Improving the Distributed Hydrological Model Performance in Upper Huai River Basin: Using Streamflow Observations to Update the Basin States via the Ensemble Kalman Filter

Table 1

Soil classification and its area proportions in the upper Huai River basin.

Soil code	Source soil	Clay	Silt	Sand	Rock	USDA soil texture	Area proportion (%)
		(%)	(%)	(%)	(%)
S-1	Huanghetu	23.43	65.1	11.5	0	Silt loam	21.52
S-2	Shuidaotu	16.46	71	12.5	0	Silt loam	34.62
S-3	Huangzongrang	17.03	39.4	43.6	0	Loam	13.7
S-4	Cugutu	7.05	34	35.9	23.1	Sandy loam	7.35
S-5	Shizhitu	9.16	44.1	46.7	0	Loam	7.8
S-6	Huichaotu	12.86	51.8	35.3	0	Silt loam	4.72
S-7	Shajiangheitu	20.32	65.5	14.2	0	Silt loam	9.81