小水电站减脱水段最小生态流量计算——以盘溪梯级水电站为例  

Calculation of minimum ecological flow in dewatering section of small hydropower stations:Taking Panxi cascade hydropower stations as an example

作　　者：李阳 林锦[1] LI Yang;LIN Jin(Nanjing Hydraulic Research Institude,Nanjing 210009,China;College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,南京210029 [2]河海大学水文水资源学院,南京210098

出　　处：《南水北调与水利科技（中英文）》2022年第3期536-543,共8页South-to-North Water Transfers and Water Science & Technology

基　　金：中央分成水资源费项目“小水电减脱水段生态流量保障对策制定项目”(Ss519040)。

摘　　要：以盘溪梯级水电站的大洋水库为例,采用改进的Tennant法、年内展布法、Q90法、改进的频率法以及NGPRP(northern great plains resource program)法计算大洋水库应下泄的最小生态流量。选取95%保证率为保护目标,通过进一步的合理性分析,分析5种方法在95%保证率下的满足程度,从而提出年内展布法和改进的频率法是最适合该地区的最小生态流量计算方法。在满足95%保证率的情况下,选取年内展布法和改进的频率法的内包线得到大洋水库应下泄的最小生态流量过程,并以此思路推求出盘溪梯级一级电站至四级电站区间最小生态流量过程。The hydropower resources of small and medium-sized rivers account for a large proportion of domestic hydropower distribution.There is a large space for development and utilization.The development and operation of hydropower inevitably bring adverse effects to the ecological environment,such as the reduction of river runoff,dewatering of local river reach,and the damage to the local ecological environment.To reduce the negative impact of the construction and development of small hydropower on the ecological environment of the downstream river,it is a key method to ensure the minimum ecological discharge of small hydropower.At present,the researches referring to the domestic and overseas ecological discharge mainly concentrate on big rivers.However,the research related to the ecological discharge of small and medium-sized rivers,especially small hydropower stations are few.The available methods for calculating the ecological discharge also lack scientific analysis.A considerable number of small hydropower stations have not yet determined the minimum ecological discharge.Based on this situation,the related research was carried out on the minimum ecological discharge of small hydropower stations.At present,domestic and overseas calculation methods of ecological flow can be roughly divided into the hydrological method,hydraulic method,habitat norm method,and integral method.The hydrological research method is the most commonly used,convenient,lowest cost of ecological flow calculation method and is one of the classic calculation method.This study uses the improved Tennant method,the annual distribution method,the Q90 method,the improved frequency method,and the NGPRP method to calculate the minimum ecological flow of the leading reservoir.Taking 95% guarantee rate of the runoff data from the recent 30 years as a protection target,this study analyzes the satisfaction degree of the five methods and evaluates the rationality of the calculation results.This shows the evaluating results of calculation in the process of nat

关 键 词：最小生态流量 盘溪梯级水电站 减脱水段 年内展布法 改进的频率法 

分 类 号：TV74[水利工程—水利水电工程] P33[天文地球—水文科学]