Journal
REMOTE SENSING
Volume 7, Issue 10, Pages 13466-13484Publisher
MDPI AG
DOI: 10.3390/rs71013466
Keywords
MODIS; in situ topographic data; water level; spatiotemporal variation; Poyang Lake
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Funding
- State Key Program of National Natural Science of China [41430855]
- National Natural Science Foundation of China [41401506]
- Natural Science Foundation of Jiangsu Province, China [BK20131056]
- 973 Program of the National Basic Research Program of China [2012CB417003]
- Key Program of Nanjing Institute of Geography and Limnology of the Chinese Academy of Sciences [NIGLAS2012135001]
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Lake level variation is an important hydrological indicator of water balance, biodiversity and climate change in drainage basins. This paper illustrates the use of moderate-resolution imaging spectroadiometer (MODIS) data to characterize complex water level variation in Poyang Lake, the largest freshwater lake in China. MODIS data were used in conjunction with in situ topographic data, otherwise known as the land-water contact method, to investigate the potential of this hybrid water level spatiotemporal variability measurement technique. An error analysis was conducted to assess the derived water level relative to gauge data. Validation results demonstrated that the land-water contact method can satisfactorily capture spatial patterns and seasonal variations in water level fluctuations. The correlation coefficient ranged from 0.684 to 0.835, the root-mean-square-error from 0.79 m-1.09 m, and the mean absolute bias error from 0.65 m to 0.86 m for five main gauge stations surrounding the lake. Additionally, seasonal and interannual variations in the lake's water level were revealed in the MODIS-based results. These results indicate that the land-water contact method has the potential to be applied in mapping water level changes in Poyang Lake. This study not only provides a foundation for basic hydrological and ecological studies, but is also valuable for the conservation and management of water resources over gauge-sparse regions in Poyang Lake.
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