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Study on mechanism-based reconstruction method to cope with
the nonstationary change of hydrological series

QIN Yi，LI Shi
（State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China，Xi’an University of Technology，Xi’an 710048，China）

Abstract： The nonstationarity of hydrological series lead to the theoretical bottleneck of many commonly
used hydrological analysis and calculation methods， which have not been effectively solved and still needs
to be explored and studied continuously. From the point of view of the relationship between depend vari⁃
able and independent variables，the reason for the nonstationary change of hydrological variable is the non⁃
stationary change of its influencing factors. On this basis，the concept of mechanism function of single influ⁃
ence factor acting on hydrological variable is put forward from the perspective of physical mechanism. Ac⁃
cording to the statistical multiplication model established between hydrological variable and influence factor
mechanism functions，a new function is constructed，and based on this new function，the effect of nonsta⁃
tionary influence factors on hydrological variable is removed from the original series. The reconstruction of
hydrological series realizes the transformation from the nonstationary series to a new stationary reconstruction
series， so this method is called the Mechanism-based Reconstruction Method （MBRM） The reconstructed
.
series can be used in all the stationary series-based analysis and calculation work. The application research
of the nonstationary maximum annual flood peak discharge series in the Jialuhe River basin shows that the
MBRM can not only removes the linear，nonlinear trend and abrupt change of hydrological series，but also
the distribution of the reconstructed series is more consistent with the sampling characteristics of the origi⁃
nal series. The decomposition and synthesis method can only remove the trend in the first moment of the
series，while the MBRM can play a role in removing the nonstationarity in the first and second moments.
Keywords： hydrological series； nonstationarity； mechanism function； mechanism-based reconstruction func⁃
tion；reconstructed stationary series
（责任编辑：韩 昆）

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