赣江尾闾南支枢纽通航水流条件数值模拟研究*

拦河枢纽的施工和运营将显著改变河道的水流条件，对通航产生潜在的影响，因此有必要对枢纽工程不同时期的通航水流条件进行研究和评价。以赣江南支枢纽工程河段为研究对象，建立南支河段二维水动力数值模型，模拟施工期和运营期的河道水动力过程，分析枢纽工程对航道通航水流条件的影响。结果表明：各时期航道内流态相对平顺，不会对通航产生不利影响，在大部分流量工况下水流条件均满足通航要求；仅在施工一期10 a一遇工况下，临时航道有部分区域流速超过赣江航道通航流速控制指标（2.00 m/s），长度约为2 000 m，流速最大值为2.54 m/s；在施工二期、运营期，河段航道内水流条件均满足通航要求。研究结果可为赣江南支枢纽通航安全和运行调度提供参考。

Numerical simulation of navigable water conditions at Nanzhi Hydro-Junction in Ganjiang River

The construction and operation of a riverine hydro-junction significantly alter the hydrodynamic conditions of the waterway，potentially affecting navigation.Therefore，it is essential to study and evaluate the navigational flow conditions during different phases of the project.This study focuses on the river segment of Nanzhi Hydro-Junction in Ganjiang River.A two-dimensional hydrodynamic numerical model of the Nanzhi river segment is established to simulate the hydrodynamic processes during both the construction and operation phases.The objective is to analyze the impact of the hydro-junction project on navigational flow conditions in the waterway.The results show that during all phases，the flow patterns within the waterway are relatively smooth and do not pose adverse effects on navigation.Under most flow conditions，the flow conditions meet the navigational requirements.However，during the first phase of construction，under a ten-year return period condition，certain areas in the temporary waterway experience flow velocities exceeding the navigational flow speed control threshold of the Ganjiang River (2.00 m/s).These areas extend for approximately 2，000 meters，with a maximum velocity of 2.54 m/s.In contrast，during the second phase of construction and the operation phase，the flow conditions within the river segment meet navigational requirements.The research findings can provide reference for the safety and operational scheduling of navigation in Nanzhi Hydro-Junction of the Ganjiang River.