Abstract:

Fluvial geomorphology is widely distributed in the middle region of the Yarlung Zangbo River， meanly， these regions has experienced the most serious aeolian disaster. River inland and flood plain can provide sand for aeolian disaster. However， the relationships between river inland and flood plain area and aeolian disaster almost not be studied in these regions. For this reason， the remote sensing images and weather station data were used to analyze the area of the riverbed， flood plain and river inland， and the aeolian activities. The results indicated that there are obvious spatial and temporal differences for the area of the riverbed， flood plain， river inland， and the sediment supplement. The area of river inland and flood plain is controlled by monthly river runoff， and the monthly river runoff ranges from 0.93×10⁹ to 8.35×10⁹ m³， which is related to monthly rainfall. The area of river inland is maxinmum in March and minimum in August， with the value of 222.95 km²， 80.61 km² respectively. Sediment supplement index is maximum in the March （2.00） and minimum in the August （0.28）， means that river inland area is largest in March and smallest in August. Similarly， flood plain area is largest in March （78.99 km²） and smallest in August （45.45 km²）. Sand activities are serious in March and less in August. All results explains that river inland and flood plain can provide sediment for aeolian disaster formation and development.

Key words: Yarlung Zangbo River, river inland, flood plain, sand supplemental