基于复合衰退模型比率突变的基流分段衰退的临界流量确定方法  

A Method for Determining Critical Discharge of Baseflow Subsection Recession Based on the Ratio Mutation of Compound Recession Model

作　　者：布庆月 张润润[1] 周倩荟 BU Qingyue;ZHANG Runrun;ZHOU Qianhui(College of Hydrology and Water Resources,Hohai University,Nanjing 210024,Jiangsu,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210024

出　　处：《水力发电》2024年第12期33-38,共6页Water Power

基　　金：国家自然科学基金资助项目(41701016);中央高校基本科研业务费专项资金资助(B220202035)。

摘　　要：针对喀斯特流域基流衰退前后阶段由幂律向指数关系转换的临界流量较难确定的问题,提出了基于二元复合衰退模型,通过将主退水衰退过程中从大到小不同的流量分别设置为初始衰退流量,探求二元混合比率与初始衰退流量的关系,确定由幂律向指数关系转换的临界流量的方法。以沅江、资水20个子流域的衰退过程为研究对象,应用该方法确定临界流量并用分段衰退模型对衰退过程进行模拟。结果表明,退水衰退规律在某一特定初始衰退流量附近发生显著变化,混合比率也在该流量附近表现出显著的突变,验证了临界流量确定方法的有效性。基于临界流量分段退水模拟的纳什效率系数和相对均方根误差均优于复合模型,进一步证明了所确定临界流量的合理性。In view of the difficulty in determining the critical discharge of the flow curve transforming from the power-law to exponential relationship before and after the baseflow recession in Karst basin,a binary compound recession model is proposed to explore the relationship between the binary mixing ratio and the initial recession discharge by setting the different discharges from large to small during the master recession process as the initial recession discharge,and the method for determining the critical discharge when the flow transforms from the power-law to exponential relation is obtained.Taking the recession processes of 20 subbasins in Yuanjiang River and Zishui River as example,this method is applied to determine the critical discharge,and the recession processes are simulated with the subsection recession model.The results show that the recession law changes significantly near a specific initial recession discharge,and the mixing ratio also shows a significant mutation near the discharge,which verifies the validity of the method for determining the critical discharge.The Nash efficiency coefficient and relative root-mean-square error of the subsection recession model based on the critical discharge are better than those of the composite model,which further proves the rationality of the determined critical discharge.

关 键 词：基流衰退模型 复合衰退模型 临界流量 混合比率 幂律型规律 指数型规律 喀斯特流域 

分 类 号：TV11[水利工程—水文学及水资源]