雅鲁藏布江中游不同地表输沙量特征

雅鲁藏布江河流宽谷区是青藏高原风沙活动最为强烈地区之一.输沙量是评价区域风沙活动的最主要指标之一,但目前对该地区输沙量的研究几乎是空白.利用旋转多路方口集沙仪对雅鲁藏布江流域中游河岸沙地、河漫滩沙地和山麓沙地3种地表类型、6个点2020年9-12月的输沙量进行野外实地观测,对比不同下垫面的输沙量,分析地表特征对输沙量的...

Study on the sand transport quantities on the different landscapes in the middle area of Yarlung Zangbo River

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.