Assessment of Landuse change on water quality

Authors: Maryam Arif*, University of South Florida, Barnali Dixon, University of South Florida
Topics: Environmental Science, Geographic Information Science and Systems
Keywords: Landuse change, Water quality, SWAT
Session Type: Poster
Day: 4/11/2018
Start / End Time: 3:20 PM / 5:00 PM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

Landuse change is one of the key factors impacting water quality and runoff. This study assessed the impacts of landuse change on water quality and discharge for Alafia river and Hillsborough river, Florida at HUC8 level using Soil and Water Assessment Tool (SWAT). These watersheds were chosen because of their increased urbanization trends. Overall goal of this project included the use of SWAT with historic (1999 and 2008) and futuristic landuse data to predict discharge and water quality data for the study watersheds. SWAT model predicted results were then compared to observed historical water quality (EPA-STORET), discharge (USGS) and rainfall data (NOAA weather stations). Preliminary results show that SWAT predicted discharge data for Alafia closely followed observed trend of discharge data in months March-June for year 1999 while for year 2008, it followed trend for Jan-April. In case of Hillsborough River, SWAT closely followed observed trend for discharge from months April-May for year 1999 while for year 2008 it followed for the months of Jan-April. Urbanization for Alafia River increased from 51.16% to 57.52%, when annual average Total Suspended Solids (TSS) data was analyzed, 1999 showed 7.27 mg/L (average rainfall 3.52mm, discharge 5.47cms) and 2008 showed 6.33mg/L (average rainfall 4.26mm, discharge 4.33cms). Hillsborough River showed similar trend in urban growth of increased urbanization from 28.42% to 37.11%, while annual average TSS concentration for 1999 was 5.36 mg/L (annual average rainfall 2.86mm, discharge 0.70cms) and 2008 showed 4.63 mg/L (annual average rainfall 3.65mm, discharge 1.94cms). SWAT results will require further calibration.

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