Hurricane Harvey: Texas Coastal Erosion Hot Spot Analysis
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1 Hurricane Harvey: Texas Coastal Erosion Hot Spot Analysis Texas ASBPA Symposium April 24, 2018 Alan Johnson, FEMA Chris Levitz, Compass
2 Agenda Introduction Hurricane Harvey Erosion Hot Spot Analysis Purpose Study Area Technical Analysis Considerations Texas Shoreline Characteristics Historical Shoreline Trends Harvey-Induced Erosion Assessment Methodology Aerial Imagery Assessment Shoreline Topographic Analysis Coastal Model Review Erosion Hot Spot Assessment Results 2
3 Agenda Introduction Hurricane Harvey Erosion Hot Spot Analysis Purpose Study Area 3
4 Hurricane Harvey 4
5 Hurricane Harvey 5
6 Erosion Hot Spot Analysis Purpose Review most current coastal hazard analysis data Locate areas potentially altered by erosion from Hurricane Harvey Evaluate extent of impacts relative to coastal flood risk for communities Define what a coastal erosion hot spot is relative to this analysis For purposes of this study, an erosion hot spot is a location where erosional changes resulting from Hurricane Harvey could lead to an increased coastal risk of a given community 6
7 Study Area 7
8 Study Area 8
9 Study Area 9
10 Agenda Technical Analysis Considerations Texas Shoreline Characteristics Historical Shoreline Trends 10
11 Texas Shoreline Characteristics 11
12 Texas Shoreline Characteristics Bay Shoreline Inlets Barrier Islands & Peninsulas Mainland 12
13 Historical Shoreline Trends Historical Shoreline Advance (BEG) 13
14 Historical Shoreline Trends Historical Shoreline Retreat (BEG) 14
15 Agenda Harvey-Induced Erosion Assessment Methodology Aerial Imagery Assessment Shoreline Topographic Analysis Coastal Model Review 15
16 Aerial Imagery Assessment Imagery Post-Harvey Satellite Post-Harvey Oblique Imagery 16
17 Aerial Imagery Assessment 17
18 Aerial Imagery Assessment 18
19 Aerial Imagery Assessment Oblique Imagery of San Jose Island Post-Harvey 19
20 Aerial Imagery Assessment Oblique Imagery of Surfside Post-Harvey 20
21 Shoreline Topographic Analysis LiDAR Data Pre-Storm Mosaic Post-Storm BEG/GLO Data 21
22 Shoreline Topographic Analysis Pre- and post-ground profiles Comparison grid Quantify erosion 22
23 Coastal Model Review Assessing potential impacts Wave model only (WHAFIS) 23
24 Agenda Erosion Hot Spot Assessment Results Reminder: For purposes of this study, an erosion hot spot is a location where erosional changes resulting from Hurricane Harvey could lead to an increased coastal risk of a given community 24
25 Erosion Hot Spot Assessment Results 25
26 Erosion Hot Spot Assessment Results Southern San Jose Island was identified as an erosion hot spot because it has the potential to increase mainland shoreline coastal flood risk for unincorporated portions of Aransas County San Jose and Matagorda Islands were calculated to have lost approximately 11.5 million cubic yards of sediment, which while not defined as a erosion hot spot due to a lack of impact to a community s coastal flood risk, was still deemed significant based on magnitude 26
27 Erosion Hot Spot Assessment Results Sargent and Surfside Beaches were identified as erosion hot spot with significant shoreline retreat exposing local development Portions of the measured erosion occurred prior to Harvey s impacts, but it was apparent the erosion was exacerbated during the storm and the communities have the potential to experience increased coastal flood risk in post-harvey condition 27
28 Erosion Hot Spot Assessment Results 28
29 Erosion Hot Spot Assessment Results 29
30 Erosion Hot Spot Assessment Results 30
31 Erosion Hot Spot Assessment Results 31
32 Erosion Hot Spot Assessment Results 32
33 Questions? 33
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