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Heidi Sherman
Works at Ailana Surveying & Geomatics LLC
Attended Michigan Technological University
Lives in Kula, HI, United States
60 followers|243,153 views
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Heidi Sherman
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Discussion  - 
 
9-14-2016
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Heidi Sherman
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The wave fronts bend as they wash over the reef so the Pauwela Buoy data is only approximate for waves once they reach the beach
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Heidi Sherman
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A slice or cross section or profile of Baldwin Beach near salient point and cove at east end. The 3-8-2016 surface is higher but does not extend out as far into ocean as previous winter.
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Heidi Sherman
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Sand volumes relative to average along Baldwin Beach. The thick magenta line is 3-8-2016.
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Heidi Sherman
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From YouTube: Kahana Bay: Erosion Mitigation Through Regional Beach Nourishment
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Heidi Sherman

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Heidi Sherman
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9-3-2016
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Heidi Sherman
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In this figure I tried putting the resultant wave energies (with the x and y components adjusted by number of records - sort of an average energy - if that makes sense for resultants?) next to the volume change figure (adjusted by number of days between surveys). I like having the horizontal axis be distance along the beach and the vertical axis be time, however, I think it makes that wave arrows harder to distinguish from each other.
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Westley Sherman's profile photoHeidi Sherman's profile photo
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Kaanapali Beach had huge seasonal fluctuations since last fall. Because Kaanapali is on the west side it doesn't get the strong NE tradewind waves, but it does get south and west summer swell. Kaanapali also appears to be influenced by fringing reef. It looks like wrapped north west swell moves sand until it reaches the fringing reef and than it is deposited in a huge sand point. It is interesting that some Hawaii beaches have much greater seasonal change than others. Sand availability must matter - maybe both amount of sand in the cell and the beach length. Perhaps if the distribution of sand along the beach in summer or winter is particularly unstable in the next season this will cause more seasonal variation. For example the point of sand at Baldwin forms during NW winter swell behind the nearshore beach rock but is directly in an erosion hot spot during summer NE trade wind waves. The point of sand that forms at Kaanapali during the winter may be particularly unstable once the south summer swell arrives. Also at Baldwin the summer profile at the west end is relatively low and wide so that it is susceptible to erosion when it is over topped by large waves. 
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Heidi Sherman
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Monthly wave energy resultants from Pauwela Buoy (CDIP). Arrows point in direction of wave travel. Longer arrows indicate higher wave energies. El Nino caused large NW swells in January and February 2016.
The large swells resulted in dune erosion, trees falling over, and sand washing over into the pavilion, parking area and vegetated areas as the beach tried to migrate landward.
However, the 3-8-2016 sand volumes relative to average along the beach are fairly consistent with the previous winter. While the north shore experienced strong on shore NW swells in January and February, there was also a significant component of along shore (east to west) wave energy during the previous spring, end of summer and through late fall
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It sounds like you're getting to the point where you have enough data to understand the basic yearly dynamics of Baldwin Beach erosion. And the El Nino comparison is quite interesting! I wonder if you could publish a short paper on the El Nino effects? Or maybe it would be better to hold out a bit longer and publish a longer paper on the data as a whole?
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Heidi Sherman
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That's a nice way to represent the data. I like it! Perhaps you could even put the wave data up along side it? :)
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The Hololani Resort uses sandbags in January to prevent erosion of its property in Kahana. While 85 percent of Maui’s shorelines have problems with long-term erosion, Kahana is particularly bad, losing more than half a foot a year. Maui County is soliciting bids from consultants for a feasibility study of using sand nourishment as a way to reduce shoreline erosion in Kahana.

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From Maui News
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Education
  • Michigan Technological University
    Geology, 2000 - 2004
  • University of KwaZulu-Natal
    Environmental Geology, 1996 - 1998
  • Bowdoin College
    Geology/Environmental Studies, 1991 - 1995
  • University of Otago
    Geology, 1994 - 1994
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Gender
Female
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Employment
  • Ailana Surveying & Geomatics LLC
    present
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Kula, HI, United States
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