Science Service System

Summary of Proposal LAN3344

TitleSeasonal Landslide Flow Rate Fluctuations on the Palos Verdes Peninsula in Southern California
Investigator Madson, Austin - University of California - Los Angeles, Geography
Team Member
Principal Scientist Fielding, Eric - Jet Propulsion Laboratory, Caltech, Earth Sciences
Professor Sheng, Yongwei - University of 
California - Los Angeles, Geography
Assistant Professor Cavanaugh, Kyle - University of 
California - Los Angeles, Geography
SummaryThe modeling and prediction of landslide slope movements requires well-constrained displacement rates derived from robust datasets. Due to the spatial extent of the Portuguese Bend Landslide (PBL), it is not possible to fully constrain the kinematics of the slope movements solely with GPS point data products -- Especially when the GPS campaigns themselves are not continuous and are only undertaken a few times a year (Such is the case here for the GPS campaigns at the PBL). This study seeks to fully constrain those slope movements using the robust archive of TSX data over the study area. The spatial resolution, fast repeat time, wavelength of the sensor, and the amount of data products in the archive over the study area all provide for this unique opportunity to satisfy our main goal of fully constraining the kinematics of the PBL. Secondary to the primary objective, we seek to determine the effects that the recent and ongoing drought has had on the slope movements. We also seek to determine how the local precipitation rates, dewatering rates, and groundwater levels affect kinematics of the landslide complex. Finally, we aim to determine if there are connections between the slope movements and the health of the nearby kelp forests (as could be caused by the sediment fluxes into the adjacent bay from the landslide toe slumping onto the beach and the subsequent beach erosion). In order to satisfy these goals we have laid out the data requirements in the “Specific Requirements” section. We expect to create the following deliverables from the utilization of the TSX data and subsequent secondary datasets; (1) the average slope movement rates for the entirety of the study area as derived from the entire requested TSX data collection from DInSAR and pixel offset processing techniques, (2) the average seasonal slope movement rates, (3) the rate changes (if any) as caused by the ongoing California drought, (4) the connections between precipitation, dewatering rates, and groundwater on the slope movements, (5) the connections between the slope movement rates and the quantity of sediment added to the adjacent beach, and (6) the connection (if any) between sediment fluxes caused by the landslide and overall health of the adjacent kelp forest. There is no specific funding for the requested TSX data products as they are in the archive and are older than the required 18 month period. However, funding for the completion of this project is currently provided by the UCLA Department of Geography as well as the UCLA Graduate Division.

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