This is the Readme document to accompany the Supplementary files that provide the datasets to support the paper; TITLE: Acoustic propagation in gassy intertidal marine sediments: an experimental study AUTHORS: Timothy G. Leighton, Hakan Dogan, Paul Fox, Agni Mantouka, Angus I. Best, Gary B. R. Robb and Paul R. White JOURNAL: Journal of the Acoustical Society of America YEAR: 2021 ACKNOWLEDGEMENTS This work is funded by the Engineering and Physical Sciences Research Council (grant EP/D000580/1, Principal Investigator T.G. Leighton), with support for further analysis of data from the National Environment Research Council UK (Grant number NE/J022403/1, Principal Investigator T.G. Leighton). These Data (doi: 10.5258/SOTON/D1937) can be found at https://doi.org/10.5258/SOTON/D1937. ---oOo--- The files are as follows: ---oOo--- SuppPub1 provides the Environmental and Methods data. This file records the SuppPub1 data, specifically: - experiment locations on a map, - exact execution times, - the ambient temperature and salinity values during each experiment. In this file (SuppPub1), the calibrated source amplitudes, and the pulse lengths for the transmission experiment, are also shown. Moreover, an example acoustic signal (transmitted by the transducer and recorded by the first two receivers of the line array) and the cross-correlation of its envelopes recorded by Receiver 1 and Receiver 2 are provided. ---oOo--- SuppPub2 [parts (a) to (h)] gives the water tempeature recorded in an area near to the experimental sites (Bramble Bank) (50.79219279836252, -1.2883804619098287) at 5-minute intervals on (a) 10 April 2009, (b)15 April 2009, (c) 10 June 2009, (d) 11 June 2009, (e) 22 July 2009, (f) 25 July 2009, (g) 28 July 2009, and (h) 04 August 2009. The column ‘WTMP’ in the data shows the water temperature recordings. These SupplPub2 WTMP dataset consists of 8 files, one for each date of measurement, recording the data as indicated by the column headings, the abbreviations of which are defined as follows: TIME = time of observation WSPD = Wind Speed in knots WD = Wind Direction in degrees GST = Maximum Gust in knots ATMP = Air Temperature in degrees C WTMP = Water Temperature in degrees C BARO = Barometric Pressure in millibars DEPTH = Water depth in metres AWVHT = Average Wave Height in metres MWVHT = Maximum Wave Height in metres WVHT = Significant Wave Height in metres APD = Average Wave Period in seconds The date that the data was taken is given in Column O Row 1, showing that: SuppPub2a - WTMP - 10 April 2009 SuppPub2b - WTMP - 15 April 2009 SuppPub2c - WTMP - 10 June 2009 SuppPub2d - WTMP - 11 June 2009 SuppPub2e - WTMP - 22 July 2009 SuppPub2f - WTMP - 25 July 2009 SuppPub2g - WTMP - 28 July 2009 SuppPub2h - WTMP - 04 August 2009 ---oOo--- SuppPub3 provides the Transmission Experiment results (in SuppPub3, with ReadMe in SuppPub5). Group velocity and attenuation values at the Calshot site (a) on 10 April 2008, (c) on 10 June 2008 and (f) on 04 August 2008; and at the Mercury site (b, (c) on 15 April 2008 and (e) on 11 June 2008. In file (g), a statistical uncertainty analysis is provided that shows the mean and the standart deviation of the group velocity values, and the linear regression for the attenuation vs. frequency with the coefficient of determination (goodness-of-fit) values SuppPub3 [parts (a) to (g)] consists of 7 files recording the data from the transmission experiment. The mean and standard deviation for group velocity and attenuation are recorded, using data from 10 to 40 repeats for each pump frequency. In each file, the cell in Column A Row 1 indicates the date of the experiment and whether the data came from Mercury or Calshot. To be specific: SuppPub3a - Transmission_Calshot_10_April_2008 SuppPub3b - Transmission_Mercury_lower_15_April_2008 SuppPub3c - Transmission_Mercury_upper_15_April_2008 SuppPub3d - Transmission_Calshot_10_June_2008 SuppPub3e - Transmission_Mercury_11_June_2008 SuppPub3f - Transmission_Calshot_04_August_2008 SuppPub3g - Uncertainity - Group Velocity + Attenuation ---oOo--- SuppPub4 provides the Combination Frequency Experiment results (in SuppPub4, with ReadMe in SuppPub5), showing the received (scattered) pressure amplitudes (a) at the Calshot site on the 23 July 2008, and at the Mercury site (b) on 25 July 2008 and (c) 28 July 2008 SuppPub4 [parts (a) to (c)[ consists of 3 files recording the data from the combination-frequency experiment. The mean and standard deviation for the zero-to-peak acoustic pressure amplitude of the pump signal are recorded, using data from 10 to 40 repeats for each pump frequency. In each file, the cell in COlumn A Row 1 indicates the date of the experiment and whether the data came from Mercury or Calshot. To be specific: SuppPub4a - Combination_Calshot_23_July_2008 SuppPub4b - Combination_Hamble_25_July_2008 SuppPub4c - Combination_Hamble_28_July_2008 ---oOo---