An assessment of chlorophyll-aconcentration spatio-temporal variation using Landsat satellite data, in a small tropical reservoir
| Autor: | Mwazvita T B Sachikonye, Tatenda Dalu, Tamuka Nhiwatiwa, P. William Froneman, Timothy Dube, Bruce Clegg |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Geocarto International. 30:1130-1143 |
| ISSN: | 1752-0762 1010-6049 |
| DOI: | 10.1080/10106049.2015.1027292 |
| Popis: | Traditional approaches to monitoring aquatic systems are often limited by the need for data collection which often is time-consuming, expensive and non-continuous. The aim of the study was to map the spatio-temporal chlorophyll-a concentration changes in Malilangwe Reservoir, Zimbabwe as an indicator of phytoplankton biomass and trophic state when the reservoir was full (year 2000) and at its lowest capacity (year 2011), using readily available Landsat multispectral images. Medium-spatial resolution (30 m) Landsat multispectral Thematic Mapper TM 5 and ETM+ images for May to December 1999–2000 and 2010–2011 were used to derive chlorophyll-a concentrations. In situ measured chlorophyll-a and total suspended solids (TSS) concentrations for 2011 were employed to validate the Landsat chlorophyll-a and TSS estimates. The study results indicate that Landsat-derived chlorophyll-a and TSS estimates were comparable with field measurements. There was a considerable wet vs. dry season differences in total chlorophyl... |
| Databáze: | OpenAIRE |
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