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The GCC method was verified using data from the Dagutai, Bailianhe and Kaifengyu watersheds, located in the middle reaches of the Han River, the largest tributary of the Yangtze River, China (Figure 4). All watersheds are within the subtropical monsoon climate zone. A digital elevation model (DEM) of each watershed was derived from shuttle radar topographic mission data, obtained from consortium for spatial information (http://srtm.csi.cgiar.org/) at a 90 m grid resolution. The Yangtze River Commission of the Ministry of Water Resources, P.R. China provided 6-hourly rainfall and instantaneous runoff data measured every 6 hours from each watershed. From these data a total of 18 representative storm events were selected for analysis (Table 1), with six events from the Dagutai watershed with four rain gauges, seven events from the Bailianhe watershed with 14 rain gauges and five events from the Kaifengyu watershed with 29 rain gauges.
Table 1

Characteristics of the storm events from the study areas selected for analysis

WatershedArea (km2)Number of rain gauge stationsStorm IDDateAverage total rainfall volume from rain gauges (mm)Maximum total rainfall volume from rain gauges (mm)Minimum total rainfall volume from rain gauges (mm)Max/MinCoefficient of spatial variationaPeak discharge (m3/s)
Dagutai 727 19740809 36.6 55.7 19.7 2.83 1.06 141 
  19780529 28.4 31.2 27.6 1.13 0.14 58 
  19780624 96.1 126.2 74.7 1.69 0.61 93 
  19800820 41.0 43.6 36.7 1.19 0.15 84 
  19820809 71.3 181 25.0 7.24 2.32 265.6 
  19830811 32.0 62.7 23.9 2.62 1.37 155 
Bailianhe 1800 19 19790626 213.4 286 145.0 1.97 0.73 2774 
  19790629 100.8 125 28.0 4.46 1.01 857 
  19810627 127.8 249.1 58.4 4.26 1.13 1936 
  10 19820614 121.2 198.3 55.1 3.60 1.22 1597 
  11 19850620 69.9 76.8 60.8 1.26 0.22 1027 
  12 19860706 74.4 142.9 85.2 1.68 0.80 1542 
  13 19870820 160.0 256.9 107.3 2.39 0.91 3336 
Kaifengyu 5253 24 14 19760531 43.8 90.9 15.8 5.75 1.76 1173 
  15 19800623 97.8 142.2 67.7 2.10 0.78 2300 
  16 19800824 47.4 90.1 38.2 2.36 0.67 1117 
  17 19800827 55.7 186 28.0 6.64 3.58 976 
  18 19800907 51.4 71.1 45.3 1.57 0.33 1,173 
WatershedArea (km2)Number of rain gauge stationsStorm IDDateAverage total rainfall volume from rain gauges (mm)Maximum total rainfall volume from rain gauges (mm)Minimum total rainfall volume from rain gauges (mm)Max/MinCoefficient of spatial variationaPeak discharge (m3/s)
Dagutai 727 19740809 36.6 55.7 19.7 2.83 1.06 141 
  19780529 28.4 31.2 27.6 1.13 0.14 58 
  19780624 96.1 126.2 74.7 1.69 0.61 93 
  19800820 41.0 43.6 36.7 1.19 0.15 84 
  19820809 71.3 181 25.0 7.24 2.32 265.6 
  19830811 32.0 62.7 23.9 2.62 1.37 155 
Bailianhe 1800 19 19790626 213.4 286 145.0 1.97 0.73 2774 
  19790629 100.8 125 28.0 4.46 1.01 857 
  19810627 127.8 249.1 58.4 4.26 1.13 1936 
  10 19820614 121.2 198.3 55.1 3.60 1.22 1597 
  11 19850620 69.9 76.8 60.8 1.26 0.22 1027 
  12 19860706 74.4 142.9 85.2 1.68 0.80 1542 
  13 19870820 160.0 256.9 107.3 2.39 0.91 3336 
Kaifengyu 5253 24 14 19760531 43.8 90.9 15.8 5.75 1.76 1173 
  15 19800623 97.8 142.2 67.7 2.10 0.78 2300 
  16 19800824 47.4 90.1 38.2 2.36 0.67 1117 
  17 19800827 55.7 186 28.0 6.64 3.58 976 
  18 19800907 51.4 71.1 45.3 1.57 0.33 1,173 

aCoefficient of spatial variation was calculated by (max-min)/average. A uniform distributed rainfall was evaluated by the values of coefficient of spatial variation close to zero and values of max/min close to one.

Figure 4

Location, elevation and river networks of the Dagutai, Bailianhe and Kaifengyu watersheds.

Figure 4

Location, elevation and river networks of the Dagutai, Bailianhe and Kaifengyu watersheds.

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