psd - Adaptive, Sine-Multitaper Power Spectral Density and Cross Spectrum Estimation

Produces power spectral density estimates through iterative refinement of the optimal number of sine-tapers at each frequency. This optimization procedure is based on the method of Riedel and Sidorenko (1995), which minimizes the Mean Square Error (sum of variance and bias) at each frequency, but modified for computational stability. The same procedure can now be used to calculate the cross spectrum (multivariate analyses).

Last updated 1 years ago

multitaperpower-spectral-densitypower-spectrumpsdspectral-density-estimatesspectrum

7.12 score 9 stars 1 packages 122 scripts 865 downloads

kitagawa - Spectral Response of Water Wells to Harmonic Strain and Pressure Signals

Provides tools to calculate the theoretical hydrodynamic response of an aquifer undergoing harmonic straining or pressurization, or analyze measured responses. There are two classes of models here, designed for use with confined aquifers: (1) for sealed wells, based on the model of Kitagawa et al (2011, <doi:10.1029/2010JB007794>), and (2) for open wells, based on the models of Cooper et al (1965, <doi:10.1029/JZ070i016p03915>), Hsieh et al (1987, <doi:10.1029/WR023i010p01824>), Rojstaczer (1988, <doi:10.1029/JB093iB11p13619>), Liu et al (1989, <doi:10.1029/JB094iB07p09453>), and Wang et al (2018, <doi:10.1029/2018WR022793>). Wang's solution is a special exception which allows for leakage out of the aquifer (semi-confined); it is equivalent to Hsieh's model when there is no leakage (the confined case). These models treat strain (or aquifer head) as an input to the physical system, and fluid-pressure (or water height) as the output. The applicable frequency band of these models is characteristic of seismic waves, atmospheric pressure fluctuations, and solid earth tides.

Last updated 10 months ago

harmonic-strainsseismic-wavesseismometerstrainstrainmeterwater-levelwater-well

5.21 score 3 stars 27 scripts 250 downloads

kelvin - Calculate Solutions to the Kelvin Differential Equation using Bessel Functions

Uses Bessel functions to calculate the fundamental and complementary analytic solutions to the Kelvin differential equation.

Last updated 4 years ago

4.18 score 1 packages 5 scripts 175 downloads