基于变动范围法(RVA)的信江水文改变及生态流量研究  

Assessment of Hydrological Regime Alteration and Ecological Flow at Meigang Station of Xinjiang River

作　　者：刘贵花[1,2] 朱婧瑄 熊梦雅 王点[2] 齐述华[1,2] 

机构地区：[1]江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,江西南昌330022 [2]江西师范大学地理与环境学院,江西南昌330022

出　　处：《水文》2016年第1期51-57,共7页Journal of China Hydrology

基　　金：鄱阳湖湿地与流域研究教育部重点实验室(江西师范大学)开放基金资助项目(ZK2014003);江西省重大生态安全问题监控协同创新中心资助项目(JXS-EW-00);江西师范大学青年成长基金资助项目(6035)

摘　　要：选择信江下游梅港站1950~2010年日径流量,根据流域大型水库界牌枢纽运行时间将梅港站径流序列分为建库前（1953~2001）和建库后（2002~2010）两个时段。采用变动范围法（Range of Variability Approach,简称：RVA）分析水库运行对下游梅港站流域生态水文指标改变度,并分析了信江下游生态流量。研究表明：33个水文指标有22个发生中高度改变,11个指标发生低度改变,其水文综合改变度为0.51,属于中度改变;梅港站生态流量值均在RVA阈值内,基本能够保持河流稳定流量,但2月、7~9月及12月河道生态流量大于RVA下限。可适量增大水库下泄水量,降低对下游河段生态系统的威胁。The daily discharge at the Meigang Station of the Xinjiang River from 1953 to 2010 was selected and divided into two stages namely the original watershed （1953-2001） and the drainage with human impact （2002-2010）, based on the running time of the Jiepai Reservoir. The range of variability approach （RVA） which was proposed by Richer was used to study hydrological situation change. Then, the mean value and the difference values of RVA targets were used for estimating monthly ecological flow and transferable water at the Meigang station of the Xinjiang River. The results of ranked median degrees of 33 hydrologic alteration indicators indicate that about 22 indicators had highest or higher change and 11 indicators changed a little. The impacts of the Jiepai Reservoir on the hydrologic alteration is relatively significant with a mean hydrologic alterations （HA） value of 0.51. The values of ecological flow at the Meigang Station are within the RVA threshold that can basically maintain steady river flow to safeguarding river ecologica/security. However, the values of ecological flow on/ive months including Feb., Jul., Aug., Sep. and Dec. exceeded the lower limit of RVA value. Measures should be implemented such as increasing the amount of water discharged from reservoir in order to reduce the threat to downstream river ecosystems.

关 键 词：水文改变指标 变动范围法 水文情势 信江流域 

分 类 号：P333[天文地球—水文科学]