对拟建的库木巴克引水枢纽工程在河道不同地形及洪水工况下开展实体模型试验研究。试验结果表明：建闸前后试验河段均表现为沿程冲刷，冲刷强度上段大下段小。自然条件下闸前断面冲刷呈深“V”型河槽，建闸后根据枢纽调度方式的不同，当流量小于800 m³/s时，闸前断面冲刷为“W”型河槽，断面最低点位于导流墙附近冲刷坑，较冲沙闸底板高程偏低0.91 m；当流量大于800 m³/s时，闸前断面均匀冲刷，河槽相对平整，断面最低点位于泄洪闸附近，较泄洪闸底板高程偏低1.11 m。建闸后试验河段壅水影响范围最大为3 660 m，受壅水及枢纽抬高运行水位影响，长期高水位及侵蚀作用，导致滩岸稳定性降低。

This paper carries out the model experiment for the planned Kumbak water division project under different topography and frequency flood conditions of the river channel. The result shows that before and after the construction of the project， the test river section is scoured along the river， and the scouring intensity of the upper section is more than that of the lower section. Under natural conditions， the scouring of the section in front of the sluice presents a “V” shaped channel. After the construction of the project， according to the different dispatching modes of the sluice， when the upstream flow is less than 800 m³/s， the scouring of the section in front of the sluice presents a “W” shaped channel， the lowest point of the section is located in the scour hole near the diversion wall and is 0.91 m lower than the bottom elevation of the sand-sluicing sluice. When the flow is more than 800 m³/s， the section shape in front of the sluice is relatively flat， the lowest point of the section is near the flood-discharging sluice and is 1.11 m lower than the bottom elevation of the flood-discharging sluice. The maximum backwater influence scope of the test reach is 3 660 m upstream of the gate site， affected by backwater and raising water level of the project， the long-term high water level and erosion leads to the decrease in the stability of the right bank.