Geomorphic and Sedimentation Investigation of the 15 June 1991 Eruption of Mount Pinatubo, the Philippines
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
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This investigation provides a geomorphic framework and sedimentation analysis for five basins affected by the catastrophic eruption of Mount Pinatubo, The Philippines, on 15 June 1991. Medium- to fine-grained pyroclastic- flow material of approximately 5.6 billion cubic meters was deposited in the upper watershed areas around Mount Pinatubo. Rainfall-runoff has rapidly eroded eruption material, causing lahars that have flooded low-lying areas. Flooding and sedimentation from Mount Pinatubo lahars have displaced tens of thousands of people from their homes, destroyed bridges and crops, and decreased the amount of land available to agriculture in the lower basin. The purpose of this analysis is to assess the future sedimentation hazards due to continuing erosion of the 1991 pyroclastic deposits around Mount Pinatubo. A sediment yield forecast is presented for each basin containing large amounts of pyroclastic material. The areas most likely to experience sediment deposition were also identified. That information is used throughout this report to determine future damages, plan and design sediment control measures, and to assess the potential benefits economic and physical for those control measures. Geomorphology, Secondary pyroclastic flows, Mud flows, Sedimentation, Pyroclastic flows, Volcanic eruption.
- Agricultural Engineering
- Geology, Geochemistry and Mineralogy
- Hydrology, Limnology and Potamology