000			04390nas a2200397 a 4500
005			20260817163636.0
008			091207s2009 th uu|m rtt 0| a1eng d
035			_a.b12070750
099		9	_aAIT Thesis no.WM-08-03
100	1		_aAdhikary, Sajal Kumar
245	1	0	_aAssessment of salinity intrusion in an aquifer system in the southwest region of Bangladesh
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2009
300			_a118 leaves : _bill.
490	1		_aThesis ; _vno. WM-08-03
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2008
520			_aGroundwater resources development and management on a regional basis is an important requirement for a developing country like Bangladesh which often experiences the lack of surface water resources of adequate quality to meet the rising freshwater demand. The coastal belt surface water systems in the southwest region of the country have already been affected by saline water intrusion from the sea. Groundwater systems may be affected by salinity intrusion from the sea and affected surface water systems through dynamic interaction mechanisms. In addition, further groundwater development and sea level changes could aggravate the situation. Finding a solution to such a problem requires thorough investigation and analysis of the overall system in an integrated manner. Taking this into account, the present study is an attempt to investigate the salinity intrusion phenomena into the groundwater system in the southwest region of Bangladesh. An integrated river-aquifer modeling approach is used for analyzing the groundwater flow characteristics and dynamic interaction of the rivers and the underlying aquifers. A three»dimensional groundwater simulation model, MOD FLOW, is applied for this purpose. An area of 16,985 km2 covering almost entire southwest region of Bangladesh is considered for the present case study. Stratigraphic analysis of sub-surface lithology is done to define the aquifer system in the study area. The calibrated flow model satisfactorily simulates the flow characteristics of the regional groundwater system and dynamic interactions between rivers and aquifers. A three-dimensional numerical mass transport simulation model, MT3DMS, is applied to develop the saltwater intrusion model. The model is then applied to assess salinity intrusion, by advection process, into the groundwater systems for existing mean sea level and sea level rise condition in 2030. For both cases, the model results show that the saline front lies close to the sea boundary located far away from the study area border. The simulation results of dynamic interaction showed that salinity intrusion from surface water bodies, in the form of recharge water, is the predominant factor affecting groundwater system rather than the intrusion directly from the sea side. The study conclusively proves that in the integrated river-aquifer systems in coastal region, the interactions between the rivers and the underlying aquifer systems have significant influence on the flow and salinity intrusion into the overall system
650		0	_aWater salinization _xEvaluation _zBangladesh
700	1		_aBabel, Mukand Singh, _eChairperson
700	1		_aGupta, Ashim Das, _eExamination Committee
700	1		_aClemente, Roberto S., _eExamination Committee
700	1		_aPerret, Sylvain Roger, _eExamination Committee
710	2		_aNetherlands Ministry for Development Cooperation, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WM-08-03
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B04298
907			_a.b12070750 _bmnait _cu
902			_a240329
998			_b0 _c091207 _dm _ea _fu _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
909			_aBarcode : 30050120550453 _bCREATED : 2014-03-31 _cRECORD # : i12783328 _dLPATRON : 1028593 _eLCHKIN : 2019-01-02 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 1 _iTOT CHKOUT : 5 _jTOT RENEW : 4
909			_aBarcode : 30050120233241 _bCREATED : 2016-01-04 _cRECORD # : i12921282 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c9330 _d9330