水利水电技术（中英文）2023，Vol.54Issue(12)：178-188,11.DOI:10.13928/j.cnki.wrahe.2023.12.015
1960年以来赣江流域生态径流变异机制及生态效应研究
Study on variation mechanism and ecological effect of eco-flows in the Ganjiang River Basin since 1960
摘要
Abstract
[Objective]In the context of global change,scientific understanding of the change mechanism of catchment eco-flows is crucial to local water resources optimization and drought mitigation.[Methods]Based on the daily runoff of the upper,middle and downstream hydro-stations of the Ganjiang River Basin from 1960 to 2018,adaptive range of the eco-flow of the Ganjiang River and the eco-deficit and eco-surplus were calculated according to discharge hydrograph,and the variation characteristics of the eco-flows in the Ganjiang River Basin were quantitatively analyzed.On this basis,the standardized precipitation evaporation index(SPEI)and Shannon index(SI)and their fitting connections with eco-flow indices were calculated,and the driving mech-anism and ecological impact of eco-flows change in the Ganjiang River Basin were further explored.[Results](1)adaptive range of eco-flows varies significantly among the upper,middle and downstream of the Ganjiang River Basin,and the ecological suitable flow at the same station also varies greatly in different months.(2)The degree of eco-deficit variance steadily decreases from upstream to downstream,whereas the degree of eco-surplus variation slightly increases.The eco-deficit of each site showed the characteristics of"high-low-high"interdecadal fluctuation at a low level,while the change pattern of eco-surplus was oppo-site.(3)Eco-surplus shows a positive correlation with SPEI,while negative correlation was observed for eco-deficit.The eco-surplus of the middle-lower stream of the Ganjiang River increased during dry and wet periods before and after the construction of Wan'an Reservoir,while it decreased during the normal water period.(4)The relationship between SI and the eco-surplus main-ly shows a linear positive correlation,while the relationship between SI and eco-deficit is better represented by an exponential negative correlation.The SI of each station showed a slight downward fluctuation before 1985,and the fluctuation amplitude in-creased significantly thereafter.[Conclusion]The eco-flow changes of in the Ganjiang River Basin in the past 60 years were af-fected by climate and human activities.The dry/wet climate conditions are the key factors causing changes in river eco-flows.The construction of main stream reservoirs have a significant impact on enhancing the eco-surplus of downstream rivers.The biodiversity of rivers is closely correlated to the change of eco-flows.The research result provide a scientific basis for the improved understanding of eco-flows variation mechanism,water resource optimization,and water ecological construction theory in the Ganjiang River Basin.关键词
生态径流/水文变异/标准化降水蒸发系数/生物多样性指数/赣江流域/水库建设/人类活动Key words
eco-flow/hydrological alterations/standardized precipitation evaporation index(SPEI)/Shannon index(SI)/Gan-jiang River Basin/reservoir construction/human activing分类
天文与地球科学引用本文复制引用
段红鑫,孔志岗,叶许春,袁燕萍,刘婷婷,李相虎,张增信..1960年以来赣江流域生态径流变异机制及生态效应研究[J].水利水电技术（中英文）,2023,54(12):178-188,11.基金项目
国家自然科学基金项目"通江湖泊水文变异的复合驱动机制及洪泛湿地生态效应"(42071028) （42071028）
