摘要
针对南汀河中上游河段引水式电站梯级开发引起天然河道脱水以及《临沧市南汀河保护管理条例》规定的“下泄生态流量不低于多年平均流量的10%”不能真实反映生态流量随季节性变化的问题,基于南汀河大文水文站55年、姑老河水文站60年日平均流量数据,利用水文学方法中的Tessman法和月流量变动法,计算了南汀河各控制断面河道内适宜生态流量。结果表明:Tessman法生态需水量大于月流量变动法;Tessman法和月流量变动法生态流量变化趋势与天然径流量变化趋势一致;月流量变动法计算的生态流量满足率大于Tessman法。综合生态需水量、生态流量随季节性变化和满足率方面的因素,用月流量变动法计算南汀河这类丰枯水随季节变化比较明显的河流的适宜生态流量,结果更符合实际。建议按本文分析计算成果,对南汀河流域不同河段的生态流量进行重新修订,并发布执行。
Appropriate ecological flow is the guarantee of river health.Analysis and calculation of the appropriate ecological flow of rivers has important practical significance.Nanting River,as the mother river of Lincang City,may be dehydration due to rapid development of diversion power station in the upper reaches and that relevant regulations content(Any organizations and individuals who draw water from the Nanting River Basin shall simultaneously design,construct,and use ecological flow discharge facilities to ensure that the discharge flow is not less than 10%of the average flow for many years)in“Lincang City Nanting River Protection and Management Regulations”cannot truly reflect the seasonal changes in ecological flow.Using the 55-year daily average flow datum of Nanting River Dawen Station and 60 years of Gulaohe Station,Using Tessman method and monthly flow variation method were adopted to calculate the suitable ecological flow in the river channel of each control section in Nanting River.The results showed that the ecological water demand of Tessman method was greater than that of monthly flow variation method.The change trend of ecological flow by Tessman method and monthly flow change method were consistent with that of natural runoff.The satisfaction rate of ecological flow calculated by monthly flow variation method was greater than that calculated by Tessman method.Based on the factors of ecological water demand,seasonal variation of ecological flow and satisfaction rate,the monthly flow variation method was used to calculate the suitable ecological flow of rivers with obvious seasonal variation such as Nanting River,and the results seemed more realistic.According to the analysis and calculation results of this paper,it was suggested to revise the ecological flow of different river sections in the Nanting River Basin and to issue it for implementation.
作者
陈荣
徐晓鹏
马建顶
CHEN Rong;XU Xiao-peng;MA Jian-ding(Lincang Branch of Yunnan Hydrology and Water Resources Bureau,Lincang Yunnan 677000,China)
出处
《环境科学导刊》
2022年第4期25-29,共5页
Environmental Science Survey
关键词
季节性河流
日平均流量数据
水文学法
适宜生态流量
南汀河
seasonal river
daily average flow data
hydrological method
suitable ecological flow
Nanting River
