人民长江2025，Vol.56Issue(7)：25-33,9.DOI:10.16232/j.cnki.1001-4179.2025.07.004
考虑降雨年内变化的河道生态流量计算水力学法
Hydraulics method for calculating river ecological flow considering intra-annual rainfall variations
摘要
Abstract
To address the limitation of existing hydraulic methods in calculating ecological flow in rivers,which fail to adequate-ly account for intra-annual variations in water inflow in mountainous rivers,this study takes three cascade hydropower stations on the Liuxi River in Guangdong Province as an example.An improved hydraulic method for calculating ecological flow was pro-posed,incorporating intra-annual rainfall variations.Based on the appropriate water requirements of aquatic organisms in the riv-er and the monthly distribution of rainfall in the basin,the water depth,flow velocity,and monthly wetted perimeter ratio standards for river cross-sections were determined,thereby the monthly ecological flow for each section was calculated.The calculated monthly ecological flows were compared with the evaluation criteria of Tennant method and the results of wetted perimeter method.The results showed that the monthly ecological flows of the three cascade hydropower stations all exceed the values corresponding to the 10%(fair condition)evaluation standard of the Tennant method,reaching the 40%(good condition)standard during high-flow periods,which helped maintain the stability of the aquatic ecosystem in the river during low-flow periods.Compared to the wetted perimeter method,the monthly ecological flow calculations for the three cascade hydropower stations better aligned with the ecological needs of the river under different inflow conditions.Considering the impact of intra-annual rainfall variations,determi-ning monthly ecological flow values through period-based can achieve refined ecological flow management in river channels.关键词
生态流量/湿周率/水力学法/降雨分布/广东省流溪河Key words
ecological flow/wetted perimeter ratio/hydraulic method/rainfall distribution/Liuxi River in Guangdong Prov-ince分类
建筑与水利引用本文复制引用
王志华,何艳虎,刘树锋,关帅..考虑降雨年内变化的河道生态流量计算水力学法[J].人民长江,2025,56(7):25-33,9.基金项目
国家自然科学基金项目(51979043) （51979043）
广州市科技计划项目(2025A04J7057) （2025A04J7057）
