赣江南昌段东西河工程整治前后分流比变化研究

近年来，由于不合理的开发利用，赣江下游的两条支流东、西河的分流比发生了较大变化，对河道防洪、通航和城市取水等产生了影响，为此，规划采用工程措施进行河道治理。为了对工程治理效果进行验证，选用Delft3D软件建立了平面二维水流模拟数学模型，并根据实测水文资料对模型进行了验证，对赣江南昌段工程整治后水位、断面流速分布、东西河分流比进行了模拟分析。结果表明，在枯水和洪水条件下，工程整治对东西河分流比的调控作用不明显，裘家洲切滩后上游水位略有降低，下游水位未受影响，断面流速分布更为均匀，东河疏浚工程有增大其过水能力的趋势。分析结果为工程措施的改进提供了依据。

Research on diversion ratio of Nanchang reach of Ganjiang River after its regulation

Due to unreasonable development and utilization,the diversion ratio of 2 bifurcated rivers(Donghe and Xihe) of downstream Ganjiang River in Jiangxi Province changed greatly in recent years,and impacted the flood control,navigation and so on,so structure measures were planned.In order to verify the harnessing effect,2-D flow simulation mathematical model,verified by measured hydrological data,is established by Delft3D and used to simulate water level,cross-sectional velocity distribution and diversion ratio of the 2 rivers.The result shows that under the conditions of dry season and flood season,the structure measures have no obvious effect on diversion ratio control of the 2 bifurcated rivers,the upstream water level of Qiujiazhou beach drops slightly after the beach cutting and the downstream water level is uninfluenced;the cross-sectional flow velocity distributes more evenly,the dredging of Donghe River has a tendency of increasing its discharge capacity.The analysis results provide a basis for improving the structure measures.