of NK 21-00-21 fertilizer bulk stored inside a warehouse in the city of São Francisco do Sul in Brazil. The chemical reaction developed within the fertilizer mass and took several days to be controlled, resulting in the evacuation of thousands of residents. The water used to fight against the reaction, after having contact with the load of fertilizer material, promoted changes in adjacent water bodies, causing the death of animals (fish, crustaceans, and amphibians). The smoke from the chemical reaction products damaged the incident’s surrounding vegetation. Large SSD events are rare, with an average worldwide frequency of one every three years. Therefore, in addition to presenting a case study of this type of phenomenon, the main objective of this work is to discuss the causes that led to SSD reaction at this event, evaluate its consequences, and motivate future studies.

scholarly journals Changes in the phytoplankton diversity of two oxbow lakes in a big city: a case study of Wrocław (Poland)

2016 ◽  
Vol 43 (1) ◽  
pp. 13-26
Author(s):  
Dorota Richter ◽  
Paulina Bączek
Keyword(s):  
Taxonomic Diversity ◽  
Water Bodies ◽  
Taxonomic Structure ◽  
Oxbow Lakes ◽  
Phytoplankton Diversity ◽  
Big City ◽  
Algal Assemblages ◽  
Cyanobacteria And Algae ◽  
The City

Abstract The subject of this study is to analyse changes in the taxonomic structure and development intensity of phytoplankton and, thus, to determine the diversity of cyanobacteria and algae along with the trophy state of two oxbow lakes in the Wrocław area (south-western Poland). The analysis of samples and data from previous years showed a total of 244 cyanobacteria and algae species within these two lakes. The species composition changed significantly in both of them – there were found 90 species new to the studied flora (37% of current flora) and 74 species which were previously recorded. The diversity of cyanobacteria and algae reflects the conditions in these water bodies and each change in ecological conditions (e.g., anthropological dangers) is reflected by a change in the phytoplankton assemblage structure. Consequently, knowledge of taxonomic diversity is useful in monitoring water bodies to preserve them in good conditions. Both studied oxbow lakes belong to eutrophic ecosystems as evidenced by their phycoflora, which is rich in species characteristic of high-trophy water, and recorded water blooms. The analysis of changes in cyanobacterial and algal assemblages in these lakes was also a basis for determining their trophy and finding it to be progressively eutrophic. Regular phycological studies of Wrocław numerous water bodies are essential and, in the future, will allow us to protect them and to react quickly in case of danger to these ecosystems. It will also allow us to study eutrophication processes in the water bodies that are crucial to the city.

scholarly journals Distribution of hospitals through Baghdad province using Geographic Information System

2021 ◽  
Vol 1 (137) ◽  
pp. 73-80
Author(s):  
Zahraa Najim
Keyword(s):  
Information System ◽  
Geographic Information System ◽  
Research Study ◽  
Geographic Information ◽  
Arc Gis ◽  
The City

This research study the distribution of hospitals in the province of Baghdad Using geographic information system to focus on the shortage of hospitals in specific regions in comparison with other regions. In the distribution of hospitals in the city of Baghdad using Arc GIS program, we noticed that there is a shortage in the number of hospitals in the city of Kadhimiya, Sadr city and other areas compared to the increase in the population in these areas. There are enough hospitals in the area of Andalus square.

scholarly journals Parameters lnfluencing Planning of District Level Towns in Bangladesh

2021 ◽  
pp. 77-86
Author(s):  
K. Nizamuddin
Keyword(s):  
Present State ◽  
Human Activities ◽  
Planning Process ◽  
District Level ◽  
Town Planning ◽  
Water Bodies ◽  
Actual State ◽  
The Future ◽  
The City

Town planning is a comprehensive task involving several stages that takes the city from actual state it is in to a desired state in the future through various measures taken by the concerned planning authorities. A city may be viewed as a system or a complex whole consisting of different component parts related or interacting with one another so as to form a unity. The component parts of the systenl consists of persistent human activities that have a tendency to occur or recur at specific locations that is, the activities occur within adopted spaces which include buildings, parks, water, bodies etc. The co~l~leclionasm ong these parts are communications which enable various activities to inter;ict so that necessary patterns of huinan behaviour can occur. These communications are recurrent and spatially clustered such as roads, railn~aysp, ipelines, cables etc. Implemelltation of the plan involves control of the various components of thissystenl so that the intended state as set out by the goals of the plan would depend on the existing state of the city. Therefore a thorough knowledge of the present state of the city is the first and an ilnportant step in any planning process.

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