In order to clarify the re-regulation effect of daily regulatable hydroplants on the hydrological regime,based on the daily runoff data at Guide hydrographic station from 1954 to 2020,the hydrological variation diagnosis system and the indicators of hydrologic alteration-range of variability approach(IHA-RVA)were used to compare the effects of the multi-yearly regulatable and daily regulatable hydroplants(Longyangxia hydroplant and Nina and Laxiwa hydroplants)on the hydrological regime and the ecological environment.The results showed that the annual runoff series at Guide hydrographic station experienced a significant mutation in 1986.After the operation of Longyangxia hydroplant(a controllable hydroplant with multi-year regulating ability),the overall change rate of hydrological regime was88.51%,with28 indicators experiencing significant changes.After the superposition operation of the daily regulatable hydroplants(Nina and Laxiwa),the overall change rate of hydrological regime decreased to 75.24%,and the highly alternated hydrological indicators decreased to 15.The results show that the daily regulatable hydroplants(Nina and Laxiwa)has played a significant re-regulating role,reduced the impact of Longyangxia on the monthly runoff in flood season,the extreme flow,and other indicators,made the runoff alternation more similar to the natural period,but the flow changes are more frequent and the degree is intensified.
关键词
日调节水电站/控制性水电站/IHA-RVA法/水文情势/尼那-拉西瓦
Key words
daily regulatable hydroplant/controllable hydroplant/indicators of hydrologic alteration-range of variability approach(IHA-RVA)/hydrological regime/Nina-Laxiwa hydroplants
万方数据