Dissertations/Theses - Department of Water Resources Engineering
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Item Optimal method for prediction of channel geometry in alluvium(Department of Water Resources Engineering, 1992-08) Ziaul Haider; Abdul Matin, Dr. Md.For abstract please see full textItem Correlation of non-dimensional parameters or water courses in alluvium(Department of Water Resources Engineering, 1988-08) Yasmin Begum; Hossain, Dr. M. MonowarFor abstract please see full textItem Study of sediment transport in the river Gorai-Modhumoti(Department of Water Resources Engineering, 1986-09) Waliuzzaman Khan; Hossain, Dr. M. MonowarFor abstract please see full textItem Study of long duration rainfall data for the north-west region of Bangladesh(Department of Water Resources Engineering, 1986-07) Tariq Ahmed; Mohib Uddin Ahmed, Dr. SyedFor abstract please see full textItem Study of aggradation and degradation of the Khowai river(Department of Water Resources Engineering, 1997-08) Tarek Bin Hossain; Hossain, Dr. M. MonowarThe study was conducted to investigate the aggradation and degradation of the Khowai River bed. Assessment of future sedimentation along the Khowai river was also carried out. The reach extends from Ballah to the confluence of Khowai- Dhaleswari River and has an overall length of 87 km. To carry out the investigations 39 sections of the Khowai River form Ballah to the Khowai-Dhaleswari confluence for the year 1988, 17 cross sections form Shaistaganj to Khowai-Dhaleswari confluence for the year 1994 and a thalweg profile for the year 1965 were collected in the digitized form from FAP-6. Data on suspended sediment concentrations at the Shaistaganj station between years 1964 and 1993 were also collected from River Research Institute (RRI), Faridpur. Mean daily water levels for the gauge stations at Ballah, Chunarughat, Shaistaganj and Habiganj form 1964 to 1994 and mean daily discharges at Shaistaganj station for the same years were collected from Surface Water Modelling Centre (SWMC). Bed material gradation curves for the year 1992 at Chunarughat gauge, Shaistaganj gauge, Habiganj gauge and downstream of Habiganj gauge were collected from FAP-6. Suspended sediment particle size distribution curves for the years 1991 and 1992 at Shaistaganj were collected from SWMC. Cross-sectional properties at 17 locations between Shaistaganj and the Khowai-Dhaleswari confluence between years 1988 and 1994 were analyzed and it was observed that the river between the reach is becoming narrower and the average thalweg level has degraded by 1.29 m between Shaistaganj and 6.6 km downstream of Habiganj. The total reach of this degraded thalweg is about 21 km in length. After that up to the confluence of Khowai and Dhaleswari River the average thalweg level has again suffered degradation by 2.03 m on an average during the study period. The cross sectional area at bankfull stage is being increased at the rate of 10.1 m2 per year since 1988. It was also observed that in most of the occasions the cross sectional area above bankfull stage has reduced indicating deposition of sediment on the berms and flood plain on both sides of the river. The overall cross section of the 23.44 km reach below Shaistaganj is being reduced at the rate of 14.84 m2 per year since 1988. It was also observed from the analysis of the water level records between years 1964 and 1994 that Khowai river bed level is being aggraded at the gauge stations at Ballah, Chunarughat, Shaistaganj and Habiganj by 0.96 m, 0.2 m, over 1 m, and 1.5 m respectively since 1964. Study of the thalweg profiles between years 1965 and 1988 suggested that the Khowai River has aggraded by 1 m between Ballah and Chaunarughat and degraded by 1 m between Chunarughat and Shaistaganj. Mean bed level profiles of 1988 and 1994 suggested average aggradation by 0.4 m between Shaistaganj and 6.6 km downstream of Habiganj. After that up to the end of the river i.e. the confluence of Khowai and Dhaleswari River it suffered degradation by 0.5 m. The mean bed level profile of 1994 showed a scour hole due to the loop cut made by BWDB in the year 1992 at 9 km downstream of Habiganj. Analysis of bed material curves and suspended sediment particle size distribution curves based on Einstein's theory suggested that the inflowing sediment load at Shaistaganj stations consisted of 30% coarser fraction of the suspended load and 70% wash load. Future prediction on the Khowai River sedimentation was made using HEC-6 based on channel geometry of 1988. The study revealed that there would be continued deposition of sediment indicating continued aggradation of the bed level along the study reach of the river.Item Evaluation of selected local scour formulae around piers and groynes(Department of Water Resources Engineering, 1998-12) Anwaruzzaman, Syed Md.; Hossain, Dr. M. MonowarFor abstract please see full textItem Performance evaluation of early inplemantation project : a case study(Department of Water Resources Engineering, 1993-06) Ismail Ali, Syed; Bari, Dr. M FazlulFor abstract please see full textItem Assessment of environmental impacts of water development projects using overlay technique(Department of Water Resources Engineering, 1998-06) Iqbal Khosru, Syed; Nishat, Dr. AinunEnvironmental Impact Assessment (EIA) has been made mandatory for all water development projects in Bangladesh, to be carried out at project planning stage. The main objective of EIA is to identify the probable effects, both beneficial and adverse, resulting from the project. Then through EIA, suggestions are given to the planners so as to minimize and mitigate the negative or adverse impacts and enhance the positive or beneficial impacts. EIA then prepares an Environmental Management Plan (EMP) for future monitoring of the project, both during and after its implementation so that sustainability is ensured. There are a number of techniques for carrying out EIA namely: Checklist, Matrices, Networks, Environmental Evaluation System, Overlay Technique, Environmental Impact Indices and Costbenefit Analysis. Besides, many institutions have developed their own guidelines for EIA. Bangladesh has adopted the Weighted Matrix method and a guidelines for carrying out EIA of water development projects has already been developed and adopted. Every method has some advantages and disadvantages in their application. As for example, Network method has been found suitable for identifying secondary and as well as tertiary impacts. Overlay technique is considered suitable for presentation of spatial variation in impacts. This study was taken up to carryout a comparative study of the various methods of EIA and evaluate whether some elements of Overlay technique can be adopted while presenting findings through Weighted Matrix method in accordance with the approved guidelines. To carry out these objectives, data available from post evaluation of the System Rehabilitation Project (SRP) were used. SRP, during 1990-95, rehabilitated 35 water development projects of the Bangladesh Water Development Board (BWDB). A multidisciplinary Evaluation Team assessed seven SRP projects, using EIA methodology. In this study, data of two projects were used. GIS based mapping technique was used to produce the Overlays. For comparison with conventional method, some important environmental components (lECs) were chosen, namely: Flood Control, Drainage, Irrigation, Crop Damage and Capture Fisheries. Other IECs, relevant to water resources development and management projects have been identified on the basis of various studies available on evaluation of completed projects. Preliminary assessment of suitability of overlay techniques and availability of data led to selection of the aforesaid five parameters. For this type of projects, modification in flooding characteristics and changes in cropping are most significant parameters. It has been found that EIA results can be better presented through Overlays for the selected IECs. Impact of probable floods, corresponding to various return periods, and matching with any river water level, on the project area, can be clearly represented by Overlay. Similarly improvement in drainage in post-monsoon condition can be better represented with spatial variations shown on the maps. Impact of the project on potentials as well as actual performance of irrigation were clearly visible in Overlay maps. Impacts on capture fisheries, studied with overlays, clearly demarked the areas of potential conflict between agriculture and fisheries. It was observed that in the projects studied, such conflict was prevalent over small areas. On the other hand flooding pattern has significantly adverse impact on agriculture. These analysis would be of great value in future water management practices. Finally it can be said that, overlay mapping can have very important role in the EIA process. The conventional method can not assess the impact and quantify the spatial variation. The method is also very flexible and the importance of the time function can be well addressed.Item Study on changes in river-section characteristics of Brahmaputra-Jamuna station(Department of Water Resources Engineering, 1989-11) Halder, Swapan Kumar; Abdul Hannan, Dr.For abstract please see full textItem Study on hydraulic geometry of the ganges(Department of Water Resources Engineering, 1992-05) Das, Swapan Kumar; Hossain, Dr. M. MonowarFor abstract please see full text