不同整治工程条件下赣江尾闾河网水流特性试验研究

赣江尾闾为冲积性多级分汊型河道,分为西河、东河。西河在裘家洲头,分西支和北支;东河在杨子洲头,分中支和南支。近年来人类各类活动使得赣江尾闾水文情势发生根本变化,对下游水资源利用、水生态环境等带来一系列影响。为了研究赣江尾闾综合整治工程对河段水流特性的影响,采用物理模型试验,重点分析了赣江尾闾河道在不同整治方案下的洪水位、分流比、流速分布等对河网河势的影响。试验结果表明:赣江尾闾北支控堵整治方案对各支沿程洪水位、分流比、流速分布影响较大;而南支疏浚、四支建闸的影响较小,南支疏浚后对工程河段内流速分布的影响主要在于主流线向左岸偏移,而对断面最大流速的影响较小。试验成果对优化整治工程方案具有重要参考作用。

Effects of Regulation Projects on Flow Characteristics in Tail Channels of Ganjiang River

As alluvial bifurcate channels, the tail channels of Ganjiang River are divided into West River and East River, of which the former evolved into west branch and north branch and the latter developed into middle branch and south branch. In recent years, human activities has fundamentally changed the hydrologic regime of the tail reaches of Ganjiang River, hence affecting the water resources utilization and water eco-environment in the downstream. In the purpose of investigating the effects of regulating projects, we examine the influences of flood level, water diversion ratio, and flow velocity distribution on the river regime in the presence of different regulating projects via physical model test. Test results verify that controlled blocking project in the north branch has apparent effect on the flood level, water diversion ratio, and flow velocity distribution in each branch, whereas dredging in the south branch and building sluices in the four branches have slight impact. Dredging in the south ranch mainly results in the shift of major streamline towards the left bank, while has little impact on sectional maximum flow velocity. The test results offer reference for the optimization of the regulation projects.