1,000. As shown at the bottom of the table, a total longshore flow rate of 303.7
ℓ/sec will be actively recirculated during the next segment of the experiment.
It should be noted that Columns 3 and 5 are not required to calculate the
pump discharge rates. However, they are always included in these calculations,
because they provide a simple means of quantifying the change in beach profile
depth in front of each flow channel (Column 5) relative to the initial beach
profile depth (Column 3). This is an important parameter to quantify and
monitor. For example, even though the target longshore current distribution
(Column 9) may not be adjusted for the next segment of the experiment, the
pump discharge rates may need to be adjusted slightly as the beach profile
continues to make minor adjustments during later segments of the experiment.
Setting the speed of the pumps
There are several steps involved in setting the pumps to achieve the required
discharge rates from the 20 vertical turbine pumps. First, the operator must
determine whether to use the low-flow or the high-flow mechanism for each of
the pump-and-piping systems discussed previously in the "Calibration and
Testing" section of Chapter 3.
Second, an estimate of the output frequency for each of the variable speed