长江科学院院报2024，Vol.41Issue(12)：29-39,11.DOI:10.11988/ckyyb.20240751
典型年螺山站水位-流量关系变化及成因分析
Variation Trend and Causes of Stage-Discharge Relationship at Luoshan Station in Typical Years
摘要
Abstract
Luoshan hydrological station serves as a crucial flood control base in the middle reaches of the Yangtze River as it is located at the confluence of mainstream Yangtze River and the outflow of Dongting Lake with complex stage-discharge relationship.We analyzed the trends and influencing factors of stage-discharge relationship at Luos-han Station under erosion conditions by employing the M-K test method,Theil-Sen Median method,and a compre-hensive correction approach for stage-discharge relationship based on measured water level and discharge data from 1990 to 2021 and typical river section data for selected years.Our key findings are as follows:1)The water levels at Luoshan Station for low and medium discharges significantly decreased,which was consistent with the decline of the centroid elevation of low water-level channel and basic channel.Conversely,the water level at flood discharges exhibited large fluctuation range,yet with a non-significant upward trend.2)The operation of the Three Gorges Reservoir has narrowed the fluctuation range of water level differences between Luoshan Station and Hankou Sta-tion,leading to an overall increase in the average water level difference.However,after 2013,the water level difference within flood flow intervals reduced,potentially exacerbating topwater conditions at Luoshan station during the flood season.During continuous flooding events in 2016 and 2020,contributions from topwater elevation,fluc-tuation rate,and other influencing factors at Luoshan Station averaged 34.8％,23.8％,41.4％and 31.4％,50.6％,and 18.0％respectively;indicating that topwater elevation and fluctuation rate are primary influencing fac-tors on water levels while other contributing factors may have larger proportions in certain years.关键词
水位-流量关系/下游顶托/涨落率/河道形态调整/螺山站Key words
stage-discharge relationship/downstream jacking/rate of fluctuation/channel geometry adjustment/Luoshan station分类
建筑与水利引用本文复制引用
陈致远,梅翰林,金光球,郭超,金中武..典型年螺山站水位-流量关系变化及成因分析[J].长江科学院院报,2024,41(12):29-39,11.基金项目
长江水科学研究联合基金项目(U2040205,U2240206) （U2040205,U2240206）
国家重点研发计划项目(2022YFC3202602) （2022YFC3202602）
湖南省水利科技项目(XSKJ2022068-39) （XSKJ2022068-39）
