径流和潮流共同作用下的福姜沙河段分流分沙不平衡性  

Imbalanced Flow and Sediment Diversion Ratio in Fujiangsha Reach under the Combined Action of Tide and Runoff

作　　者：刘高峰 LIU Gao-feng(Shanghai Estuarine and Coastal Research Center,Shanghai 201201,China)

机构地区：[1]上海河口海岸科学研究中心,上海201201

出　　处：《长江科学院院报》2023年第2期192-198,共7页Journal of Changjiang River Scientific Research Institute

基　　金：上海市科技创新行动计划(21DZ1201002)。

摘　　要：分流分沙比是研究分汊河段的一个重要指标。通过收集和分析2012—2019年长江口福姜沙河段实测水文资料,并采用了三维潮流泥沙数学模型ECOM-Sed对分流分沙进行计算研究。结果表明:上游径流增加或下游潮差减小均会导致福北水道的分流分沙不平衡度增加,航道的维护量和分流分沙不平衡度呈正相关性。福北水道仅有约30%的流量难以输移40%沙量,这种分流分沙比的不平衡性会导致福北水道航道严重淤积。根据研究成果,可在福姜沙目前的三座丁坝上实施加长或加高等工程措施,以降低福北水道的分流分沙不平衡性来减少福北航道的淤积量。In the study of branching rivers, flow and sediment diversion ratio is an important factor. The flow and sediment diversion ratio at Fujiangsha river reach in the Yangtze River Estuary was calculated according to in-situ data from 2012 to 2019 by using a 3D tidal-sediment numerical model ECOM-Sed. Result demonstrate that runoff increase in the upstream or tidal range decrease in the downstream would both intensify the imbalance between flow and sediment diversion. The factor of such imbalance is positively correlated with the amount of dredging maintainance of navigation channel. It’s difficult for the 30% discharge in Fubei channel to convey about 40% sediment flux. Such impbalance would result in severe silting in Fubei navigation channel. To alleviate the silting, engineering measures such as lengthening or heightening of the three existing groins at Fujiangsha reach can be taken to reduce the imbalance.

关 键 词：长江口 福姜沙河段 福北水道 分流分沙比 不平衡度 

分 类 号：TV85[水利工程—水利水电工程]