PowerPoint
Hydrology of Tibet, China
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Since 1952, the first of hydrologic station of Tibet was built in Chamdo prefecture to now a perfect hydrologic station network has been gradually established.
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discharge, water level, precipitation, evaporation, sedimentation, water quality, groundwater, water temperature and ice run, etc.
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Water environment monitoring:
From 1955, hydrology agency has carried out river water chemical supervision basing on hydrological network, there are 32 water quality monitor spots, 5000km of rivers under monitor, 300,000 square kilometers drainage area under control, 11 types of monitor items and 73 parameters in Tibet.
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The real-time hydrological information processing is performed on VAX or network system.
For key flood control area, such as Lhasa, Shigatse and Lhuntse, various forecasting programs have been established to make on-line flood forecasting. At present, there are two methods of flood forecasting are often used in BHT as fellow:
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At 8 p.m of April 9th 2000,the highest peak of the Layonggabu Mount collapsed suddenly .Millions of cubic meters of landslide materials fell with quantities of energy and scared mountains on both sides of the Gully. In several minutes, the materials passed 8km with a drop of 3300 meters.
The huge accumulation body of about 300 million cubic meters blocked up Yigong Tsangpo River. Seven kilometers of the river course and road were stuffed and covered.
In the process of disaster-relief and rescue, Tibet Hydrology Bureau sent 26 persons headed by Gong Tongliang to go to the disaster areas. When they arrived, they established six survey stations and a hydro-info network centered by Tongmai. In the period of their stay, they provided many valuable analysis reports to the headquarters. At midnight of June 10th , the water smashed the embankment of Yigong Lake and the discharge of the flood reached to 124,000 cubic meters per second. And the water level of Palung Tsangpo rose for 50 meters.
Yigong disaster-relief and rescue