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  • is established which means that sand-dust storm frequency would increase abruptly when the human-induced exceeds 30%. The time series of annual number of sand-dust storm days in the neighbouring area has been compared to the time series in the annual number
  • of strong wind days and the time series in the area of cultivated land in Yikerzhao Meng, and a multiregression equation has been established.
  • the period 1956-1997 in response to the variation in sediment load and flow inputs. Multiple regression equations have been established to assess the contributions of influencing factors to the variation in sediment deposition amount in the studied river
  • for discrimination of meandering and braided channel patterns have been established. To predict the development of channel patterns under different natural conditions, the pattern discriminator should be searched on the basis of independent or at least semi