赣江南昌河段设计水位分析

Design water level of Nanchang reach,Ganjiang river

南昌河段位于赣江(南昌—湖口)航段上游。近期受人为因素影响,河段河床、水流特性发生较大改变,致使设计水位发生一定变化。为合理确定设计水位,根据近期河床演变情况及外洲站水位流量情况,采用综合历时法、频率保证率法、水位流量关系法进行了对比分析。结果表明:设计最高通航水位近期变化不大,宜采用频率保证率法确定;设计最低通航水位逐年下切明显,宜采用水位流量法确定。

Nanchang Recently, affected by human characteristics have changed river is located on the upstream of the Ganjiang river segment （ Nanchang to Hukou）. factors, in great changes of river bed, water flow characteristics, the river bed and flow a lot, thus the design water level shall be changed accordingly. For the reasonable design water level, according to the situation of recent riverbed evolution and flow conditions of Waizhou station, we carry out a comparative analysis with synthetic duration method, frequency-duration method, as well as stage- discharge relation. The result shows that the design highest navigable level changes a little recently and thus shall be determined with the frequency-duration method, the design lowest navigable level has been lowering obviously and shall be determined with the stage-discharge method.