The desertification of the Shiquanhe wide valley occurs on the background of environmental degradation of the Qinghai─Xizang plateau and is strengthened with manmade irrational use of natural resources.

Numerical modeling of groundwater in a spring catchment and prediction of variations in the spring discharge;

Takeing Shuanggou Spring Area in Daliuta Coal Field as example,spring flow rate has been predicted by using this model under both natural and dewatering conditions.

To clarify scvcral conccptions about groundwater discharge,the authors advanced a brand new opinion on the formation mccliansm of: pearl springs,rising waters”,cold geysers,boiling geysers and the classification of springs and patterns of groundwater discharge.

The effect of policy on stock market is great, especially around apex and vale, because it may change the direction of the original price so as to produce great fluctuation in price.