000			04282nam a2200433 4500
005			20260817173334.0
008			160698 th eng
035			_a.b10025297
099		9	_aAIT Thesis no. WA-92-13
100	1		_aKao, Chia-loong
245	1	2	_aA comparative evaluation study of selected rainfall-runoff models for small watersheds
260			_aBangkok : _bAsian Institute of Technology, _c1992
300			_a138 leaves
490	1		_aThesis ; _vno. WA-92-13
500			_aA thesis 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, 1992
520			_aThe main objective of the study is to evaluate the relative performance of the three selected models----Regression model, NAM model and Unit Hydrograph model based on their applications on two small catchments----Lan Yang stream catchment in Taiwan (area= 824 km2) and Khlong Si Yat catchment in Thailand (area= 951 km2), An investigation to test the validity of Regression model and NAM model in simulating the annual flow, baseflow and peak flow and the validity of Unit Hydrograph model in simulating direct runoff volume and peak flow has been carried out. The models were calibrated using daily streamflow, rainfall, evaporation data (only for NAM model in Lan Yang stream catchment) and monthly evaporation data (for NAM model in Khlong Si Yat catchment). Independent data were used to assess their predictive capabilities. Some statistical criteria were used to evaluate the model performance, e.g. computed and observed mean, standard deviation, correlation coefficient, coefficient of efficiency, root mean square error and relative error of computed streamflow volume. Due to the high value of basin slope and average runoff coefficient and more representative average areal rainfall obtained in Lan Yang stream catchment, the rainfall data is the most important factor in the regression model, flatter basin slope, lower average runoff coefficient and poor drainage and slow permeability of soil characteristics caused the discharge data be the most important factor in Khlong Si Yat catchment. It is found that the performance of the regression is similar and applicable in the two catchments Due to more representative rainfall and evaporation data obtained in Lan Yang stream catchment, the predictive capability of NAM model is better than that in Khlong Si Yat catchment, but may be due to the lack of knowledge about the catchment characteristics and of simulating model parameters and inaccurate measurements of the response, the results of this model in the two catchments are not as good as the regression model. Due to smaller sample space and longer rainfall duration used in Unit Hydrograph model, the performance of the model is similar to NAM model and the predictive capability is also similar and not very good in the two catchments.
650		0	_aRunoff
650		0	_aWatershed management
700	1		_aHjorth, Peder, _eChairperson
700	1		_aOnta, Pushpa Raj, _eCo-Chairperson
700	0		_aNophadol In-na, _eExamination Committee
700	1		_aSheng, Liang, _eExamination Committee
710	2		_aThe Government of R.O.C., _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-92-13
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B17273
907			_a.b10025297 _bmnait _cs
902			_a240409
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