Study on chaotic analysis and prediction of daily sediment concentration;

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.

Hilbert Huang transform have been performed on the monthly suspended sediment concentrations (SSCs) and loads measured at Datong Hydrological Station in Yangtze River in recent 50 a.

Based on meteorologic data, historical sediment data and current & sediment data collected in October 2006 in the Yangtze River Basin, the analyses of monthly mean water and sediment discharge characteristics, meteorologic characteristics and the effect on suspended sediment concentration and suspended sediment grain diameter under the exceptionally low water discharge were carried out.

The surveyed suspended sediment concentration data were fitted to the relative depth.

Compared with 2002,runoff coefficient and sediment content of ecological forest obviously declined and sediment decreasing rate was remarkable.