The ground-based approach requires set-up of a camera within sight of the master channel to acquire flow dimensions and velocity.
Because our observations were made during a period of waning activity, where flow levels and velocities in the master channel underwent a noticeable decline after 11 30 on 1 August, we used Jeffreys (1925) to estimate flow velocities under peak-flow conditions.
The input signal to the master channel A is used for detection of the triggering, and the waveform of the slave channel B is recorded in synchronization with channel A. Since the size of the onboard buffer is for 130 waveforms per channel, up to the last 130 waveforms are saved with their time stamp.
In addition, the tools which PointCast supplies allow Hornung to customize the master channel feed with the pieces HP wants.
In addition, thermal video was taken at the head of the master channel where it exited the eruptive fissure for 5 min at 11 40 on 1 August, and a water-quenched sample was collected from the same location at 13:13.
As is shown in the sand content map for SQK1g0 (Fig. 8), the master channel for sand entering Yaxi area was located at the hinge zone of the transverse uplift.
Fig. 7 FLOWGO run, in terms of velocity of lava flowing in the master channel with distance from the vent, using the first TADR values received during the May 2015 eruption.
Fig. 16 FLOWGO run, in terms of velocity of lava flowing in the master channel with distance from the vent, using the first TADR values in the range 10 26 m3/s down the May 2015 LoSD.
Aerial photographs taken by journalists during the opening day of the eruption (H. Douris, Le Journal de L'Ile de la Réunion, 02/08/15, p. 7) reveals the master channel to have been brim full (i.e., flow depth = 3 m) at that point.
Fig. 15 FLOWGO run, in terms of velocity of lava flowing in the master channel with distance from the vent, using the first TADR values (in m3/s) received from MIROVA during 2 4 September 2015, along with field-measured flow lengths for the same period.
