Abstract:

Yarlung Zangbo River is one of the most serious aeolian disaster regions in the Tibet Plateau. Sand transport is often used to assess aeolian activities， however， there are almost no detailed field sand transport measurements in the Yarlung Zangbo River. For this reason， multi-rotation sand samplers were set up on the shifting sand surface， river floodplain and dune field in the mountains in the Yarlung Zangbo River. Sand transport quantities were measured in the six sites during September to December， 2020. The results indicated that sand transport flux has obvious spatial and temporal difference， but can be expressed as exponential functions. For the less wind velocity difference of six sites during experiments， we can derived that sand sources and landscape characteristics all affect the sand transport quantity. Changguo has rich sand sources and caused largest sand transport quantity， Senburi has little sand sources and land covered by vegetation， sand transport quantity is smallest， which means that sand activities are strongest in the river bank. The cumulative sand transport quantities below 1 m height are different for six sites during measurements. Senburi and Sangri have similar characteristics； Changguo， Aza and Duopozhang have similar characteristics， which further indicated that sand transport related sand sources and landscape characteristics. Based on the sand transport flux， total sand transport quantity and cumulative sand transport curves， sand disaster prevention system need to be built in the river bank and river flood plain.

Key words: Yarlung Zangbo River, aeolian activitis, sand samplers, sand transport