Md.Rubayet Mortuza | Bangladesh University of Engineering & Technology (original) (raw)
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Papers by Md.Rubayet Mortuza
Heat Index describes the combined effect of temperature and humidity on human body. This combined... more Heat Index describes the combined effect of temperature and humidity on human body. This combined effect is causing a serious threat to the health of people because of the changing climate. With climate change, climate variability and thus the occurrence of heat waves is likely to increase. Evidence is emerging from the analysis of long-term climate records of an increase in the frequency and duration of extreme temperature events in all over Bangladesh particularly during summer. Summer season has prolonged while winters have become short in Bangladesh. Summers have become hotter and thus affecting the lives of the people engaged in outdoor activities during scorching sun hours. In 2003 around 62 people died due to heat wave across the country. In this paper Bangladesh is divided in four regions and heat index has been calculated from 1960 to 2010 in these regions of the country. The aim of this paper is to identify the spots most vulnerable to heat strokes and heat waves due to high heat index. The results show upward trend of heat index in almost all the regions of Bangladesh. The highest increase in heat index value has been observed in areas of South-west region and North-west Region. The highest change in average heat index has been found in Jessore by almost 5.5 0 C.
The principal objective of this paper is to assess the variability of water level and flow of the... more The principal objective of this paper is to assess the variability of water level and flow of the Old Brahmaputra River. The water level and Discharge trend of the river has been assessed based on historical data to find the variability over time. Average monthly discharge at a particular gauge station of the river has been plotted for the duration of 1975 to 2006 for each of the month to have an observed flow trend characteristics through time. The trend lines show that the river has undergone a considerable declination during the period. The wet period show large fluctuations of flow in a range of 2200 to 500 m3/s with a sharp decreasing pattern. The wet period flow of Old Brahmaputra River shows relatively lower discharge almost in every alternative year and its declination is radical compared to dry period flow. Alike discharge pattern water level also shows decreasing trend. Frequent fluctuations of water level are observed during the period from 1991-2008 when it shows more dispersive nature in the monsoon months. This declination of water level is observed to be faster during 1991-2008 than 1973-1990.
Bangladesh is one of the most disaster-prone countries in the world. High spatial and temporal cl... more Bangladesh is one of the most disaster-prone countries in the world. High spatial and temporal climatic variability, extreme weather events, poor institutional capacity, inadequate financial resources, and poor infrastructure have made Bangladesh highly vulnerable to disaster. Drought is a recurrent feature of the climate and it is common in Bangladesh. It is related to a deficiency of precipitation over an extended period of time, usually for a season or more. This deficiency results in a water shortage for some activity, group, or environmental sector. Drought affects people's access to food and water. Monsoon rains normally sweep Bangladesh from June to September gets more than 80 percent of its annual rainfall during this period. The amount of rainfall varies considerably from year to year and from region to region. In some areas in the northwestern part of the country, the amount of annual average rainfall may be as low as 130 mm whereas in the north-eastern part, average annual rainfall may be as high as 500 mm. So the northwestern part of the country is vulnerable to drought and is recognized as drought-prone region of the country. This paper deals with spatial and temporal distribution of meteorological drought in the northwestern part of Bangladesh over last 5 decades by Standardized precipitation index method. GIS is used to map the spatial extents of droughts in different time steps. The Standardized Precipitation Index (SPI) series of different time scales have been calculated and used for drought analysis.
Dhaka is the most densely populated mega city of this world. Increasing demand of increasing popu... more Dhaka is the most densely populated mega city of this world. Increasing demand of increasing population of Dhaka city puts pressure on energy consumption. As a result we are facing shortage of electricity, gas, water which is making the city unsustainable day by day. To ensure sustainable future we have to go for Green buildings. Green building focuses on energy conservation, materials (embodied energy and renewable), water (conservation and re-use). One aspect of green engineering and sustainable design is how man interacts with the hydro-logic cycle. Rainwater harvesting is the process of intercepting storm-water runoff and putting it to beneficial use. It provides self sufficiency to water supply and to supplement domestic water requirement, recharges the groundwater, reduces the runoff which chokes storm drains and avoids flooding of roads. This will reduce water logging on the roadway of Dhaka city, the demand of water on WASA and power consumption for pumping of ground water. These sorts of schemes that result in eco-friendly environment in the city are being seriously considered by our present government (2009-2013). In this context, current technological scenario of the buildings constructed in Dhaka with regard to rooftop rainwater harvesting is investigated. This paper presents the outcome of this investigation and shows the potentiality of rainwater harvesting to make the city sustainable.
Heat Index describes the combined effect of temperature and humidity on human body. This combined... more Heat Index describes the combined effect of temperature and humidity on human body. This combined effect is causing a serious threat to the health of people because of the changing climate. With climate change, climate variability and thus the occurrence of heat waves is likely to increase. Evidence is emerging from the analysis of long-term climate records of an increase in the frequency and duration of extreme temperature events in all over Bangladesh particularly during summer. Summer season has prolonged while winters have become short in Bangladesh. Summers have become hotter and thus affecting the lives of the people engaged in outdoor activities during scorching sun hours. In 2003 around 62 people died due to heat wave across the country. In this paper Bangladesh is divided in four regions and heat index has been calculated from 1960 to 2010 in these regions of the country. The aim of this paper is to identify the spots most vulnerable to heat strokes and heat waves due to high heat index. The results show upward trend of heat index in almost all the regions of Bangladesh. The highest increase in heat index value has been observed in areas of South-west region and North-west Region. The highest change in average heat index has been found in Jessore by almost 5.5 0 C.
The principal objective of this paper is to assess the variability of water level and flow of the... more The principal objective of this paper is to assess the variability of water level and flow of the Old Brahmaputra River. The water level and Discharge trend of the river has been assessed based on historical data to find the variability over time. Average monthly discharge at a particular gauge station of the river has been plotted for the duration of 1975 to 2006 for each of the month to have an observed flow trend characteristics through time. The trend lines show that the river has undergone a considerable declination during the period. The wet period show large fluctuations of flow in a range of 2200 to 500 m3/s with a sharp decreasing pattern. The wet period flow of Old Brahmaputra River shows relatively lower discharge almost in every alternative year and its declination is radical compared to dry period flow. Alike discharge pattern water level also shows decreasing trend. Frequent fluctuations of water level are observed during the period from 1991-2008 when it shows more dispersive nature in the monsoon months. This declination of water level is observed to be faster during 1991-2008 than 1973-1990.
Bangladesh is one of the most disaster-prone countries in the world. High spatial and temporal cl... more Bangladesh is one of the most disaster-prone countries in the world. High spatial and temporal climatic variability, extreme weather events, poor institutional capacity, inadequate financial resources, and poor infrastructure have made Bangladesh highly vulnerable to disaster. Drought is a recurrent feature of the climate and it is common in Bangladesh. It is related to a deficiency of precipitation over an extended period of time, usually for a season or more. This deficiency results in a water shortage for some activity, group, or environmental sector. Drought affects people's access to food and water. Monsoon rains normally sweep Bangladesh from June to September gets more than 80 percent of its annual rainfall during this period. The amount of rainfall varies considerably from year to year and from region to region. In some areas in the northwestern part of the country, the amount of annual average rainfall may be as low as 130 mm whereas in the north-eastern part, average annual rainfall may be as high as 500 mm. So the northwestern part of the country is vulnerable to drought and is recognized as drought-prone region of the country. This paper deals with spatial and temporal distribution of meteorological drought in the northwestern part of Bangladesh over last 5 decades by Standardized precipitation index method. GIS is used to map the spatial extents of droughts in different time steps. The Standardized Precipitation Index (SPI) series of different time scales have been calculated and used for drought analysis.
Dhaka is the most densely populated mega city of this world. Increasing demand of increasing popu... more Dhaka is the most densely populated mega city of this world. Increasing demand of increasing population of Dhaka city puts pressure on energy consumption. As a result we are facing shortage of electricity, gas, water which is making the city unsustainable day by day. To ensure sustainable future we have to go for Green buildings. Green building focuses on energy conservation, materials (embodied energy and renewable), water (conservation and re-use). One aspect of green engineering and sustainable design is how man interacts with the hydro-logic cycle. Rainwater harvesting is the process of intercepting storm-water runoff and putting it to beneficial use. It provides self sufficiency to water supply and to supplement domestic water requirement, recharges the groundwater, reduces the runoff which chokes storm drains and avoids flooding of roads. This will reduce water logging on the roadway of Dhaka city, the demand of water on WASA and power consumption for pumping of ground water. These sorts of schemes that result in eco-friendly environment in the city are being seriously considered by our present government (2009-2013). In this context, current technological scenario of the buildings constructed in Dhaka with regard to rooftop rainwater harvesting is investigated. This paper presents the outcome of this investigation and shows the potentiality of rainwater harvesting to make the city sustainable.