Structure of wind-sand flow and law of dune movement along bank of Yellow River in Ulan Buh desert

To understand the sand dune movement activities and characteristics in Ulan Buh desert along the Yellow River, taking the mobile dunes along the bank as study material and based on lots of work in the field observation and lab analysis, a primary quantity research was made to study the wind speed of sand raising, constituents of sand, structure of wind-sand flow and moving characteristics of dune movement. The results showed that the study area from the main sand wind WS-W, concentrated in March to May, and 5-6 m/s wind accounted for 50.26% of the wind-sand; Sand material particle size are mainly fine (0.1-0.25 mm); Along the Yellow River segment, the composition of sand dune particle below very fine size (≤ 0.1 mm) is 8.92% less than that of the desert hinterland. About 81.75% sand material of the study area pass through 0-10 cm air layer. There is a good power function relationship between the relative sediment discharge and elevation in different parts of the dunes; The dunes move forward a distance of 8.19 m/a, mainly occurred in March to May. The findings in the study can provide a scientific basis for calculating the amount of sediment in the Yellow River and improvement of comprehensive protection system along the Yellow River.