| description:
|
These zones represent cliff and dune (sandy shore) erosion hazard zones. The cliff-backed sections incorporate site-specific historic trends in erosion, additional erosion caused by accelerating sea level rise, and (in the case of the “erosion hazard zones with buffer”) an additional buffer corresponding to two standard deviations from the distribution of erosion rates alongshore was added on top of long term erosion distances. , The dune-backed (sandy) sections incorporate site-specific historic trends in erosion, additional erosion caused by accelerating sea level rise, and (in the case of the “storm erosion hazard zones”) the potential erosion impact of a large storm wave event.The inland extent of the hazard zones represent projections of the potential future cliff or sandy shore edge for a given sea level rise scenario, planning horizon, and erosion scenario. Not all areas within the hazard zone are expected to erode to this extent by the specified planning horizon, but any location has the potential to erode to this extent for the selected scenario. This feature is one in a series of coastal flood and erosion hazard zones developed as part of the Los Angeles County Coastal Hazard Modeling and Vulnerability Assessment. For detailed documentation about how these hazard zones were developed, please see "Los Angeles County Coastal Hazard Modeling and Vulnerability Assessment: Technical Methods Report," a report prepared by ESA for The County of Los Angeles in September 2016.-------------------------------The name of this shapefile reflects the future scenarios and planning horizon that the hazard zone represents, as follows:"coastal_erosion_hz" + _ + erosion projection type +_+ sea level rise scenario + planning horizon-------------------------------Erosion projection type:longterm- A continuation of historic erosion with additional erosion caused by sea level rise. Does not include potential impacts of a large storm or uncertainty in erosion events.event - Includes long-term erosion and the locally determined uncertainty: 2 standard deviations from the distribution of erosion rates along the shoreline for cliff-backed sections and the erosion caused by a large (100-year) storm event for the dune-backed (sandy) sections.-------------------------------Sea level rise scenarios:ec – Existing conditions (2010 water level)s2 – Medium sea level rise (93 cm by 2100)s3 – High sea level rise (167 cm by 2100)s4 - Extreme sea level rise (167 cm by 2080)-------------------------------Planning horizons:2010 (Existing conditions)203020502080 (Only for Extreme SLR)2100 |