基于RVA阈值区间集成的河道内生态需水计算与应用

Integrated calculation of ecological water demand of rivers based on RVA threshold interval and its application

在对河道生态需水特点进行分析和总结的基础上,提出了基于变化范围法和多种水文学法计算成果的河道内生态需水计算方法——下包线法,建立了考虑径流资料精度的评价体系。结合一致性审查、河道内生态需水计算和评价,构建了考虑径流非一致性的河道内生态需水计算框架,并应用于陕西省引汉济渭工程。结果表明:河道内生态需水过程具有波动性、季节性、时效性和区间性;在生态需水阈值区间内,下包线法同时满足维护河道生态和保证兴利效益的目的,可在较高生态需水标准基础上进一步压缩生态需水总量;下包线法和Tennant法中Tennant-好、Tennant-差所得生态需水过程分别为引汉济渭工程理想、适宜和最低生态需水过程。

Based on analysis and summary of the characteristics of ecological water demand of rivers,the lower envelope method based on the range of variability approach and results of multiple hydrological methods was proposed,and an evaluation system considering the accuracy of runoff data was established.A calculation framework of the ecological water demand of rivers considering the runoff inconsistency was constructed based on the consistency review and calculation and evaluation of the ecological water demand of rivers,and it was applied to the Hanjiang to Weihe River Water Diversion Project.The results show that the ecological water demand process of the river has the characteristics of volatility,seasonality,timeliness,and range;within the ecological water demand threshold interval,the lower envelope method can meet the requirements of maintaining river ecology and ensuring profitability,and it can further decrease the total ecological water demand with higher ecological water demand standards;the lower envelope method and the good and poor levels of the Tennant method can be used to obtain ideal,suitable,and minimum ecological water demand processes of the Hanjiang to Weihe River Water Diversion Project,respectively.