The investigation was intended to find out how a specific material would behave when discharged as a slurry below sea level. I would emphasize the words 'specific material' as the work which was done on material of a similar type but slightly different gradings showed that it was difficult, if not impossible, to formulate general conclusions of universal application.75. The model tests were on a large scale and observation and measurement during the course ofthe tests was difficult because of the limited visibility in the zone of slurry flow. In most of the tests it was quite impossible to see the tank floor, and therefore to see what was happening to the slurry flow.76. In the diffusion tests slurry was discharged on the centre line of the tank and at 4 m from the end wall. Measurements were made of the slurry concentration and the deposit on a series of radial lines from the outfall, and velocity measurements were made on sections across the tank at 4, l+, 2+ and 5 m from the pipe outlet. In one test, a rectangular diffuser, 15 cm wide and 13 cm high, replaced the end 60 cm of the outlet pipe. The slurry, although it expanded laterally, did not expand to the full height of the diffuser; there was a dense layer about 5 cm thick with a further 2 or 3 cm above it as a light cloudy layer with turbulent mixing on the interfaces. The diffuser had virtually no effect on the final deposit profile.77. The base of the flume in which the critical slope tests were performed was treated with resin and sprinkled with 1-2 mm grain sand before testing began. The deposit depth was measured on 13 sections at l+ m intervals down the length of the flume.78. One of the objects of the critical slope tests was to study the gradings of the deposits with a view to analysing where particles of a particular size settled out. Table 2 shows the coarsening of deposit at the upper end of the flume with increasing bed slope.79. The curves shown in Fig. 12 are typical of those obtained by the direct plotting of all these test results. There was considerable scatter of the results and the curves represent only a first step in averaging out these variations.80. From Fig. 12 a graph was prepared of the form shown in Fig. 14 from which the figures quoted in the text were derived. Fig. 14 shows a variation of the critical slope with concentration, but slurry concentrations greater than 1.4 are unlikely to be acceptable from the point of view of economics of pipeline size and pumping.81. The float tracks suggested that an outfall offshore from a line joining Dodman Point to Gribben Point and the Lizard would lie within the general sphere of influence of the main transporting currents which are known to exist in the English Channel. Floats released on the landward side of the line (e.g. from F3) tended to circulate within the smaller bays or travel close to the coastline, whereas floats released in the region of the outfall tended to move within an ellipse with its long axis along the main tidal flow.82. The sea bed profile at the outfall consisted ...
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