Before, “montenegro canyon reservoirs will be the greatest in water shipping and rainbow-blowing desert sandWater engineeringI'm sorry. In principle, it is feasible for the canyon reservoirs of montenegro (1380 m water level) to suck in to the tengri desert (200 m low) and the maulum desert (1100-950 m low) with a crushing rainbow。
Unlike the sand hole at the bottom of the dam, which drains sediment directly from the river ahead of the dam, it removes the sand from the bottom of the reservoir through the flow hole, pushes it up under the pressure of the water level difference. How do you control the flow-cave construction and export ratio
Yellow river slurry grains are predominantly small, but the most harmful is rough sand; approximately 89 per cent of the slurry is from the middle yellow highlands, of which 74 per cent is rough。
The typical sandy slurry (with a weight of approximately 2. 65) is operating at a rate of approximately 0. 2 - 0. 5 m/s。
The yellow river is 786 km long, with peach blossoms at 96 m above sea level, down to 0. 12 per 1,000, and the main channel has an average flow rate of 0. 8 to 1. 5 m/s (includes the initial rate of discharges from the small bottom reservoir)。
The reason for the downstream formation of the upper river is the high sediment content and slow flow。
If the speed of the yellow river is doubled, the ability to lose sand is multiplied several times according to the sand-rate flow rate n(n>1)。
The relationship between current speed and runoff is found in the manning formula:
The speed of the flow of sediment-guided flow through the cavity is considered to be twice as high as the rate of the lower yellow river, which is four times higher than the rate of the drop。
It can be set at 0. 5 per thousand。
Specific approaches:
1. The western left canal of the river must consider the need to transfer water to kash, in a small difference between the water level (1380 m to 1,300 m to 1230 m) and the target area, which can be brought down to 1230 m) and which is lower than the drop and flow speed and requires a separate husk to dig a tilt hole。
At altitudes of approximately 1200-1400 metres, the area of the tengri desert is slowly declining from south-east to north-west. 1300 m north of harzhughu zhlerji (not found on satellite maps, approximately two lines of positioning), 1,200 m north of the lake purple reservoir, and less than 1,200 m below the salt tank (hotan day)。
The nearest distance from the reservoir to the desert of 1,300 metres is 116 kilometres, or 0. 69 per 1,000; the ground slope is 0. 86 per 1,000. The length of the hole can be contained at about 50 kilometres (about 1355 metres of exports) to meet a 0. 5 per 1,000 reduction in the ratio。
2. There is a wide gap between the right and the east canal。
Maususha is at an altitude of 1100-1300 metres, slightly higher in the north-west and as low as 950 metres in the south-east valley。
The current water level follows the contours, with a long path (over 1,200 km) and is not suitable to drain sand into the desert。
This can be controlled below 900 km, by 0. 27 per 1,000。
If the dam rises to 1410 metres, the canal canals are combined and the waterway is approximately 700 kilometres, down to 0. 37 per 1,000。
The silt-guided tilt hole is close to the canal waterway and the control entrance is down to about 0. 50 per 1,000。
Both mud-guided flow holes have double-curveed horns to boost flow speed。
Several water gates were set up at the entrance to the eastern canal and in the sand. When the mud is drained, the upper water-purification entrance is closed, a sand-guided hole is opened and the sand is successively controlled from the nodes down to the sand。
