Suárez Narváez, Gustavo A.

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    Coeficientes de exportación de sedimentos para la cuenca del Río Grande de Arecibo
    (2005) Suárez Narváez, Gustavo A.; Pérez Alegría, Luís R.; College of Engineering; Rivera Santos, Jorge; Zapata López, Raúl E.; Department of Civil Engineering; Sotomayor Ramírez, David
    This work was developed for the Río Grande de Arecibo watershed in the central part of Puerto Rico. The principal objective was to determine sediment export coefficients for different subwatersheds and land uses using hydrological model simulation with HSPF (Hydrological Simulation Program-Fortran) computer program developed by the USEPA. A global sensitivity analysis was used to calibrate and validate HSPF parameters that controls flow and sediment transport. The analysis identified 𝘒𝘎𝘌𝘙 and 𝘒𝘚𝘈𝘕𝘋 as the most sensitive parameters sediment transport. Calculated sediment export coefficients for agricultural lands for the research period ranged from 0.12 to 0.55 tons/acre/yr. For barren land sediment export coefficient ranged from 0.33 to 14 tons/acre/yr; for forest land ranged from 0.003 to 0.019 tons/acre/yr; for rangeland ranged from 0.009 to 0.022 tons/ac/yr and for pasture was from 0.015 to 0.063 tons/acre/yr. For the simulation period between October 1, 1995 and February 29, 2000 in Caonillas Lake the model accounted 10.7 E06 tons of sediments, which represents a 9.5% difference of the sediments accumulated in the lake as reported by a USGS study. The simulation period for Dos Bocas Lake, between October 1, 1995 and September 30, 1999 the model accounted for 17.6 E06 tons of sediments that represent a 20.1% difference when compared to the USGS measured value. The sediment export coefficient values for agricultural lands were within the tolerance limits suggested for similar soils in Puerto Rico.