With carrying out the urgent starting project of Inner Mongolia sand source management around Beijing and Tianjing, based on investigating and analyzing the present situation of sand source and its management in Hunshandake sandy land,the existent problems and dominance in sand source management have been summarized.

Sandstorm occurring in north Shaanxi was not only influenced by strong wind,thermal instability and sand source,but also by the drought degree of previous period,an important factor to sandstorm occurring.

Dunes formation and distribution is the result of coupling of sand source,wind force and suitable place.

Characteristics and impact factors of sediment concentration in lower reaches of three great rivers of Hainan province in the recent 40 years;

Influence of variations in suspended sediment concentration and grain size on sediment deposition of Yichang-Hankou reach of Yangtze River;

Relationship between quartz component and sediment concentration and calculation on the year occurrence number of wearing sediment concentration in Shantou Bay;

To solve them,ways to calculate section average silt content through the result from ADCP device are studied.

After three centrifugal pump impeller being tested within the silt laden flow with sand content of 0 to 88 kg/m3, the variation pattern of hydraulic characteristics chart are alalyzed, the relstionship of the head, efficiency and discharge is discussed the effect of silt content on energy characteristics of centrifugal pumps is alalyzed.

5 L/min:with the smaller gradient and discharge,the erosion processes are characteristic of undulation,randomicity and intermittence,and the fluctuation amplitude of the silt content is very large;with t.