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Appendix AA to B Part 1 Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs THIS PAGE KEPT BLANK Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Assessment of Level to Sound Bedrock from Piling Records Levels to sound bedrock have been derived in Table 8 from the 2012 beach profile at Portsea Pier and the piling records from 2007 following. The result is plotted in Figure 35 and indicates that, offshore of Portsea Pier, the level of sound bedrock is likely to be around -10 m AHD. Table 8. Derivation of level of sound bedrock Embeddment Seabed Level| Rock Level Pile Bent Chainage Depth to Refusal (m AHD) (m AHD) (m) 44 157 -4.3 5.2 -9.5 43 154 -4.3 5.6 -9.9 42 151 -4.1 5.8 -9.9 42 151 -4.1 5.4 -9.5 41 148 -4.1 5.4 -9.5 39 141 -3.6 5.5 -9.1 38 138 -3.3 5 -8.3 37 135 -3.6 5.3 -8.9 36 131 -3.7 5 -8.7 36 131 -3.7 4.8 -8.5 36 131 -3.7 5.3 -9 35 128 -3.7 4.75 -8.45 35 128 -3.7 4 -7.7 34 125 -3.7 5 -8.7 34 125 -3.7 4.7 -8.4 34 125 -3.7 4.8 -8.5 33 122 -3.5 5.1 -8.6 33 122 -3.5 4.8 -8.3 32 119 -3.4 5 -8.4 32 119 -3.4 5.8 -9.2 31 115 -3.2 5.3 -8.5 Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Embeddment Seabed Level| Rock Level Pile Bent Chainage Depth to Refusal (m AHD) (m AHD) (m) 31 115 -3.2 5.3 -8.5 30 112 -3.2 5.5 -8.7 30 112 -3.2 5.5 -8.7 29 109 -3.2 5.6 -8.8 29 109 -3.2 5.5 -8.7 28 106 -3.2 4.3 -7.5 28 106 -3.2 5 -8.2 28 106 -3.2 4.55 -7.75 27 102 -3.2 4.62 -7.82 27 102 -3.2 4.17 -7.37 27 102 -3.2 4.2 -7.4 25 96 -3.2 3.1 -6.3 2012 Profile Mean Water Level (AHD) Portsea Pier Level Sound Rock 3 2 1 0 -1 -2 -3 -4 -5 Level (m AHD) Level -6 -7 -8 -9 -10 -11 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 Chainage (m) Figure 35. Bedrock levels as determined from piling records at Portsea Pier. Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Appendix BB: Dredging Methodology Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs THIS PAGE KEPT BLANK Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Introduction Sand for beach nourishment would be dredged from offshore borrow areas shown in Figure 36. The preferred dredging method is known as suction dredging systems. Figure 36. Possible borrow area for beach sand nourishment Suction Dredging Systems The well–proven Pnuema and Dragflow Dredging Systems are typical (Figure 37). Figure 37. Typical pnuema suction pump dredge (left) and dragflow pump dredge (right) The suction dredging pumps will have sufficient capacity to handle the volume of sand over the distances required from the borrow areas to the area of beach requiring nourishment. Typically, the suction dredging pumps are deployed from an A-frame mounted on a barge with anchor spread and deck equipment to run the dredge pumps, anchors and amenities, etc., on the barge. A tug Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs would be used to assist movement of the barge on site and during mobilisation and demobilisation. Dredging using suction pumps have advantages over other sand dredging methods such as cutter suction dredging, including: Sand dredging pumps such Pneuma and Dragflow do not create any turbidity They pump sand at far higher concentrations of solids than cutter suction dredging, meaning there is a lot less water to handle at the disposal end Sand suction pump dredgers are far easier to set up and less costly to run, to mobilise to demobilise Generally, sand suction pumps operate with compressed air, so they do not use as much fuel or energy in the dredging process. Dredging and Beach Nourishment Methodology The dredging methodology using the suction pumps would be “hole “dredging. Hole dredging is based on a hole being dredged to the required depth on a pre-determined grid that covers the borrow area. The grid size depends on the depth of hole required and the properties of the sand. It may be that for greater depths more than one pass over the area may be required. Using the hole dredging method side slopes would be achieved by adopting holes on grid locations and depths to make a box cut to form a stable slope. Hydrograpic survey would be used to confirm that the lines, levels and slopes as designed are achieved. Delivery of sand from the dredge to the beach would be via an (HDPE) pipeline submerged from near the barge to the beach avoiding possible interference to boating and other beach and water users. From a point at the beach where the submerged pipeline ends a manifold would be installed to allow pipelines along the beach to branch off to deliver sand to the beach moving from one end of the beach to the other end creating the beach profile required. The outlet pipes would be moved across the beach and along the beach with sand being moved by a combination of swamp dozers and front end loaders away from the outlet of the pipes delivering sand and pushing sand as required to achieve the lines and levels to form the required design beach profile Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Figure 38. Typical Beach Nourishment Methodology Nearshore Dredged Configuration For the nearshore dredged configuration sand overlying rock to be used for beach nourishment would be dredged using the equipment and methodology described above. Once all the sand is removed from the area a backhoe dredger (BHD) would be mobilised to dredge rock material that underlies the sand to dredge the nearshore configuration to the required depth. A large and powerful BHD would be required to dredge the hardpan material to the design lines and levels required. The BHD spread would include the dredge, attendant tug, hopper barge and sweep bar unit to be used, towed by the tug. The nearshore configuration (trench) is an area of 700 x 110 m and the rock would be dredged by the BHD in four longitudinal cuts of approx 30 m width working each cut from one end to the other (0-660 m). Two to three passes on each cut would be required to dredge in rock to the depths required. The number of passes and depth of cut on each pass would depend on the rock profile and rock geotechnical properties. Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Figure 39. Typical BHD to dredge Calcarenite hardpan in the nearshore configuration All dredged rock would be disposed of in the designated area to the seaward side of the trench. The bulked dredged material would be dumped in this area and would create a raising of the seabed there by around 3 m. Rock material dredged would be placed in this area by two main methods, namely: a) Side casting directly by the BHD on the area adjacent to the seaward side of the trench. This would be possible only for the cut(s) nearest the seaward side of the trench. Rock placed would be moved and spread away from the trench using the tug and sweep bar b) BHD loading a hopper barge and the barge dumping the material directly in the designated area with the tug and sweep bar then moving and levelling the dumped rock to maintain the material to the required lines and levels c) The BHD would be required from time to time to assist the sweep bar to keep the material to the lines and levels required and to shape batters on the boundaries of the area. Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs Pricing of Dredging Works The rates and prices provided for dredging works are given in Table 9. Table 9. Unit Rates for Dredging Works ITEM Rate Site Establishment/dis-establishment $370,000 Dredge sand & place sand on beach $10/m3 Dredge hardpan, side-cast and sweep to levels $25/m3 The rates and prices provided for dredging works in Table 9 are based on the dredging equipment and methodology described above. The rates and prices have been verified with competent local dredging contractors experienced at operating this type of dredging equipment and performing the dredging and beach nourishment/disposal works. These contractors are locally available and can offer more competitive rates than would apply if the works were carried out by major (non- local) dredging contractors. Department of Environment, Land, Water and Planning Portsea Front Beach Options Assessment Appendix A: Concept Designs THIS PAGE KEPT BLANK Department of Environment, Land, Water and Planning Portsea Front Beach Remediation Long Term Options Assessment Appendix B: Modelling Department of Environment, Land, Water and Planning Portsea Front Beach Remediation Long Term Options Assessment THIS PAGE LEFT BLANK Advisian 49 Department of Environment, Land, Water and Planning Portsea Front Beach Remediation Appendix B: Wave Transformation and Sediment Transport Modelling Disclaimer This report has been prepared on behalf of and for the exclusive use of Department of Environment, Land, Water and Planning, and is subject to and issued in accordance with the agreement between Department of Environment, Land, Water and Planning and Advisian.
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