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005			20260817163006.0
008			091209s2009 th uu|m rtt 0| a1eng d
035			_a.b12070877
099		9	_aAIT Thesis no.WM-08-20
100	0		_aSupatchaya Chuanpongpanich
245	1	0	_aApplication of weather radar for rainfall forecasting in Bangkok
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2009
300			_a197 leaves : _bill.
490	1		_aThesis ; _vno. WM-08-20
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			_aWeather radar is one of equipments that can provide real time meteorological data such as rainfall covering large area including big city like Bangkok. A lot of activities in the capital of Thailand depend on the rainfall information in advance. Although, it is difficult to understand rainfall behavior exactly, forecasting can give important information on the trends. The input data from radar images influence in forecasting processes; thus, calibration of radar is necessary and it can provide rainfall intensity (R) from output of radar, reflectivity (Z) values. The objectives of present study are to: calibrate equation of Z-R in the weather radar at Suvarnabhumi, forecast rainfall and develop a procedure to forecast rainfall at a specific location. Radar images from Suvarnbhumi radar covering Bangkok area are used in this study. The Window Correlation Matching Method (WCMM) is used to determine Z-R relationship and it takes into account the wind effecting to rain measurement and the average reflectivity of different number of pixels in radar image. Thirty six rainfall events with 117 radar images and more than 4 hours of rainfall duration of each event in 2007 and 2008 are used for weather radar calibration and rainfall forecasting. Two radar range 60 kilometers and 240 kilometers are obtained from Thai Meteorological Department (TMD). Twenty raingauge stations are used for calibration. There are nine different cases of WCMM considering time and window space to find the optimal constant values from calibration. In this study, the calibration of radar from Z-R relationship is obtained with fairly satisfactory values for Z = 44.15R¹·⁰¹⁴ for 60 kilometers radar range and poorly satisfied values for Z = 76.45R⁰·²²² with 240 kilometers radar range. Critical Success Index (CSI) is found to be 65 % when translation model is developed to forecast five minute time interval of rainfall over all selected fifteen areas in Bangkok such as Siam Paragon, Sukhumvit and Silom. The present study proposed forecasting algorithm which can provide information of rainfall direction, time of rainfall start and rainfall stop. The new indicator, Critical Success Index by Time (CSIT) has been introduced to determine the accuracy of forecast at a particular location. The forecasted result shows that CSIT is about 67% on average
650		0	_aRain and rainfall _xForecasting
650		0	_aRadar meteorology
650		0	_aWeather forecasting
700	1		_aBabel, Mukand Singh, _eChairperson
700	0		_aSutat Weesakul, _eExamination committee
700	1		_aClemente, Roberto S., _eExamination Committee
700	1		_aGupta, Ashim Das, _eExamination Committee
710	2		_aRTG Fellowship, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WM-08-20
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B04313
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909			_aBarcode : 30050120690291 _bCREATED : 2014-03-31 _cRECORD # : i12783262 _dLPATRON : 1025339 _eLCHKIN : 2015-05-19 _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 1 _jTOT RENEW : 0
909			_aBarcode : 30050120233068 _bCREATED : 2016-01-04 _cRECORD # : i12921440 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
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