Authors: Kathleen Vaughn*, University of Texas - Austin
Topics: Geomorphology, Physical Geography
Keywords: sediment, watershed, erosion, runoff, tropics
Session Type: Poster
Start / End Time: 8:00 AM / 9:40 AM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: Download
Sediment yields offer a broad-stroke representation of the geomorphological processes at play within any given watershed. Although they lack detail regarding within-watershed sediment production, transportation, and deposition, sediment yields do reveal vital information. Previous studies have related sediment yields to factors including lithology, topography, climate, and land use. There is an abundance of data regarding sediment yields for larger watersheds globally, but little data exists for watersheds smaller than 150 square kilometers. This study seeks to identify the factors controlling average annual sediment yield rates in sixteen Puerto Rican watersheds ranging in size from 12 to 281 square kilometers. Long-term annual sediment yields, estimated using preexisting data on streamflow and suspended sediment concentrations, will be coupled with spatial data on relief, climate, land use, soils, and lithology. We hypothesize that regression analyses will demonstrate that sediment yield is directly related to the abundance of cropland and highly weathered intrusive igneous rocks, moderate to high relief, and annual average rainfall.