of a rip current warning system a rip
current is a fast flowing body of water
that travels away from the shore through
the surf zone that means that any
swimmer entering the water may find
themselves being swept out to sea and
dangerously out of their depth causing
them to potentially panic struggle and
possibly drown this slide shows a photo
of coffs harbor you can see the calm
water which may look inviting summers
however the calm water is a rip so far
in this presentation hang a second surf
lifesaving states that two out of three
people mistakenly think they can
identifier it now ladies and gentlemen
let me now present you a possible
solution I considered the following for
my design the system must have reliable
operation a long system life must be
environmentally friendly to humans
animals and plants and it must have a
simple design installation repair and
replacement the basic components of the
system are a flotation device or boi PV
a coiled elasticated has a coiled
control cable an elasticated cable and
an ankle secure fixing the flotation
device oh boy
floats on top of the water the PV cells
convert solar energy into electricity
the battery stores the electricity the
digital controller regulates the amount
of power transmitted through the system
the control cable the control cable
measures the water velocity and the
electrical and the elasticated cable
accommodates the change in water level
high and low you can see on the slide
the GPS or the status test this allows
people to remotely track where the
system is and see whether it is working
properly the control philosophy of the
system is based on the Ohm’s law that B
equals I times R V is the battery I is
the current and R is the cable the
control cable and its surroundings which
is water the ohms cable is influenced by
the total resistance equals cable
further research is necessary to
determine the control cable testing or
the control cable best suited for the
job this includes length diameter and
the materials you also need the
controller software and the coding and
even the spacing systems as reliability
and accuracy may be improved if multiple
systems were linked together in summary
this presentation has discussed the
problem of rip currents the design
considerations for my system the basic
will end this presentation with the
quotes whose high thing is really
relevant just because it’s just look as
it’s difficult it does not mean you
shouldn’t try thank you this is the end
of my presentation [Applause]