Impact of DEM Resolution and Spatial Scale: Analysis of Influence Factors and Parameters on Physically Based Distributed Model

Table 5

Comparison results under different DEM resolutions and channel thresholds.

Flood time	Relative error of peak discharge				NSE coefficient
	250 m	500 m	1,000 m35	1,000 m7.5	250 m	500 m	1,000 m35	1,000 m7.5
1962081406	−12.5	−13.0	−13.1	−14.0	0.48	0.45	0.48	0.46
1963052208	11.0	11.1	10.8	10.5	0.71	0.72	0.75	0.74
1964072300	9.9	11.0	11.2	10.5	0.95	0.92	0.93	0.94
1964100208	5.5	4.9	6.6	6.5	0.85	0.82	0.83	0.83
1965070904	7.5	7.8	8.1	8.2	0.88	0.89	0.84	0.85
1966072200	−10.8	−10.5	−11.8	−12.0	0.72	0.75	0.70	0.70
1967071108	−8.2	−8.5	−9.0	−9.1	0.75	0.76	0.70	0.71
1975080508	10.1	11.2	11.5	11.5	0.80	0.75	0.78	0.77
1975091901	14.3	15.0	14.6	15.5	0.59	0.60	0.59	0.58
1977070900	−17.2	−18.0	−18.8	−19.1	0.47	0.45	0.45	0.46
1980063000	5.6	5.5	5.4	5.8	0.81	0.80	0.76	0.75
1982073102	−8.1	−9.1	−7.9	−7.8	0.89	0.88	0.86	0.85
1983100308	−5.1	−5.2	−5.8	−6.0	0.72	0.73	0.74	0.74
1984090817	−8.5	−8.8	−8.7	−9.0	0.87	0.86	0.85	0.86
1994070220	7.2	6.5	6.6	6.8	0.85	0.83	0.86	0.85
1995081114	3.1	3.8	3.2	3.5	0.88	0.88	0.86	0.85
1996080208	−2.1	−2.0	−2.2	−2.2	0.75	0.75	0.76	0.75
1998081312	−7.7	−7.5	−7.6	−7.8	0.86	0.86	0.83	0.84
Average	−0.33	−0.32	−0.38	−0.46	0.77	0.76	0.75	0.75