| Abstrakt: |
Developing countries in Asia are investing in rapid transit systems as a response to the problems of urban traffic congestion and satisfying rapidly expanding transport demand, particularly in metro. Metros are completely segregated from other routes and are usually elevated or underground. It is the segregation that is necessary for delivering a quick service, as well as the technology that enables for a large number of passengers to be transported. Dhaka, the capital of Bangladesh having 8.9 million of people, is facing poor status in public transportation system. Motorcycles, rickshaws, public buses, human hauler, private cars, CNG, minibuses, and taxis are the most common and heterogenous modes of transportation in Dhaka City. From an environmental standpoint, Dhaka's current transportation situation is extremely precarious. In order to solve the problem, promotion of Electric/Hybrid vehicles have been started. For the purpose of withstanding the increasing passengers demand, the government of People's Republic of Bangladesh commissioned a comprehensive transport plan known as the Strategic Transport Plan (STP) for Greater Dhaka City and its surrounding districts in 2008. As a part of this, Bangladesh's government has set a schedule for constructing a road network of that includes six updated metro rail lines of 128.741km under the Dhaka Mass Transit Company Limited (DMTCL) which is expected to cost Tk 21,985.07 crore. The prime focus of this paper is to represent the curtailment of GHG emission due to implementation of mass transit railway systems where vehicles miles travelled data and emission factor of different vehicles have been used to calculated the GHG emission from currently available modes and the data of CO2 emission due to electricity generation has been used in case of metro rail. The method followed are selection of study area, collection of data from primary and secondary sources and analysis. The equation used for the calculation of GHG emission from transportation facilities as well as metro rail system of Bangladesh is represented with the help of literature. Primary data are collected from site visit, field survey and questionnaire survey whereas Secondary data are collected from electronic assessment of the literature which included journals, books, reports from an international organization, and articles. It has been found that currently available modes of transport emits 71,330 tons/year of GHG for passing the passengers from Uttara to Motijheel. But when MRT Line-6 of mass transit railway system will be implemented then only 18,688 tons/year of GHG will be emitted due to electricity generation which will result into a curtailment of 52,642 tons of GHG emission yearly. So, it will result into the improvement of the air quality of Dhaka city which is surely positive contribution to cut global GHG emission. [ABSTRACT FROM AUTHOR] |
