Trend detection and stochastic simulation prediction of streamflow at Yingluoxia hydrological station, Heihe River Basin, China

Frontiers of Agricultural Science and Engineering

Chenglong ZHANG,Mo LI,Ping GUO¹ 

[1] Center for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China;

关键词: Monte Carlo|nonstationary|trend detection|streamflow prediction|decomposition and ensemble|Yingluoxia;   

DOI  :  10.15302/J-FASE-2016112

来源: DOAJ

【 摘 要 】

Investigating long-term variation and prediction of streamflow are critical to regional water resource management and planning. Under the continuous influence of climate change and human activity, the trends of hydrologic time series are nonstationary, and consequently the established methods for hydrological frequency analysis are no longer applicable. Five methods, including the linear regression, nonlinear regression, change point analysis, wavelet analysis and Hilbert-Huang transformation, were first selected to detect and identify the deterministic and stochastic components of streamflow. The results indicated there was a significant long-term increasing trend. To test the applicability of these five methods, a comprehensive weighted index was then used to assess their performance. This index showed that the linear regression was the best method. Secondly, using the normality test for stochastic components separated by the linear regression method, a normal distribution requirement was satisfied. Next, the Monte Carlo stochastic simulation technique was used to simulate these stochastic components with normal distribution, and thus a new ensemble hydrological time series was obtained by combining the corresponding deterministic components. Finally, according to these outcomes, the streamflow at different frequencies in 2020 was predicted.

【 授权许可】

Unknown