Uncertainty of Flood Forecasting Based on Radar Rainfall Data Assimilation

Table 2

Comparison of calibration results among different methods. UC is uncalibrated, KLM is Kalman filter, AVG is average calibration, OPT is optimum interpolation, VAR is variational calibration, and SWI is statistical weight integration.

Method	Statistic	Storm event start date (yymmdd)								Average
		050408	050429	050609	060411	060508	060627	060705	060726
UC	AE (mm)	27.35	21.38	5.79	3.97	5.73	7.52	3.58	6.72	10.26
	RE (%)	70.02	44.89	23.06	13.49	14.13	26.93	11.78	37.02	30.17
	Results (mm)	11.71	26.25	19.32	33.39	34.8	20.42	26.79	24.88	24.70
KLM	AE (mm)	4.81	4.61	1.45	1.38	1.58	1.9	1.29	1.06	2.26
	RE (%)	12.32	9.68	5.76	4.69	3.89	6.79	4.26	5.84	6.65
	Results (mm)	34.25	52.24	23.67	28.04	38.95	26.05	29.08	17.1	31.17
AVG	AE (mm)	4.22	5.22	1.2	2	3.14	5.2	1.17	2.03	3.02
	RE (%)	10.81	10.96	4.8	6.8	7.75	18.59	3.86	11.17	9.34
	Results (mm)	34.83	52.85	23.91	31.42	37.38	22.75	29.2	16.13	31.06
OPT	AE (mm)	4.11	4.27	1.32	0.36	0.79	1.47	1.16	0.1	1.70
	RE (%)	10.52	8.96	5.25	1.24	1.94	5.27	3.81	0.57	4.70
	Results (mm)	34.95	51.9	23.79	29.06	39.74	26.47	29.21	18.05	31.65
VAR	AE (mm)	4.11	4.26	1.32	0.05	0.32	1.47	1.05	0.16	1.59
	RE (%)	10.53	8.94	5.27	0.18	0.78	5.27	3.47	0.88	4.42
	Results (mm)	34.95	51.89	23.79	29.37	40.21	26.47	29.31	18	31.75
SWI	AE (mm)	4.11	2.95	1.32	0.05	0.26	1.47	1.05	0.05	1.41
	RE (%)	10.53	6.18	5.27	0.18	0.65	5.26	3.47	0.29	3.98
	Results (mm)	34.95	50.58	23.79	29.37	40.26	26.47	29.32	18.1	31.61
Measured (mm)		39.06	47.63	25.11	29.42	40.53	27.94	30.37	18.16	32.28