Formation of dilute versus concentrated pyroclastic density currents in the impact zone of eruptive fountains: an experimental study

Figure_3: The folder "Figure_3" contains the data for each experiment. The file naming convention is as follows:I_and_Lmix_<H_in_cm>cm_<particle_size>. Each file includes: the distance between the acoustic sensors (L_acoustic), the channel width (L_channel), the full spatial profiles (L_profile), the time series associated with the mixture width (t_Lmix, Lmix), and the corresponding light intensity measurements at two different times (intensity_profile_t1 and intensity_profile_t2). The subsets of these raw profiles used to determine Lmix are provided separately. These are named: L_profile_fin1 and intensity_profile_fin1 for time 1, L_profile_fin2 and intensity_profile_fin2 for time 2. Figure_4: The folder "Figure_4" contains the data for each experiment. The file naming convention is as follows:Umix_and_St_<H_in_cm>cm_<particle_size>. Each file includes: the theoretical free-fall velocity (U_lim), the time series associated with the mixture velocity (t_Umix, Umix), the time series associated with the Stokes number (t_St, St), and the shaded bands representing the uncertainty on St, provided as (x_patch, y_patch). Figure_5: The folder "Figure_5" contains the data for each experiment. The subfolder naming convention is as follows:<H_in_cm>cm_<particle_size>. Each subfolder contains the following files: Alpha_and_Freq_<H_in_cm>cm_<particle_size>:Contains the Fast Fourier Transform (FFT) of the propagated signals (F_alpha_plot), the associated attenuation coefficient (ALPHA_plot), and the corresponding fitted data (F_fit_plot, AMENT_fit_plot). Magm_and_Freq_<H_in_cm>cm_<particle_size>:Contains the Fast Fourier Transform (FFT) of the propagated signals (F_plot) and the associated magnitude (AMPL_plot). t_and_phi_<H_in_cm>cm_<particle_size>:Contains the experimental time (time_aff), the associated particle concentration (phi_aff), the transition time (transition), and the end time of the experiment (end_exp). t_star_and_A_<H_in_cm>cm_<particle_size>:Contains the pulse propagation time (t_star) and the corresponding amplitude (A). Figure_6: The folder "Figure_6" contains the data for each experiment. The file naming convention is as follows:I_and_h_<H_in_cm>cm_<particle_size>. Each file includes: the time series associated with the mixture intensity measurements (t_I, I_mix), the time series associated with the current intensity measurements (t_I, I_current), the time series associated with the bed height measurements (t_h, h), the transition time (transition), and the shaded bands representing the uncertainty on I_mix (x_patch, y_patch_mix) and on I_current (x_patch, y_patch_current). Figure_7: The folder "Figure_7" contains the data for each experiment, including: the transition values of particle concentration (Phi_trans) and their associated uncertainties (sdPhi_trans), the transition values of the Stokes number (St_trans) and their associated uncertainties (sdSt_trans), the transition values of the volumetric flux per unit area (Phi_U_trans) and their associated uncertainties (sdPhi_U_trans), the fitted series associated with the relationship between particle concentration and Stokes number (x_fit, y_fit1), and the fitted series associated with the relationship between volumetric flux per unit area and Stokes number (x_fit, y_fit3). Figure_S1: The folder "Figure_S1" contains the data for each experiment. The file naming convention is as follows:Q_<H_in_cm>cm_<particle_size>. Each file includes: the time series associated with the mass flow rate of the mixture (t, Q_mix). Figure_S2: The folder "Figure_S2" contains the data for each experiment. The file naming convention is as follows:Mass_cum_<H_in_cm>cm_<particle_size>. Each file includes: the time series associated with the cumulative mass of the mixture (t, Mass_cum). Figure_S3: The folder "Figure_S3" contains the data for each experiment, including: the transition values of the Reynolds number (Re_trans) and their associated uncertainties (Sd_Re_trans), the particle diameter (dp), the threshold value of the turbulent regime (Re_lim). Figure_S4: The folder "Figure_S4" contains the data for each experiment, including: the transition values of mass flow rate (Q_trans) and their associated uncertainties (sdQ_trans), the transition values of the Stokes number (St_trans) and their associated uncertainties (sdSt_trans), and the fitted series associated with the relationship between mass flow rate and Stokes number (x_fit, y_fit2). Figure_S5: The folder "Figure_S5" contains the data for each experiment, including: a kymograph of grayscale intensity extracted from the experiment (Larg_flux_var.tif). The horizontal axis corresponds to the spatial coordinate of the profile (L_profile), and the vertical axis corresponds to time. the three intensity profiles corresponding to the dense regime (I_profile1), the transition regime (I_profile2), and the dilute regime (I_profile3). the intensity threshold values used to characterize the signal. c12_low, c12, and c12_up represent the reference thresholds for the dense and transition regimes, corresponding respectively to −5% tolerance, the nominal threshold, and +5% tolerance. Similarly, c3_low, c3, and c3_up represent the reference thresholds for the dilute regime with the same ±5% tolerance.