Chaos Studies on Series of Groundwater Depth in Sanjiang Plain
LI Guo-liang · DOAJ (DOAJ: Directory of Open Access Journals) · 2008
It is the largest swamp area of freshwater and the important production base of commodity food grain in China.The groundwater resource plays an important role in the development of well-irrigation paddy.The groundwater system is one kind of complicated nonlinear system.Firstly,the series of groundwater depth in sanjiang plain were analyzed qualitatively through power spectral analysis.Secondly,the conclusion that there is obvious chaos characteristic in the series of groundwater depth in Sanjiang plain was drawn through calculating the characteristic quantities,which are the Kolmogorove entropy and the correlative dimension of groundwater depth series,based on the reconstruction of state space.At last,the method of local adding-weight linear regression forecasting based on degree of incidence was applied to the series and the ideal results were got.The theoretical evidence would be provided for applying the chaos theory to study the variable law of groundwater depth in Sanjiang plain.