摘要
水资源开发利用改变了河流天然水文情势,影响了河流生态环境,提供适宜的生态流量对保障河流系统健康具有重要意义。考虑径流非一致性及数据冗余,运用M-K检验法、累积距平法、PCA-IHA指标体系等能更准确地判断河流水文情势的改变程度;基于生态流量计算的水文学法,建立了完整的生态流量适宜性评价体系,提出了阈值区间保证率、偏差指数、达标率等3个评价指标,并综合成适宜性指数这一综合指标,在赣江干流进行应用。结果表明:①赣江干流1960~2015年的水文情势改变度较低,变异点为1991年;②各水文学法在所提出的评价指标中各有优劣,且适宜性指数差异较大,说明该评价体系可以较好地筛选出对研究区域适用的计算方法,其中赣江干流最适宜的为逐月频率法,适宜性指数为0.8。研究成果可为完善生态流量适宜性评价体系提供科学参考。
The exploitation and utilization of water resources have changed the natural hydrological regime of rivers and impacted the ecological environments of rivers.Ensuring a suitable ecological flow is crucial for the preservation of river ecosystems.Considering the runoff inconsistencies and the data redundancy,we employ the M-K method,Cumulative Offset Verification and the PCA-IHA index system to evaluate the alteration degree of a hydrological regime more accurately.A comprehensive ecological flow suitability evaluation system is established based on the hydrological method of ecological flow calculation.We propose three evaluation indexes such as the threshold interval guarantee rate,deviation index,and standard compliance rate,and then establish a suitability index synthetically.The application of this system to the mainstream of the Ganjiang River revealed that:①The alteration degree of the hydrological regime in the Ganjiang River mainstream from 1960 to 2015 was low,with a variation point in 1991.②Each hydrological method has its strengths and weaknesses in the proposed evaluation index,and the suitability index varies significantly,which indicates that this evaluation system can effectively filter out the calculation method most suitable for the study area.In the case of the Ganjiang River mainstream,the most suitable method is the monthly frequency method,with a suitability index of 0.8.The research results can provide a scientific reference for improving the suitability evaluation system of ecological flow.
作者
赵渔亨
晁立强
王远坤
李然
王远铭
ZHAO Yuheng;CHAO Liqiang;WANG Yuankun;LI Ran;WANG Yuanming(State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China;China Water Resources Beifang Investigation,Design and Research Co.LTD.,Tianjin 300222,China;School of Water Resources and Hydropower Engineering,North China Electrical Power University,Beijing 102206,China)
出处
《人民长江》
北大核心
2024年第2期101-108,124,共9页
Yangtze River
基金
国家自然科学基金项目(U2240212)。
关键词
生态流量
适宜性评价
水文学法
水文情势
赣江
ecological flow
suitability evaluation
hydrological method
hydrological regime
Ganjiang River
