HAWAII REGIONAL SEDIMENT MANAGEMENT

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1 HAWAII REGIONAL SEDIMENT MANAGEMENT KAUAI Workshop January 20, 2011 Kauai Veteran s Center Kihei, HI of Engineers, Honolulu District

2 AGENDA Welcome and Introductions Conger Conant Regional Sediment Management Overview Smith Kauai RSM Waves Climate Shoreline Change Offshore Sand Sources Region Sediment Budget Regional Sediment Management Plan Podoski Miller-Owens Miller-Owens Sloop Sloop Break Poipu Region: Potential RSM Projects Sloop Federal Perspective State Perspective General Discussion Smith Conger All Break Kekaha Region: Potential RSM Projects Sloop Federal Perspective State Perspective General Discussion Podoski Conger All Wrap-up and Adjourn Conger Conant of Engineers, Honolulu District

3 REGIONAL SEDIMENT MANAGEMENT OVERVIEW Thomas D. Smith, P.E. Honolulu District of Engineers, Honolulu District

4 NATIONAL REGIONAL SEDIMENT MANAGEMENT PROGRAM of Engineers, Honolulu District

5 REGIONAL SEDIMENT MANAGEMENT An integrated approach that takes a holistic view of coastal, estuary, and river sediments on a regional scale in the planning and maintenance of water resource projects to achieve balanced and sustainable systems. of Engineers, Honolulu District

6 NATIONAL RSM PROGRAM Upper & Mouth of Columbia River Southern California Southeast Oahu, Hawaii Southeast Lake Michigan Northern Gulf Texas Coast New York New Jersey South Atlantic Division NE, SW Central Florida 24 June 2010 of Engineers, Honolulu District

7 SOUTHEAST OAHU RSM of Engineers, Honolulu District

8 SOUTHEAST OAHU RSM REGIONS O A H U Mokapu Point Mokapu Point to Makapu u Point Pearl Harbor State of Hawaii Diamond Department Head of Land and Natural Resources to Pearl Harbor Honolulu Diamond Head of Engineers, Honolulu District Makapu'u Point

9 FINAL PRODUCTS Regional Sediment Budget Historical Shoreline Change Regional Sediment Management Plan Modeling Results Potential RSM Projects GIS Platform of Engineers, Honolulu District

10 MOKAPU POINT TO MAKAPUU POINT of Engineers, Honolulu District

11 Southeast Oahu RSM Location: Mokapu Point to the north through Makapuu Point to the south. Purpose: Optimize use of sediment resources. Issues: Complex sediment transport pathways. Large percentage of critically eroded shorelines. Large percentage of armored shorelines. Economical sand sources yet to be identified. Goal: Increase understanding of littoral processes with the goal of preserving and restoring beaches in the region with potential application elsewhere. of Engineers, Honolulu District

12 MAKAPUU BEACH September 2005 January 2008 of Engineers, Honolulu District

13 OFFSHORE SAND SOURCE INVESTIGATION of Engineers, Honolulu District

14 KAILUA BAY October 15, 2009 US Army ASBPA Corps National of Engineers, Conference Honolulu District 14

15 OFFSHORE SAND NORTH BELLOWS & SOUTH LANIKAI October 15, 2009 US Army ASBPA Corps National of Engineers, Conference Honolulu District 15

16 WAILEA POINT SEDIMENT TREND ANALYSIS of Engineers, Honolulu District

17 WAILEA POINT S.T.A. ANALYSIS Sediment becomes better sorted in the direction of transport. Preferential Transport = Better Sorting Direction of Net Transport Lag Deposit of Engineers, Honolulu District Lead Deposit

18 Gao-Collins Method Results Gao and Collins (1992) of Engineers, Honolulu District

19 Roux Method Results Roux (1994) of Engineers, Honolulu District

20 Combine Results Northward transport Indicates Lanikai has historically received sand from Bellows Beach. of Engineers, Honolulu District

21 WAILEA POINT S.T.A. ANALYSIS METHODOLOGY Historical Analysis DELPH3D Modeling Sediment Trend Analysis RESULTS 1950s: Bellows acts as a source for accretion in South Lanikai 1970s: Revetments stabilize Bellows > South Lanikai erodes 1970-Present: Lanikai net transport to north without replenishment of Engineers, Honolulu District

22 REGIONAL SEDIMENT BUDGET of Engineers, Honolulu District

23 of Engineers, Honolulu District

24 STWAVE SAVE POINTS Mokapu Point 2 1 Wave Buoy: 1234 unique wave conditions Wailea Point nearshore conditions saved at 10 points to create nearshore time series lookup tables. co-sponsored Makapu u by: Point October 15, 2009 US Army ASBPA Corps National of Engineers, Conference Honolulu District 24 10

25 of Engineers, Honolulu District

26 October 15, 2009 US Army ASBPA Corps National of Engineers, Conference Honolulu District 26

27 8 9 October 15, 2009 US Army ASBPA Corps National of Engineers, Conference Honolulu District 27

28 Potential RSM Projects Ka`elepulu Stream Bellows Air Force Station Kaupo & Kaiona Beaches Lanikai Beach of Engineers, Honolulu District

29 KA`ELEPULU STREAM Dune Erosion Downdrift Stream Plugged with Sand of Engineers, Honolulu District

30 BELLOWS AIR FORCE STATION Narrow Hardened Beach to North Wide Beach to the South of Engineers, Honolulu District

31 KAUPO & KAIONA BEACHES Problem Area Problem Area Kaiona Beach Kaupo Beach of Engineers, Honolulu District

32 LANIKAI BEACH Lanikai Beach Looking North Lanikai Beach Looking South of Engineers, Honolulu District

33 LANIKAI BEACH RESTORATION PILOT PROJECT of Engineers, Honolulu District

34 LANIKAI BEACH RESTORATION PILOT PROJECT of Engineers, Honolulu District

35 LANIKAI BEACH RESTORATION PILOT PROJECT of Engineers, Honolulu District

36 of Engineers, Honolulu District

37 of Engineers, Honolulu District

38 THANK YOU of Engineers, Honolulu District

39 MAUI REGIONAL SEDIMENT MANAGEMENT FY10 FINDINGS of Engineers, Honolulu District

40 MAUI REGIONAL SEDIMENT MANAGEMENT WAVE CLIMATE of Engineers, Honolulu District

41 MAUI REGIONAL SEDIMENT MANAGEMENT SHORELINE CHANGE of Engineers, Honolulu District

42 MAUI REGIONAL SEDIMENT MANAGEMENT OFFSHORE SAND SOURCES of Engineers, Honolulu District

43 MAUI REGIONAL SEDIMENT MANAGEMENT REGIONAL SEDIMENT BUDGET of Engineers, Honolulu District

44 MAUI REGIONAL SEDIMENT MANAGEMENT KAUAI RSM PLAN of Engineers, Honolulu District

45 MAUI REGIONAL SEDIMENT MANAGEMENT POTENTIAL RSM PROJECTS POIPU of Engineers, Honolulu District

46 MAUI REGIONAL SEDIMENT MANAGEMENT POTENTIAL RSM PROJECTS KEKAHA of Engineers, Honolulu District

47 THANK YOU of Engineers, Honolulu District

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