塔里木河干流克勒力克至英巴扎段河道演变特征OA

To explore the evolution characteristics of erosion and deposition in the main stream of the Tarim Riv-er from Kelelik to Yingbazha,this study analyzes typical river channel parameters,including section width,thal-weg length,curvature index,and shoreline length,based on Landsat satellite imagery and hydrological station wa-ter and sediment data during the flood periods from 1993 to 2024.In the past 32 years,the bending coefficient of the river channel has increased from 2.20 to 2.56,the average annual growth of the thalweg length is 0.27 km,and the meandering trend of the river channel has intensified.The maximum widening range of the upstream sec-tion of the river section exceeds 585%,whereas the middle and lower reaches are relatively stable.The thalweg shifts northward,with an average annual migration rate of 0.1 km·a-1,and the local bending causes the maximum swing amplitude of the main trough to exceed 3 km.Over the 32 years,the main stream of the Tarim River experi-enced five cycles of bending and straightening,which led to the adjustment of the main channel and the deviation of the flow direction,resulting in the abandonment of the five water inlets.The average annual growth rate of the left bank shoreline length is 0.149 km·a-1,which is three times that of the right bank,and the main channel contin-ues to shift to the left bank.River meandering and erosion may threaten the irrigation guarantee rate and flood control safety of coastal farmland and ecological forests.The results of this study can serve as a basis for the plan-ning and design of river flood control and regulation projects from Kelelik to Yingbazha.