DBPapers
DOI: 10.5593/SGEM2016/B31/S12.104

USING SWAT MODEL AND PROBA-V MULTISPECTRAL DATA TO ASSESS WATER QUALITY IN CALMATUI RIVER BASIN, ROMANIA

D. Dunea, S. Iordache
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-61-2 / ISSN 1314-2704, June 28 - July 6, 2016, Book3 Vol. 1, 797-804 pp

ABSTRACT
The main aim of the research is to optimize the prediction of agricultural contaminants’ movement and their relationship to real conditions at river basin scale for various time intervals using the numerical modeling of the cumulative impact of pollution sources (point and diffuse types) and the processing of satellite images. The paper presents the radiometric indicators extracted from historical databases with multispectral images that allowed the spatiotemporal characterization of land use/ land cover use (2013-2015) i.e. average and low geometric resolution (LR) of PROBA-V satellite (allowing specific characterization of NDVI), which provided canopy and surface reflectance in the pilot area i.e. Călmăţui River Basin. Resulted data were overlapped on the GIS thematic layers (e.g. Corine Land Cover 2006) of the pilot catchment area to develop an integrated system of contaminant movement prediction. These steps were performed for the accurate definition of Hydrological Response Units that included unique combinations between slope, soil type, and land use. All thematic layers were referenced to the same coordinate system using local 1970 stereographic projection and Dealul Piscului 1970 geographic coordinate system. The meteorological inputs used in SWAT included rainfall, maximum and minimum temperature, solar radiation, relative humidity and wind speed for current and subsequent periods (last 10 years) for tests running. In situ measurements and water samplings i.e. BOD, COD, various forms of nitrogen or phosphorus were performed between 2010-2014 in two control sections (Ciresu, and Bertestii de Jos) to check/calibrate the modeling accuracy (using MAE, RMSE and Nash-Suttclife indicators). In situ monitoring results provided the following concentrations for multi-annual medians: 21 mg/l total suspended solids, 0.078 mg/l N N-NH4+, 0.005 mg/l N N-NO2-, 0.296 mg/l N N-NO2-, 0.216 mg/l P total, and 21.82 mg O2 BOD.

Keywords: water quality monitoring, PROBA-V, phosphorous, SWAT model, environmental modeling