poster - International Conference of Agricultural Engineering

FIGURE 1. Location of the Wuliangsuhai Lake in Hetao
2 Materials and methods
2.1. Study area
The WL is the largest in the Yellow River Basin in China, located between 108°43'
and 108°57' E, and 40°36′ and 41°03′ N (0). It is about 35 to 40 km long, and 5 to 10 km
wide, with a total area of 306 km 2 . A area of 177 km 2 is covered with reed and 129 km 2
is open water (Sun et al. 2011). The WL is very important for the irrigation and drainage
system of Hetao area. The losses and discharges of wastewater from municipal and
animal production sources, as well as losses from agricultural fields located around the
lake, drain mainly into the Main Drainage Channel (90%). A net of irrigation channels
connects the Main channel and WL (Fig. 1). The WL is frozen for about five months per
year, usually from mid November to mid April. The WL capacity is about 0.33 billion m 3
and depth ranges from 0.5 to 3.0 m. Annual average air temperature is 7.3 ºC, with an
average of 3185 hours of sunshine, 224 mm of annual rainfall, 1502 mm of evaporation
per year and a 3.5 km h -1 wind speed.
volume of irrigation water(10 9 m 3 )
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
diverted for irrigation water
discharged + surface drainage water
0,0
0,08
0,07
0,06
0,05
0,04
0,03
0,02
0,01
Jan.
Apr.
volume of discharge water(10 9 m 3 )
July
Oct.
0,00
FIGURE 2. Average annual use of irrigation water in Hetao and discharge into WL.