Chlorophyll and suspended sediment mapping to the Caribbean Sea from rivers in the capital city of the Dominican Republic using ALOS AVNIR-2 data |
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Authors: | Yuji Sakuno Esteban R. Miño Satoshi Nakai Hidemi Mutsuda Tetsuji Okuda Wataru Nishijima Rolando Castro Amarillis García Rosanna Peña Marcos Rodríguez G. Conrado Depratt |
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Affiliation: | 1. Department of Transportation and Environmental Systems, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan 2. Institute for Sustainable Sciences and Development, Hiroshima University, Hiroshima, Japan 3. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan 4. Environmental Research and Management Center, Hiroshima University, Hiroshima, Japan 5. Department of Environment, Municipality of Santo Domingo East, Santo Domingo, Dominican Republic 6. Institute of Chemistry, Faculty of Sciences, Santo Domingo Autonomous University, Santo Domingo, Dominican Republic
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Abstract: | This study aims to study the distribution of contaminants in rivers that flow into the Caribbean Sea using chlorophyll-a (Chl-a) and suspended sediment (SS) as markers and ALOS AVNIR-2 satellite sensor data. The Haina River (HN) and Ozama and Isabela Rivers (OZ-IS) that flow through the city of Santo Domingo, the capital of the Dominican Republic, were chosen. First, in situ spectral reflectance/Chl-a and SS datasets obtained from these rivers were acquired in March 2011 (case A: with no rain influence) and June 2011 (case B: with rain influence), and the estimation algorithm of Chl-a and SS using AVNIR-2 data was developed from the datasets. Moreover, the developed algorithm was applied to AVNIR-2 data in November 2010 for case A and August 2010 for case B. Results revealed that for Chl-a and SS estimations under cases A and B conditions, the reflectance ratio of AVNIR-2 band 4 and band 3 (AV4/AV3) and the reflectance of AVNIR-2 band 4 (AV4) were effective. The Chl-a and SS mapping results obtained using AVNIR-2 data corresponded with the field survey results. Finally, an outline of the distribution of contaminants at the mouth of the river that flows into the Caribbean Sea was obtained for both rivers in cases A and B. |
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