A5023911324- Landslides and related hazards
- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Distributed and Parallel Computing Systems
- Computer Graphics and Visualization Techniques
- Tree Root and Stability Studies
- Soil erosion and sediment transport
- Geology and Paleoclimatology Research
- Flood Risk Assessment and Management
- Hydrology and Watershed Management Studies
- Scientific Computing and Data Management
- Data Visualization and Analytics
- Tropical and Extratropical Cyclones Research
- Methane Hydrates and Related Phenomena
- Advanced Vision and Imaging
- Water resources management and optimization
- Water Quality and Resources Studies
- Hydrology and Sediment Transport Processes
- Botany and Geology in Latin America and Caribbean
- Soil and Water Nutrient Dynamics
- Groundwater flow and contamination studies
- Climate change and permafrost
- Groundwater and Isotope Geochemistry
- Geological and Tectonic Studies in Latin America
- Cloud Computing and Resource Management
Lawrence Livermore National Laboratory
2015-2023
St. Cloud Hospital
2022-2023
Argonne National Laboratory
2022
University of Utah
2022
Smithsonian Tropical Research Institute
2016-2021
Smithsonian Institution
2019
University of Oregon
2015-2016
Humboldt State University
2014
United States Geological Survey
2002-2013
RELX Group (Netherlands)
2013
Landslides are triggered by factors such as heavy rainfall, seismic activity, and construction on hillslopes. The leading cause of landslides in Puerto Rico is intense and/or prolonged rainfall. A rainfall threshold for rainfall-triggered landsliding delimited 256 storms that occurred between 1959 1991 the central mountains Rico, where mean annual close to or excess 2,000 mm. Forty one produced resulted tens hundreds landslides. fitted lower boundary field defined landslide-triggering...
the western part of Hurricane Hugo crossed eastern Puerto Rico and Luquillo Experimental Forest (LEF).Storm-facing slopes on northeastern island that were within 15 km eye received greater than 200 mm rain most affected by storm.In LEF nearby area, recurrence intervals associated with 50 yr for wind velocity, 10 to 31 stream discharge, 5 rainfall intensity.To compare magnitudes six hurricanes pass over since 1899, 3 indices developed using standardized values product of: maximum sustained...
Despite their widespread occurrence and often deadly nature, it remains difficult to predict when where landslides are likely occur.
One of the most critical challenges for high-performance computing (HPC) scientific visualization is execution on massively threaded processors. Of many fundamental changes we are seeing in HPC systems, one profound a reliance new processor types optimized bandwidth over latency hiding. Our current production software not designed these architectures. To address this issue, VTK-m framework serves as container algorithms, provides flexible data representation, and simplifies design algorithms...
This paper introduces ALPINE, a flyweight in situ infrastructure. The infrastructure is designed for leading-edge supercomputers, and has support both distributed-memory shared-memory parallelism. It can take advantage of computing power on conventional CPU architectures many-core such as NVIDIA GPUs or the Intel Xeon Phi. Further, it flexible design that supports integration new visualization analysis routines libraries. describes ALPINE's interface choices architecture, also reports...
A spatial data base of 1609 landslides was analysed using a geographic information system to determine landslide frequency in relation highways. 126 km long transportation network 201 km2 area humid-tropical, mountainous, forested terrain Puerto Rico used conjunction with series 20 buffer (disturbance) zones varying from 5 400 m length, measured perpendicular the Average study at distances greater than 85 roads about six per square kilometre. At or less on either side highway, 30 On average,...
Abstract. Rainfall-triggered landslides are part of a natural process hillslope erosion that can result in catastrophic loss life and extensive property damage mountainous, densely populated areas. As global population expansion on or near steep hillslopes continues, the human economic costs associated with will increase. Landslide hazard mitigation strategies generally involve assessment mapping, warning systems, control structures, regional landslide planning policy development. To be...
Coral reefs, the foundation and primary structure of many highly productive diverse tropical marine ecosystems, have been degraded by human activity in much earth's oceans. To contribute to improved understanding this problem, potential relation between river sediment nutrient discharges degradation coral reefs surrounding Puerto Rico was studied using streamflow, suspended-sediment, water-quality data. Mean annual runoff for 8711 km2 island is 911 mm, about 57% mean precipitation (1600 mm)....
Humid tropical regions occupy about a quarter of Earth's land surface, yet they contribute substantially higher fraction the water, solutes, and sediment discharged to world's oceans. Nearly half population lives in tropics, development stresses can potentially harm soil resources, water quality, supply addition increase landslide flood hazards. Owing Puerto Rico's steep topography, low storage capacity, dependence on trade-wind precipitation, island's people, ecosystems, are vulnerable...
The term “in situ processing” has evolved over the last decade to mean both a specific strategy for visualizing and analyzing data an umbrella processing paradigm. resulting confusion makes it difficult visualization analysis scientists communicate with each other their stakeholders. To address this problem, group of 50 experts convened goal standardizing terminology. This paper summarizes findings proposes new terminology describing in systems. An important finding from was that systems are...
Particle advection is one of the foundational algorithms for visualization and analysis central to understanding vector fields common scientific simulations. Achieving efficient performance with large data in a distributed memory setting notoriously difficult. Because its simplicity minimized movement field data, Parallelize over Data (POD) algorithm has become de facto standard. Despite ubiquitous usage, scaling issues POD are known have been described throughout literature. In this paper,...
During the period from 1990 to 1997, annual rainfall accumulation averaged 87% of normal at 12 stations with longest record in Puerto Rico, a Caribbean island 1999 population 3.8 million. Streamflow rivers supplying La Plata and Loíza reservoirs, principal water supply San Juan metropolitan area, was or below 10th flow percentile for 27% 50% time between December 1993 May 1996. Diminished reservoir levels 1994 1995 affected more than 1 million people area. Water rationing implemented during...
Heavy rainfall from the storm of December 14-16, 1999 triggered thousands landslides on steep slopes Sierra de Avila north Caracas, Venezuela. In addition to landslides, heavy caused flooding and massive debris flows that damaged coastal communities in State Vargas along Caribbean Sea. Examination pattern obtained GOES-8 satellite showed damage was generally consistent with area heaviest rainfall. Field observations severely affected drainage basins historical records indicate previous...
Rainfall, slopewash (the erosion of soil particles), surface runoff and fine-litter transport steepland sites in the Luquillo Experimental Forest, Puerto Rico (18° 20' N, 65° 45' W) were measured from 1991 to 1995. Hillslopes underlain by (1) Cretaceous tuffaceous sandstone silstone subtropical rain (tanonuco) forest with vegetation recovering Hurricane Hugo (1989), (2) Tertiary quartz diorite lower mantone wet (colorado dwarf) undisturbed canopy compared recent landslide scars. Monthly on...