OVERVIEW In May 215: TRESBP ENVIRONMENTAL MONITORING SUMMARY MAY 215 36,371 m 3 of sand was pumped to Snapper Rocks East and 5,578 m 3 of sand pumped to Duranbah. There were 2 media articles relating to the project area. Detail is given in Section 3. Wave heights ranged from calm to severe (.5 to 5.5 m) with a severe sea event on the 1 st and 2 nd (up to 5.5 m), and moderate sea events on the 16 th (up to 2. m) and the 23 rd (up to 2.4 m). Wave directions varied from ENE to ESE with storm waves approaching from ENE over 1 st and 2 nd May and then waves approaching mostly from the East to ESE for the rest of the month. 1458 vessel crossings were recorded for the month. (this is about 3% less than the May average). The estimated amount of sand moving north towards the Tweed River Entrance by natural processes was in the order of 57,5 m 3 (this is about 9% of the May average). 1. SAND PUMPING & DREDGING Sand Delivery May 215 Pumped: 41,949 m 3 Dredged: m 3 Total: 41,949 m 3 The number of days sand was pumped this month = 22 Sand Delivery January to May 215 Pumped: 23,861 m 3 Dredged: m 3 Total: 23,861 m 3 Stage II Sand Delivery April 2 to May 215 Pumped: 7,754,244 m 3 Dredged: 2,61,972 m 3 * Total: 9,816,216 m 3 * * This Includes 22,87 m 3 of sand delivered by dredge to Palm Beach between June and September 25
TRESBP ENVIRONMENTAL MONITORING SUMMARY MAY 215 2. INDICATIVE LONGSHORE TRANSPORT The graph below is based on simplified sediment transport modelling and is indicative only. In May 215 the estimated natural sand transport moving North towards the Tweed River entrance was calculated to be in the order of 57,5 m 3. This result is about 9% of the average estimated sand transport quantity of approximately 67, m 3 for the month of May. LETITIA SPIT INDICATIVE LONGSHORE TRANSPORT ASSESSMENT Cumulative Monthly Net Transport 1, 1 Sediment Transport (cub. m), northward positive 75, 5, 25, -25, 5 Significant Wave Heights, Hsig (m.) Cumulative Net Daily (cub.m) Avg May Trans 1995-215 (Litpack Model) Significant Wave Heights, Hsig (m) -5, 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3 31 1 May 215 3. MEDIA COVERAGE Gold Coast Bulletin published a media article on the 16 th reporting that Rainbow Bay, Greenmount and Coolangatta are among top 1 surf breaks as voted by the readers. Gold Coast Bulletin further reported that sand has been pumped from the Tweed since February 21 to prevent erosion on Gold Coast beaches more importantly creating perfect waves. Surfing Life May 215 issue published an article written by Nick Carroll a leading Australian and International surf writer on his memories on Kirra surf and coastal development around Kirra since 1986 to date.
TRESBP ENVIRONMENTAL MONITORING SUMMARY MAY 215 4. TWEED RIVER ENTRANCE CONDITIONS MARINE RESCUE NSW - MONITORING RESULTS Weekends and public holidays Navigation Rating Impassable-----------Good Impassable (1) Difficulty Encountered (2) Some Difficulty Encountered (3) Relatively Good Crossing (4) Good Conditions (5) Boats 1 st 2 nd 3 3 rd 4 th 24 5 th 85 6 th 6 7 th 11 8 th 21 9 th 115 1 th 9 11 th 53 12 th 73 13 th 15 14 th 3 15 th 2 16 th 1 17 th 2 18 th 4 19 th 36 2 th 44 21 st 44 22 nd 53 23 rd 6 24 th 25 th 2 26 th 57 27 th 39 28 th 7 29 th 81 3 th 264 31 st 83 Total 1458 Source: Marine Rescue NSW, Point Danger
TRESBP ENVIRONMENTAL MONITORING SUMMARY MAY 215 Comparison of the Vessels Passing Through the Entrance per month 213/14 compared to 27 (peak crossings) and 1994/95 (prior to entrance improvements) 4, 27 Peak Average crossings per month 2,56 3,5 212-13 Average crossings per month 1,65 No. Vessels passing through entrance per month 3, 2,5 2, 1,5 1, 5 214-15 Average crossings per month 1,5 vessels passing through the entrance per month (214/15) vessels passing through the entrance per month 1994/5)* Pre Project 1994-95 Average crossings per month 1, * May June July August September October November December January February March April May Month (214-15) *Note 1 - Assuming the number of incoming boats = outgoing boats in 94/95 Siginficant Wave Height (m) measured at the Tweed Waverider Buoy Daily Vessels Passing through Tweed River Entrance and Significant Wave Heights May 215 75% Wave Height Exceedance, ~.9m (1995-21) 5% Wave Height Exceedance, ~1.2m (1995-21) 25% Wave Height Exceedance, ~1.5m (1995-21) Vessels Passing Weekend/Public Holidays Significant Wave Heights, Hsig (m) 7 6 5 4 3 2 1 Days logged in April: 31 Total Crossings recorded: 1458 Average Crossings per day: 47 3 25 2 15 1 5 Daily Vessels Passing Through Entrance
TRESBP ENVIRONMENTAL MONITORING SUMMARY MAY 215 5. WAVE CONDITIONS Wave conditions over the month: Wave heights ranged from calm to severe (.5 to 5.5 m) with a severe sea event on the 1 st and 2 nd (up to 5.5 m), and moderate sea events on the 16 th (up to 2. m) and the 23 rd (up to 2.4 m). Wave directions varied from ENE to ESE with storm waves approaching from ENE over 1 st and 2 nd May and then waves approaching mostly from the East to ESE for the rest of the month. Monthly minimum significant wave height:.5 m on 22 nd May. Monthly maximum significant wave height: 5.5 m on 1 st May. days on which waves were below 1. m: 15 days days on which waves were above 2. m: 4 days Note: Significant wave heights or H sig is the average of the highest one third of recorded waves. (Source: Tweed & Brisbane Wave Buoy; Queensland Government) 8. May 215 Significant Wave Heights, H sig (m) 7. Significant Wave Heights, H sig (m) 6. 5. 4. 3. 2. 1. link to data recorded by the Tweed Waverider Buoy is available at: http://www.qld.gov.au/waves WAVE DIRECTION. 1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16 17 18 19 2 21 22 23 24 25 26 27 28 29 3 31 1 A Source: Queensland Government