000			04235nas|a2200421 a 4500
005			20260817162946.0
008			060130s2005 th uu|m rtt 0| a1eng d
035			_a.b11979550
099		9	_aAIT Thesis no.WM-04-18
100	0		_aLe Bao Trung
245	1	3	_aAn application of Soil and Water Analysis Tool (SWAT) for water quality of upper Cong Watershed, Vietnam
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2005
300			_a99 leaves : _bill.
490	1		_aThesis ; _vno. WM-04-18
500			_athesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 2005
520			_aUnder the rapid development of agricultural cultivation, water quality is a rising problem in many watersheds of Vietnam. Intensive agriculture has raised a public concern when huge amount of fertilizer and pesticides was used without proper management obviously making a severe impact to human health. In this study, Soil and Water analysis Tool (SWAT), a model is well designed for rural ungaged basin is used to simulate water quality problems in Cong watershed (Vietnam). Digital Elevation Model was provided by United States Geologic Survey agency with resolution of 90 m. Land cover was provided by Ministry of Agricultural and Rural Development (MARD) for 3 years 1996, 1999, 2003 classified from LANDSAT images. Digitized stream network and soil map (map scale 1:50000) were also obtained from MARD. Meteorological data was obtained from Ministry of Natural Resources and Environment (MONRE). Land operation and fertilizer information was provided by MARD and field surveys. Rain fall data (six stations with recording duration from 1961-2003) were processed by using Integrated Quantity and Quality Model (IQQM) while a back-calculation process was implemented to estimate the natural inflow to Nui Coc reservoir (at the outlet of upper Cong watershed). Baseflow filter was also used to determine the proportion of baseflow by using Baseflow program. Results from calibration and validation processes show fitted results between observed and simulated results on monthly basis, quite acceptable on daily basis for both natural period (1961 1970) and intensive agriculture period (1994 2001) as well as validation period (2002). Sediment and nitrate yield maps were extracted from the longterm simulation results (1994 2001). The highest sediment and nitrogen yield sub-basins were respectively indicated. SWAT simulation results suggested that sediment is not a severe problem with Nui Coc reservoir but nitrogen loads are the real threats. Moreover, the simulation points that high concentration of ammonia, which endangered Thai Nguyen downtown residents in relatively long period of time, occurred in Nui Coc reservoir. In brief, SWAT proved its ability in simulating the water quality problems in watershed level. It promised as a useful tool to assist water quality management process practically in Cong watershed.
650		0	_aWater quality _zVietnam
650		0	_aWater _zVietnam _xAnalysis
650		0	_aSoils _zVietnam _xAnalysis
700	1		_aBabel, Mukand Singh, _eChairperson
700	1		_aGupta, Ashim Das, _eChairperson
700	1		_aClemete, Roberto S., _eExamination committee
700	0		_aSutat Weesakul, _eExamination committee
710	2		_aHanoi Water Resources University / MARD- WaterSpS - DANIDA, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WM-04-18
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B10602
907			_a.b11979550 _bmnait _cu
902			_a240329
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