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Hydrology of the Pastaza Basin

Hydrology of the Pastaza Basin. An Oil Spill Risk Assessment In the Peruvian Amazon by Anne Mariah Tapp. Study Area. Northern Peruvian Oil Pipeline Constructed 1974 and not maintained Transports 5400 m 3 /day of heavy crude oil. Project Goal- Use ArcGIS and ArcHydro to determine :

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Hydrology of the Pastaza Basin

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  1. Hydrology of the Pastaza Basin An Oil Spill Risk Assessment In the Peruvian Amazon by Anne Mariah Tapp

  2. Study Area

  3. Northern Peruvian Oil Pipeline Constructed 1974 and not maintainedTransports 5400 m3/day of heavy crude oil • Project Goal- Use ArcGIS and ArcHydro to determine : • The areas potentially impacted by a break in the pipeline • The travel time of the oil to the impacted locations

  4. Source Data-WaterGAP Model • Rainfall-Runoff Model • Stream Network and Catchments Delineated Worldwide from 30m resolution DEMs • .5° Resolution • Assumes velocity of 1 m/s for ALL water-bodies • Provides discharge data (m3/s) for each stream segment.

  5. Waterbodies in the Pastaza Basin Whitewater River- Pastaza Blackwater Tributary-Huasaga

  6. Comparison of Stream ProfilesMain Pastaza Channel and Tributaries Range of velocities for points along the main Pastaza 2.4 to 0.6 (m/s) Range of velocities (m/s) for measured tributaries -1.3 to 0.6 (m/s)

  7. Comparison of Discharge Calculated by Different Methods

  8. Methods • Calculate total stream length from pipeline • Assume oil flows with water • Create geometric network and set flow direction • Trace downstream from potential break sites • Calculate travel time (days) by dividing velocity (meters/day) by length (meters).

  9. Remaining Work • Evaluate behavior of heavy crude oil • Possibility of Evaporation and Precipitation • Tailor model to reflect this behavior • Currently model assumes travel with water. • An inaccurate method of modeling oil • However, provides a basic risk assessment.

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