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Title: Characterization of a cavern conduit system in Vietnam by time series correlation, cross-spectrum and wavelet analyses
Authors: Tam, VT ×
De Smedt, Florimond
Batelaan, Okke
Dassargues, Alain #
Issue Date: Jan-2004
Publisher: Iahs press, inst hydrology
Series Title: Hydrological sciences journal-journal des sciences hydrologiques vol:49 issue:5 pages:879-900
Abstract: Time series analyses are applied to characterize the transient flow regimes of the Nam La cavern conduit, northwest Vietnam. The conduit transforms the input signal to an output signal, and the degree of transformation provides information on the nature of the flow system. The input for the analysis is net precipitation and the flow hydrograph at the cave entrance, while the output series is the flow hydrograph at the resurgence. Cross-correlation and cross-spectrum analysis are used to investigate the stationarity and linearity of the input-output transformation of the system, resulting in hydrodynamic properties such as system memory, response time, and mean delay between input and output. It is shown that during high flow periods, the flow in the conduit is pressurized. Consequently, the linear input-output assumption holds only for low flows. To highlight the hydrodynamics of the cavern conduit for the high flow periods, wavelet spectrum and wavelet cross-spectrum analyses are applied.
ISSN: 0262-6667
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Earth and Environmental Sciences
Division of Geology
× corresponding author
# (joint) last author

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